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Dissertations / Theses on the topic 'Electrical boards'
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Radojicic, Marko L. M. "Aspects of electromagnetic interference on printed circuit boards." Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5873.
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General guidelines for the design of printed circuit boards have been developed for two important aspects of electromagnetic compatibility: cross-talk and radiated emissions. Numerical methods were used to study the cross-talk between tracks of several common printed circuit board technologies. Design recommendations are suggested that minimize the cross-talk on printed circuit boards. A simple model was developed to predict radiated emissions from complicated circuits on printed circuit boards. The concepts of ground impedance and common-mode currents were used to build a model which gives fast and accurate predictions. The technique was tested using a method of moments program.
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Mata, Milton E. "MIDS universal interface for the selection of link 16 messages." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://sirsi.nps.navy.mil/uhtbin/hyperion-image/02Mar%5FMata.pdf.
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Williams, Harel M. (Harel Michael). "DomeView : community-based digital bulliten boards and mobile phone interaction." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42126.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.Includes bibliographical references (leaves 60-61).
Our thesis is that a networked public display/kiosk system, that provides information for a local community, functions best when it is decentralized and interactive. We deployed such a system at MIT that has two aspects, DomeView for distributed decentralized display and content distribution, and PhoneView for enhanced user consumption of that content. PhoneView is an implementation that we propose to solve a number of issues with current interactive public kiosk deployments, as well as enables scenarios of enhanced interactions. By using the Hands-Free Bluetooth profile as the basis for the communication between a mobile phone and a kiosk, we provide an enhanced personalized interaction for all passersby with Bluetooth-enabled mobile phones, without requiring the installation of custom software. Some examples include the ability to remotely control a kiosk, exchange calendar and contact data with the kiosk, and play games on a kiosk with other users via one's mobile phone. By removing the software installation barrier and providing new mechanisms of public interaction, this implementation is ripe for wide-spread and immediate adoption across multiple public kiosk platforms.
by Harel M. Williams.
M.Eng.
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Ghazizadeh, Ali. "Optimum mounting of electronic circuit boards for components and circuits survivability." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/6936.
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Electronic circuit boards are employed in demanding environments (e.g. satellite, aerospace, marine, automobile, etc.) where the board and mounted components are exposed to vibration of varying amplitude and frequencies. Optimum mounting and component placement to reduce the effect of vibration on the equipment may prolong the service life of the system and reduce costly down time. Electronic boards are often mounted on four rigid support legs. Their vibration is a function of the location of the support legs, and board physical specifications such as length, width, weight, and placement of the components mounted on them. In this study, plate vibration analysis is employed to find the board's free vibration. With the help of nonlinear optimization methods, optimum mounting of circuit boards are investigated. Square board has a better performance than any other board shape. A table of suitable support points will be introduced outlining optimum support points for eight rectangular shapes. For each of these shapes a graph of unsuitable regions is provided to help the designer to avoid placing delicate components over those regions of the plate. Furthermore, the tabulated results can eliminate the need for optimization in non-critical circuit boards or determine a good starting point for optimization. (Abstract shortened by UMI.)
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Strusevich, Nadezhda. "Numerical modelling of electrodeposition process for printed circuit boards manufacturing." Thesis, University of Greenwich, 2013. http://gala.gre.ac.uk/10214/.
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Printed circuit boards (PCBs) are used extensively in electronic products to connect assembled components within a system. The so-called vertical interconnect access (via) is a vertical hole or cavity in the PCB filled with metal to facilitate conductivity. The current trend, particularly for high technology products (e.g., 3D packaging), is to manufacture PCBs with high aspect ratio (AR) vias. Typically, the size of such a via is at the micrometer scale (this is why they are termed micro-vias). The most widely used technique for manufacturing micro-vias is electrodeposition of metal (e.g., copper), where the PCB is immersed into a plating cell filled with an electrolyte solution. Using standard conditions, electrodeposition usually does not produce micro-vias with the required quality. This is due to a lack of copper ion transport into the via. This has lead to studies of various ways of enhancing the ion transport. This thesis documents the results from a modelling study into the electrodeposition processes for fabricating high aspect ratio micro-vias. This includes basic electrodeposition and techniques that enhance ion transport such as forced convection (using a pump) and acoustic streaming (using transducers). In this work, a novel numerical method for explicitly tracking the interface between the deposited metal and the electrolyte is implemented and validated under the conditions of basic electrodeposition using experimental data. Results from a parametric study have established a set of design rules for micro-vias fabrication. When ion transport is enhanced by forced convection (e.g., pumping) in the plating cell, we apply a multi-scale modelling methodology that provides interaction between models at the macro level (the plating cell) and the micro level (the interior of a via). Numerical simulations can then be used to verify how ion transport into the micro-via is improved. These results can then be used to identify process conditions for the plating cell which will result in the required flow behaviour at the micro-via. Megasonic agitation can also be used to enhance electrolyte convection in the plating cell. This is achieved by placing megasonic transducers into the plating cell. This leads to several phenomena, one of which is known as the acoustic streaming. Models have been developed for predicting megasonic agitation both at the macro and micro-scales, and a number of designs have been investigated for both open and blind micro-vias.
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Cho, Sang-Yeon. "High speed optical interconnection on electrical boards using embedded OE devices in polymer optical waveguides." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/14881.
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Khan, Raouf Lawrence. "Finite element method applied to modelling electromagnetic interference and compatibility problems on printed circuit boards." Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5676.
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The finite element method is applied to compute the distributed capacitance and inductance matrices for multilayered dielectric, planar transmission media. The analysis involves the solution of the Laplace equation in two dimensions for multiconductor configurations in microstrip, triplate, or TEM Cell configurations of arbitrary cross section and utilizes a unique node allocation algorithm for automatic generation of the finite element mesh. The advantages, disadvantages, and difficulties encountered in application of the FEM for this problem are outlined and discussed. Several programs, based on multiconductor transmission line theory, are developed for application to Electromagnetic Interference and Compatibility (EMI/C) problems for crosstalk and radiated emission analysis. To verify the model experimentally, a simple printed circuit board consisting of five parallel conductors in microstrip configuration was constructed and measured in both time domain and frequency domains. Radiation model results are compared for a multiconductor configuration with numerical results obtained using the Numerical Electromagnetics Code (NEC) moment method program.
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Wei, Zishan. "Reliability quantification of printed circuit boards subjected to thermal and vibration loads." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/280758.
