Dissertations / Theses on the topic 'Digital control development'
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Slater, Howard James. "Real time emulation environment for digital control development." Thesis, University of Newcastle Upon Tyne, 1997. http://hdl.handle.net/10443/925.
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Simulation is a powerful tool for developing electric drive systems. Simulations allow the designer to experiment with control algorithms and hardware systems in a safe environment. To this end simulation is becoming increasingly popular. On'-line simulation does have its limitations in that the controller developed during the simulation period has eventually to be transferred to the target processor which will operate in the actual drive system. If, however, a real-time simulation environment could be realised, then the actual controller running in the actual target processor could be included in the simulation. Therefore no translation of code would be required once the controller had been developed and tested within the simulation. This would obviously lead to a reduction in development time and eliminate any possibility of introducing errors due to the translation between the simulated and actual controllers. This thesis describes the development of such a system using a multiple digital signal processing environment. The real-time simulated drive is operated in parallel with an experimental drive to allow a direct comparison between the two. The ability of the multiple processing system to operate in real-time has allowed the whole concept of simulation to be taken a stage further by the development of a real-time power level simulator. This simulator is capable of emulating a machine and load in real-time with real level of voltage and current. It is designed to replace a real machine during the development and testing stages of drive manufacture. This Virtual Machine is a controllable source/sink which is driven by the real-time simulation, and because of this the Virtual Machine takes on the characteristics of any choice of model within the real-time simulation. Moreover, because of its ability to handle bi-directional power flow, the Virtual machine can be programmed to emulate motors or generators. The Virtual Machine also includes the emulation of loads, thus making it extremely flexible and of interest to applications such as machine tools, electric vehicles, and wind generators, to name but a few.
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D'Amelio, Jeffrey David. "Development of a Digital Controller for Motor Control Experiments in the EE472 Lab." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1339.
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A digital motor controller for student lab use is designed, built, and tested. The controller uses an encoder for position measurement, and an H-bridge to drive the electromechanical plant.
A user interface is created to enhance usability of the device. The user interface is able to display key parameters of the control algorithm as well as the state of the system. It is also used to modify the gains and sample rate of the control algorithm.
The design of the system is refined, and 10 units are built for the EE472 Digital Controls Lab. The lab manuals for the first 4 experiments are revised to match and support the new system.
The possible future for the project is described with some suggestions for improving the system.
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Doonan, Andrew Francis. "The development, evaluation and implementation of true digital control." Thesis, Durham University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361882.
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Luo, Gang. "Development of a Digital Desk for Power Plant Control Room Operators." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-62353.
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Multi-touch technology and digital tabletops have been used in different fields. They provide a natural way of interaction with computers through gestures. In this report, we present a digital desk for power plant control rooms aimed at visualizing the power grid status. The thesis reports about the development of this desk that comprised field studies, use cases and requirements identification, low fidelity prototyping, and software development. A final evaluation of the design indicated that digital tabletops can be valuable for control room operators since they can enhance learning and communication among the collaborating operators. The work was done at ABB Corporate Research in Sweden.
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Ariga, Eiji, Shigeki Ito, Shizuhiko Deji, Takuya Saze, and Kunihide Nishizawa. "Development of dosimetry using detectors of diagnostic digital radiography systems." American Association of Physicists in Medicine, 2007. http://hdl.handle.net/2237/8818.
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Jooste, Charl Roelof. "Development of a generic digital controller for power electronic applications." Thesis, Cape Peninsula University of Technology, 2011. http://hdl.handle.net/20.500.11838/2210.
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Thesis (MTech (Electrical Engineering)))--Cape Peninsula University of Technology, 2011.This thesis presents an investigation into the generic tools, hardware and firmware, involved in power electronic converter control and feedback. The aim was to determine the optimal controller architecture through research of existing controllers. As soon as the architecture was established, design of the controller commenced. Explanations for the various components selected were provided. The design considerations when designing a printed circuit board (PCB) with mixed signals was also presented. The theory behind the control of a multicell converter as well the practical implementation of the control scheme in firmware was presented.
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Yuan, QingHui, and Aaron Jogada. "Architecture, Control and NVH Development of Digital Hydraulics for Off-Highway Vehicle Applications." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199396.
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Digital hydraulics is one of promising technologies having a huge potential to significantly improve energy efficiency in the fluid power industry. In this paper, we present a digital hydraulics solution for mobile market with a large ammount of energy usage by hydraulic components and systems. Specifically, a novel hydraulic architecture, Multiplex Digital Valve (MDV) system that employs digital valves to meet multiple service pressure/flow requirement in off highway vehicles, is introduced. With MDV being integrated in an execavator, signficant hydraulic power saving have been validated compared to the baseline machine with the negative flow control (NFC) architecture. In addition, considering noise is still a critical hurdle for digital hydraulics to be adoped, we develop several noise reduction methods that have been evaluated in simulation environment and implemented in the above MDV. The sound pressure measured from the retrofitted MDV solution with the NVH treatment in the excavator has been improved signficantly over the untreated system such that it is nearly comparable to the baseline machine. The paper also briefly presents the sound quality study for better understanding of human perception and acceptance to nonconventional sound.
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Merz, Paul V. "Development and testing of the digital control system for the Archytas Unmanned Air Vehicle." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1992. http://handle.dtic.mil/100.2/ADA261656.
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Nsumbu, Cassandra Daviane. "Development of a soft-core based power electronic conversion controller." Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/2379.
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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2014.The application of digital control techniques has become dominant in power electronics owing to several advantages they present, when compared to analogue solutions. Their development is based on the use of microprocessors and microcontrollers, such as Application Specific Integrated Circuit (ASIC), Digital signal processors (DSP), Field Programmable Gate Arrays (FPGA), or a combination of these devices. This thesis presents an investigation of a soft-core based FPGA control system as a solution for power electronic applications. The aim was the development and implementation of a conversion controller, which purpose is to supply control inputs in the form of digital Pulse Width Modulation (PWM) signals, to a number of power electronic applications, such as single half and full bridge DC-DC converters, three phase and multicell inverters. The PWM control technique is achieved via their power semiconductor switching devices. These PWM control signals are necessary for the high frequency conversion of an analog input voltage (AC, DC or unregulated) to an analog output voltage of another level (AC or DC). This was intended to be achieved by exploiting and combining the advantages that FPGA and embedded processors provide such as high reconfigurability and multipurpose ability. This controller’s digital outputs, namely PWM switching signals, can be directly delivered to an analog signal amplification circuit to create an adequate voltage level before being processed by the converters’ switches.
