Thematische Bibliographien / Device for testing differentials

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Auswahl der wissenschaftlichen Literatur zum Thema „Device for testing differentials“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 17. Februar 2022

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Zeitschriftenartikel zum Thema "Device for testing differentials"

Willoughby, Kim A., Jeff S. Uhlmeyer, Joe P. Mahoney, Keith W. Anderson und Linda M. Pierce. „Construction-Related Variability in Pavement Mat Density due to Temperature Differentials“. Transportation Research Record: Journal of the Transportation Research Board 1849, Nr. 1 (Januar 2003): 166–73. http://dx.doi.org/10.3141/1849-18.

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The work reported on is an extension of work done in Washington State to examine the systematic occurrence and variability in pavement mat density. The focus will be on the extent of the pavement that is affected by variable density due to temperature differentials and the fact that randomly based testing does not identify the occurrence of cyclic density differentials. Temperature differentials 14°C (25°F) or greater generally cannot be compacted to the same level of density as the surrounding mat and therefore lead to significant density differentials (increase in air voids of 2% or more). A cyclic pattern typically occurs, matching each delivered truckload of mix, although temperature differentials can occur randomly or not at all, depending on the remixing device. The largest extent of pavement is affected when no remixing occurs and temperature differentials develop for every truckload of hot mix. These temperature differentials can cover the entire width and affect up to 50% of the mat. If the delivered hot mix is thoroughly remixed before placement, temperature differentials are minimal. Although density will vary in any paving operation, it was found that a uniform temperature mat greatly increases the ability to achieve a uniform density. Because of this cyclic pattern of variable density, random sampling for in-place density does not properly identify or quantify this problem. It is recommended that temperature differential areas be determined during construction and excluded from the random sampling used for acceptance testing. The issue of variable densities due to temperature differences or aggregate segregation should be identified and eliminated at the start of the project.

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Giridharan, Guruprasad A., Michael A. Sobieski, Mickey Ising, Mark S. Slaughter und Steven C. Koenig. „Blood Trauma Testing For Mechanical Circulatory Support Devices“. Biomedical Instrumentation & Technology 45, Nr. 4 (01.07.2011): 334–39. http://dx.doi.org/10.2345/0899-8205-45.4.334.

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Abstract Preclinical hemolysis testing is a critical requirement toward demonstrating device safety for U.S. Food and Drug Administration (FDA) 510(k) approval of mechanical circulatory support devices (MCSD). FDA and ASTM (formerly known as the American Society for Testing and Materials) have published guidelines to assist industry with developing study protocols. However, there can be significant variability in experimental procedures, study design, and reporting of data that makes comparison of test and predicate devices a challenge. To overcome these limitations, we present a hemolysis testing protocol developed to enable standardization of hemolysis testing while adhering to FDA and ASTM guidelines. Static mock flow loops primed with fresh bovine blood (600 mL, Hematocrit = 27±5%, heparin titrated for ACT >300 sec) from a single-source donor were created as a platform for investigating test and predicate devices. MCSD differential pressure and temperature were maintained at 80 mmHg and 25°±2° C. Blood samples (3 ml) were collected at 0, 5, 90, 180, 270, 360 minutes to measure CBC and plasma free hemoglobin. This protocol led to 510(k) approval of two adult MCSD and has been used to test novel cannulae and a pediatric MCSD. Standardization of hemolysis testing procedures and transparency of results may enable better blood trauma characterization of MCS devices to facilitate the FDA 510(k) and PMA submission processes and improve clinical outcomes.

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Wang, Zhe, Yuan-hua Yu, Zhan-jiang Yu und Qi-meng Chen. „Blood coagulation dynamic testing sensor based on electromagnetic vibration“. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 233, Nr. 6 (12.04.2019): 611–20. http://dx.doi.org/10.1177/0954411919837308.