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Reliability quantification is one of the most important tasks in Reliability Engineering. During the design, development, and operational phase, this information can be very valuable to the product's designers, and users. The designers can use it to guide their design, find the design's weak points. Users can use it to setup maintenance plans and schedule. PCBs, as the major building block of electronic equipment, have been widely used in modern complex systems, such as aircraft, automotives, laptop computers, etc. Its reliability plays a vital role in the whole system's reliability. Thus, effective and accurate quantification of PCB's reliability becomes very essential to the whole electronic system's reliability quantification. Random vibration and thermal cycling are two common environments experienced by PCB's. As a result, quantifying the reliability of a PCB under these two environments becomes necessary. Currently, in industry, the commonly used methods to quantify the reliability of a PCB are the MIL-HDBK-217 and Bellcore type methods. However, the lack of accuracy and slow pace of updating the databases have limited the usage of these methods. In this dissertation, a Modified Stress-Strength Interference (MSSI) method is proposed to quantify the reliability of a PCB. In this method, not only the stress and the strength are assumed to be distributed, but also is the mean value of the strength, so that both the initial designed-in reliability and the reliability at any time can be quantified. Based on this method, a reliability quantification model for the PCB is developed. In this model, a PCB is divided into three parts: i.e., board, interconnects, and parts and modules mounted on the board. Seven (7) failure modes related to the board and the interconnects, and one (1) failure mode related to the module have been investigated. The dependence between these failure modes is studied and incorporated into the reliability quantification model. A three-step popcorn effect reliability quantification model is also proposed by means of considering the failure mechanism of the popcorn effect. Finally, a comprehensive example is given to demonstrate the usage of the methodology proposed in this dissertation.
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Aguirre, Gerardo 1960. "Methodologies for modeling radiated emissions from printed circuit boards and packaged electronic systems." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/282256.
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A two-step methodology for predicting the radiated fields from lines radiating in the presence of conductor-backed substrates is presented. The method employs the use of transmission line theory to find the current distributions on the lines forming the interconnects of a circuit. These currents are used to evaluate the far-fields of the circuit through the use of dipole theory and superposition. The method was tested and validated by comparison to full-wave models. Investigations established that radiation from common-mode currents, which are not accounted for by the circuit analysis, are found to be dominated by the radiation due to differential mode currents, and thus EMI prediction based on the two-step methodology is found to have good engineering accuracy. A full-wave method based on the Finite-Difference Time-Domain (FDTD) is presented for the evaluation of radiation from structures of such geometrical complexity that the transmission line model is not applicable. The Perfectly Matched Layer truncation scheme is implemented in the FDTD and investigated for radiating structures found in printed circuit boards (PCBs). Proximity effects of the PML dictate careful attention to the proper implementation of this absorbing boundary condition. Also, the FDTD subcell model for thin wires is investigated for modelling thin microstrip interconnect lines. To evaluate the far-fields from radiating structures found in multilayer electronic packages, a novel near-to-far field transform at a single frequency is developed and implemented for sources in stratified medium. This transform is validated and investigated with regard to PML and structure proximity. The near-to-far field transform is also implemented in a methodology for obtaining the radiated emissions from a radiating structure. This methodology is used to address important concerns regarding the grounding of heat sinks, "floating" conducting planes, and the electromagnetic behavior of split ground planes.
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Arkeholt, Simon. "Induction in Printed Circuit Boards using Magnetic Near-Field Transmissions." Thesis, Linköpings universitet, Teoretisk Fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148788.
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In 1865 Maxwell outlined the theoretical framework for electromagnetic field propagation. Since then many important developments have been made in the field, with an emphasis on systems using high frequencies for long-range interactions. It was not until recent years that applications based on short-range inductive coupling demonstrated the advantages of using low frequency transmissions with magnetic fields to transfer power and information. This thesis investigates magnetic transmissions in the near-field and the possibility of producing induced voltages in printed circuit boards. A near-field magnetic induction system is designed to generate a magnetic flux in the very low frequency region, and used experimentally to evaluate circuit board induction in several interesting environments. The resulting voltages are measured with digital signal processing techniques, using Welch’s method to estimate the spectrum of the received voltage signal. The results show that the amount of induced voltage is proportional to the inverse cube of the transmission distance, and that the system is able to achieve a maximum induced voltage of 65 \micro V at a distance of 2.5 m and under line-of-sight conditions. It is also concluded that conductive obstructions, electromagnetic shielding and background noise all have a large impact on the obtained voltage, either cancelling the signal or causing it to fluctuate.
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Asthana, Vikas. "Development of L-Band Down Converter Boards and Real-Time Digital Backend for Phased Array Feeds." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3162.
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Recent developments in the field of phased array feeds for radio astronomical reflector antennas, have opened a new frontier for array signal processing for radio astronomy observations. The goal is to replace single horn feeds with a phased array feed, so as to enable astronomers to cover more sky area in less time. The development of digital backend signal processing systems has been a major area of concentration for the development of science-ready phased array feeds for radio astronomers. This thesis focuses on the development of analog down-converter receivers and an FPGA-based digital backend for real-time data processing and analysis support for phased array feeds. Experiments were conducted with new receiver boards and both single-polarization and dual-polarization phased array feeds at the Arecibo Observatory, Puerto Rico and at the 20-meter telescope at Green Bank, WV, and results were analyzed. The experiments were performed as a part of a feasibility study for phased array feeds. The new receiver boards were developed as an upgrade to the earlier connectorized receivers as the number of input channels increased from 19 to 38 and space constraints arose due to the large size of the earlier receivers. Each receiver card has four independent channels on it. The receiver cards were found to have lower cross-coupling between the channels in comparison to the earlier receivers. The development of a FPGA-based real time digital backend focused on a real-time spectrometer, beamformer and a correlator for all the 64-channels using a x64 ADC card and ROACH FPGA boards. The backend can plot results in real time and can stream and store the data on the computers for purpose of post-processing and data analysis. The design process uses libraries and blocks provided by the Center for Astronomy Signal Processing and Electronics Research (CASPER) community.
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Accom, Gerald Charles. "An investigation of the learning processes that take place during practical work activities when using electrical circuit boards in grade: a case study." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1009687.