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Uddin, Md Mehrab. "Development of Advanced Process Control for Controlling a Digital Twin as a Part of Virtual Commissioning." Thesis, Högskolan i Gävle, Elektronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-37079.
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Over the last few decades, the complexity and variety of automation systems have increased dramatically. Commissioning has grown more and more critical for the entire industry. Conventional commissioning is time-consuming and expensive. It's always been a challenge in manufacturing to put new designs into production or implement new technologies, control codes, or tactics. In Virtual Commissioning (VC), control programs of the physical system's Digital Twin (DT) can be validated in Software-in-the-Loop (SIL) before the actual commissioning. The emergence of new VC tools and methods has become a tremendous advantage, bringing the values of shorter duration, flexibility, and lower risks to the commissioning process. In this thesis, advanced process control was developed using the software Matlab and Simulink in conjunction with the engineering tools S7-PLCSIM Advanced and STEP 7 TIA Portal to conduct VC. A VC approach with four key steps is taken to evaluate the possibility of validating advanced process control. The steps are modeling DT of a rolling mill, model-based control design, simulation model development in Simulink, communication between the simulation model and the PLC program using S-7 TIA Portal, and PLCSIM Advanced. Also, a simulated Human-Machine Interface was designed to operate and visualize the process. VC of the rolling mill process was verified and validated by Model-in-the-Loop (MIL) and SIL simulation. The simulation gives satisfactory results as both MIL and SIL show identical outputs of the process.
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Fu, Minghua. "Development and evaluation of a robust and intelligent digital control system for a rotary blood pump /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487953204280546.
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Mbangeni, Litha. "Development of methods for parallel computation of the solution of the problem for optimal control." Thesis, Cape Peninsula University of Technology, 2010. http://hdl.handle.net/20.500.11838/1110.
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Thesis (MTech(Electrical Engineering))--Cape Peninsula University of Technology, 2010Optimal control of fermentation processes is necessary for better behaviour of the process in order to achieve maximum production of product and biomass. The problem for optimal control is a very complex nonlinear, dynamic problem requiring long time for calculation Application of decomposition-coordinating methods for the solution of this type of problems simplifies the solution if it is implemented in a parallel way in a cluster of computers. Parallel computing can reduce tremendously the time of calculation through process of distribution and parallelization of the computation algorithm. These processes can be achieved in different ways using the characteristics of the problem for optimal control. Problem for optimal control of a fed-batch, batch and continuous fermentation processes for production of biomass and product are formulated. The problems are based on a criterion for maximum production of biomass at the end of the fermentation process for the fed-batch process, maximum production of metabolite at the end of the fermentation for the batch fermentation process and minimum time for achieving steady state fermentor behavior for the continuous process and on unstructured mass balance biological models incorporating in the kinetic coefficients, the physiochemical variables considered as control inputs. An augmented functional of Lagrange is applied and its decomposition in time domain is used with a new coordinating vector. Parallel computing in a Matlab cluster is used to solve the above optimal control problems. The calculations and tasks allocation to the cluster workers are based on a shared memory architecture. Real-time control implementation of calculation algorithms using a cluster of computers allows quick and simpler solutions to the optimal control problems.
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Klee, Andrew. "DEVELOPMENT OF A MOTOR SPEED CONTROL SYSTEM USING MATLAB AND SIMULINK, IMPLEMENTED WITH A DIGITAL SIGNAL PROCESSOR." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2870.
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This thesis describes an improved methodology for embedded software development. MATLAB and Simulink allow engineers to simplify algorithm development and avoid duplication of effort in deploying these algorithms to the end hardware. Special new hardware targeting capabilities of MATLAB and Simulink are described in detail. A motor control system design served to demonstrate the efficacy of this new method. Initial data was collected to help model the motor in Simulink. This allowed for the design of the open and closed loop control systems. The designed system was very effective, with good response and no steady state error. The entire design process and deployment to a digital signal processor took significantly less time and effort than other typical methods. The results of the control system design as well as the details of these development improvements are described.M.S.Cp.E.
Department of Electrical and Computer Engineering
Engineering and Computer Science
Computer Engineering
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Khakimbayev, Jasur S. "Development of integrated 3D terrain maps for Unmanned Aerial Vehicle (UAV) Flight and Mission Control Support System (FMCSS)." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FKhakimbayev.pdf.
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Thesis (M.S. in Modeling, Virtual Environments, and Simulation (Moves))--Naval Postgraduate School, March 2006.Thesis Advisor(s): Wolfgang Baer, Curtis L. Blais. "March 2006." Includes bibliographical references (p.99-101). Also available online.
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Magee, Warwick R. "Development of an electromagnetic actuator for active vibration control." Thesis, Queensland University of Technology, 1997.
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Abrahamsson, Petter. "User Interface Design for Quality Control : Development of a user interface for quality control of industrial manufactured parts." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79724.
