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Dissertations / Theses on the topic 'Device for testing differentials'
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Odložilík, Daniel. "Zařízení pro testování diferenciálů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445172.
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This master’s thesis deals with the design of equipment for testing differentials. The aim of the thesis is therefore the design of a special device that will be able to measure the steady and transient characteristics of differentials. Master’s thesis is divided into four chapters. The first chapter points out the disadvantages of fully open and closed differentials, the second deals with a basic overview of the structures and design of self-locking differentials. The third chapter deals with research of existing devices that test and measure the characteristics of differentials. The fourth chapter then discusses the possible drives of the tested unit. The fifth chapter focuses on the actual construction design of the test equipment. The subsequent sixth chapter then solves the strength calculations of the chosen structural elements of this device.
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Muto, Andrew (Andrew Jerome). "Device testing and characterization of thermoelectric nanocomposites." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44915.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 67-68).
It has become evident in recent years that developing clean, sustainable energy technologies will be one of the world's greatest challenges in the 21st century. Thermoelectric materials can potentially make a contribution by increasing energy efficiency of some systems. Thermoelectric materials may play a role in the large scale energy industry, specifically in the applications of refrigeration and waste heat recovery. In this work a novel thermoelectric material will be tested for conversion efficiency. A Bi₂Te₃ nanocomposite has been developed by the joint effort of Prof. Gang Chen's group at MIT and Prof. Zhifeng Ren's group at Boston College. The material exhibits enhanced thermoelectric properties from optimized nanoscale structures and can be easily manufactured in large quantities. In order to better characterize its performance a novel power conversion measurement system has been developed that can measure the conversion efficiency directly. The measurement system design will be described in detail; important design considerations will be addressed such as measuring heat flux, optimizing the load matching condition and reducing electrical contact resistance. Finally the measured efficiency will be compared to the calculated efficiency from a temperature-dependent properties model. It will be shown that a Ni layer must be attached to the nanocomposite to allow soldering and power conversion testing. Results of this work will show that the nanocomposite efficiency is higher than the commercial standard. Electrical contact remains a challenge in realizing the potential efficiency.
by Andrew Muto.
S.M.
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Reid, Richard A. "Triaxial permeability device." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/20036.
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Ottosson, Jan Benjamin. "Development and Evaluation of a Small Punch Testing Device." Thesis, Linköping University, Engineering Materials, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-59285.
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Thong, John Thiam Leong. "Electron beam testing technology for high-speed device characterisation." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316815.
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Hopkins, Rachel. "Design and investigation into a novel aerosol testing device." Thesis, University of Bath, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760821.
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Ennefors, William. "Netconf Device Simulator : Developing a NETCONF based testing platform." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-69999.
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When developing network configuration/orchestration applications, it is often convenient to run automated as well as manual tests towards simulated rather than actual hardware devices. Though there exists software of this type, they rarely contain features that can be convenient for testing purposes. The simulation needs to be lightweight, be able to generate special events, and use the NETCONF RPC protocol. This thesis will explain the decisions that were made while developing a simulation software of this type, it will also explain the underlying functionalities and terms associated with the simulation.
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Lindström, Hannes, and Gustav Marstorp. "Security Testing of an OBD-II Connected IoT Device." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-239367.
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The Internet of Things (IoT) is a rapidly growing network. As society begins to trust the devices in the IoT with increasingly complex tasks, issues regarding the security of these devices are of high priority. An example of an IoT-device in which failure of security could be fatal, is the Telia Sense. Telia Sense is an OBD-II dongle which together with a mobile application connects a car to a smartphone.In this paper, the discoveries that was made during security testing of Telia Sense will be discussed. The system was investigated through a black box perspective. Primarily, a model of the system was produced. Threats were then identified, ranked and tested accordingly.No major vulnerabilities were found. The results all indicated that Telia Sense is a well secured system. The main reasons to this is the fact that the device has very limited functionality and its communications are bounded. Even though no major vulnerabilities were found, this paper can still be used as a guide for future testing of security in IoT devices.
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Fält, Gustav. "Shear strenght test device : Design of a device for testing shear strenght on winter roads." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-78394.
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When buying a new car today customers expect that the safety systems built in the car and its tireswill do its job in every condition. This is especially important when driving on winter roads due to thedecrease in friction between the tire and the road surface. To get further understanding how snowbehaves on winter roads, knowing how the shear strength in the hard-packed snow found on winterroads changes when doing for example multiple brake test in the same tracks can be of greatimportance when designing a new, safer product. This thesis will go through the design process of anew device designed to measure shear strength in winter test tracks. The device consists of anelectric motor powered by 12 or 24 Vdc connected to a worm gear style gearbox and can measureup to 200 Nm of torque
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Rigby, Douglas Bertrand 1956. "Cyclic shear device for interfaces and joints with pore water pressure." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276922.
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An improved multi degree-of-freedom direct shear device has been designed and constructed to test interfaces and joints under pore water pressure. Any two structural (concrete, steel, wood) or geologic (soil, rock) materials may be tested in the device as long as the top specimen is solid. The apparatus is designed to hold a 7.5-inch diameter 3-inch thick upper sample and a 9-inch diameter 3-inch thick lower sample. A normal stress of 400 psi (2.7 MPa) and a shear stress of 550 psi (3.9 MPa) can be developed at the interface. Test loading may be static, quasi-static, or cyclic, and constant or variable stiffness loading is available. A stiff reaction frame was designed to house the device and is described. The electro-hydraulic system is capable of supporting cyclic testing at 30 Hz. A new computer-controlled data acquisition and control system is also described.
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Blue, Erika Elaine. "Validity Testing of a Preschool Reading Screening Device for Pediatricians." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5645.
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Despite efforts to improve access to early literacy intervention in the United States, there are still children entering kindergarten that are not adequately prepared for school and are unlikely to catch up to their peers (National Education Association, 2014). Preschool programs are actively involved in screening their students for potential literacy difficulties; however, there are children who do not attend preschool and may not have their literacy development assessed. One solution to this problem is to involve other individuals who routinely see preschool age children. Pediatricians are one such group as children come to them for their wellness visits and vaccinations. It may be possible to involve them in the reading screening process. To this end, a screening device (Tridas, 2014) has been developed by a developmental pediatrician.
The purpose of this pilot study was to establish the content and criterion validity of this reading screening test (Tridas, 2014). Eight preschool children (ages 55-62 months) completed the reading screener, which had two components: a brief parental questionnaire assessing language abilities and a quick check of phonological awareness. The scores on these two subtests were compared with performances on two standardized measures of language function: the Clinical Evaluation of Language Fundamentals-Preschool -Second Edition (CELF-P2; Semel, Wiig, & Secord, 2004), a measure of global language skill and the Test of Preschool Early Literacy Skills (TOPEL; Lonigan, Wagner, Toregsen, & Rashotte, 2007), a measure of early literacy skills.
Results indicated that the reading screener showed good content and criterion validity. Parental report of language ability was verified by scores on the CELF-P2. The two students with the lowest scores on the CELF-P2 also received the greatest number of parental concerns on the reading screener. Participants evidenced excellent letter identification skills; however, performance on the rhyming tasks identified those with lower standard scores on the TOPEL. The pass/fail decisions on the reading screener were then compared with the standard scores on the TOPEL and the two individuals who failed both portions of the screener also scored the lowest on the TOPEL. Based on this analysis, cut-off scores for the components of the reading screener were identified. Pilot results indicated that this screening device has potential for the identification of children in need of more complete evaluation of literacy skills. Continued evaluation of this screening device is warranted with a broader sample of preschool children and with pediatricians as the examiners.
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Flowers, Susan Caroline. "Design of a laparoscopic simulation device for testing and training." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92177.
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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.Cataloged from PDF version of thesis.
Includes bibliographical references (page 38).
This thesis describes the development by Caroline Flowers of two prototypes of a benchtop laparoscopy simulator that mechanically simulates access ports using outer 'tissue' samples for port insertion and an inner cavity region where ex-vivo organs can be placed and operated on using laparoscopic tools. The alpha prototype was designed for testing tools for an MIT medical device design class, while the beta prototype was designed as a low-cost and more realistic substitute to simulators currently on the market.
by Susan Caroline Flowers.
S.B.
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Krol, Przemyslaw Michal. "Productization and instrumented testing of a corrosion fatigue test device." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111748.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.Cataloged from PDF version of thesis.
Includes bibliographical references (page 79).
Corrosion Fatigue has been identified as the limiting factor of submarine propulsion shaft operation intervals. Increasing the inspection interval from 6 to 12 years could save a significant amount of money on procurement and maintenance costs. Corrosion fatigue data is sparse and incomplete and an initial prototype of a fatigue testing device that more accurately reflects the operational loading of sub shafts was designed in a previous thesis. The U.S. Navy has identified the device as improvement on current testing methods. The primary purpose of the fatigue testing machine has been identified within a long-term testing plan for the Navy. In this work, the key aspects of the design have been updated. The manufacturing, setup, operation, and maintenance of the device have been provided. Instrumentation has been as part of an effort to monitor motor health and to explore the possibility of detecting crack initiation within the test shaft. The test device has been used to collect relevant data provide baseline data on artificially pitted samples and unpitted samples test shafts in seawater for the Navy. Artificial seawater was used for testing consistency. A continued testing regime is recommended and outlined. Last, further design updates and ideas are suggested.
by Przemyslaw Michal Krol.