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Since the introduction of Outcomes Based Education (OBE) as a preferred method of teaching and learning with Curriculum 2005 in 1997, its existence has come under continuous threat for the past thirteen years. Its teething experiences included a revision in 2004 which saw the introduction of the Revised National Curriculum Statements (RNCS) and most recently, we are now standing on the threshold of the implementation of the Curriculum Assessment Policy Statements (CAPS) in 2012. Throughout the turbulent educational milieu, social constructivism has always been upheld as the preferred teaching and learning methodology and millions of rands have been invested in this regard. This study is thus premised on the concern that now after all the years of actively promoting social constructivist methodologies, the implementation of the CAPS could seriously negate reasonable strides made in this regard. Triggered by these curricular issues, a qualitative case study was conducted at a school in Grahamstown in the Eastern Cape, South Africa, investigating the learning processes occurring in group work sessions during lessons involving practical work in electricity using circuit boards in grade 8. Underpinned by an interpretivist paradigm, the study took place in two phases. The data was mainly generated through audio and video recording of two focus groups. An open coding system was employed to derive analytical categories and frequency tables were used to establish trends. In order to validate the data, two observer teachers were involved throughout the research process and this was followed up with semistructured interviews after the second phase. The two case studies, involving learners fitting a similar profile in respect of mother-tongue and age group, were engaged in a similar activity for almost a year apart. This study anticipated the revelation of the extent to which group practical activities in electricity promoted learning, how knowledge is constructed in group-settings and whether practical activities involving electrical circuit boards in grade 8 enhance learning? The main findings of my study revealed that these practical activities can promote learning and therefore should remain a preferred method of teaching.
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Mantena, Keerthi Varma. "Electrical and mechanical properties of MWCNT filled conductive adhesives on lead free surface finished PCB's." Lexington, Ky. : [University of Kentucky Libraries], 2009. http://hdl.handle.net/10225/1084.
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Thesis (M.S.)--University of Kentucky, 2009.Title from document title page (viewed on October 28, 2009). Document formatted into pages; contains: viii, 44 p. : ill. Includes abstract and vita. Includes bibliographical references (p. 42-43).
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Ström, Simon, and Ali Qhorbani. "Automation of the design process of printed circuit boards : Determining minimum distance required by auto-routing software." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-251925.
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This thesis project aims to create an overview of new technologies in printed circuit board manufacturing which when automated could become part of an Industry 4.0 production flow. Potential design limits imposed by new technologies are then applied in the creation process of a minimum distance estimation function. The intended purpose of this function is to correctly estimate the minimum distance required for the auto-routing software FreeRouting to be able to successfully route between two components. This is achieved by using a brute-force attack to progressively decrease the distance between components using a bisectional approach to find the minimum distance at which the auto-routing software can still successfully route for a specific design. Using the results from this brute-force attack a couple of linear functions based on different base designs are created and then used to implement a minimum distance function. The minimum distance estimation function is then intended to be used to implement limits to how close components can be placed to each other in a printed circuit board design tool which purpose is to enable people with lesser knowledge of printed circuit boards to still be able to realize their design ideas.Detta examensarbete ämnar skapa en överblick av nya tekniker inom mönsterkorts-tillverkning som när de automatiseras skulle kunna bli en del av ett Industri 4.0 produktionsflöde. Eventuella designbegränsningar som uppstår till följd av dessa tekniker kommer sedan appliceras i skapningsprocessen av en minsta avståndsfunktion. Syftet med denna funktion är att korrekt uppskatta det minimala avståndet som krävs för att auto-routing mjukvaran FreeRouting ska kunna dra ledningar mellan två komponenter. Detta görs genom en brute-force attackvinkel där avståndet mellan komponenter fortsätter minskas med bisektionsmetoden tills ett minsta avstånd hittats där auto-routing mjukvaran fortfarande kan dra ledningar för en specifik design. Genom användande av resultaten från denna brute-force attack skapas sedan ett par linjära funktioner baserade på olika bas-designer och dessa används sedan för att implementera minsta avståndsfunktionen. Denna minsta avståndet-funktion är sedan ämnad att implementeras som begränsningar för hur nära komponenter kan placeras varandra i ett program för design av mönsterkort vars syfte är att möjliggöra folk utan kunskaper inom mönsterkortsdesign att ändå kunna realisera sina designidéer.
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Loh, Poh Chiang 1973. "A universal flux/charge modulation strategy for three-phase power electronic converters." Monash University, Dept. of Electrical and Computer Systems Engineering, 2002. http://arrow.monash.edu.au/hdl/1959.1/8087.
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Miller, Richard H. "User interface design and evaluation of a shipboard electronic warfare console." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40148.
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Hubau, Agathe. "Conception d'un procédé de biolixiviation pour la valorisation des métaux contenus dans les déchets de cartes électroniques." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEC001.
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Parmi les différents types de déchets secondaires, les déchets électroniques représentent le flux de déchets dont la croissance au niveau mondiale est la plus forte. La récupération des métaux dans ces déchets est théoriquement plus efficace d’un point de vue énergétique que l’exploitation de gisements primaires. Cependant, la complexité de ces produits est telle qu’il n’est pas toujours possible de les insérer dans les chaînes de recyclage conventionnelles. La pyrométallurgie est le procédé le plus utilisé pour le raffinage des métaux contenus dans les circuits imprimés mais ce procédé de recyclage est très consommateur d’énergie et est réservé aux déchets à haute teneur en métaux précieux. Les procédés hydrométallurgiques sont moins coûteux et particulièrement flexibles. En particulier, l’utilisation de microorganismes permettant de catalyser les processus d’oxydation des métaux représente une alternative intéressante tant d’un point de vue économique qu’environnemental. Des études ont été menées sur la biolixiviation des circuits imprimés: d’un côté l’utilisation d’acides organiques et cyanure produits par des champignons ; de l’autre, l’utilisation de fer ferrique produit par des bactéries acidophiles, qui ne nécessitent pas de conditions stériles. L’étude de la biolixiviation des déchets de circuits imprimés par des bactéries acidophiles est l’objectif de la thèse. Pour ce faire, un procédé en 2 étapes en continu est mis au point. Différentes problématiques sont prises en compte : caractérisation et préparation des circuits imprimés ; influence du type de broyage ; adaptation des bactéries aux conditions spécifiques de la lixiviation ; rôle du fer ferrique, du pH et de la température ; besoins en O2 et CO2; mécanismes qui contrôlent la cinétique de mise en solution des métaux ; détermination des conditions physico-chimiques et biologiques. Cette thèse est réalisée à l’IRCP et au BRGM, en partenariat avec GeoRessources et est financée par la Chaire ParisTech Mines Urbaines soutenue par Eco-systèmesSpent Printed circuit boards (PCBs) are today raising attention because they contain almost 35% of metals including precious and strategic metals even at greater concentration than in primary resources (for instance, gold and copper are 25 to 250 times and 20 to 40 times more concentrated in spent PCBs than in ores, respectively). Consequently, spent PCBs are becoming a valuable resource, while the lack of an appropriate treatment could be a cause of environmental pollution. Today, high-grade PCBs are treated by pyrometallurgy to recover precious metals but many strategic metals are lost in the slag during this operation and the energy-cost of such processes is more and more disadvantageous. Therefore, the design of energy-efficient and cost-effective new processes capable to perform efficient metal recovery from PCBs is particularly important. Emerging techniques based on mechanical processes and hydrometallurgy appear as alternative solutions. In particular, biohydrometallurgy could be very promising. In the literature, few studies deal with the use of bioleaching for the treatment of spent PCBs by means of acidophilic microorganisms, which are mainly ferro and sulfo-oxidant. It allows the recovery of different metals such as Cu, Ni, Zn, etc. In the present study, a double-stage continuous bioreactor was designed to bioleach comminuted spent printed circuit boards (PCB) of low and medium grade. This work is performed at IRCP (Chimie ParisTech) and at the BRGM, in partnership with GeoRessources and is funded by the Chair ParisTech Urban Mines, supported by Eco-systemes
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Sarathy, Vasanth. "Physical modeling of electrical conduction in printed circuit board insulation." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34357.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.Includes bibliographical references (p. 297-301).