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The expected quality on manufactured components in the automotive industry is high, often with an accuracy of tenths of a millimeter. The conventional methods used to ensure the manufactured components are very accurate, but they are both time consuming and insufficient and only a small part of the produced series are analyzed today. The measurement is performed manually in so-called measurement fixtures. Where each component is fixed and predetermined points of investigation are controlled with a dial indicator. These fixtures are very expensive to manufacture and they are only compatible with one specific kind of component. Nowadays, great volumes of material are scrapped from these procedures in the automotive industry. Hence, there is a great need to increase the amount of controlled components without affecting the production rate negatively. This project was carried out for the relatively new company Viospatia, which is a spin-off company based on research from Luleå University of Technology. They have developed a system that automatically measures each component directly at the production line with the use of photogrammetry technology. This makes it possible to discover erroneous components almost immediately and the manufacturer gets a more distinct view of their production and its capability. The aim of this thesis has been to investigate how a user interface should be developed to be as user-friendly as possible without limiting the system’s functions. The objective has been to design a proposal of a user interface adapted for the intended user, creating value and is easy to use. The progression has been structured around a human-centered approach expedient for interaction design, where the developing phase, containing analyze, design and validate, is performed through iterations with continuous feedback from users and the project’s employer. The context, where the intended solution is supposed to be used, was investigated through interviews and observations at the involved companies. In the project there were three factories involved, Gestamp Hardtech and Scania Ferruform in Luleå and Volvo Cars in Olofström. These factories are using similar production methods, sheet metal stamping, so their prerequisites and needs are similar for this type of quality control system. Creative methods have been applied throughout the project to generate as much ideas as possible while trying to satisfy all the important aspects. Initially analog prototypes were created but they were soon developed to digital interactive prototypes. A larger usability-test was conducted with seven participants by using a weblink to the digital prototype. With support from the feedback these tests generated some adjustments were made and the final user interface was designed, separated in two levels - Supervisor and Operator. Through extensive literature study and user-testing it became clear that the operator needs to get an unmistakable message from the user interface. There should not be any doubts whatsoever and the operator should react immediately. This message is delivered with the use of colors that have an established meaning. By identifying what needs the different actors have, the system’s functions can be separated and made accessible only for the intended user. The functions can then be more specifically developed for the intended user instead of modifying them trying to make a compromise that fits everybody. This separation of functions is not anything the user has to actively do but it is performed automatically by the user interface when the user is signing in.Den förväntade kvalitén på tillverkade delar inom bilindustrin är väldigt hög, med toleranser på så lite som tiondels millimeter många gånger. De konventionella metoderna som används för att kontrollmäta de tillverkade delarna idag är mycket noggranna, men de är både tidskrävande och otillräckliga och endast en väldigt liten del av en producerad serie blir kontrollmätt idag. Mätningen utförs manuellt i så kallade mätfixturer. Där varje komponent fixeras och förutbestämda undersökningspunkter kontrolleras med en så kallad mätklocka. Dessa fixturer är även väldigt dyra att tillverka och de är bara kompatibla med en specifik komponent. I dagens läge så kasseras otroligt stora mängder material från dessa komponenter inom bilindustrin. Här finns det alltså ett stort behov för att öka mängden komponenter som kontrolleras utan att påverka tillverkningstakten. Det här projektet utfördes åt det relativt nystartade företaget Viospatia, vilket är ett spin-off företag från forskning utförd vid Luleå tekniska universitet. De har utvecklat ett system som med hjälp av fotogrammetri automatiskt mäter av varje komponent direkt i produktionslinan. Detta gör att eventuella fel upptäcks nästan omedelbart samtidigt som tillverkaren får en tydligare bild av sin produktion och dess kapacitet. Syftet med denna masteruppsats har varit att undersöka hur ett gränssnitt bör utvecklas för att det ska bli så användarvänligt som möjligt utan att begränsa systemets viktiga funktioner. Målet har varit att ta fram ett förslag på ett gränssnitt som är anpassat för den tänkta användaren, som skapar ett mervärde och är enkelt att använda. Processen har följt en användarcentrerad struktur fördelaktig för interaktionsdesign, där utvecklingsfasen bestående av analys, design och validering sker i flera iterationer med kontinuerlig återkoppling med användare och uppdragsgivare. Kontexten, där den tänkta lösningen ska användas, undersöktes initialt hos de involverade företagen. I projektet var tre fabriker involverade, Gestamp Hardtech och Scania Ferruform i Luleå och Volvo Cars i Olofström. Dessa fabriker använder mestadels liknande tillverkningsmetoder, metallpressning, vilket gör att de rimligtvis har en del gemensamma förutsättningar och behov. Under arbetets gång har diverse kreativa metoder använts för att generera så mycket idéer som möjligt utan att förbise viktiga aspekter. Till en början utvecklades prototyper analogt för att sedan utvecklas till digitala interaktiva prototyper. Ett större användbarhetstest genomfördes på distans med sju testpersoner via en länk till den digitala prototypen. Med hjälp av responsen från dessa tester gjordes en del ändringar och den slutliga designen på gränssnittet blev uppdelat i två nivåer, Supervisor och Operator. Genom teoristudie och användartester framgick det att operatören behöver få en omisskännlig uppmaning från gränssnittet. Det bör inte uppstå några som helst tveksamheter och operatören skall kunna agera direkt. Denna uppmaning sker genom en tydlig färgkodning som utnyttjar vedertagna uppfattningar om färgers innebörd. Genom att identifiera vilka behov de olika aktörerna har kan man på så sätt också hålla isär de olika funktionerna och göra de tillgängliga endast för den typen av aktör som behöver de. De kan på så sätt också utvecklas mer specifikt för den tänkta aktören istället för att modifieras för att passa alla. Denna separering av funktioner är inget som användaren behöver ställa in själv utan görs automatiskt då den loggar in med sitt användarkonto.
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De, Beer Daniel Nel. "The development of an 8051 micro-controller evaluation and training board." Thesis, Cape Technikon, 1996. http://hdl.handle.net/20.500.11838/1095.
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Thesis MTech(Electrical Engineering)--Cape Technikon, Cape Town, 1996The development of the 8051 Evaluation and Training Board was in response to fulfill a need to have a training board available for students at the start of a micro-controller course. This board must be used to get hands-on experience in the internal architecture, programming and operation of the controller through the testing of sample programs and exercises. It can act as an example of a practical micro-controller application board, and also as part of, or as an aid in the design and application of own projects. The board had to be cheap enough so that each student can be issued with a personal board for the duration of the course. It had to be adequately selfsufficient to be portable and to operate independent of a host PC. In addition, it had to contain adequate "intelligence" to guide the student in the use of the board: have a quick re-programming turn-around cycle; and it must be possible to use the board for user program testing and debugging. After drawing up an initial set of objectives and investigating the economic viability of similar systems in industry, an outline of the required design was made. This included the selection of suitable communication between the onboard Operating System and a user; the easiest way to load user programs into the board memory; and methods to test and debug this program. All the normal support circuitry required by a micro-controller to accommodate a minimum system for operation was included into a single Field Programmable Gate Array. The execution of the project was therefore divided into three distinct sections, the hardware, the firmware (Programmable Array configuration) and the software. In the design, the harmony between these sections had to be consolidated to yield a successful final product. The simplicity and ergonomics of the operation and application from a user's point of view, had to be accentuated and kept in mind throughout. In a design of the complexity such as this, careful planning and the investigation of various methods of approach were essential. The use of many computer-aided design and other relevant computer packages was incorporated. Interaction between the user and the Operating System on the board was done through a standard 16-character by 1-line LCD Display Module and a 32-key keyboard. The main feature of the Operating System was to enable the inspection and editing of all the memory locations on the micro-processor.
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Dutt, Sushil. "An improved medium access control protocol for real-time applications in WLANs and its firmware development." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2012. https://ro.ecu.edu.au/theses/475.