S.M.
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Kavianpour, Isfahani Zahra. "Statistical Analysis of Stormwater Device Testing Protocols in Portland, Oregon." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/676.
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Stormwater treatment is commonly performed with a combination of approaches including the utilization of natural systems and engineered devices. Before using a proprietary treatment instrument it is required to verify its performance and efficiency in reducing different pollution components including the TSS. Different states have developed strategies and regulations for accepting new instruments. In this thesis the stormwater management plan of the City of Portland, Oregon(2008), is analyzed in order to improve the current regulations. These rules apply to new technologies which are proposed by vendors to be used in Portland's stormwater treatment plans. Each requirement which should be met by the applying vendors is thoroughly analyzed followed by a comparison with the Stormwater management plan(2008)regulations of the state of Washington the so called Technology Assessment Plan-Ecology TAPE (Howie, 2011). Because of the similarities in the climate and land use between these two testing frameworks in order to evaluate the potential applicability of data submitted by vendors who had devices approved by Washington, to be utilized by Portland. The treatment of total suspended solids (TSS) is the focus of this thesis since it is central to the testing process and since most of the other pollutions are attached to TSS and will get treated if TSS is treated. The overall analysis shows that Portland adopts more restrictive requirements on the characterization of stormwater event samples to be treated by a technological instrument while Washington's restriction are more stringent on the efficiency of total suspended solid removal, in which it demands higher standards on the treatment of TSS compared to Portland's efficiency requirements. In order to study practical context in which regulations are administrated by Portland, rainfall data from 66 gauges covering the period of 1980-2011 was studied and the impacts of seasonality, land use, land form, periods of no rain before and after an event and Portland's Modified Performance line on the number of accepted rain events were analyzed. The results which were accepted by state of Washington were also compared with the results accepted by the city of Portland on Portland's Standard Performance line. Our seasonality study suggests that Portland's requirements are unnecessarily restrictive which results in the disqualification of many otherwise useful stormwater events, sometimes allowing no natural events to be available for testing in dry years. The analysis of land use showed that land use has no statistically significant impact on the concentration levels of TSS, thereby indicating that land use restrictions in the testing rules could be usefully relaxed. Decreasing the interevent no-rain period significantly increases the total number of events providing sufficient data to assess the performance of treatment facilities. We also showed that many more events become suitable for performance testing if events separated by one hours or less are considered a single, longer event. Finally we identified a statistical relationship between number of forecasted accepted stormwater events and the total average daily precipitation in a given year.
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Smolarek, Tomasz. "Study of Open Mobile Alliance Device Management sessions for most effective device management." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2944.
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Effective device management is not trivial due to a variety of devices and software. To keep costs to minimum companies must effectively utilize a unified solution for device management. This research investigated Funambol’s implementation of Open Mobile Alliance Device Management (OMA DM) which is the most popular device management solution. Interviews were used to set experiments and create realistic test cases. A set of devices and a collection of Funambol software were used to create device management sessions. All of the sessions were recorded, analysed, manipulated and resent to identify efficient ways of device management. Additionally, an influence of compression and buffer-like mechanisms were checked. Methods and guidelines are provided for efficient use of OMA DM as well as a reliable analysis of OMA DM Sessions under various conditions. It was found that for most data it is best to use a built-in transport protocol compressor. Hypertext Transfer Protocol’s (HTTP) deflate with a combination of client-side buffering-like mechanism at a client side performed best at most cases. Funambol’s implementation of the Binary Extensible Markup Language (WBXML), in most cases, performed very badly, even though it was designed specifically to compress OMA DM Session messages. It was found that for an efficient use of OMA DM a proper software option set (e.g. forced use of compression) may be sufficient.
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Alisauskas, Saulius. "Community based testing." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-124393.
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Currently, Android is the most popular operating system for mobile devices, but at the same time, the market for Android devices is heavily fragmented in terms of available versions, types of devices, models, form-factors and manufactures. As a result, it is virtually impossible to test applications on all existing devices. Testing on a set of the most popular devices is more realistic but can be expensive, which makes it much more difficult for individual developers to create high quality applications. Fortunately, each Android application developer around the world typically owns at least one device which is not used all the time and could be shared with other developers. This way, a community shared pool of Android devices can be created for automated test execution. This master thesis reviews existing testing frameworks that are used for testing Android applications and analyzes existing services that in one way or another try to solve the problem of providing affordable ways of performing testing on real devices. Main result of this thesis project is a working distributed community based testing service that enables developers to easily connect, share, and execute automated test cases on devices that use Android operating system. Moreover, it provides ways of decreasing overall test execution time by executing parts of tests in parallel on multiple devices and aggregating received results.För närvarande är Android det mest populära operativ system för mobila enheter, men samtidigt marknaden för Android-enheter är starkt splittrat i fråga om tillgängliga versioner, typ av enhet, modeller, form-faktorer, och tillverkar. Som ett resultat, är det praktiskt taget omöjligt att testa applikationer på alla befintliga enheter. Testa på en uppsättning av de mest populära produkter är realistiskt men kan vara dyrt, vilket gör det mycket svårare för enskilda utvecklare att skapa högkvalitativa ansökningar. Lyckligtvis äger varje Android ansökan utvecklare i världen typiskt åtminstone en enhet som inte används hela tiden och kan delas med andra utvecklare. På så sätt kan en gemenskap delad pool av Android-enheter skapas för minst automatiserade test exekvering. Detta examensarbete går igenom gällande testning ramverk som används för att testa Android applikationer och analyser liknande tjänster som på ett eller annat sätt försöka lösa problemet med att tillhandahålla prisvärda sätt att utföra tester på riktiga enheter. Huvudsakliga resultat av detta examensarbete är en fungerande distribuerad gemenskap baserad testning tjänst som gör det möjligt för utvecklare att enkelt ansluta, dela och exekvera automatiserade testfall på enheter som använder operativsystemet Android. Dessutom ger det möjligheter att accelerera övergripande testexekvering tid genom att utfö!ra delar om tester parallellt på flera enheter och sammanställa erhållna resultat.
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Scholz, Tamera Lee. "Pneumoniacheck: a device for sampling lower airway aerosols." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/41175.
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The pathogens causing pneumonia are difficult to identify because a high quality specimen from the lower lung is difficult to obtain. A specimen collection device, named the PneumoniaCheck, was previously designed to collect aerosol specimens selectively from the lower lung generated during deep coughing to aid in the diagnosis of specific pathogens causing pneumonia. The device also includes several specially designed features to exclude oral contaminants from the sample, and a filter to collect the aerosolized pathogens. The objective of this thesis is to develop tests to verify the functionality of the device, called the Design Inputs.
Nine verification tests were performed to demonstrate the ability to collect lower airway aerosols separate from upper airway aerosols, successful exclusion of oral contents, and capture of pathogens in the filter. Further, the PneumoniaCheck was tested for proper sampling of the lower airway aerosols during deep cough at a very low volumetric flow rate to simulate patients with severe restrictive lung disease and with mal-positioning to simulate incorrect patient placement.
Verification testing of the PneumoniaCheck demonstrates effective separation of upper airway gas from the lower airway gas (p<0.0001) and exclusion of both liquid and viscous oral material (p<0.0001) from the collection chamber. Testing also demonstrated the selective sampling of the lower airway, even during low volumetric flow rates or incorrect positioning of the device.
The complex shape of the PneumoniaCheck presents a manufacturing challenge. Making the device from a solid and then drilling out the tubes would be difficult because the outer channels do not align with the inner channel. Rapid prototyping, vacuum molding, and injection molding are all manufacturing options. Rapid prototyping is slow, and usually only economic for small numbers of parts. For vacuum molding or injection molding, the PneumoniaCheck would need to be cut in half and molded, and then the halves connected with fasteners, glued, or welded. Vacuum molding is inexpensive, but there would be a lip at the connection that may be uncomfortable for patients. If the lip is on the inside of the device, it may interrupt air flow through the device. Injection molding is inexpensive and fast. The PneumoniaCheck could be injection molded in halves, and then glued or sonically welded together. Injection molding would be an efficient and economical way to manufacture the device.
Verification tests were developed and performed, and the results demonstrate that the PneumoniaCheck successfully collects lower airway aerosols separate from upper airway aerosols, excludes oral contents, and captures pathogens in the filter, even during non-ideal conditions. After considering three different manufacturing options, injection molding was recommended for the device.
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Thompson, Julie Ann. "Design, construction, and validation of a cadaver knee motion testing device." Connect to resource, 2008. http://hdl.handle.net/1811/32034.