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Rapid detection techniques and methods of blood coagulation have attracted wide attention in academia and the business community in the presence of the increased demands for rapid assessment (point-of-care testing) of patients from surgery, intensive care unit, and other departments. The differential equation of vibration system composed of elastic support and electromagnetic induction devices was set up using the principle of damping vibration and establishing the dynamics model; meanwhile, the harmonic response analysis and vibration fatigue coupling analysis were carried out, the analysis results were optimized, and the experimental device of the electromagnetic induction testing sensor was established. In addition, the experimental device with blood coagulation reagent was assorted to establish the standard point-of-care testing rapid blood coagulation detection curve, and to compare the testing curve with that of the imported point-of-care testing blood coagulation instrument. The results showed that the first-order natural frequency of the designed sensor was 102.35 Hz, the correlation between the designed sensor and the imported equipment was 0.996, and the testing repeatability of the designed sensor could reach 0.002. Therefore, the designed blood coagulation testing sensor based on electromagnetic induction had the characteristics of favorable elasticity and anti-fatigue, which could meet the accuracy requirements of clinical detection. Taken together, this study could provide the core technology for developing the point-of-care testing instrument for blood coagulation dynamic testing.

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Li, Rui, Shu Yong Song, Hui Ping Zheng, Zhen Guo Ma, Hui Yong Li und Tong Yu Zhang. „Design on Synchronize Debugging Device for Extra High Voltage Transmission Line Longitudinal Protection“. Advanced Materials Research 805-806 (September 2013): 926–29. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.926.

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Because of time urgent before putting into operation and different place line protection equipment located, joint debugging for extra high voltage (EHV) transmission line is often not perfect although EHV transmission line is very important for modern grid. In joint debugging process, we tend to adopt static method to do fault simulation, that apply analogue to the device. To overcome the shortages of static fault simulation commonly used, which cannot accurately simulate fault characteristics in runtime, a synchronous joint debugging device is designed based on based on the analysis of the joint debugging process for line longitudinal protection. The device is a lightweight and low cost embedded system with the functions of communication and phase shift, and can offer analog signals to protection devices on both ends of the line. Based on the functions and characteristics of the synchronous joint debugging device, the joint debugging process with this device of optical fiber differential protection is analyzed. The functions of this synchronize testing device can meet the requirements, turning static to dynamic joint debugging.

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Pan, Xiaodong, Guanghui Wei, Xinfu Lu, Lisi Fan und Xing Zhou. „Research on Wideband Differential-Mode Current Injection Testing Technique Based on Directional Coupling Device“. International Journal of Antennas and Propagation 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/143068.

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This paper presents a new kind of differential-mode current injection test method. The equal response voltage on the cable or the antenna port of the equipment under test (EUT) is regarded as equivalent principle for radiation and injection test. The injection and radiation response analysis model and the injection voltage source extrapolation model in high intensity radiated field are established. The conditions of using differential-mode current injection as a substitute for radiation are confirmed. On the basis of the theoretical analysis, the function and structure design scheme of the directional coupling device is proposed. The implementation techniques for the single differential-mode current injection method (SDMCI) and the double differential-mode current injection method (DDMCI) are discussed in detail. The typical nonlinear response interconnected systems are selected as the EUT. The test results verify the validity of the SDMCI and DDMCI test methods.

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Wang, Yu Jun, Li Jie Wang, Zhen Zhou, Yong Qing und Jin Ying Yin. „Research of Detecting System on Aneroid Capsule of Height Control Module of Automatic Unlocking Device“. Applied Mechanics and Materials 513-517 (Februar 2014): 3536–42. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.3536.

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Function detecting method on height control module of automatic unlocking device for parachute are explored, principle scheme and framework of the function detecting system for height control module are developed. Intelligent testing method for displacement of aneroid capsule that is the most important key component in the height control module of automatic unlocking device is put forwarded. Displacement sensor based on differential transformer is adopted to acquire the displacement information of the aneroid capsule. Sensor testing circuit and the signal processing circuit are designed. In order to make the high altitude simulation test of displacement variability of capsule stack, experimental chamber of pressure control and test based on SCM control technique is developed, furthermore, experimental data of pressure and displacement are analyzed and processed. It is shown that accuracy of displacement is lower than 0.05mm, and pressure resolution is controlled within 0.06hPa. The detecting system can be used for reliability test for height control module of Automatic Unlocking Device, and the testing and controlling methods above can be also applied for displacement and pressure measurement of other similar mechanical components.