This thesis is concerned with understanding the degradation of electrical and electronic components in automobiles due to environmental effects. A special emphasis is placed on understanding the physical processes underlying the degradation, so that accelerated reliability tests can be specified with increased confidence of their validity. As a first case,printed circuit board (PCB) insulation was selected as a target for investigation. With an increase in the electronics and circuit miniaturization coupled with an increase in voltage in 42 volt as well as hybrid vehicles, PCB reliability has become an important issue. We first provide a broad presentation of insulation degradation theory as well as electrical conduction theory according to existing literature and then narrow our focus towards printed circuit board insulation. We develop a novel first-order mathematical model to describe electrical currents in printed circuit board insulation as a function of temperature, relative humidity, absorbed moisture content, voltage and geometrical characteristics. This model was developed from a series of experiments that were carefully performed under controlled laboratory conditions. In addition to describing the experimental procedure and results, we also explain the details of the experimental setup and measurement instrumentation. Furthermore, we present an intuitive physical explanations for some observations and model responses.
by Vasanth Sarathy.
S.M.
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Paakkolanvaara, J. (Janne). "ZYBO Zynq™-7000 Development Board käyttöönotto." Bachelor's thesis, University of Oulu, 2017. http://urn.fi/URN:NBN:fi:oulu-201708312777.
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Tässä työssä esitellään ZYBO Zynq™-7000 kehityskortin ominaisuuksia, komponentteja sekä käyttömahdollisuuksia. Käyttöönotto-ohje on tehty minimivaatimuksilla. Ohjauksessa esitellään monipuolisin tapa käynnistää lauta ja ohjelmoida siinä oleva FPGA. Tähän sisältyy Verilog-mallin, yksinkertaisen C-ohjelman, sekä bittisekvenssitiedoston luominen ja niiden syöttäminen ZYBO:lle. Tämän työn avulla luodaan pohja ZYBO:n käyttöönottoon selkeästi ja helpostiThis work presents the ZYBO Zynq™-7000 development board, what it includes, its components, and possible uses. The start guide is made with the minimum requirements. The guide will cover the most flexible way of powering up and programming the FPGA included. This includes a Verilog-design, a simple C-program, and the creation of a bitfile that is used to boot up the device. This work allows for a quick and simple way of starting with a ZYBO board
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Sakr, Nadim. "Fast on-board integrated chargers for electric vehicles." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC045.
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L'autonomie moyenne des voitures électriques commercialisées actuellement reste limitée par rapport aux véhicules thermiques. Pour pallier ce problème, la capacité de la batterie peut être augmentée ou bien la charge peut être facilitée en réduisant le temps de charge et ceci en augmentant la puissance de charge.L'infrastructure de charge rapide de type DC étant encore limitée, un progrès considérable consiste à embarquer le chargeur dans le véhicule en réutilisant tout, ou une partie de l'électronique de puissance déjà disponible pour propulser le véhicule. Le chargeur est alors nommé chargeur intégré.Au cours des dernières années, plusieurs chargeurs intégrés ont été proposés, mais peu d'entre eux ont été industrialisés vue qu'ils présentent des inconvénients que l'on cherchera à surmonter ou réduire.Dans le cadre de cette thèse notre objectif principal est donc de concevoir une nouvelle topologie de convertisseur permettant la charge de la batterie à moindre coût.Plusieurs idées permettant l'innovation sont proposées et une solution répondant au mieux au cahier de charges est retenue. Cette topologie est étudiée en détails (contrôle, dimensionnement, harmoniques, CEM, etc.). Finalement un prototype est réalisé pour valider le concept proposéTo date, the range autonomy of most electric vehicles is still lower than conventional fuel based vehicles and charging times are significantly longer. To overcome this problem, battery capacity could be increased but more importantly high power fast charging should be accessible everywhere.The widespread deployment of public DC fast charging stations is still difficult to achieve. So, in order to have a better spreading of the charge spots and a better coverage, it is also necessary for the vehicle to be charged from an on-board charger that could be plugged into three-phase AC power outlets.Furthermore, because the battery is charged only when the car is parked -except for regeneration at braking-, using the on-board traction system components to form an integrated charging device is possible. This kind of topology is called an integrated charger which allows designing a charger small enough to be embedded in a vehicle at an affordable cost.Several non-isolated on-board integrated charging topologies are proposed in this thesis and the one that best meets some predefined specifications is selected. This topology is studied in details and validated by simulation software. A laboratory prototype is also built to verify the performance of this multi-purpose traction/charger converter
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Булик, Михайло Олегович. "Контрольно-вимірювальна система для випробувань твердості компонентів медичних приладів." Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/30656.
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Магістерська дисертація має аналітичну та дослідну частини. В даній роботі було розглянуто і розроблено технічну документацію та створено дослідну модель автоматизованого приладу вимірювання твердості деталей, який має назву “Мікротвердомір М20-2”. Призначення автоматизованого приладу є вимірювання твердості деталей медичних приладів та систем із різних матеріалів. Та проведено лабораторні дослідження.The master's dissertation has analytical and research parts. In this work, the technical documentation was considered and developed and a pilot model of an automated instrument for measuring the hardness of parts, called "Microhardness meter M20-2", was created. The purpose of an automated device is to measure the hardness of parts of medical devices and systems made of different materials. Yes, laboratory tests were carried out.
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Chin, Victor Ernest. "Design of a 4x4 bidirectional routing board." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36082.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.Includes bibliographical references (leaf 44).
by Victor Ernest Chin.
M.Eng.
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Hassan, Abu S. M. (Abu Saleem Mahmudul). "Testing of board interconnects using boundary scan architecture." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74304.