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The IEEE 802.11 Wireless Local Area Network (WLAN), commonly known as Wi-Fi, has emerged as a popular internet access technology and researchers are continuously working on improvement of the quality of service (QoS) in WLAN by proposing new and efficient schemes. Voice and video over Internet Protocol (VVoIP) applications are becoming very popular in Wi-Fi enabled portable/handheld devices because of recent technological advancements and lower service costs. Different from normal voice and video streaming, these applications demand symmetric throughput for the upstream and downstream. Existing Wi-Fi standards are optimised for generic internet applications and fail to provide symmetric throughput due to traffic bottleneck at access points. Performance analysis and benchmarking is an integral part of WLAN research, and in the majority of the cases, this is done through computer simulation using popular network simulators such as Network Simulator ff 2 (NS-2) or OPNET. While computer simulation is an excellent approach for saving time and money, results generated from computer simulations do not always match practical observations. This is why, for proper assessment of the merits of a proposed system in WLAN, a trial on a practical hardware platform is highly recommended and is often a requirement. In this thesis work, with a view to address the abovementioned challenges for facilitating VoIP and VVoIP services over Wi-Fi, two key contributions are made: i) formulating a suitable medium access control (MAC) protocol to address symmetric traffic scenario and ii) firmware development of this newly devised MAC protocol for real WLAN hardware. The proposed solution shows signifocant improvements over existing standards by supporting higher number of stations with strict QoS criteria. The proposed hardware platform is available off-the-shelf in the market and is a cost effective way of generating and evaluating performance results on a hardware system.
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Tanasa, Valentin. "Development of theoretical and computational tools for the design of control strategies for nonlinear sampled-data systems." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00763971.
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This thesis is concerned with the sampled-data control of non-linear continuous-time systems. Sampled-data systems are present in all computer controlled, hybrid or embedded systems. The design and computation of suitable digital controllers represent unavoidable tasks since both continuous and discrete-time components interact. The basic framework of this work takes part of a wide research activity performed by S. Monaco and D. Normand-Cyrot regarding non-linear sampled-data systems. The underlying idea is to design digital controllers that recover certain continuous-time properties that are usually degraded through sampling as it is the case when continuous-time controllers are implemented by means of zero-order holder devices (emulated control). This thesis brings contributions into three different directions. The first one regards theoretical developments: a new digital backstepping-like strategy design for strict-feedback systems is proposed. This method is compared with other strategies proposed in the literature. The second contribution is the development of a control designer and of a simulation toolbox (in Matlab) for non-linear sampled-data systems. This toolbox includes different digital design strategies such as: multi-rate control, input-output/Lyapunov matching, digital backstepping design, etc. The third contribution concerns several case studies conducted to highlight the performances of the sampled-data controller designs, computed by the means of the software toolbox. Experimental and simulation results are described for various real examples especially in the area of electrical and mechanical processes.
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Moscovic, Sandra A. "Development of time and workload methodologies for Micro Saint models of visual display and control systems." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/40443.
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Peña, López Ismael. "Measuring digital development for policy-making: Models, stages, characteristics and causes." Doctoral thesis, Universitat Oberta de Catalunya, 2009. http://hdl.handle.net/10803/9126.
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With this work, our aim is to analyze how and why the different approaches to model and measure the Information Society have determined what is meant by the concept of access to Information and Communication Technologies and digital development. And, based on this first analysis, work on and propose a 360º digital framework that can serve policy-making while, at the same time, be able to state whether and why governments should seek to foster the development of the Information Society.Thus, the goal of this research is to identify the relevant factors that promote digital development, to define and describe - on that basis - its different stages and to explain the causes why a particular country might therefore be classified as a digital leader or a laggard and, lastly, answer whether and why governments should foster the Information Society.
To address this goal we have split our research into three main areas:
Analyzing the available tools for measuring the digital economy; and
Defining the stages of digital development, their characteristics and their causes; in particular, isolating the role of the public sector.
In the first area of research we cover the impact of ICTs, the concepts of access and the digital divide and the need to foster digital development. Our research questions in this area are:
What is "access"? What are its components?
What are the main approaches to defining access and why?
Is there any evidence that access to ICTs has had a positive or negative impact on the general socio-economic development of a country?
Why may there be a lack of access in a particular country or region, or to use a more familiar term, a "digital divide"?
Is it worthwhile for governments to attempt to foster digital development to accelerate the positive impacts of access to ICTs?
The second research theme explores, broadly and in depth, the ways in which access, digital development and the digital divide have been measured over the years, in particular through the use of composite indices. The related research questions are as follows:
What are the main models that depict digital development?
What are the approaches that these models follow to describe digital development?
What are the consequences of the different approaches followed in defining digital development models?
The third and final research theme focuses on the different stages, or phases, of digital development, their main characteristics and the reasons why digital development at the country level might be unevenly distributed.
Can we group countries according to their different levels of digital development and thus define a comprehensive model for measuring it?
What are the characteristics that enable us to cluster together countries according to their specific level of digital development?
What are the characteristics that distinguish between different levels of digital development?
Why some countries are more digitally developed than others?
The findings and reflections arising from these research questions should enable us to test the general hypothesis that guides our research. We believe that narrow institutional interests and a lack of appropriate data have led to a biased or fragmented measurement of digital development that is often focused on specific purposes. But if digital development is conceived as a continuum and described by means of a comprehensive model, then, at the country level, it can be observed that digital development happens in stages. These stages can be characterized by common features and distinguished by the scores achieved on certain key indicators. The improvement of its general economic indicators - such as income and wealth - characterizes the progression of a country along this continuum depends mainly on. Besides these basic economic aspects, if there is an appropriate Economic Incentive Regime, strong Government prioritization of ICT and a high importance afforded to ICTs in the Government's vision of the future, then digital development is much more likely to happen. In some cases, these policies may allow leapfrogging so that a country can progress faster in its digital development than would be predicted by its general level of economic development.
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Konrad, Martin [Verfasser], Norbert [Akademischer Betreuer] Pietralla, and Harald [Akademischer Betreuer] Klingbeil. "Development and commissioning of a digital rf control system for the S-DALINAC and migration of the accelerator control system to an EPICS-based system / Martin Konrad. Betreuer: Norbert Pietralla ; Harald Klingbeil." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2013. http://d-nb.info/1107769779/34.
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Lashgari, Diana. "Ett (socialt) hållbart digitaliserat Sverige? : En jämförande studie om svenska kommuners sociala hållbarhetsarbete i en digital kontext." Thesis, Södertörns högskola, Offentlig förvaltning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-46309.