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Yue, Mingming, Weimin Zhang und Xin Jin. „Eddy current testing device for detecting pipeline defects based on the principle of differential excitation“. Insight - Non-Destructive Testing and Condition Monitoring 60, Nr. 6 (01.06.2018): 306–10. http://dx.doi.org/10.1784/insi.2018.60.6.306.

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Xie, Xinwu, Zhen Cheng, Youchun Xu, Ran Liu, Qi Li und Jing Cheng. „A sheath-less electric impedance micro-flow cytometry device for rapid label-free cell classification and viability testing“. Analytical Methods 9, Nr. 7 (2017): 1201–12. http://dx.doi.org/10.1039/c6ay03326a.

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A sheath-less PDMS microfluidic IFC device with a simple structure was constructed, with a good performance in single-cell detection. The electrical conductance and susceptance were used to differentiate the beads/cells.

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Othman, Norazila, Mohd Zarhamdy Md. Zain, Iskandar Shah Ishak, Abdul Rahim Abu Bakar, Mastura Ab Wahid und Maziah Mohamad. „A colour recognition device for the visually disabled people“. Indonesian Journal of Electrical Engineering and Computer Science 17, Nr. 3 (01.03.2020): 1322. http://dx.doi.org/10.11591/ijeecs.v17.i3.pp1322-1329.

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Visually disabled people rely on the sense of touch and sense of hearing to help them recognise anything in their everyday life. Colours, however, is also important in giving information about things such as the colour of cash note (blue, green, red, orange and purple), the colour of spices (yellow turmeric, red chilli, green chilli) and colour of cloth. Without a sense of visual, they are not able to recognise colour and perceive the beauty of colour. This study was conducted to develop a colour recognizer for visually ‎disabled people‎. Colour recogniser used the colour sensor to sense the colour, microcontroller to recognise the colour and notify the user using a speech generator and speaker. The device is powered by dry cell batteries and designed to be user-friendly, practical and portable. The testing is done to show that this device was able to sense and differentiate 12 primary colours in the RGB colour wheel and validated the accuracy of this devices.

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Rediniotis, Othon K. „A Computer-Controlled Pressure Standard“. Journal of Fluids Engineering 121, Nr. 1 (01.03.1999): 210–12. http://dx.doi.org/10.1115/1.2822006.

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The operating principles, as well as the technical aspects of the implementation of a new computer-controlled pressure standard are presented. The instrument can have dual use: either as a pressure source or as a pressure sensor. The device is intended mostly for use in problems where small differential pressures are of interest, i. e., 0–2.5 KPa and high accuracy is desired. Such a pressure range encompasses, for example, most of the pressure measurement applications in subsonic wind-tunnel testing. The device interfaces to a PC and is ideal for fully-automated pressure transducer calibration applications. The accuracy of the pressures produced or measured by the device is 0.08 percent F. S. (Full Scale).

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Dissertationen zum Thema "Device for testing differentials"

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, und 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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Bücher zum Thema "Device for testing differentials"

Schroder, Dieter K. Semiconductor material and device characterization. Hoboken, N.J: John Wiley, 2005.

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Semiconductor material and device characterization. 2. Aufl. New York: Wiley, 1998.

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Semiconductor material and device characterization. New York: Wiley, 1990.

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Semiconductor material and device characterization. 3. Aufl. [Piscataway, NJ]: IEEE Press, 2006.

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Schroder, Dieter K. Semiconductor Material and Device Characterization. New York: John Wiley & Sons, Ltd., 2006.

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Hebner, R. E. Report of tests on Joseph Newman's device. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Jywe, W. A computer-aided accuracy testing device for machine tools. Manchester: UMIST, 1992.

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C, Church James. Device for in situ measurement of coal cutting forces. Avondale, Md: U.S. Dept. of the Interior, Bureau of Mines, 1985.

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Pappas, Deno M. Evaluation of a punch shear test device. Phg [Pittsburgh], PA: U.S. Dept. of the Interior, Bureau of Mines, 1990.