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McPherson, Ian Duncan. "An evaluation of the flat dilatometer as an insitu testing device." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25116.
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The results from the use of the dilatometer (Marchetti 1975, 1980) at 4 sites in British Columbia are presented. Comparisons are drawn between the dilatometer and other insitu test devices, including the piezo-friction cone, self-boring and Menard pressuremeters and field vane. Soils tested included saturated deltaic deposits, a sensitive plastic clay and a saturated, hydraulically placed fill.
Overall the dilatometer proved to be an extremely effective device. It had a low capital cost, required a minimum of support equipment and was simple to use. The data was repeatable and easily reduced using a computer programme. Computer output, both graphical and tabular, is easily amenable to interpretation to an engineer in the field.
For the most part the results in this thesis support Marchetti's empirical correlations with the following exceptions:
( i) determination of K0 in sands,
( ii) determination of a deformation modulus in clay,
and
(iii) in overconsolidated silts where it is believed that abnormal pore pressures caused the empirical correlations to breakdown.
The dilatometer is an insitu, total stress, penetration device which cannot be analysed in a fundamental manner. Elastic theory is inapplicable because of plastic straining during blade penetration and probably during membrane expansion. To more critically evaluate the dilatometer, the author designed an electronic research device with exactly the same external dimensions as Marchetti's dilatometer. The aim of the electronic dilatometer is to greatly improve understanding of the simple Marchetti dilatometer by allowing:
( i) a better understanding of the operational characteristics of Marchetti's dilatometer,
( ii) direct measurement of stress on, and deformation of, the membrane,
(iii) measurement of pore water pressure before and after halting penetration and during membrane expansion, and ( iv) measurement of the pushing force on the blade.Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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Ernst, Timothy Craig. "Design, Fabrication and Testing of a Wearable Cooling System." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6851.
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A wearable cooling system was developed in this study for use in elevated temperature environments by military, fire-fighting, chemical-response, and other hazardous duty personnel. Such a system is expected to reduce heat-related stresses, increasing productivity and allowable mission duration, reduce fatigue, and lead to a safer working environment. The cooling system consists of an engine-driven vapor-compression system assembled in a backpack configuration, coupled with a cooling garment containing refrigerant lines worn in close proximity to the skin. A 2.0 L fuel tank in the backpack powers a small-scale engine that runs a compressor modified from the original air compression application to the refrigerant compression application here. A centrifugal clutch and reduction gear train system was designed and fabricated to couple the engine output to the refrigerant compressor and heat rejection fan. The overall cooling system, including the wearable evaporator, had a total mass of 5.31 kg (11.7 lb) and measured 0.318 נ0.273 נ0.152 m (12.5 נ10.75 נ6 inches).
Testing was conducted in a controlled environment to determine system performance over a wide range of expected ambient temperatures (37.7-47.5㩬 evaporator refrigerant temperatures (22.2-26.1㩬 and engine speeds (10,500-13,300 RPM). Heat removal rates of up to 300 W, which is the cooling rate established in the literature as being required for maintaining comfort at an activity level comparable to calisthenics or moderate exercise, were demonstrated at a nominal ambient temperature of 43.3㠨110橮 Modeling the fuel as 88 percent methanol (LHV ~ 1.992ױ07 J/kg) and 12 percent oil, the system consumed 1750 W at an average fuel mass flow rate of 0.316 kg/hr to provide a nominal cooling rate of 178 W for 5.7 hrs between refueling.
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Felix-Angulo, Alejandro. "Characterization and modeling of a magnetic workholding device." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/16500.
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Lee, Hong Aik Chey Hock Sim. "Cross network information sharing for handheld device based distributed system." Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FLee_Sim.pdf.
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Thesis (M.S. in Computer Science)--Naval Postgraduate School, December 2009.Thesis Advisor: Singh, Gurminder. Second Reader: Das, Arijit. "December 2009." Description based on title screen as viewed on January 26, 2010. Author(s) subject terms: TwiddleNet, Mobile Web Server, cross network information sharing. Includes bibliographical references (p. 51). Also available in print.
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Rosen, Matthew(Matthew F. ). "Systems analysis, design, and testing for an agricultural soil compaction sensing device." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122614.
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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, System Design and Management Program, 2019Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2019
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 110-117).
The World Resources Institute (WRI) and United Nations Food and Agriculture Organization (FAO) estimate that global agricultural food production will need to increase 56% between 2010 and 2050 to meet projected caloric demands of the growing population. Given the finite amount of global land area as well as the impacts agricultural land-use and production have on greenhouse gas emissions (GHGs), achieving this increase in consonance with climate change reduction goals presents a formidable challenge. In the past, large yield improvements have been realized from genetically modified seeds, synthetic fertilizers and pesticides, increased mechanization, and improved irrigation, but these innovations have also brought negative side effects. For example, the increasing weight of mechanized farm equipment has led to significant man-made soil compaction.
Soil compaction is the increase in bulk density, or reduction of air pore space, in a soil matrix, and it can lead to restricted root growth, poor water and nutrient infiltration, and reductions in yield. Specifically, man-made compaction has been estimated to lead to 15-20% reductions in crop yield, leading to $40-45 Billion in annual financial losses in the United States alone. Mechanical tillage is one of the most common remedies for loosening compacted soil, but the process damages soil structure and overall soil health, making it a solution that should optimally be used sparingly, only in areas where soil is severely compacted. A key challenge to enabling this, however, is compaction sensing and mapping at the field scale. In response to this challenge, a research project was undertaken through MIT Beaver Works, a collaboration with MIT Lincoln Laboratory, to explore systems-based solutions for real-time soil compaction sensing and mapping.
Through that work, a high-level system design for measuring soil compaction at the field scale was proposed based on electromagnetic sensing, including the use of ground penetrating radar (GPR) and electromagnetic induction (EMI) sensors. This thesis aims to address the highest risk aspects of the proposed approach through modelling, laboratory testing, and field testing, progressing theoretical results into increasingly more realistic settings to better understand practical limitations and potential challenges with the technical approach.
by Matthew Rosen.
S.M. in Engineering and Management
S.M.
S.M.inEngineeringandManagement Massachusetts Institute of Technology, System Design and Management Program
S.M. Massachusetts Institute of Technology, Department of Mechanical Engineering
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Scheuring, Toni. "Implementing Usability Engineering into Development of an Innovative Antibiotic Susceptibility Testing Device." Thesis, Uppsala universitet, Industriell teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-396589.
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During the last decades, newly developed medical devices often came along with unappropriate designs, increasing the likelihood of misuse through the operator. Part of the root cause was that no sufficient measures were applied to assimilate user needs. Consequently, usability engineering approaches are now stronger emphasized to ensure that new devices are not only safe to use but are also designed for users’ needs. Besides, testing processes in clinical microbiology laboratories are currently reshaped due to new generations of rapid testing methods. Hence, it is particularly important to apply usability engineering frameworks during the development phase to make sure devices address users’ needs and also fit into the new work- and communication flows. Based on that, this research project applies a usability engineering approach to the design process of a new rapid antibiotic susceptibility testing system of Astrego Diagnostic AB that is supposed to be used in clinical microbiology laboratories in the near future. The research questions focus on how this device can be designed to enable integration into clinical laboratories. - How can a rapid AST testing system be integrated into the workflow of clinical microbiology laboratories? - What are the remaining uncertainties for integrating a rapid AST system into the workflow of a clinical microbiology laboratory on the example of Astrego’s AST system? Several methods were used to address these questions, which include literature research, a competitive audit, subject matter interviews and semi-structured interviews, and observations of targeted users. The findings show that a rapid antibiotic susceptibility testing system may be used in several different ways, which also impacts its design. Process-wise, it could be used after Gram staining and bacterial identification has been conducted and, more realistically, simultaneously bacterial identification to pave the way for additional time savings further. However, uncertainties remain regarding the design of the new testing system. Depending on the number of devices that targeted laboratories need to implement to accommodate their testing volume, it makes sense to design a built-in user interface or an external one that can be accessed through a tablet or desktop. Thus, it is uncertain to what extent manual input of bacteria ID is relevant as the dRAST system fully enables manual input of Gram type and bacteria IDs while it might also be possible to avoid manual interaction by receiving this information through software interfaces.
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EPPERSON, PATRICK MICHAEL. "APPLICATION AND CHARACTERIZATION OF CHARGE-COUPLED DEVICE ARRAY DETECTORS FOR ANALYTICAL SPECTROSCOPY." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184233.