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Social sustainability and digitalisation are two concepts that are gaining a large place in the public debate today, and are relevant in all sectors of society. For the public sector, the relevance can be traced to the global goals and the 2030 Agenda for sustainability, and Sweden's national ambitions to become the best in the world in taking advantage of digitalisation opportunities. The many possibilities of digitalisation are emphasized in many contexts in order to achieve the global goals, but digitalisation also entails challenges for many people who need to be considered and managed in order for development to take place in a socially sustainable way. The thesis aims to study social sustainability and digitalisation in an integrated way by examining how four Swedish municipalities with a social sustainability profile work with these issues, and how this is reflected in the digitalisation work. The study is based on interviews and document studies. Similarities and differences are explained from an organizational and governance perspective. The result shows that social sustainability is a difficult concept to define, and that it appears in many different forms, where there are difficulties in making all visible. However, the study has been able to show prominent aspects of social sustainability based on the literature, and how sustainability management can be conducted in a digital context. Further, it shows that the aspects of social sustainability that are emphasized in a digital context are largely related to the single efforts that are being made in each case and municipality. Similarities and differences in how the municipalities integrate social sustainability in the digitalisation work are explained on the basis of terms of organization, governance, sustainability management, branding and collaboration.Social hållbarhet och digitalisering är två begrepp som erhåller stor plats i samhällsdebatten idag, och är aktuella i alla samhällssektorer. För offentlig sektor kan relevansen härledas till det globala arbetet med Agenda2030, och Sveriges nationella ambitioner om att bli bäst i världen på att tillvarata digitaliserings möjligheter, där kommuner är viktiga aktörer i utvecklingen. Digitaliseringens möjligheter framhålls i många sammanhang i syfte att nå de globala målen, men digitaliseringen medför också utmaningar för många människor som behöver betraktas och hanteras, för att utvecklingen ska ske på ett social hållbart sätt. Uppsatsen syftar till att studera social hållbarhet och digitalisering på ett integrerat sätt genom att undersöka hur fyra svenska kommuner med en social hållbarhetsprofil arbetar med frågorna, samt hur det återspeglas i digitaliseringsarbetet. Undersökningen baseras på intervjuer och dokumentstudier. Likheter och skillnader förklaras från ett organisations- och styrningsperspektiv. Studien har visat på att social hållbarhet är ett svårdefinierat begrepp som uppträder i många former, och att det finns svårigheter med att synliggöra alla. Studien har dock kunnat visa på framträdande aspekter av social hållbarhet i kommunala verksamheter utifrån litteraturen, och hur hållbarhetsstyrning kan bedrivas i en digital kontext. Vidare visar studien att de aspekter av social hållbarhet som framhålls i en digital kontext, är till större delen relaterade till de insatser som bedrivs inom varje kommun. Likheter och skillnader i hur kommunerna integrerar social hållbarhet i digitaliseringsarbetet förklaras utifrån termer om organisering och styrning, hållbarhetsstyrning, varumärkesarbete och samverkan.
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Resende, Guilherme Pereira de. "Equipamento de biofeedback para tratamento fisioterápico em pacientes portadores de pé equino." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1206.
Full textAbstract:
Este trabalho descreve o desenvolvimento de um equipamento de biofeedback para utilização por fisioterapeutas no tratamento de pacientes portadores de pé equino. Normalmente o pé equino está relacionado a uma das sequelas de um acidente vascular cerebral e é caracterizado pela dificuldade no controle motor do membro afetado, muitas vezes apresentando limitações relacionadas à sensibilidade e dificuldade em manter o calcanhar em contato com o solo durante a marcha. O equipamento foi construído com base no conceito de biofeedback, apresentando ao paciente, em tempo real, informações relacionadas à intensidade de força aplicada nos membros inferiores. O equipamento é composto de sensores de força flexíveis alojados em um par de sandálias, ligados a um circuito eletrônico microcontrolado. Todo o processamento é realizado por um MSP430, e a comunicação é feita por sinais de rádio através de um módulo CC1101. Os dados são apresentados em uma interface de software em um computador portátil a uma taxa de atualização de 20 Hz. O software possui diversas funcionalidades para atender tanto as necessidades dos fisioterapeutas quanto dos pacientes. Do ponto de vista do paciente, a interface apresenta um visual simples e objetivo, facilitando o entendimento das variações de força, apresentadas na forma de barras verticais. Foram utilizados também recursos visuais e sonoros para enfatizar aos pacientes quando os objetivos estipulados para seu tratamento foram atingidos. Outras funcionalidades foram desenvolvidas para que os fisioterapeutas tenham a opção de customizar a interface de biofeedback de acordo com a necessidade de cada paciente, além de possibilitar o armazenamento de todos os dados dos sensores para análises posteriores. O protótipo foi testado em 20 voluntários durante 10 sessões de fisioterapia, sendo 10 portadores da disfunção pé equino e outros 10 normais para compor um grupo de controle. O objetivo principal do protocolo fisioterapêutico foi melhorar a manutenção do contato como o solo no calcanhar afetado. Os valores de pressão no calcanhar afetado de todas as das sessões foram adquiridos a uma taxa de 20 Hz, armazenados e analisados segundo as seguintes métricas: média, máximos e somas acumuladas. Também foi realizada a avaliação de Berg para todos os voluntários. Os resultados demonstraram que, para as métricas analisadas e também para a avaliação de Berg, houve uma evolução em todos os pacientes.This work describes the development of a biofeedback device to be used by physiotherapists during treatment of patients with equinus foot. Normally the equinus foot is related to one of the sequelae of a stroke and is characterized by difficulty in motor control of the affected limb, often resulting in limitations on sensitivity. The equipment was built on the concept of biofeedback, presenting to the patient, in real time, information related to the intensity of the forces applied to the lower limbs. The equipment consists of flexible force sensors accommodated in a pair of sandals, connected to a microcontrolled electronic circuit. The whole processing is performed by an MSP430, and the communication is done by radio signals through a CC1101 module. The data is presented in a software interface on a laptop computer at a refresh rate of 20 Hz. The software has many features to meet both the needs of physiotherapists as patients. From the point of view of patients, the interface was designed to be simple and objective, facilitating the understanding of force variations that change dynamically at the exact moment when the sensors are pressed. Visual signs and sound were also used to emphasize to patients when the goals established for their treatment has been reached. Other features were developed specifically for physicaltherapists, giving them the option to customize the biofeedback interface according to the needs of each patient, and also allowing the storage of all data transferred by the sensors for further analysis. A prototype was developed and tested on 20 volunteers over 10 sessions of physical therapy, 10 patients with equinus foot dysfunction, and 10 normal people to compose a control group. At the end of the treatment period, the data were analyzed by session, according to the average forces, the maximum values reached, the accumulated sums and Berg assessments. The results revealed an evolution in all patients, some of them in a greater degree and others in lower degree of progress.