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Mulroy, William J. Evaluation of a standard device for calibrating calorimeter test rooms. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Buchteile zum Thema "Device for testing differentials"

Karlsteen, Magnus, Johan Samuelsson und Christian Finnsgård. „Testing and Evaluation of a Differential GNSS Tracking Device for Alpine- and Cross-Country Skiing“. In Communications in Computer and Information Science, 36–54. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-14526-2_3.

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Nolan, Godfrey, Onur Cinar und David Truxall. „Device Testing“. In Android Best Practices, 147–64. Berkeley, CA: Apress, 2013. http://dx.doi.org/10.1007/978-1-4302-5858-2_7.

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Luppa, Peter B. „Device classes“. In Point-of-Care Testing, 19–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-54497-6_3.

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Collin, J. P., und B. Courtois. „Device Testing and Sem Testing Tools“. In Testing and Diagnosis of VLSI and ULSI, 469–506. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1417-9_18.

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Spitzenberger, Folker, Claus Langer und Ulrich M. Gassner. „Medical device legislation and POCT“. In Point-of-Care Testing, 251–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-54497-6_25.

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Kobayashi, Masahiro, und Takao Kaneda. „Reliability Testing of Planar InGaAs Avalanche Photodiodes“. In Semiconductor Device Reliability, 413–21. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2482-6_23.

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Edge, Charles, und Rich Trouton. „A Culture of Automation and Continual Testing“. In Apple Device Management, 471–544. Berkeley, CA: Apress, 2019. http://dx.doi.org/10.1007/978-1-4842-5388-5_9.

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Steinbauer, P., und M. Valášek. „Mechatronic Lighting Pole Testing Device“. In Recent Advances in Mechatronics, 127–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-05022-0_22.

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Glaros, N. A., und E. A. Kayafas. „Experimental Device For IC Testing“. In System Fault Diagnostics, Reliability and Related Knowledge-Based Approaches, 417–22. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3931-8_32.

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Halt, Gerald B., John C. Donch, Amber R. Stiles, Lisa Jenkins VanLuvanee, Brandon R. Theiss und Dana L. Blue. „FDA Meetings and Device Testing“. In FDA and Intellectual Property Strategies for Medical Device Technologies, 27–59. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-04462-6_3.

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Konferenzberichte zum Thema "Device for testing differentials"

Wells, Dax B., Benjamin C. Groen und Robert H. Todd. „Investigation of Mechanical Differentials as Continuously Variable Transmissions“. In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47479.

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In recent years the increasing demand for fuel efficient and less pollutant vehicles has stimulated the development of hybrid and electric vehicles. These vehicle platforms often incorporate drivetrains which utilize multiple power sources for vehicle propulsion to increase fuel mileage and reduce emissions. Understanding the torque and RPM relationship within the power transmission device used to combine power sources is fundamental to overcoming the design challenges associated with hybrid/electric vehicle platforms. Results from this research include the fundamental torque and RPM relationships that exist in a multiple-input, single-output power transmission device. Results were deduced from a test incorporating two separate power inputs into a mechanical differential, which produced a single output. Testing showed that a mechanical differential has the ability to function as an infinitely variable transmission (IVT). Additionally, recommendations for overcoming some of the challenges associated with using a mechanical differential as a multiple-input, single-output device were identified.

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Cao, Minghe, Weimin Zhang, Weiqin Zeng und Chengfeng Chen. „Research on the device of differential excitation type eddy current testing for metal defect detection“. In 2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology & Application (FENDT). IEEE, 2013. http://dx.doi.org/10.1109/fendt.2013.6635547.

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Yamamoto, K., M. Suda und T. Okayasu. „2GS/s, 10ps Resolution CMOS Differential Time-to-Digital Converter for Real-Time Testing of Source-Synchronous Memory Device“. In 2007 IEEE 29th Custom Integrated Circuits Conference. IEEE, 2007. http://dx.doi.org/10.1109/cicc.2007.4405700.

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Fossati, Fabio, Ilmas Bayati, Sara Muggiasca, Ambra Vandone, Gabriele Campanardi, Thomas Burch und Michele Malandra. „Pressure Measurements on Yacht Sails: Development of a new system for wind tunnel and full scale testing“. In SNAME 22nd Chesapeake Sailing Yacht Symposium. SNAME, 2016. http://dx.doi.org/10.5957/csys-2016-007.