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The research described in this dissertation is the first evaluation of two-dimensional charge coupled devices (CCDs) for low light level analytical spectroscopy. The electro-optical properties of several unique two-dimensional CCDs are evaluated, including quantum efficiency, detector read noise, linearity, dynamic range, dark current, and blooming. Theoretical models describing the sensitivity and dynamic range of CCDs on a single detector element basis are developed. Based on this model and the characteristics of a CCD detector system built for this research, it is shown that a single detector element of a CCD has comparable or superior sensitivity than the most sensitive single channel detectors. The results of the CCD detector system applied to fluorescence, emission, absorption, and time and spatially resolved spectroscopies are presented. The charge binning readout mode, which combines charge packets from several detector elements into a single charge packet, is critically evaluated for increasing the sensitivity and dynamic range of spectroscopic measurements. Equations describing the sensitivity and dynamic range enhancement achieved through charge binning are derived and experimentally verified in atomic emission and molecular fluorescence spectroscopies. The results of operating the CCD in two specialized readout modes developed in this research termed high-speed framing and spectral framing are presented. High speed framing allows the CCD to rapidly acquire two-dimensional images with high sensitivity. The spectral framing readout mode enables the CCD to record time-resolved spectra at a rate of approximately one spectra every two microseconds with great sensitivity. The design and evaluation of a CCD based molecular fluorescence spectrograph using a mercury pen lamp excitation source is described. The limit of detection for anthracene is 1 x 10 ⁻¹²M and is superior to the results obtained by fluorometers employing laser sources and photomultiplier detection. The design and evaluation of a spatially resolving spectrograph for absorbance spectroscopy of optically dense films is presented. The measurement of the absorption spectra of spatially heterogeneous metal-phthalocyanine thin-film electrodes with peak absorbances greater than five absorbance units is described.
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Liang, Chao-Wen. "Phase Shifting Grating-Slit Test Utilizing A Digital Micromirror Device With an Optical Surface Reconstruction Algorithm." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/193833.
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A novel optical surface testing method termed the grating-slit test is demonstrated to provide quantitative measurements and a large dynamic measurement range. Although it uses a grating and a slit, as in the traditional Ronchi test, the grating-slit test is different in that the grating is used as the object and the slit is located at the observation plane. This is an arrangement that appears not to have been previously discussed in the optical testing literature. The grating-slit test produces fringes in accordance with the transverse ray aberrations of an aberrated wavefront. By using a spatial light modulator as the incoherent sinusoidal intensity grating it is possible to modulate the grating and produce phase shifting to make a quantitative measurement. The method becomes feasible given the superior intensity grayscale ability and highly incoherent illumination of the spatial light modulator used. Since the grating is used as the object, there are no significant diffraction effects that usually limit the Ronchi test. A geometrical and a detailed physical analysis of the grating-slit test are presented that agree in the appropriate limit. In order to convert the measured transverse ray aberrations to the surface figure error, a surface slope sensitivity method is developed. This method uses a perturbation algorithm to reconstruct the surface figure error from the measured transverse ray aberration function by exact ray tracing. The algorithm takes into account the pupil distortion and maps the transverse ray aberration from the coordinate system of the observation plane to the coordinate system of the surface under test. A numerical simulation proves the validity of the algorithm. To demonstrate the dynamic range of the grating-slit testing method, two optical surfaces are measured. The first surface is a polished spherical mirror with 0.6 waves of aberration as measured with an interferometer. Using the concept of transverse ray aberration separation, the first surface is measured without a strict alignment requirement. The second surface is a concave ground optical surface with 275 waves of astigmatism. The measurements from the grating-slit test yield useable surface figure information that is in agreement with the results from other testing methods.
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Pita, Ana Rita Granjo de Azevedo Vieira. "The Lean Startup approach in the implementation of a children location device." Master's thesis, Instituto Superior de Economia e Gestão, 2019. http://hdl.handle.net/10400.5/19295.
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Mestrado em Gestão/MBANesta dissertação de mestrado, a metodologia Lean Startup é usada para desenvolver uma solução comercial de um dispositivo vestível capaz de rastrear crianças.
In this master thesis, The Lean Startup methodology is used to develop a business solution of a wearable device that is able to track children.
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Sadek, Mohamed. "Design and development of a testing device for a new invented Doctor Blade." Thesis, Karlstads universitet, Avdelningen för maskin- och materialteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-30780.
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This thesis project is about designing and developing an already existing testing device for a new invented Doctor Blade. A doctor blade is a blade used for creping tissue paper of a rotating cylinder, Yankee Cylinder. The old testing device was incomplete in a way that a rotating cylinder was missing, hence the tested blade is not loaded properly. The old testing device already contained the doctor blade holding device and the pulling device (pulling the creping blade). These two devices are transferred to the new testing device without any redesign within them. The adding of a rotating cylinder/roller required some new redesign regarding the testing device. The main beam (beam carrying all elements) is replaced with a larger one in order to fit the roller and is elongated in order to run longer tests. The new beam has a larger cross section in order to minimize the risk of bending. The main beam is supplied with five small beams, welded onto it, three for attaching the holding device and two for attaching the roller. The dimensions of these small beams are chosen in order to put the roller on the right position according to the creping blade. An electric motor is added to the new testing device in order to drive the roller with a chain. This required two sprockets, one for the motor and one for the roller shaft. The sprockets are chosen with a pitch diameter ratio matching the gearing required. FMEA-analysis is done on the whole design where five failure modes were chosen to be included, bending of the main beam and motor beam, screw joints of the same beams and sprocket-chain mechanism. Some FEM-analysis was required in order to detect the bending of the beams and measuring the loading on the screw joints. The screw joint loading achieved from the FEM-analysis is used for the theoretical screw joint calculations. The FMEA-analysis implied that four of the analyzed failure modes have acceptably low risk factor and dos not require any further actions. However one received a high risk factor, the chain-sprocket mechanism, the risk of clamping fingers. This is solved by adding a protecting house/shell made of sheet metal. Measurements were done on the old and the new testing device regarding the required force for pulling the creping blade and the pressure distribution between the creping blade and the beam (and roller in the new testing device). The improvement of the pulling force values is rather due to the new designed doctor blade than due to the new testing device. The new testing device is however more appropriate than the old one hence the added roller and the tests shows that it is functional as well.Projektet handlar om design och utveckling av en redan existerande testrigg för ett nyuppfunnet kräppningsblad. Ett kräppningsblad är det bladet som just kräpper av papper från en roterande cylinder, s.k. Yankee Cylinder. Den gamla testriggen var inte komplett och saknade en roterande cylinder, därav kräppningsbladet belastades inte ordentligt. Den gamla testriggen innehöll redan en hållaranordning för kräppningsbladet och en dragstation (som drar kräppningsbladet). Dessa två delar förflyttades till den nya testriggen utan några korrigeringar. Tillägget av en roterande cylinder/vals krävde ny design för den nya testriggen. Huvudbalken (balken som bar alla delar) ersattes av en större balk för att den nya valsen ska få plats. Nya balken är även längre i syfte att kunna köra längre tester. Tvärsnittsarean hos den nya balken är större i syfte att minimera risken för böjning. Fem små balkar är fastsvetsade i den nya huvudbalken, tre för fästning av hållaranordningen och två för fästning av valsen. Placeringen av dessa fem balkar valdes i syfte att placera valsen i rätt position enligt kräppningsbladet. En elektrisk motor tillfördes till den nya testriggen i syfte att driva valsen med en kedja. Detta krävde två nya kugghjul, en för motorn och en för valsaxeln. Delningsdiametern för de två kugghjulen valdes med en viss kvot som motsvarar den utväxlingen som krävs. FMEA-analys utfördes på hela testriggen dör fem olika haveriorsaker inkluderades, böjning av huvudbalken och motorbalken, skruvförbanden på dessa två balkar och till sist kugghjul-kedja mekanismen. FEM-analys krävdes för beräkningar av böjningen på balkarne och för belastningen på skruvförbanden. Belastningen på skruvförbanden uppnåd från FEM-analysen användes senare i de teoretiska beräkningarna av skruvförbanden. FMEA-analysen angav att fyra av de fem analyserade haveriorsakerna har accepterad låg riskfaktor och kräver inga åtgärder. Dock så visade det sig att en haveriorsak fick en för hög risk faktor, kugghjul-kedja mekanismen, risken att klämma fingrar.Detta problem löstes med hjälp av att designa ett skyddshus /skal av plåt. Mätningar gjordes på den gamla och den nya testriggen på dragkrafter och tryckfördelning mellan kräppningsblad och balk (vals i den nya testriggen). Förbättringen av värden på dragkrafterna beror mer av det nydesignade kräppningsbladet än av den nya testriggen. Hursomhelst är den nya testriggen lämpligare än den gamla med tanke på tillförseln av valsen och dessutom så visar testerna att den är funktionell.
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Thakur, Lokesh K. "Design and development of an impact wear testing device for the minerals industry." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80146.
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World wide steel consumption as grinding media is estimated at over 600,000 tons per annum. Total steel media wear in a given mill (ball or SAG) grinding process is a product of three recognized wear mechanisms---impact, abrasion, and corrosion of which the contribution of each wear mechanism to total media wear has not been well established.A total media wear model can be defined on the assumption that the effect of each wear mechanism can be independently determined and this effect can be tied to mill charge motion as determined or estimated using a charge motion simulator, which allows for a total media wear model to be defined as the summation of the wear results of each mechanism. This necessitates the need for developing impact, abrasion and corrosion wear testers that will allow the study of media wear over a wide range of energy levels. Refinement of the impact test will allow studying how impact media wear at high energies behaves as a function of those energies.