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Johansson, Jonas, and Daniel Petersson. "Torque Sensor Free Power Assisted Wheelchair." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-656.
Full textAbstract:
A power assisted wheelchair combines human power, which is delivered by the arms through the pushrims, with electrical motors, which are powered by a battery. Today’s electric power assisted wheelchairs use force sensors to measure the torque exerted on the pushrims by the user. The force sensors in the pushrims are rather expensive and this approach also makes the wheels a little bit clumsy. The objective with this project is to find a new, better and cheaper solution that does not use expensive force sensors in the pushrims. The new power assisted wheelchair will instead only rely on its velocity, which is measured with rotational encoders, as feedback signal and thereby the project name “Torque Sensor Free Power Assisted Wheelchair”.
The project consisted of two main parts; an extensive construction part, where an ordinary joystick controlled motorized wheelchair has been rebuild to the new power assisted wheelchair without torque sensors and a development part, where different torque sensor free controllers has been designed, simulated, programmed and tested.
The project resulted in a torque sensor free power assisted wheelchair, where the final implemented design is a proportional derivative controller, which gives a very good assisting system that is robust and insensitive to measurement noise. The proportional derivative control design gives two adjustable parameters, which can be tuned to fit a certain user; one parameter is used to adjust the amplification of the user’s force and the other one is used to change the lasting time of the propulsion influence.
Since the new assisting control system only relies on the velocity, the torque sensor free power assisted wheelchair will besides giving the user assisting power also give an assistant, which pushes the wheelchair, additional power. This is a big advantage compared to the pushrim activated one, where this benefit for the assistant is not possible.
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Jebelli, Ali. "Development of Sensors and Microcontrollers for Underwater Robots." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31283.
Full textAbstract:
Nowadays, small autonomous underwater robots are strongly preferred for remote exploration of unknown and unstructured environments. Such robots allow the exploration and monitoring of underwater environments where a long term underwater presence is required to cover a large area. Furthermore, reducing the robot size, embedding electrical board inside and reducing cost are some of the challenges designers of autonomous underwater robots are facing. As a key device for reliable operation-decision process of autonomous underwater robots, a relatively fast and cost effective controller based on Fuzzy logic and proportional-integral-derivative method is proposed in this thesis. It efficiently models nonlinear system behaviors largely present in robot operation and for which mathematical models are difficult to obtain. To evaluate its response, the fault finding test approach was applied and the response of each task of the robot depicted under different operating conditions. The robot performance while combining all control programs and including sensors was also investigated while the number of program codes and inputs were increased.
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Fekrmandi, Hadi. "Development of New Structural Health Monitoring Techniques." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/cgi/viewcontent.cgi?article=2923&context=etd.
Full textAbstract:
During the past two decades, many researchers have developed methods for the detection of structural defects at the early stages to operate the aerospace vehicles safely and to reduce the operating costs. The Surface Response to Excitation (SuRE) method is one of these approaches developed at FIU to reduce the cost and size of the equipment. The SuRE method excites the surface at a series of frequencies and monitors the propagation characteristics of the generated waves. The amplitude of the waves reaching to any point on the surface varies with frequency; however, it remains consistent as long as the integrity and strain distribution on the part is consistent. These spectral characteristics change when cracks develop or the strain distribution changes. The SHM methods may be used for many applications, from the detection of loose screws to the monitoring of manufacturing operations.
A scanning laser vibrometer was used in this study to investigate the characteristics of the spectral changes at different points on the parts. The study started with detecting a load on a plate and estimating its location. The modifications on the part with manufacturing operations were detected and the Part-Based Manufacturing Process Performance Monitoring (PbPPM) method was developed. Hardware was prepared to demonstrate the feasibility of the proposed methods in real time.
Using low-cost piezoelectric elements and the non-contact scanning laser vibrometer successfully, the data was collected for the SuRE and PbPPM methods. Locational force, loose bolts and material loss could be easily detected by comparing the spectral characteristics of the arriving waves. On-line methods used fast computational methods for estimating the spectrum and detecting the changing operational conditions from sum of the squares of the variations. Neural networks classified the spectrums when the desktop – DSP combination was used. The results demonstrated the feasibility of the SuRE and PbPPM methods.
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Cheng, Yu-Yao, and 鄭郁耀. "On modularized digital control circuit development tools." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/74997476453273458008.
Full textAbstract:
碩士國立中央大學
機械工程學系
84
The purposes of the paper are in three folds. First of all, we analysis the common digital circuit system, and modularize them as combination of their basic functions such as CPU, address decoder, memory, analog to digital converter, digital to analog converter. Secondly, we introduce the development tools for digital control circuit as our research result. Finally, with an example, we illustrate the procedural of using our development tools for digital system design. We expect the results can help the fellow students in developing the hardware for digital control system.
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王順泰. "Development of Digital Control for Switched Reluctance Motor drives." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/26289373107560204280.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
90
This thesis is concerned with design and implementation of digital control for switched reluctance motor(SRM) drives. Although the motor has high starting torque and high speed operation characteristics, the double salient-rotor structure and nonlinear inductance feature make its developed torque highly nonlinear. Hence, the improvement of control strategy is indispensable to provide the SRM with smoother output torque and better speed response. Then, a novel current control technique is proposed to achieve current response with zero steady-state error for this purpose. The proposed control strategy is used to drive the operation of the whole system. Meanwhile, a low-cost digital signal processor is used to complete the implementation of the proposed system for reduction of cost and control circuit. Finally, experiments are given to verify the analysis.
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CHEN, MING-HUNG, and 陳明宏. "Development of Digital Control for AC Permanent-Magnet Synchronous Motor drives." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/12385857521749624194.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
89
This thesis is concerned with the development of digital control system for ac permanent-magnet synchronous motors to yield good speed regulation, low current harmonic and stable output speed. The design of controller is conducted by digitizing the mathematical model of ac permanent-magnet synchronous motors using impulse invariance technique. The regulation and limitation of control parameters are also studied. In addition, a predicted current estimator, which is insensitive to motor feedback currents, is proposed to function under stationary frame for harmonic current suppression. A digital control system for 150 kW ac permanent-magnet synchronous motor is realized with digital signal processor (DSP TMS320F240). Experimental results indicate that the total harmonic distortion of current is reduced from 10% to 7.2% for 850 W and 3.3% to 3% for 48 kW output power by the proposed predicted current estimator technique.