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The paper presents an overview of a joint project developed among Politecnico di Milano, CSEM and North Sails, aiming at developing a new sail pressure measurement system based on MEMS sensors (an excellent compromise between size, performance, costs and operational conditions) and pressure strips and pads technology. These devices were designed and produced to give differential measurement between the leeward and windward side of the sails. The project has been developed within the Lecco Innovation Hub Sailing Yacht Lab, a 10 m length sailing dynamometer which intend to be the reference contemporary full scale measurement device in the sailing yacht engineering research field, to enhance the insight of sail steady and unsteady aerodynamics [1]. The pressure system is described in details as well as the data acquisition process and system metrological validation is provided; furthermore, some results obtained during a wind tunnel campaign carried out at Politecnico di Milano Wind Tunnel, as a benchmark of the whole measuring system for future full scale application, are reported and discussed in details. Moreover, the system configuration for full scale testing, which is still under development, is also described.

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Santolucito, Mark. „Version space learning for verification on temporal differentials“. In ISSTA '17: International Symposium on Software Testing and Analysis. New York, NY, USA: ACM, 2017. http://dx.doi.org/10.1145/3092703.3098238.

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Rastegar, Jahangir, Dake Feng und Carlos Pereira. „Self-Powered Event Detection Sensors With Integrated Safety Electronics for Initiation and Switching in Munitions“. In ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7693.

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A new class of self-powered acceleration event detection sensors are presented that are powered by electrical energy harvested during munitions launch by integrated piezoelectric elements. The sensors are provided with a novel safety electronic and logic circuitry that is used to differentiate the firing event from all accidental events such as accidental drops, transportation vibration, and the like. When the launch conditions are detected from the magnitude of the experienced acceleration as well as its duration, the remaining electronics and logics circuitry of the device is enabled. The developed self-powered sensors may also be used in place of G-switches in munitions and other industrial and commercial devices with the advantage of activating not only from the magnitude of the experienced acceleration but also from its duration. The latter capability is essential in many munitions and commercial applications to avoid false switching event. For example in some cases dropping of around over a hard surface may impart higher peak acceleration than actual firing. And in many industrial and commercial devices and equipment, high-G and very short duration shock loadings do not cause damage and G-switches used to deactivate the device may not be desired to trip. Prototypes of the developed piezoelectric-based self-powered event detection sensors as standalone sensors and as switches for detecting and opening or closing circuitry upon detection of shock or vibration loading with prescribed magnitude and duration thresholds with integrated electronics and logics circuitry have been designed, fabricated and successfully tested for a number of munitions and industrial applications. In this paper the design and operation of such devices and their testing are described.

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Richie, Aaron Paul, und Lannie Laroy Dietle. „Sealing Advancements for Rotating Control Devices“. In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31159-ms.

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Abstract Some of the most critical elements of a rotating control device (RCD) are the rotary seals that prevent a pressurized abrasive drilling fluid from destroying the rolling element bearings. The rotary seals prevent the drilling fluid from damaging the bearings by sealing the annular gap between the rotating mandrel and the stationary bearing housing. The combination of pressure causing seal material to bulge into the annular gap and the relative runout between the mandrel and housing can cause extrusion damage of the seal. The relative rotation and runout between the seal and mandrel in an abrasive environment leads to abrasive wear of the seal. Finally, the relatively high surface speed and contact pressure between the seal and mandrel leads to adhesive wear of the seal. When the drilling fluid pressure below the RCD is low there are several suitable rotary seal designs that can provide acceptable RCD life at most rotary drilling speeds. To meet higher speed and pressure conditions for the 100 hour minimum duration, established in API 16RCD, many RCD designs employ a sealing approach that splits the sealing tasks across two seals. One seal excludes the abrasive drilling fluid at low differential pressure and another seal, capable of operating at high differential pressure, retains a clean lubricant that is at nearly the same pressure as the drilling fluid. This sealing system generally requires an external lubricant pressurization system to provide the necessary fluid and pressure environment for the seals. Some drilling sites that operate at these conditions cannot accommodate these large, complex, expensive lubricant systems due to space or access constraints, or economic considerations. This paper describes an innovative sealing system that enables an RCD to operate at 1,500 psi and 100 RPM for 200 hours without requiring an external lubricant pressurization system. This claim is based on extensive laboratory testing of three new technologies included in this sealing system. Key results and summaries from the test program are included in this paper. The three key technologies are: A hydrodynamic spring-loaded lip seal that can be used to exclude abrasive drilling fluid at low-differential pressure or retain a clean lubricant at high differential pressure. A direct-compression hydrodynamic seal that can retain a clean lubricant at high differential pressure. A self-actuating miniature valve that replaces the lubricant supply function of an external lubricant pressurization system.