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The testing of printed circuit board (PCB) interconnects is a complex task that requires enormous amount of resources. With the increasing use of new technologies like surface mounting technology (SMT), testing PCB interconnects using the available techniques, like in-circuit testing and functional testing, is becoming very difficult. To make testing manageable, it must be considered earlier in the design process. This is known as 'design for testability' (DFT). A hierarchical DFT approach known as boundary scan architecture has recently become an increasingly attractive solution for PCB interconnect testing problems. This framework provides a scan path for electronic access to the interconnect test points, thus removing the need for accessibility through electro-mechanical contacts known as 'bed of nails'.In the recent past, several researchers have proposed different schemes for PCB interconnect testing based on the boundary scan architecture.
In this dissertation, a new approach, based on the concept of built-in self-test (BIST), is developed using the boundary scan architecture for PCB interconnect testing. BIST, at the component level, generally consists of incorporating additional circuitry on the chip to generate test patterns and to compact the response of the circuit under test into a reference signature. For the PCB level BIST, the board is considered as the unit under test. A family of BIST schemes are developed for board interconnect testing utilizing the properties of the boundary scan architecture. The BIST approach has removed the dependence on automatic test equipment (ATE) for generation of test vector sets and analysis of output data sets. Techniques are developed for the generation of test vector sets which require very simple test generation hardware. Test vector sets are shown to be independent of the order of the input/output (I/O) scan cells in the boundary scan chain and of the structural complexity of the interconnects under test. Response compaction techniques proposed in the schemes are such that fault detection and diagnosis can be done independent of the topological information about the interconnects. These response compaction techniques can be implemented within each boundary scan cell or outside the boundary scan chain, providing a trade-off in terms of test time and hardware complexity. The various uses of the boundary scan architecture make the proposed schemes more attractive and advantageous than the existing approaches for board interconnect testing.
Moreover, a family of interconnect testing schemes is proposed for a partial boundary scan environment. Partial boundary scan environment refers to a board with a mix of boundary scan and non-boundary scan components. Such an environment is more complex compared to a complete boundary scan environment. The proposed schemes are BIST-able despite the inherently complex test environment. However, fault coverage is limited because of the reduced accessibility of the partial boundary scan environment.
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ALMEIDA, RENATA SILVA DE. "CORPORATE GOVERNANCE: ANALYSIS OF BOARD OF DIRECTORS COMPOSITION IN THE BRAZILIAN ELECTRICAL ENERGY SECTOR." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19570@1.
Full textAbstract:
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIORPROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
A composição dos conselhos de administração é um dos temas mais recorrentes em governança corporativa, uma vez que os conselheiros representam os mediadores no conflito de agência. O objetivo desta dissertação foi avaliar, no setor de energia elétrica, se a composição dos conselhos como tamanho, presença feminina, proporção de conselheiros independentes e diferentes indivíduos nos cargos de diretor executivo e presidente do conselho afetam o valor e o desempenho das empresas do setor. Com uma amostra de 38 companhias do setor no período de 2005 a 2010, os resultados das regressões em painel apontam que o tamanho do conselho de administração mostrou-se positivamente relacionado a valor e desempenho com a presença de uma faixa ótima de conselheiros. A independência do conselho também apresentou relação positiva com valor e desempenho. No entanto, não houve significância estatística para a variável de valor. A porcentagem de mulheres no conselho não apresentou relação positiva com desempenho e a presença de pessoas distintas nos cargos de diretor executivo e presidente do conselho de administração apresentou resultados contraditórios em relação a valor e desempenho.
Board of directors composition is one of the most common themes in corporate governance because directors represent the mediators in the agency conflict. The aim of this work was to analyze in the energy sector if the board composition such as board size, women participation, proportion of independent directors and different people in the positions of CEO and Chairman affect value and performance. With a sample of 38 companies from 2005 to 2010, the results of panel regressions show that board size was positive related to value and performance with an optimal range of directors. Board independence was also positive related with performance. There was no significant statistical relation to the value variable. Proportion of women in the boards was not positive related with value and performance and different people in the positions of CEO and Chairman showed contradictory results on value and performance.
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Liu, Chenxia. "Data collection framework for vehicular On-Board-Diagnostic systems." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/76987.
Full textAbstract:
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 53-54).
Most modern vehicles contain an On-Board-Diagnostic (OBD) system that can collect a wide range of system data from the vehicle. In aggregation, such data could be applied towards solving the problems of accident prevention, vehicular safety, and driving efficiency. In this paper, we describe our design and implementation of a distributed vehicular data collection framework for running applications that aggregate customized OBD data on demand. Our framework is low-capital, low-maintenance, and flexible enough to handle several types of data requests. In our evaluation, the framework achieves within 2% accuracy for data collection at 1-second interval when compared to an externally calculated benchmark. We also simulate data collection under non-ideal conditions and methodically characterize the drift of accuracy as total percentage of packet loss rises for different patterns of data loss; in our experiment, we conclude that for our sampled data, dropped blocks have the greatest impact on accuracy..
by Chenxia Liu.
M.Eng.
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Uzun, Birkan. "A multimodal Ouija board for aircraft carrier deck operations." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106388.
Full textAbstract:
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2016.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (page 47).
In this thesis, we present improvements to DeckAssistant, a system that provides a traditional Ouija board interface by displaying a digital rendering of an aircraft carrier deck that assists deck handlers in planning deck operations. DeckAssistant has a large digital tabletop display that shows the status of the deck and has an understanding of certain deck actions for scenario planning. To preserve the conventional way of interacting with the old-school Ouija board where deck handlers move aircraft by hand, the system takes advantage of multiple modes of interaction. Deck handlers plan strategies by pointing at aircraft, gesturing and talking to the system. The system responds with its own speech and gestures, and it updates the display to show the consequences of the actions taken by the handlers. The system can also be used to simulate certain scenarios during the planning process. The multimodal interaction described here creates a communication of sorts between deck handlers and the system. Our contributions include improvements in hand-tracking, speech synthesis and speech recognition.
by Birkan Uzun.
M. Eng.
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Royal, Apollos Derrell. "Multiple Input and Output Programmable Source Using ADMC401 DSP Board." MSSTATE, 2002. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11062002-081738/.
Full textAbstract:
There are many types of power sources that are used for many different applications. In this thesis, a programmable source is designed, built and tested. The programmable source is able to generate three-phase output signals from three different input voltage signals using the ADMC401 DSP board. The programmable source is unique in that it can reproduce any input signal and amplify the input signal. This is done by pulse-width modulation (PWM). The programmable source was designed with gate driver circuits, a motor controller, switches, filters, comparators and other electronic components. Thermal protection and applications for this programmable source are presented in this thesis. Also, test data taken when a squirrel cage induction motor was powered by the programmable source is presented.
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Vural, Aydin. "Fmcw Radar Altimeter Test Board." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/2/1219526/index.pdf.