This thesis research project work is focused on design and development of a high-energy impact wear tester. A comprehensive illustration on designing the newest version of the impact wear tester is explained in detail in order to exhibit how theoretical, virtual and experimental analyses could be integrated while designing a mechanical system.
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Weiner, Stephen (Stephen Andrew). "Design of mechanical testing device to measure break angle of thin, stainless steel." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32969.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.Includes bibliographical references (leaf 25).
Working with Gillette Corporation, an automated mechanical testing tool that bent a small flat piece of steel was designed. The design of the tool was an effort to improve upon previous generations of the same tool. It consisted of three main elements; a servomotor, connected to a torque transducer, which was connected to a break device. A thin piece of steel was loaded into the break device and the motor was activated, moving a flipper arm on the device which bent the steel. While bending this piece of steel, the torque transducer would relay torque and angle information to a computer. This information was collected and displayed in Excel as torque versus angle plots, which would show the moment at which the piece of steel was broken. This entire process was automated so that after loading the steel, one click of a button would run one test. Razorblades were primarily bent with the device until they would break, and for this reason, the measuring tool was called the 'blade break test.' The work consisted of designing a robust mechanical system coupling the three devices mentioned above in series. Code was written in Visual Basic that managed all the individual devices in the measuring tool, getting them to work together and linking them with a computer.
(cont.) A user interface was designed with engineers in mind, imbedding automated data collection and representation through Excel. Finally, a manual was created accompanying the device so other engineers could use, troubleshoot, and modify the 'break test.' The result of this project was the creation of a successful measuring instrument with full documentation and functionality.
by Stephen Weiner.
S.B.
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Bamps, Cédric. "Self-Testing and Device-Independent Quantum Random Number Generation with Nonmaximally Entangled States." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/266954.
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The generation of random number sequences, that is, of unpredictable sequences free from any structure, has found numerous applications in the field of information technologies. One of the most sensitive applications is cryptography, whose modern practice makes use of secret keys that must indeed be unpredictable for any potential adversary. This type of application demands highly secure randomness generators.This thesis contributes to the device-independent approach to quantum random number generation (DIRNG, for Device-Independent Random Number Generation). Those methods of randomness generation exploit the fundamental unpredictability of the measurement of quantum systems. In particular, the security of device-independent methods does not appeal to a specific model of the device itself, which is treated as a black box. This approach therefore stands in contrast to more traditional methods whose security rests on a precise theoretical model of the device, which may lead to vulnerabilities caused by hardware malfunctions or tampering by an adversary.Our contributions are the following. We first introduce a family of robust self-testing criteria for a class of quantum systems that involve partially entangled qubit pairs. This powerful form of inference allows us to certify that the contents of a quantum black box conforms to one of those systems, on the sole basis of macroscopically observable statistical properties of the black box.That result leads us to introduce and prove the security of a protocol for randomness generation based on such partially entangled black boxes. The advantage of this method resides in its low shared entanglement cost, which allows to reduce the use of quantum resources (both entanglement and quantum communication) compared to existing DIRNG protocols.We also present a protocol for randomness generation based on an original estimation of the black-box correlations. Contrary to existing DIRNG methods, which summarize the accumulated measurement data into a single quantity---the violation of a unique Bell inequality---, our method exploits a complete, multidimensional description of the black-box correlations that allows it to certify more randomness from the same number of measurements. We illustrate our results on a numerical simulation of the protocol using partially entangled states.La génération de suites de nombres aléatoires, c'est-à-dire de suites imprévisibles et dépourvues de toute structure, trouve de nombreuses applications dans le domaine des technologies de l'information. L'une des plus sensibles est la cryptographie, dont les pratiques modernes font en effet appel à des clés secrètes qui doivent précisément être imprévisibles du point de vue d'adversaires potentiels. Ce type d'application exige des générateurs d'aléa de haute sécurité.Cette thèse s'inscrit dans le cadre de l'approche indépendante des appareils des méthodes quantiques de génération de nombres aléatoires (en anglais, Device-Independent Random Number Generation ou DIRNG). Ces méthodes exploitent la nature fondamentalement imprévisible de la mesure des systèmes quantiques. En particulier, l'appellation "indépendante des appareils" implique que la sécurité de ces méthodes ne fait pas appel à un modèle théorique particulier de l'appareil lui-même, qui est traité comme une boîte noire. Cette approche se distingue donc de méthodes plus traditionnelles dont la sécurité repose sur un modèle théorique précis de l'appareil et peut donc être compromise par un dysfonctionnement matériel ou l'intervention d'un adversaire.Les contributions apportées sont les suivantes. Nous démontrons tout d'abord une famille de critères de "self-testing" robuste pour une classe de systèmes quantiques impliquant des paires de systèmes à deux niveaux (qubits) partiellement intriquées. Cette forme d'inférence particulièrement puissante permet de certifier que le contenu d'une boîte noire quantique est conforme à l'un de ces systèmes, sur base uniquement de propriétés statistiques de la boîte observables macroscopiquement.Ce résultat nous amène à introduire et à prouver la sécurité d'une méthode de génération d'aléa basée sur ces boîtes noires partiellement intriquées. L'intérêt de cette méthode réside dans son faible coût en intrication, qui permet de réduire l'usage de ressources quantiques (intrication ou communication quantique) par rapport aux méthodes de DIRNG existantes.Nous présentons par ailleurs une méthode de génération d'aléa basée sur une estimation statistique originale des corrélations des boîtes noires. Contrairement aux méthodes de DIRNG existantes, qui résument l'ensemble des mesures observées à une seule grandeur (la violation d'une inégalité de Bell unique), notre méthode exploite une description complète (et donc multidimensionnelle) des corrélations des boîtes noires qui lui permet de certifier une plus grande quantité d'aléa pour un même nombre de mesures. Nous illustrons ensuite cette méthode numériquement sur un système de qubits partiellement intriqués.
Doctorat en Sciences
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Newquist, Cathy. "The grammatic closure subtest of the ITPA as a screening device." PDXScholar, 1986. https://pdxscholar.library.pdx.edu/open_access_etds/3708.
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Identification and selection of a speech-language caseload in the school setting can be a challenging task. The initial stages of caseload selection are usually in the form of a screening procedure. Although speech-language information is gathered at that time, information about its relationship to each student's academic status is usually not obtained. Such information would be useful in a setting that requires the provision of special education services to be justified from a basis of academic need.
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Tierney, Mary Louise. "The design, fabrication, and testing of a device for early intervention weight-bearing therapy." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/23325.
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Cherla, Srinivas. "Design, testing and optimization of a microfluidic device for capture and concentration of bacteria." Thesis, Texas A&M University, 2005. http://hdl.handle.net/1969.1/4140.
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Effective detection of bacterial pathogens in large sample volumes is a challenging problem. Pre-concentration routines currently in practice before the actual detection process are cumbersome and hard to automate. An effort is made to address the problem of volume discrepancy between day-to-day samples and the concentrated samples needed for analysis. Principles of conceptual design are used in formulating the âÂÂNeed StatementâÂÂ, âÂÂFunction Structureâ and in identifying the âÂÂCritical Design Parametersâ and âÂÂDesign ConstraintsâÂÂ. Electrokinetic phenomena are used to exploit the surface charges on bacteria. Electrophoresis is used to transport the bacteria to electrode surface and âÂÂElectrostatic trappingâ is then used to capture these microbes on the electrode surface. The captured microbes can then be concentrated in a concentrator unit. A prototype microfluidic device is fabricated for showing the proof of concept. Optimization is done to minimize hydraulic power consumption and wetted volume. Observations from the initial prototype device along with the optimization results are used in building a new prototype device. Operation of this device is demonstrated by capture of bacteria from flow. Qualitative studies are conducted and preliminary quantification is also done.
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Drakopoulos, Leonidas. "Testing and evaluation of a pen input device using an interial/magnetic sensor module." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Dec/08Dec%5FDrakopoulos.pdf.
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Thesis (Electrical Engineer and M.S. in Electrical Engineering)--Naval Postgraduate School, December 2008.Thesis Advisor(s): Yun, Xiaoping. "December 2008." Description based on title screen as viewed on January 29, 2009. Includes bibliographical references (p. 57). Also available in print.
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Roselli, Eric (Eric J. ). "Design of a testing device for quasi-confined compression of lithium-ion battery cells." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68922.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 29).