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Feenstra, Joel, Jonathan Granstrom und Henry A. Sodano. „Amplified Piezoelectric Stack Actuators for Harvesting Electrical Energy From a Backpack“. In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35813.

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Over the past few decades the use of portable and wearable electronics has grown steadily. These devices are becoming increasingly more powerful, however, the gains that have been made in the device performance has resulted in the need for significantly higher power to operate the electronics. This issue has been further complicated due to the stagnate growth of battery technology over the past decade. In order to increase the life of these electronics, researchers have begun investigating methods of generating energy from ambient sources such that the life of the electronics can be prolonged. Recent developments in the field have led to the design of a number of mechanisms that can be used to generate electrical energy, from a variety of sources including thermal, solar, strain, inertia, etc. Many of these energy sources are available for use with humans, but their use must be carefully considered such that parasitic effects that could disrupt the user’s gait or endurance are avoided. This study develops a novel energy harvesting backpack that can generate electrical energy from the differential forces between the wearer and the pack. The goal of this system is to make the energy harvesting device transparent to the wearer such that his or her endurance and dexterity is not compromised. This will be accomplished by replacing the strap buckle with a mechanically amplified piezoelectric stack actuator. Piezoelectric stack actuators have found little use in energy harvesting applications due to their high stiffness which makes straining the material difficult. This issue will be alleviated using a mechanically amplified stack which allows the relatively low forces generated by the pack to be transformed to high forces on the piezoelectric stack. This paper will develop a theoretical model of the piezoelectric buckle and perform experimental testing to validate the model accuracy and energy harvesting performance.

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Zhao, Fan, Delu Chen, Zhe Pu und Jielu Wang. „A New Research Method for Corrosion Defect in Metal Pipeline by Using Pulsed Eddy Current“. In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21322.

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Abstract Pulsed eddy current (PEC) is a new technique to distinguish corrosion defeats inside and outside the metal pipeline. In comparison with other eddy current techniques, the PEC technique has the advantage of being simple and high velocity. In this article, a brand-new PEC probe based on differential conductivity is established through the combination of modules like square wave generator, eddy current coil bridge, differential current, voltage sample circuits and so on. The 50% duty cycle square wave is used as the driving signal. To measure differential conductance, a coil bridge configuration with two legs is adopted. One leg is composed of measurement eddy current coil and the in-series resistor, and the other is reference eddy current coil and the in-series resistor. Because the two legs go through defects in pipeline non-synchronously, there is a differential conductance between the two coils. A trans-impedance amplify circuit is used to detect coil eddy current. At the same time, two amplifiers are used to measure the differential voltage between the two coils. A 14 bit ADC is used to sample differential voltage, measurement and reference eddy currents which transferred to differential current by main processor Complex Programmable Logic Device (CPLD). CPLD is used to get differential conductance by differential current divide differential voltage. At last the eddy current signal sampling sequence is developed. A dynamic testing fixture with artificial defects carved on the pipeline is used to validate PEC probe’s accuracy. The differential conductance signals were displayed on the oscilloscope. Results showed that the inside defect had two peaks, positive peak and negative peak, but the outside defect only had one positive peak. We can conclude that the brand-new PEC probe has high accuracy in distinguishing the inside and outside defects.

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Caguiat, Daniel E., Jennifer Connor, Edward Duckless und Richard J. DeCorso. „Inlet Air Salt Concentration Detection on U.S. Navy Ship Service Gas Turbine Generator Sets“. In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53984.