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In this thesis, principles of a pulse modulated frequency modulated continuous wave radar is analyzed and adding time delay to transmitted signal in the laboratory environment performed. The transmitted signal from the radar has a time delay for traveling the distance between radar and target. The distance from radar to target is more than one kilometers thus test of the functionality of the radar in the laboratory environment is unavailable.
The delay is simulated regarding to elapsed time for the transmitted signal to be received. This delay achieved by using surface acoustic wave (SAW) delay line in the laboratory environment. The analyses of the components of the radar and the delay line test board are conducted.
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Peng, Lin. "Analysis of Lithium-Ion Battery Data Collected On-Board Electric Vehicles." Thesis, KTH, Kraft- och värmeteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-132169.
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In order to replace diesel energy in the transportation sector as well as to reduce the emission of green house gases (GHGs) and avoid air pollution for a sustainable future, electrification of vehicles is one of the most popular topics today. Plug-in hybrid electric vehicle (PHEV) technology is a promising technology for electrification of automobiles. It uses both internal combustion engine and electric motor for propulsion. The battery pack that propels the electric machine can be recharged from grid electricity and from kinetic energy converted from regenerative braking. In this thesis, field test data from a Volvo V70 prototype in a 2010 study by Volvo and Vattenfall (ETC, Volvo, Vattenfall, 2010) was analyzed with Matlab to give a better understanding of the usage of PHEVs and the performance of lithium-ion battery. Several conclusions were obtained in this thesis from the analyzed data. It was found that average and maximum driving speed in Diesel Mode is faster than that in Electric Mode. Different drivers had different preference of driving speed. Driving distance vary in different months; longer distance was running under Diesel Mode; A considerable number of 370 kg carbon dioxide emission was saved by using electric energy instead of diesel energy for the studied car during one year. Battery performance in cold temperature conditions needs to be considered and the vehicle was switched to Diesel Mode from Electric Mode when SOC falls below 30%.
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Nygren, Frida. "Studies of electric vehicle charging with on-board photovoltaic power production." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-228410.
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Hickam, James William III 1956. "Paperless planning in printed circuit board manufacturing." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277250.
Full textAbstract:
One of the aspects of Computer Integrated Manufacturing is the ability to provide current work instructions to the operator at their workstation on a terminal or graphic monitor. The problem is, today, paperless planning is displayed to the operator one page at a time, making the operator report the completion or not completion of that task before showing the next page. This allows the operator no freedom of choice in how to do the job, which leads to reduced productivity and quality. A possible solution is presented by structuring the planning instructions and enhancing the workstation. The operator can be allowed to do the work the way he or she feels the most comfortable and yet, ensure the work is done according to design requirements.
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Bergström, Kristoffer. "Sensor system for automated circuit board testing." Thesis, Uppsala universitet, Signaler och System, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-388628.
Full textAbstract:
This thesis investigates the possibility to automate testing of PCBs with a sensor system. This PCB testing is today done manually by placing PCBs in a test fixture that determines its condition. This test requires an operator to wait for the test to complete and then place the PCB in the correct section. If this process can be automated time could be saved and the risk of mishandling PCBs could be reduced. A sensors system is made that consists of an Arduino with micro switches, hall effect sensors, a scanner and a LiDAR. The sensor system is designed to achieve a set of requirements that is needed for automation. The sensor system is meant to communicate with a robot that moves the PCBs within a test environment. This test environment is also designed in this project. For the system to communicate with a robot a program is made to inform the robot about placement of PCBs within the test environment. The final system is able to achieve the requirements set for automation but further investigation is needed to make this into a fully scaled automated system.
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Ghanta, Praveen 1978. "The effects of message board information dissemination on stock activity." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80538.
Full textAbstract:
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.Includes bibliographical references (leaves 74-75).
by Praveen Ghanta.
S.B.and M.Eng.
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Acquah, Kojo (Kojo F. ). "Towards a multimodal Ouija Board for aircraft carrier deck operations." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100330.
Full textAbstract:
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (page 70).
In this thesis, I present DeckAssistant, a novel interface for planning aircraft carrier deck operations. DeckAssistant is an intelligent, multimodal aircraft carrier Ouija Board. DeckAssistant's design is inspired by traditional Ouija Boards, featuring a large digital tabletop display with a scale model of an aircraft carrier deck and aircraft. Users plan aircraft operations by using this interface to mock situations on deck. Unlike traditional Ouija Board technology, DeckAssistant is designed to contribute to the planning process. We enable DeckAssistant with a basic understanding of deck operations and add multimodal functionality to our system. Users manipulate our model of the deck by issuing commands using speech and gestures. The system responds to users with its own synthesized speech and graphics. The result is a conversation of sorts between users and the Ouija Board as they work together to accomplish tasks.
by Kojo Acquah.
M. Eng.
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Verrinder, Robyn A. "Design and construction of a vibration data logging prototype board for overland conveyor belts." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/5092.
Full textAbstract:
Includes bibliographical references (p. 124-131).Overland conveyor belt systems form a vital part of modern transportation systems in the mining and mineral processing industries. It is vital that the system is well maintained in order to minimise system downtime and maximise profit. The conveyor belt is the single most expensive item in the system. It must be monitored to pick up potential problems before they cause belt failure. The majority of conveyor belt monitoring methods identify belt failure events rather than belt failure causes. The purpose of this project was to research and design a belt condition monitoring board which could be physically embedded in the conveyor belt. This would then be used to monitor the condition of the conveyor idlers whose failure can result in major system damage. The venture was split into two areas of research: the design of a vibration data logging board and the design of a power generation system. The thesis focused on the design of a DSP vibration data logging prototype board, while S.A. Williams investigated the design of a power generation system.
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Mswane, Luke Mdumiseni. "Lightning performance improvement of the Swaziland Electricity Board transmission system (66kV & 132kV lines)." Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/5152.
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Moissis, Elias D. (Elias Daniel). "A description and simulation of a printed-circuit board manufacturing plant." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14593.
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Gill, Gary W. (Gary William). "Tektronix solid ink printer print head drive board cost reduction project." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/45493.
Full textAbstract:
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.In title, the abbreviation for "Trade Mark" appears after the work Tektronix on t.p.
Includes bibliographical references (leaf 105).
by Gary W. Gill.
S.B.and M.Eng.
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Guidi, Giuseppe. "Energy management systems on board of electric vehicles, based on power electronics." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-5270.