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Li, Jian-You, and 李建佑. "Development of Dimmer Control Circuit Based on DLT Digital Modulation Technology." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/11869969678552368464.
Full textAbstract:
碩士國立彰化師範大學
電機工程學系
104
This paper develop a dimmer control circuit based on DLT(Digital Load Side Transmission) digital modulation technology. The development mainly adopt a full-bridge rectifier as the main circuit, and a zero potential detection circuit and a modulation signal voltage change protection circuit as the ancillary circuits. The microcontroller is used to determine the AC phase position through the collocation with the detection signal of the zero potential detection circuit to meet the standards of DLT digital modulation technology. When the microcontroller marks the data transmission, the modulation signal voltage change protection circuit protects voltage change to avoid the voltage change of the marker signal being higher than the standards of DLT digital modulation technology. In order to verify the feasibility of this light modulator control circuit, this paper practically controls the brightness of the adjustable LED lights made by DLT technology, and discusses the implications of the light modulator control circuit. In addition, the experimental results demonstrate the feasibility of the light modulator control circuit.
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Yang, Guo-Wei, and 楊國瑋. "Development of Lighting Control System Based on Digital Load Side Transmission." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/6gcvv8.
Full textAbstract:
碩士國立彰化師範大學
電機工程學系
105
In this thesis, successfully develops a "Circuit Based on Digital Load Side Transmission for Power Line Communication". In dimming control use the DLT technology can switch a variety of control, such as group switching, color change and adjustable brightness. Use existing power lines as a transmission interface. The data loads high-frequency signal to the power line. Control LED lighting brightness through the power line. This dimming strategy can replace the traditional dimming control circuit used in the transmission module to reduce costs. The circuit structure of this paper mainly uses two sets of bridge rectifier circuit with the modulation signal circuit to control. In the former class bridge circuit mainly collocates resistance as a drain circuit. Release the excess voltage of LED after it is turned on by switching the signal so that the post-modulation voltage signal can normally operate. The latter class bridge circuit uses modulation signal circuit as the basis of generating data. Consider the Zener diode reverse breakdown voltage, when the load voltage reaches the breakdown voltage value, then the Zener diode break down. Continuously output a stable DC to switch on signal, so that output a data period as the basis of dimming signal and verify the feasibility of dimmer control circuit. In this paper, the actual test with DLT technology adjustable LED light brightness, and in the experimental results can be learned in this paper proposed dimmer control circuit feasibility. This paper tests adjustable brightness of LED lights which has DLT technology. The feasibility of the dimmer control circuit proposed in this paper can be obtained from the experimental results.
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Huang, Po-Chien, and 黃柏堅. "The Development of a Digital Position Control System for Laser Scan Heads." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/45691136607274161357.
Full textAbstract:
碩士國立成功大學
航空太空工程學系碩博士班
94
With the development of the laser technique, the industrial applications have increased more than before. Laser power, laser wavelength, cavity and scan head are the key points of the laser processing systems. The scan head is the equipment which affects the accuracy of the laser focus, because it can control the direction of the laser and adjust the laser focus. In this research, we discuss how to control the galvanometer of the scan head precisely as soon as possible. Galvanometer is one of the voice-coil motors. It has the low moment of inertia and high bandwidth. It’s a mechanical system with the settling time on the level of minimum second. To match up the characteristic of high bandwidth, the traditional technique uses the analog control. However, the noise affects the analog control very much and altering the control law is equivalent to redesigning the control circuit. Therefore, we try to use the digital control in this research. In this research, the gray box is used to establish the numerical model of the galvanometer and then use the frequency response to prove the model. After that, the two phase PID control is designed and the PC-Based system is used to operate. The experiment shows that the settling time of the 20° position control is 4.15ms. It already reaches the extremity of the performance of the PC-Based system. In order to reduce the settling time and increase the accuracy, we use the DSP system to be the core digital system. According to the experiment, we find that the settling time can reduce 11.84%.At least, according to the result of experiments, the three phase controller is used to improve the performance.
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Li, Tzu-Hui, and 李姿慧. "Research and Development of Digital Control for a High Efficient Lighting System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/01843741155706981106.
Full textAbstract:
碩士國立高雄第一科技大學
電機工程研究所碩士在職專班
102
In this thesis, a high power factor LED driver circuit using fly-back and buck converters for digital lighting systems is proposed. The theory and components of the converter circuits are verified. The correct circuit of power factor makes use of fly-back power circuit. To reduce energy consumption, the converters operate on discontinuous current mode at constant switching frequency. To reduce the flash of LED lighting, the output circuit makes of buck converter to decrease the low frequency ripples produced by fly-back converter. Finally, a LED driver circuit on the voltage between 90v and 132v for output current 440mA is implemented.
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Lee, Cheng-Yen, and 李承諺. "Development of Intelligent Voice Coil Motor Position Control System using Digital Signal Processor." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/25834616457352914072.
Full textAbstract:
碩士國立臺灣師範大學
電機工程學系
104
This paper aimed to design robust and precise control systems for the position control of a non-linear and time-varying voice coil motor (VCM). First, a proportional-integral-derivative based fuzzy neural network with elitist bacterial foraging optimization (PIDFNN-EBFO) control strategy was proposed in which the initial parameters of the network were optimized to avoid falling into local optimal solutions. Subsequently, a compensatory fuzzy neural network with dynamic particle swarm optimization (CFNN-DPSO) control approach was further developed to simplify the computational burden of the PIDFNN-EBFO control system. In CFNN-DPSO, the CFNN and DPSO were used to derive the control effort and estimate the Jacobian term, respectively. Besides, an Elman neural network (ENN) was used to serve as a virtual VCM system for the online estimation of the mover position. In order to improve the robustness of the VCM control system, an intelligent fractional order sliding mode control (IFOSMC) system was proposed in this study. In the IFOSMC, a CFNN observer was designed to observe a lumped uncertainty and replace the hitting control directly. Besides, a switching compensator was employed to compensate the observation error considering the system stability and control smoothness. All the real-time control systems were implemented via the digital signal processor (DSP). Moreover, two reference trajectories and two test conditions were provided to evaluate the control performances in this study. From the experimental results, the VCM can be controlled to track the reference trajectories efficiently and accurately via the proposed control systems.
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Huang, Chiung_Yao, and 黃瓊瑤. "Design of fuzzy controller development environment and it's application on digital position control." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/93882224328853247298.