The Impact and Crashworthiness Laboratory at MIT has formed a battery consortium to promote research concerning the crash characteristics of new lithium-ion battery technologies as used in automotive applications. Within a broad range of tests, there was a need to perform compression tests with a variable amount of confinement. A spring-loaded detainment device was designed which allows the battery to be confined in the axis perpendicular to compression without completely rigid walls. This provides a testing environment far more similar to the conditions of a real world crash situation. During an automobile crash event, the battery pack acts as a unit where each individual cell may experience a range of stresses from nearby cells or pack walls. An appropriate device was designed in Solidworks and used in the MIT ICL for testing with adjustable confinement during compression testing. MIT's research as a part of the consortium will continue for 3 more years beyond these initial tests. Never the less, the coming computational and constitutive models will be built using initial individual cell testing. Any model of a complete battery pack will use the material properties derived from cell testing.
by Eric Roselli.
S.B.
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Schwardt, Wilhelm Heinrich. "Insulator pollution monitoring device : development, calibration and field evaluation." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50372.
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Thesis (MScEng)--University of Stellenbosch, 2005.ENGLISH ABSTRACT: The calibration and field evaluation of an Insulator Pollution Monitoring Relay (IPMR) were the main aims of this research programme. A repeatable artificial wetting test method was developed after several modifications were made to the steam system, test chamber and the test routine. The IPMR was successfully calibrated with insulators that were artificially polluted according to the solid layer method. Linear and polynomial relationships were determined after curve-fitting techniques were performed on the results. The calibration showed that the IPMR is capable as a device relating the maximum conductivity during artificial wetting to the ESDD, a severity classification parameter. The IPMR was successfully used in a salt fog chamber to determine if the device is capable to evaluate the severity of an instantaneous pollution event. The IPMR was successfully installed at a natural pollution test site along the Cape west coast. The conductivity measurements with natural wetting showed good correlation to flashovers experienced. A rule of thumb, developed to indicate a possible risk of flashover, was based on observations made on the relationship between humidity and surface conductivity. The measured IPMR data was successfully applied to quantify the site severity according to the conductivity measurement with natural wetting. This calculated severity value could be used in the assessment of flashover probability of high voltage insulators.
AFRIKAANSE OPSOMMING: Die hoofdoel van die tesis was die kalibrasie en veldtoetse van 'n isolatorbesoedelingsmonitor (IPMR). 'n Herhaalbare nagebootste benatting-toetsmetode is ontwikkel na veranderings aan die stoomstelsel, toetsruimte en die toetsproses. Die IPMR is suksesvol gekalibreer met isolators wat besoedel was met 'n nagebootste besoedeling volgens die "solid layer method". Liniêre sowel as kwadratiese verwantskappe is ontwikkel na krommepassings op die resultate uitgevoer was. Die kalibrasie het gewys dat die IPMR in staat is om die maksimum geleidingsvermoë wat d.m.v. nagebootste benatting verkry is, met die ESDD, 'n besoedelingsklassifikasie, kan vergelyk. Die apparaat is ook suksesvol gebruik tydens soutmistoetse om te bepaal of dit in staat is om 'n skielike besoedelingsgebeurtenis te kan meet. Na die afhandeling van laboratorium werk is die apparaat by 'n natuurlike isolator besoedeling-toetsstasie langs die Kaapse weskus geïnstalleer. Die geleidingsvermoë metings met natuurlike benatting het goeie korrelasie getoon met isolator oorvonkings. 'n Skattingsmetode wat ontwikkel is om moontlike oorvonkings te voorspel, is gebaseer op waarnemings wat gemaak is van die humiditeit sowel as die oppervlakte geleidingsvermoë. Die IPMR se geleidingsvermoë metings met natuurlike benatting is aangewend om die besoedelingsgraad van die gebied te bepaal. Die bepaalde besoedelingsgraad kan verder gebruik word om die waarskynlikheid van die oorvonking van isolators vas te stel.
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Barnett, Shane. "Development of a Tow Capacity Test Device for Small Unmanned Vehicles." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/30968.
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Unmanned ground vehicles (UGVs) will increasingly be used for tasks such as retrieving injured soldiers from a battlefield, transporting supplies, and towing other small vehicles and payloads. To date, the unmanned test community has not standardized on an apparatus or test operating procedure (TOP) specifically for evaluating the towing capacity of small unmanned ground vehicles. Draw-bar testing has been adapted by several groups to quantify small unmanned ground vehicle (SUGV) tow capacity; however, these devices are inherently limited to measuring peak static towing force. This paper describes an alternative method using a variable-resistance tow sled for quantifying the dynamic towing capacity of SUGVs. The tow sled contains a frontal skid plate and a rear axle and wheel arrangement. A weighted carriage is transferred from the rear of the sled to the front of the sled by a cable geared to the rear axle. As the sled is pulled along the ground, towing resistance increases in a controlled linear fashion. An encoder on the rear axle and a load cell in the tow chain provide motion and force data. Testing of the tow sled has been conducted on a TALON SUGV at the Southwest Research Institute (SwRI) Small Robot Test Facility and a MATILDA SUGV at the Joint Unmanned Systems Test, Experimentation, and Research (JOUSTER) site.Master of Science
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Leclair, Justin. "Development and Testing of an Unpowered Ankle Exoskeleton for Walking Assist." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34463.
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Assistive technologies traditionally rely on either strong actuation or passive structures to provide users with increased strength, support or the ability to perform lost functions. At one end of the spectrum are powered exoskeletons, which significantly increase a user’s strength, but require strong actuators, complex control systems, and heavy power sources. At the other end are orthoses, which are generally unpowered and lightweight devices that rely on their structure’s mechanical behaviour to enhance user’s support and stability. Ideally, assistive technologies should achieve both systems’ characteristics by enhancing human motion abilities while remaining lightweight and efficient. This can be achieved by using distinctive actuators to harness gait energy, towards enhancing human mobility and performance.
Pneumatic Artificial Muscles (PAMs), compliant and flexible, yet powerful and lightweight, present a unique set of characteristics compared to other mechanical actuators in human mobility applications. However, given the need of a compressor and power source, PAMs present a significant challenge, limiting their application. In contrast, PAMs can be implemented as unpowered actuators that act as non-linear elastic elements.
This thesis aims to develop a wearable lightweight unpowered ankle exoskeleton, which relies on the PAM to harness gait energy and compliment the human ankle biomechanical abilities at the push off movement, thusly assisting the user in propelling the body forward during walking. Presently, limited PAM models have been developed to analyse PAM passive behaviour and to assist in designing and selecting the appropriate PAM for unpowered application. Thus, this thesis aims to develop a passive model for the PAM.
To mechanically validate the proposed exoskeleton design, a prototype is fabricated, and tested within an Instron tensile machine setup. The unpowered exoskeleton has shown its ability to provide significant contribution to the ankle timed precisely to release at the push off phase of the gait cycle. Furthermore, the proposed PAM stiffness model is validated experimentally, and accounts for muscle pressure, geometry, material and stretching velocity. This enables the evaluation of the impact of various parameters on the muscle behaviour and designs the PAM accordingly for the unpowered ankle exoskeleton
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Okoh, Fred I. "A syllabus for an undergraduate course in polymer chemistry: the classroom testing of this device." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1985. http://digitalcommons.auctr.edu/dissertations/3210.
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Domènech, Gil Guillem. "Advances in semiconducting nanowires for gas sensing: synthesis, device testing, integration and electronic nose fabrication." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/668365.
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The work presented in this dissertation is focused on the fabrication, integration and test of chemoresistive gas sensor devices and systems based on semiconducting nanowires (NWs).
The first objective of this dissertation was to grow monocrystalline In2O3 and Ga2O3 NWs via the vapor-liquid-solid mechanism using a chemical vapor deposition furnace and solid precursors. Subsequently devices based on individual NWs were fabricated, contacted on top of microhotplates using Focused Electron Beam Induced Deposition (FEBID), and their gas sensing properties were characterized. The gas sensors based on individual In2O3 NWs present considerable response towards ethanol at 300 ºC, with a response time of about 4 minutes. On the other hand, the gas sensors based on individual Ga2O3 NWs showed high selectivity towards relative humidity at room temperature, with resistance variations up to 90% in times as short as 2 minutes, and with minimal response to other gases (NO2, CO, ethanol and H2). This behavior is completely different from that reported on this material and is a direct consequence of the NW growth method, which gives rise to a carbon shell around the NWs. Furthermore, the sensing behavior ressembles that of carbon-containing materials..
A second objective was to deepen into methodologies to integrate the sensing material in the substrates where the gas sensing devices are fabricated, with the aim of simplifying the integration procedures and increasing the throughput. With this in mind, dielectrophoretic alignment of NWs was the first methodology proposed to fabricate chemoresistors based on arrays of individual WO3 NWs. The maximum gas response of the fabricated arrays of individual NWs was towards 5 ppm of NO2 for the pristine and towards 100 ppm of EtOH for the Pt-functionalized WO3 NWs, respectively. This higher response of the Pt-functionalized WO3 NWs-based gas sensors is related to the surface decoration of these NWs, which increases the amount of oxygen adsorbed species at their surface, allowing EtOH molecules to be more easily adsorbed than on pristine NWs. The second approach proposed for contacting individual SnO2 NWs on top of suspended microhotplates was Electron Beam Lithography (EBL) in combination with lift-off. The method allows fabricating several devices sequentially but without breaking the vacuum of the EBL system and required optimization of the holder for spinning and of the electron dose used to modify the photoresist properties. The gas characterization of these devices showed higher resistance variations than that obtained for the reference fabrication technique, FEBID. This superior behavior can be the result of the better electrical characteristics of the Ti/Pt contacts in front of the FEBID Pt-deposition. This demonstrates the potentiality of this techniques for contacting individual NWs on top of micromembranes.