Full textAbstract:
The core of any electric vehicle (EV) is the electric drive train, intended as the energy conversion chain from the energy tank (typically some kind of rechargeable battery) to the electric motor that converts the electrical energy into the mechanical energy needed for the vehicle motion. The need for on-board electrical energy storage is the factor that has so far prevented pure electric vehicles from conquering significant market share. In fact electrochemical batteries, which are currently the most suitable device for electrical energy storage, have serious limitations in terms of energy and/or power density, cost and safety. All those characteristics reflect in pure electric vehicles being outperformed by standard internal combustion engine (ICE) based vehicles in terms of driving range, time needed to refuel and purchase cost. Electric vehicles do have their distinctive advantages, being intrinsically much more efficient, operating at zero emissions at the pipe, and offering a higher degree of controllability that can potentially enhance driving safety. No wonder then, that electric energy storage technology has attracted considerable R&D investments, resulting in new traction battery packs that are getting closer and closer to the industrial targets. In this scenario of EV technology gaining momentum, power electronics engineers have to come up with newer solutions allowing for more efficient and more reliable utilization of the precious on-board energy that comes in a form that cannot be directly utilized by the motor. At present, most of the research in the area of power electronics for automotive is focused in volume and cost reduction techniques. The increase in power density is pursued by developing components that can be operated at higher temperature, thus relieving the requirements on cooling. In this thesis, the focus is on the development of alternative topologies for the power electronics converters that make use of some peculiarities of the energy storage components and of the electrical drive train in general, rather than being a mere component-level optimization of well established topologies. A novel converter topology is proposed for hybridization of the energy source with a supercapacitor-based power buffer being used to assist the main traction battery. From the functional point of view, the topology implements a bidirectional DC/DC converter. Making use of the fact that the battery terminal voltage is close to constant, an arrangement for the supercapacitors is devised allowing for bidirectional power flow by using power electronics devices of lower ratings than the ones needed in conventional DC/DC converters. At the same time, much smaller magnetic components are needed. Theoretical analysis of the operation of the proposed converter is given, allowing for optimized design. A full-scale experimental prototype rated at 30 kW, intended for use in a pure EV, has been built and tested. Results validate the theory and show that no particular impediment exist to the deployment of the concept in practical applications. Another concept introduced in the thesis is an architecture where the traction inverter is embedded in the energy storage device. The latter is constituted by several modules, as in the case of modern Li-ion battery systems, and each module is equipped with a local power electronics interface, making it functionally equivalent to a controllable voltage source. The result is a modular, distributed system that can be engineered to have very high reliability and also to exhibit self-healing properties. A prototype with a minimum number of modules has been built and tested. Results confirm the effectiveness of the system, and make it a good candidate for deployment in applications where reliability is the most important requirement.
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Radji, Moufid. "Microfabrication and post-CMOS integration techniques for a reconfigurable wafer-sized circuit board." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=92299.
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The WaferBoard(tm) rapid prototyping platform for electronic systems is proposed as a tool to help meet today's tight delivery time, performance and reliability constraints. At the core of WaferBoard(tm) is the WaferIC(tm), a wafer-scale reconfigurable CMOS circuit. At the surface of this complex circuit is a sea of identical contacts, any pair of which can be interconnected through a mesh grid network called WaferNet(tm). The user can simply deposit packaged integrated circuits on the smart active surface, and then a complex interconnect pattern between these ICs can be established in a matter of minutes. As is the case with development of any novel technology, design of the platform poses several technical challenges. Some of the postprocessing and integration tasks to be accomplished on the CMOS wafer are laid out hereafter. Firstly TSV etching was studied in depth and optimized to obtain vias of aspect ratio up to 15:1. Then the processing of a 0.18μm CMOS TestChip fabricated to validate the WaferIC(tm) concept on a 1/100th scale is outlined. Topside processing is then investigated with the characterization of Anisotropic Conductive Films leading to the choice of an ultra-high fiber density Z-Axis film attached in a novel unbonded manner.Le WaferBoard(tm) de DreamWafer qui permet de prototyper rapidement des systèmes électroniques est un outil proposé pour répondre aux contraintes de développent grandissantes de nos jours. L'objectif du WaferBoard(tm) est de réduire le temps à la commercialisation et de prototypage, tout en augmentant la fiabilité et la performance des innovations microélectroniques. Au coeur du WaferBoard(tm) se trouve le WaferIC(tm), un circuit CMOS à la taille d'une gaufre. A la surface de ce circuit complexe, un très grand nombre de points de contacts identiques est présent; n'importe quelle paire de ces points peut être interconnectée grâce aux mailles du réseau appelé WaferNet(tm). L'utilisateur peut simplement déposer ses circuits intégrés emcapsulés sur la surface active intelligente qui peut créer un réseau complexe d'interconnections entre les puces en l'espace de quelques minutes. Le développent de la plateforme présente de nombreux défis, comme c'est le cas avec toute nouvelle technologie. Certaines des tâches de post-traitement et d'intégration accomplies sur la gaufre CMOS sont détaillées ci-après. Dans un premier temps, une étude détaillée de la gravure de TSV est fournie, cette dernière est optimisée afin d'obtenir des vias ayant un rapport d'aspect de 15 pour 1. Le traitement d'un CircuitTest CMOS, 0.18μm fabriqué pour valider le concept WaferIC(tm) à une échelle d'un centième est aussi exposé. Sur le dessus de la gaufre, une caractérisation détaillée de films ACF est conduite, pour en fin de compte choisir un film d'ultra-haute densité installé d'une manière innovatrice (déposé sans être attaché).
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Tilly, John G. (John Gilbert) 1978. "Making handheld divices smaller : a boost converter that uses minimum board space." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/86729.
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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.Includes bibliographical references (leaves 68-69).
by John G. Tilly.
M.Eng.
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Lee, Chun-ming Angus, and 李俊明. "Reduction of electromagnetic interference due to electric field coupling on printed circuit board." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B29957709.
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He, Weiping. "Characterizing near-field circuit board radiation using crossed electric and magnetic dipole sources." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2010. http://scholarsmine.mst.edu/thesis/pdf/He_09007dcc807256ca.pdf.
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Thesis (M.S.)--Missouri University of Science and Technology, 2010.Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed Dec. 23, 2009). Includes bibliographical references (p. 60).
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Lee, Chun-ming Angus. "Reduction of electromagnetic interference due to electric field coupling on printed circuit board /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23501674.
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Gilbert, Marcus-Alan. "The design and implementation of an I/O controller for the 386EX evaluation board." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37782.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.Includes bibliographical references (p. 58-60).
by Marcus-Alan Gilbert.
M.Eng.
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Aliyu, Attahir Murtala. "On-board health monitoring of power modules in inverters driving induction motors." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/40123/.