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The Naval Surface Warfare Center, Carderock Division (NSWCCD) Gas Turbine Emerging Technologies Code 9334 has been working, in conjunction with Vibro-Meter Incorporated, to evaluate and further develop the Vibro-Meter Flame Contaminant Detector (FCD). This device has been used on various commercial gas turbine platforms to quantify the level of sodium entrained in fuel. The FCD consists of a spectrometer device, fiber optic cabling, and a lens assembly, which is mounted in an open combustor port. The combustion flame is continuously monitored for sodium wavelength intensity during gas turbine operation. The FCD was initially of interest to NSWCCD for use in fuel filtration system health monitoring. However, based on known Ship Service Gas Turbine Generator (SSGTG) hot section corrosion issues, it was believed that the FCD would also serve as useful tool for quantifying inlet air salt concentration. Testing was performed at the Philadelphia Land Based Engineering Site in 2003. It was determined that the FCD was able to detect salt concentrations as low as 0.003 parts per million. Initial indications are that airborne salt can be differentiated from fuel entrained salt based on continuous vs. intermittent sodium levels. Continuing efforts are centered on optimizing the existing FCD algorithm to properly differentiate between and quantify inlet air and fuel-entrained salt concentration.

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Berichte der Organisationen zum Thema "Device for testing differentials"

Ye, Z., D. Finney, R. Zhou, M. Dame, B. Premerlani, B. Kroposki und S. Englebretson. Testing of GE Universal Interconnection Device. Office of Scientific and Technical Information (OSTI), August 2003. http://dx.doi.org/10.2172/15004477.

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Stanton, Brian C., Mary Frances Theofanos, Susanne M. Furman, John M. Libert, Shahram Orandi und John D. Grantham. Usability testing of a contactless fingerprint device: part 1. Gaithersburg, MD: National Institute of Standards and Technology, Dezember 2016. http://dx.doi.org/10.6028/nist.ir.8158.

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Stanton, Brian C., Mary Frances Theofanos, Susanne M. Furman und Patrick J. Grother. Usability testing of a contactless fingerprint device: part 2. Gaithersburg, MD: National Institute of Standards and Technology, Dezember 2016. http://dx.doi.org/10.6028/nist.ir.8159.

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Retsky, Michael. Testing a Display Device Invention for Digital Mammography Workstations. Fort Belvoir, VA: Defense Technical Information Center, Juli 2002. http://dx.doi.org/10.21236/ada415994.

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Mitkova, Maria, Darryl Butt, Michael Kozicki und Hugo Barnaby. Chalcogenide Glass Radiation Sensor; Materials Development, Design and Device Testing. Office of Scientific and Technical Information (OSTI), April 2013. http://dx.doi.org/10.2172/1082961.

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Kavianpour Isfahani, Zahra. Statistical Analysis of Stormwater Device Testing Protocols in Portland, Oregon. Portland State University Library, Januar 2000. http://dx.doi.org/10.15760/etd.676.

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Temple, Brian Allen, und David A. Pimentel. LANL12-RS-108J Report on Device Modeler Testing of the Device Modeler Tool Kit. DMTK in FY14. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1158829.

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Van Stryland, Eric W., und David Hagan. Optical Source for Organic and Polymeric Nonlinear Device and Material Testing. Fort Belvoir, VA: Defense Technical Information Center, Februar 1999. http://dx.doi.org/10.21236/ada379874.

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Johnson, Terry A., Staats, Wayne Lawrence,, Michael Thomas Leick, Mark D. Zimmerman, Reinhard Radermacher, Cara Martin, Dennis Nasuta, Paul Kalinowski und William Hoffman. Development and Testing of an Integrated Sandia Cooler Thermoelectric Device (SCTD). Office of Scientific and Technical Information (OSTI), Dezember 2014. http://dx.doi.org/10.2172/1165230.

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Horst, John, Thomas Kramer, Keith Stouffer, Joseph Falco, Hui-Min Huang, Frederick Proctor und Albert Wavering. Distributed testing of a device-level interface specification for a metrology system. Gaithersburg, MD: National Institute of Standards and Technology, 2002. http://dx.doi.org/10.6028/nist.ir.6851.

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