The third objective was, to a certain point, a natural extension of the device integration activity when considering one of the major drawbacks of chemoresistors: their lack of selectivity. For this, SnO2, WO3 and Ge NWs, have been grown on well-defined and pre-specified regions of one single chip, allowing their simultaneous operation. Here, NO2, CO and relative humidity (RH), diluted in dry synthetic air, have been tested. The calibration of each individual sensor has been carried out exposing the whole chip to the individual gases but with only this particular sensor heated and biased, while the others were unheated and unbiased. This has allowed determining the optimal operation conditions for each sensor. Next, at these optimal temperatures, all the sensors have been tested, simultaneously, towards each gas specie alone. Finally, tests of the three sensors, operating simultaneously, towards mixtures of the three gases were performed. The data from all the mentioned measurements have been treated according to the Principal Component Analysis (PCA) methodology and the results demonstrate that the fabricated sensor system can discriminate and quantify the concentration of the three different studied analytes. The three sensors, made of three different materials and operating simultaneously, constitute an electronic nose, which we here call nano electronic nose.Aquesta tesi doctoral està enfocada al desenvolupament de dispositius i sistemes sensors de gas basats en nanofils semiconductors monocristal·lins. El primer objectiu aconseguit és el creixement de nanofils d’In2O3 i de Ga2O3 utilitzant un forn pel dipòsit químic en fase vapor. Els nanofils fabricats s’han transferit a xips amb micromembranes suspeses amb calefactor i nanofils individuals s’han contactat amb els seus elèctrodes, emprant el dipòsit assistit per feixos d’electrons. Els nanofils d’In2O3 mostren una resposta considerablement selectiva enfront d’etanol a partir dels 200 ºC i els de Ga2O3 són molt selectius a la humitat relativa a temperatura ambient, fruit del mètode de creixement. Un segon objectiu d’aquesta tesi ha estat explorar dos mètodes d’integració de nanofils individuals: la dielectroforesi, per alinear nanofils de WO3, que han mostrat respostes enfront d’etanol i NO2, a 250 ºC, i la litografia per feixos d’electrons, per contactar nanofils de SnO2 sobre microplataformes calefactores suspeses, que han mostrat respostes satisfactòries enfront d’amoníac a 200 ºC. En ambdós casos s’ha demostrat la viabilitat d’aquestes tècniques. L’últim objectiu ha estat la fabricació i caracterització d’un nas electrònic basat en xarxes de nanofils de SnO2, WO3 i Ge integrades en cadascuna en una micromembrana d’un mateix xip. Aquests nanofils s’han fet créixer directament en regions localitzades i predefinides del xip, les micromembranes, integrats directament en ell, evitant la necessitat de transferir-los després de fer-los créixer. Primer s’ha realitzat el calibratge de cada sensor individual enfront de tres gasos individualment, després enfront de tres gasos simultàniament i, finalment, els tres sensors s’han fet funcionar alhora enfront dels tres gasos. Les dades de totes les mesures s’han tractat segons la metodologia d’anàlisi de components principals i els resultats demostren que aquest sistema és capaç de discriminar entre diverses mescles de NO2 i CO diluïts en aire sintètic sota diferents nivells d’humitat relativa. Els tres sensors, formats per els tres materials diferents i funcionant simultàniament, constitueixen un nano nas electrònic.
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Paiva, Godinho Raquel. "Open Device Labs - a global community movement to democratise testing and evaluation on real devices." Doctoral thesis, Universitat de Vic - Universitat Central de Catalunya, 2020. http://hdl.handle.net/10803/668637.
Full textAbstract:
Han sorgit xarxes de laboratoris oberts a tothom i caracteritzats per la seva activitat
local i connectivitat global per atendre diferents demandes del usuaris. Open Device
Labs (ODLs) és un moviment comunitari de base que té per objectiu democratitzar les
proves i l'avaluació en dispositius digitals reals, que fins ara havia estat inexplorat. Els
ODLs són un espai normalment equipat amb dispositius mòbils (per exemple: telèfons
intel·ligents i tauletes tàctils) connectats a Internet amb la finalitat que els usuaris
puguin fer proves de d’aplicacions web, jocs, i mòbils. L’objectiu d’aquesta tesi ha estat
investigar l'ecosistema dels Open Device Labs per tal de presentar-ne les seves
principals característiques, pràctiques, beneficis i reptes. La recerca s’ha realitzat
mitjançant una investigació qualitativa d’estudi de casos i s’ha dividit en quatre unitats
centrals. La secció I va explorar l’ecosistema d’ODLs, el local i el global, a través del
nucli de la comunitat des de la perspectiva dels amfitrions i centrat en els ODL
professionals. La secció II va investigar la perspectiva que tenen els usuaris convidats
dels ODLs sobre el servei. La secció III va explorar el potencial de la comunitat per
beneficiar-se de la indústria del joc. Per últim, la secció IV presenta un marc per
establir ODL acadèmics.Open labs networks characterised by local activity and global connectivity have emerged to address different demands. Open Device Labs (ODLs) is a grass-roots community movement, which aims to democratise testing and evaluation on real devices, thus far unexplored academically. An ODL is a space typically equipped with mobile devices (e.g. smartphones and tablets) connected to the Internet for Web and app testing purposes. This PhD thesis investigates the ODL ecosystem to identify its main characteristics, practices, benefits, and challenges. We conducted a qualitative inductive case study through four main units. Section I explores the ODL ecosystem, both local and global, through the community core from the hosts’ perspective and focuses on professional ODLs. Section II discusses the investigation of the ODL’s guest users’ perspective of the service. Section III explores the potential of the community to benefit the gaming industry. Section IV examines a single case of an academic ODL. Lastly, the final section presents a framework for establishing academic ODLs.
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Mansfield, Danielle Scarlet. "Flow Valve Diagnostics for Label-Free, Quantitative Biomarker Detection: Device Fabrication, Surface Modification, and Testing." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3742.
Full textAbstract:
Diseases are often diagnosed by detection of disease-specific biomarkers in fluid samples. However, many state-of-the-art detection methods require a lab with complex machinery, trained operators, and/or lengthy analysis time. In contrast, point-of-care (POC) devices are brought to the patient's location, they are easy to use, and results are obtained almost immediately. Many current POC devices are too difficult to be used without a skilled assistant, and although many are able to detect analytes above a threshold value, they give little or no quantitative information. This work presents the development of polymer-based microfluidic devices capable of sensing and quantifying biomarkers in fluid samples in a straightforward manner using a novel biomarker assay termed "flow valve diagnostics". In this assay, an antibody-modified polydimethylsiloxane (PDMS) microchannel constricts due to the binding force between antibodies and antigens, stopping fluid flow. The flow distance is measured and correlated to antigen concentration. This detection method is an improvement over other methods because it is an innovative, non-instrumented, label-free, easy-to-use approach. These devices are small, portable, disposable, inexpensive, and thus ideal for use in POC testing. I have successfully fabricated flow valve devices with standard micromachining techniques, including photolithography, replica molding with PDMS, and plasma oxidation. Following fabrication, I compared two methods for attaching receptor biomolecules (e.g., antibodies) to the microchannel surfaces: non-specific adsorption and silanization with 3-glycidoxytrimethoxypropylsilane (GOPS). I used laser-induced fluorescence to determine that silanization with GOPS was the better method for biomolecule attachment. Finally, I tested antibody-modified flow valve devices with target antigens to determine if the antibody/antigen binding force was strong enough to cause channel pinching and flow stoppage. By modifying the device design and using higher antigen concentrations, I was able to show that flow valve devices can detect antigens in a concentration-dependent manner. Future work to improve the device design and to modify and test these devices with different receptor/target pairs will bring flow valve diagnostics closer to becoming a valuable asset in biomarker detection and POC testing.
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Hopkins, Alyssa Erin. "THE TESTING AND FUTURE DEVELOPMENTS OF A NERVE STIMULATION DEVICE FOR THE TREATMENT OF MIGRAINES." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/454.
Full textAbstract:
The development of neural stimulations devices may help treat many patients who suffer from migraines and chronic headaches via an electrical stimulation to the patient’s nerve. The electrical stimulation will mask the pain associated with these diseases. The system is subcutaneously implanted into the back of the neck and recharged via inductive coupling. Discussed is the transmission of signals in nerve fibers and the testing involved with neural stimulation implantable devices. Research was performed for preliminary testing on the charging rates, tests to analyze the heat dissipated during recharging, ergonomic factors to be considered, developing a model to simulate an in vivo environment.