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This thesis presents an on-board methodology for monitoring the health of power (converter) modules in drive systems. The ability to keep regular track of the actual degradation level of the modules enables the adoption of preventive maintenance, reducing or even eliminating altogether the appearance of failures during operation, significantly improving the availability of the power devices. The novelty of this work is twofold: the complete system that is used to achieve degradation monitoring; combining the heating technique (to obtain thermal transient) and the measurement without additional power components such as IGBT, MOSFETS, which affects the reliability, power density and complexity. The only additional component is an analog measurement circuit, which can be integrated into the gate drive board. The test routine is carried out during non-operational periods and idle times. Trains are used as a case study, where checks for degradation are made when the train is not in use, such as at the end of the day, after daily operation or at the start before daily operation and other non-operational periods. It is important to keep the train at standstill while tests are carried out. Hence a methodology to heat the devices with current from the input supply while keeping the motor load at a stand-still is presented. Experimental results obtained from this show that it is possible to implement an on-board health monitoring system in converters which measures the degradation on power modules. The work uses the concepts of vector control heating and structure function to check for degradation. It puts forward a system that is used on-board to measure the cooling curve and derive the structure function during idle times for maintenance purposes. The structure function is good tool for tracking the magnitude and location of degradation in power modules. Vector control gives the advantage of controlling the motor with field current and torque current (similar concept to DC motors).
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Barnard, Arno. "Feasibility of using an ARM processor in a micro satellite on-board computer." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52270.
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Thesis (MScEng)--University of Stellenbosch, 2001.ENGLISH ABSTRACT: After SUNSAT was launched in 1999 and the possibility of developing another micro satellite emerged, areas of possible improvement were identified. Among the suggestions that emerged was the idea of developing an on-board computer for a micro satellite, using one of the new generation low power processors. The processor had to meet guideline specifications derived from the experience gained by researchers and students involved with the SUNSAT project. This thesis covers the process of choosing one of these processors and the subsequent testing of the feasibility of using it in an on-board computer. The feasibility test included comparing the processor's specifications to those required and designing an evaluation board for this processor to test its ease of use and programmability.
AFRIKAANSE OPSOMMING: Nadat SUNSAT in 1999 gelanseer is en die moontlikheid vir die ontwikkeling van In soortgelyke satellite ontstaan het, is areas vir verbetering op bestaande stelsels geidentifiseer. Die idee om In nuwe generasie verwerker met lae kragverbruik as In aanboord rekenaar te gebruik, was een moontlikheid wat ondersoek moes word. Die verwerker moes aan riglyne gemeet, word wat afgelei is uit die ondervinding wat deur navorsers en studente tydens die SUNSAT projek opgedoen is. Die tesis dek die proses wat gevolg is om In verwerker te kies en die daaropvolgende toetsing om die bruikbaarheid van die verwerker as In aanboord rekenaar te bepaal. As deel van die toetsing is die verwerker se spesifikasies teen die verlangde spesifikasies opgeweeg, en In evaluasiebord is ontwikkel om die gemaklikheid van die gebruik en programmering van die verwerker te bepaal.
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Vos, Jacu. "Feasibility of the PowerPc 603ETM for a LEO satellite on-board computer." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52844.
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Thesis (MScEng)--University of Stellenbosch, 2002.ENGLISH ABSTRACT: For space designs, just as for terrestrial applications, the appetite for more computing power is virtually insatiable. Further, like portable applications, space use implies severe power constraints. Among currently available commercial processors, the PowerPC family ranks high in Million Instructions Per Second (MIPS) per watt, but its suitability for space applications outside low-earth orbits (LEOs) may be limited by the radiation environment, particularly single ev nt effects (SEE). This thesis covers the feasibility of using the PowerPC 603e™ processor for LEO satellite applications. The PowerPC architecture is well established with an excellent roadmap, which makes for a baseline microprocessor with long-term availability and excellent software support. The evaluation board design leverages Commercial Off-The-Shelf (COTS) technologies, allowing early integration and test. It provides a clear path to upgrades and provides a high performance platform to suit multiple missions.
AFRIKAANSE OPSOMMING: Die soeke na rekenaars met hoer werkverrigting sal nooit ophou rue. Dit geld vir beide rekenaars op aarde as satelliet aanboord rekenaars. Rekenaars vir ruimte gebruik word ook streng drywingsbeperkings opgele. Die PowerPC familie vergelyk baie goed met ander verwerkers, maar hul bruikbaarheid vir ruimte toepassings kan dalk beperk word tot lae wentelbane waar die ruimte radiasie omgewing meer toeganklik is. Die skrywe behandel die bruikbaarheid van die PowerPC 603e verwerker vir lae wentelbaan satelliet gebruik. Die welgestelde argitektuur, bekombaarheid en uitstekende sagte- _ ware ondersteuning verseker 'n standvastige fondasie. Kornmersiele komponente het voorkeur geniet in die hardeware ontwerp wat spoedige ontwikkeling sowel as aanpasbaarheid verseker. Die ontwerp bied 'n hoe werkverrigting en maklik opgradeerbare oplossing vir 'n groot verskeidenheid gebruike.
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Kent, Fraser C. "Ion exchange demineralisation for recycling of flowing rinse wastewater within printed circuit board manufacturing." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26381.
Full textAbstract:
In the last fifty years the electronics industry experienced substantial growth. During this period of growth technologies for manufacturing printed circuit boards, the heart of most electronics, have evolved continually. These improvements include many environmentally conscious innovations within the manufacturing process. Flowing rinse systems are an essential part of the manufacturing process. These flowing rinse baths utilize a very large amount of water. Environmental benefits and economic gain can sometimes be achieved through recycling the flowing rinse effluent for reuse.
Ion exchange is a conventional water treatment technology that is well suited to the application of recycling flowing rinse water from circuit manufacturing processes. This is due to the dilute nature of the solutions as well as the high proportion of ionic constituents that must be removed. Specifically, ion exchange demineralisation holds the capacity to treat flowing rinse water to a high purity allowing optimal rinsing efficiency and continual reuse of the same water.
Experiments were undertaken, using a variety of ion exchange demineralisation setups and materials to prove that this technology will work for a specific application at an Ottawa circuit board manufacturer. A series of experimental runs were performed leading to the conclusion that ion exchange demineralisation is effective for the recycling of this manufacturer's flowing rinse wastewater.
The Serfilco MBD-10 mixed bed resin showed the best performance although, being a mixed bed resin, it is not readily regenerated leading to a high operating cost of approximately $8.65/m3 of water treated. It is expected that a two-bed system with the same type of resins (strong acid and strong base) would have the capability of treating the same water to an acceptable level at a much lower cost and this type of set-up is recommended for future work. It was demonstrated that chelating strong acid resins such as the ones used in some of the experiments are not effective for demineralisation.
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Chun, Sungjun. "Methodologies for modeling simultaneous switching noise in multi-layered packages and boards." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15452.
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