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Gomes, Ashen. "Testing and analysis of an intelligent electronic device (IED) prototype for MTDC overhead line application." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286780.
Full textAbstract:
A key problem faced with the implementation of a multi-terminal direct current (MTDC) grid is fault mitigation. One method extensively researched in mitigating a fault in MTDC is to use protection intelligent electronic devices (IEDs) and fast direct current circuit breakers (DCCBs). The IEDs are able to detect and identify faults with fault algorithms. In this study overhead line MTDC systems are investigated to identify the best algorithm for overhead line (OHL) MTDC fault mitigation and the resulting algorithm is tested on a protection IED. Three models: short line, long line and combined line models are developed with varying DC line lengths on the software PSCAD and are analysed under line to line (L-L) and line to ground (L-G) faults with multiple fault impedance at a variety of fault locations. The voltage derivative algorithm has performed the best in detecting and identifying faults under OHL conditions. However, its performance declines with the increase of length of DC lines of the MTDC. Therefore, transient based algorithms were also tested. They are a better _t for remote faults compared to voltage derivative algorithms. However, they perform poorly for close faults. The critical threshold for fault detection is obtained through the algorithms and are implemented to the IED. A waveform generator will simulate faults and the IED is tested with the critical threshold obtained. The IED performed as expected and produced results similar to the software analysis. The critical threshold obtained through the algorithm was applicable to all DC lines of MTDC grid. Wide adaptation of MTDC is expected and this will increase complexity in the grid network and modelling of it. Therefore, new lines implemented to MTDC grids may have to identify their critical protection threshold with simplified MTDC grid models. Evidence towards the possibility of modelling a point-to-point high voltage direct current (HVDC) system to identify threshold values can be obtained from this study as the results suggest that the maximum derivative values are highest for internal faults rather than external faults.Ett centralt problem inför implementeringen av ett multiterminalt DCnät (MTDC-nät) är feldetektering och bortkoppling av fel. En metod som har undersökts mycket för att detektera och bortkoppla ett fel i MTDC-nät är att använda en skydds-IED (intelligent electronic device) och likströmsbrytare (eng: direct current circuit breakers, DCCBs). En IED kan upptäcka och identifiera fel med hjälp av skyddsalgoritmer. Denna studie syftar till att identifiera den bästa algoritmen för feldetektering i luftledningar i MTDC-nät och den resulterande algoritmen testas på en skydds-IED. Tre linjemodeller: korta, långa och kombinerade implementeras i programvaran PSCAD och simuleras under pol-pol-fel och pol-jord-fel med era felimpedanser på en mängd olika felplatser. Spänningsderivataalgoritmen har fungerat bäst för att upptäcka och identifiera fel i luftledningar. Men dess prestanda minskar med längden hos DC-linjernas för MTDC. Därför testades också transientalgoritmer. De passar bättre för fjärrfel jämfört med algoritmer baserade på spänningsderivata. De fungerar dock dåligt för närliggande fel. Den kritiska tröskeln för feldetektering erhölls genom algoritmerna och implementerades i IEDn. En vågformgenerator simulerade fel och IEDn testades med den kritiska tröskel som erhölls. IEDn fungerade som förväntat och producerade resultat som liknar programvarans analys. Den kritiska tröskeln som erhölls genom algoritmen var giltig för alla DC-linjer i nätet. Bred anpassning av MTDC förväntas och detta kommer att öka komplexiteten i nätverket och dess modellering. Därför kan nya linjer implementerade för MTDC-nät behöva identifiera dess kritiska skyddströskel utan att modellera hela nätet. Denna studie indikerar att det är möjligt att modellera ett punkt-till-punkt HVDC-system för att identifiera tröskelvärden för ett MTDC-nät eftersom resultaten antyder att de maximala derivatavärdena är högst för interna fel snarare än för externa fel.
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Fischer, Dustin. "The Design and Construction of a Bulge Testing Device Platform for Human Skin Tissue Applications." Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/32670.
Full textAbstract:
Limited standard mechanical testing practises and stress-strain data are available for anisotropic human skin tissue in biaxial loading configurations to suitably represent skin in vivo. Inconsistencies in mechanical and physical properties in the literature due to numerous physiological factors have restricted development of biaxial testing equipment in laboratories to ad hoc research solutions having limited modifiability and parametric control. This project aims to develop a biaxial tensile testing device and testing platform which can be used in a research laboratory setting to provide a springboard to expediate mechanical skin tissue testing. The device can be easily reconfigured to accommodate a range of bulge pressures, while being driven via a 10bar compressed air supply. Based on simplified modelling of skin as an elastomer, mechanical and pneumatic resistivecapacitive pressure vessel models are developed. These are used respectively to initially specify a modifiable piston-cylinder bulge testing apparatus, and to design a customisable discrete proportional-integral closed-loop feedback pressurisation rate control system and software control environment. Pressure-time histories were successfully collected and stored on a dedicated computer for silicone sheet samples of 50mm diameter, as a surrogate for skin, that were tested using the platform to maximum pressures of about 200 kPa, at rates set between 2 20 kPa/s. The efficacy of the rate control system was affected by resolution of discrete pressurisation components that were used. The described platform is currently suitable for controlled and measured bulge pressurisation of elastomers. It is recommended to extend facility of the current platform by integrating 3D imaging and measurement technologies, to evaluate deformation of bulged anisotropic skin tissue and map inhomogeneous stress-strain fields for complex tensile stress-strain evaluations.
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Mays, Patricia Faye. "Seal strength models for medical device trays." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2756.
Full text
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Shakra, Mohamed, and Ahmad Jabali. "Evaluating Security For An IoT Device." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289631.
Full textAbstract:
IoT systems usage is rapidly growing, and is involved in many industries causing more potential security flaws to a freshly new field. Even light bulbs, have a new generation called smart light bulbs have taken a step into the IoT world. In this project an affordable and available light bulb has it’s security evaluated by using a well known attacks to test the device security. It was concluded that the studied light bulb was found to be secured by the array of penetration tests carried in this project. However, the methods used for evaluating the device can be applicable to any other IoT for any future security evaluation.IoT-systemanvändningen växer snabbt och är involverad i många branscher som orsakar fler potentiella säkerhetsbrister i ett nyligen nytt fält. Även glödlampor, har en ny generation som heter textit smarta glödlampor har tagit ett steg in i IoT- världen. I det här dokumentet utvärderas en prisvärd och tillgänglig glödlampa genom att använda en välkänd attack för att testa enhetens säkerhet. Det drogs slutsatsen att den studerade glödlampan befanns vara säkrad genom den mängd penetrationstester som utfördes i detta dokument. Metoderna som används för att utvärdera enheten kan dock tillämpas på vilken annan IoT som helst för framtida säkerhetsutvärdering.
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Sabatka, Kyle Matthew. "Design and testing of an MR drum rotary device to achieve a variable effective compliance transmission." Connect to resource, 2006. http://hdl.handle.net/1811/5982.
Full textAbstract:
Thesis (Honors)--Ohio State University, 2006.Title from first page of PDF file. Document formattted into pages: contains xi, 86 p.; also includes graphics. Includes bibliographical references (p. 85-86). Available online via Ohio State University's Knowledge Bank.
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Marshall, Justin D. "Development, Analysis and Testing of a Hybrid Passive Control Device for Seismic Protection of Framed Structures." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/30152.
Full textAbstract:
A new seismic protection strategy called the hybrid passive control device (HPCD) has been developed which combines typical passive energy dissipation devices. It consists of a high damping rubber (HDR) sandwich damper in series with a buckling restrained brace (BRB). The HPCD provides energy dissipation at small deformations without significantly decreasing the structural period. The significant energy dissipation capacity of a BRB is provided for significant seismic events in the second phase. The transition between these two phases consists of an increasing stiffness as the device transitions from rubber damper to BRB. The HPCD reduces deformations, forces and accelerations from seismic events. The hyperelastic or stiffening effect also prevents resonant build-up and aids in collapse prevention due to p-delta effects.
The first phase of this work included characterization of high damping rubber compounds and analytical modeling of the HPCD concept. Experimental testing was completed to measure both the static and dynamic material properties of six different rubber compounds. The two most promising rubber compounds were selected for possible inclusion in the device. Analytical models of these selected materials were developed for nonlinear solid finite element analysis. The most promising configuration of the device was selected from several options. The selected configuration was analyzed using the commercial finite element program ABAQUS. These models were used to confirm the validity of the theoretical behavior of the device. Additionally these tests were used to determine which of the rubber compounds performed best.
Experimental testing of a half-scale HPCD specimen was carried out in the Structures and Materials Research Laboratory at Virginia Tech. The prototype was tested under cyclic and static loads. The experimental tests confirmed the potential of the hybrid device while highlighting minor issues with the design of the prototype. The final component in the research was an analytical study using hybrid devices in a 9-story steel moment frame structure. The devices were found to provide improved response over a special steel moment frame and a moment frame combined with a buckling restrained brace frame.Ph. D.