Full textAbstract:
碩士國立成功大學
電機工程研究所
82
Fuzzy logic have been successfully implemented to con- trol nonlinear,time-varying ,ill-defined system,to control systems whose dynamics are exactly known.In order to make profit on time and economics in the process of development of fuzzy logic, what we need is a more ideal development system.But,the fuzzy logic development kits which has been finished for sale are ordinarily too expensive,too compli- cated,not easy for an user to operate it, can't be put to the proof right away ,and so are not practical.To improve these drawbacks as stated above,we try to established by ourself a development environmemt.The one which we estab- lished has friendly user interface,and is easy to operate .It can even be used repeadtly for different need and be put to proof with few change when experimental hard ware is ready. Digital position control is still the base of automati- cally controlled machines.So, we take it to test the effec- tivity of development environment.The experimental system for demonstration is composed essentially of control soft- ware written in Microsft Windows operating environment ,control circuits,power circuits ,and interfaces.The con- trol software is a fuzzy controller whose functions assumed are user dialogue,data processing and transmission,display, diagnostic, measurement,etc.The control ciruits consist of three main parts. One is phase lock loop circuit, one is pulse wide modulation circuit,the other one contains incremental encoder,up/down counters,and an interface circuit which pro- cesses output signal of encoder in order to provide infor- mation on position and speed.The power circuits consist of dc motor fed by a four- quadrant transistor bridge which is nece- ssary for acceleration and braking in both directions.Besides above ,in order to find the suitable and stable parameters of fuzzy logic ,we adopt Taguchi-Method to experiment auxilarily. From the result of demonstration ,we can see the effectivity of our development environment.
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ZENG, YU-XIAN, and 曾昱憲. "Development of a Digital Controlled Hybrid-Type DC Converter with Efficiency Improvement Control." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/rawe36.
Full textAbstract:
碩士國立臺北科技大學
電機工程系
107
In this thesis, a digital controlled hybrid-type DC converter with efficiency improvement control is developed. In the implementation of the circuit, a PSFB resonant converter is used as the main converter, and a half-bridge LLC(HB-LLC) resonant converter is used as the auxiliary converter. In this thesis, the microcontroller detects the converter output current as the feedback signal and in which a look-up table of the efficiency curve for different circuit modes is established to ensure the converter operates in the corresponding circuit mode according to the optimal efficiency curve. The converter developed in this thesis consists of HB-LLC circuit mode, PSFB circuit mode and integrated circuit mode. At light load condition, the microcontroller can switch the converter to HB-LLC circuit mode to improve the inefficient of PSFB. In case of medium load, the converter will operate in PSFB circuit mode, while in case of heavy load, the converter will operate in integrated circuit mode. Through the parallel output of the main converter and the auxiliary converter to further increase the maximum output power of the converter. Finally, this thesis develops a DC-to-DC converter with an input voltage of 400V, an output voltage of 48V and a total output of 750W. The actual measurement results verify the theoretical analysis and feasibility of the power converter designed in this thesis.
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Lu, Fung-Teng, and 呂芳騰. "Desing And Implementation Of A Window-Based Interactive Digital Control Development System Using DSP." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/05733871547445458231.
Full textAbstract:
碩士國立交通大學
控制工程研究所
83
This thesis presents the design and implementation of an interactive digital control development system. The designed system named DSPLab can assist engineers to develop their digital control systems under an integrated, interactive and graphic user interface. DSPLab provides facilities of on-line variable monitoring and parameter tuning. As soon as users use Tuning Box to tune parameters of control blocks, they get responses in Scope. We also propose a new programming language called Control-C. It is a high level language of which syntax is similar to the C language, but it is more convenient for describing digital control systems. Users can use Control-C to implement their digital control systems. Object-oriented paradigm is applied to design the software part of DSPLab in order to develop high-quality software. The designed software may become a software IC. In addition, a dual-DSP PC compatible expansion card is designed to implement digital controllers. Two DSPs cooperate properly to achieve the total capability of 26.8 MIPS at most. It can be used to implement digital controllers that have very complex algorithms. The work of designing a digital controller is integrated into a low-cost Windows-based personal computer. It is helpful for an engineer to design a digital control system. In this thesis, an example of dc servo motor control system is made to exhibit the capability of DSPLab.
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Yang, Yi-Lan, and 楊逸嵐. "Development and digital control of inverter systems with galvanic isolation and front-end SMR." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/52575344403156928782.
Full textAbstract:
碩士國立清華大學
電機工程學系
96
本論文旨在研製具切換式整流器前級及電氣隔離之變頻器系統並從事其數位控制。首先，建立具低頻輸出隔離變壓器與高頻變壓器隔離直流鏈之單相變頻器，並比較評估其操控性能。後者以具高頻隔離變壓器之全橋式直流/直流轉換器提供變頻器之直流鏈電壓。為達到零電壓軟式切換，本文採用負載串聯諧振軟式切換。於控制方面，藉由強健波形控制法則，達到在線性與非線性負載下皆能具有良好穩態及動態之瞬間波形追控，對於隔離型全橋式直流/直流轉換器，亦提供適當之控制器設計，以使其具有良好調節特性。 切換式整流器亦稱功因校正整流器，因可提供具良好調控之直流鏈電壓及交流輸入電力品質，已日漸廣泛地被用為電力設備之前端轉換器。三相單開關切換式整流器在不連續導通模式下，因具有良好之電力品質而不需電流迴授控制。因此，本文採用此型切換式整流器，藉由妥善之電路及控制器設計，以獲得良好之直流輸出電壓及交流入電電力品質控制特性。 眾所皆知地，三相變頻器可用具有六開關之單一功率模組建構，或由多個單相變頻器組接形成。本論文另一目的在於建構並比較評估此兩種組態三相變頻器之效能，更具體而言，本文將建立單一模組化三相變頻器，以及由單相變頻器組接成 接之三相變頻器。後者在有一模組故障時，可自動地變成V接三相變頻器，在降低額定下持續提供三相電源。 近年來，電力電子設備之小型化已極其吸引人關注，此可藉由多級電力電路之整合與共同數位控制環境促成。在所建構之系統中，將由同一數位信號處理器從事變頻器系統中多功率級之數位化控制，只需外加少數類比電路元件，解決所採數位信號處理器之能力限制，由適當之控制機構設計及一些控制實務考量，可得良好變頻器系統操控性能。所建構變頻器系統之性能將以一些實測結果驗證。
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Liao, Wei-Ting, and 廖偉廷. "Design and Development of Electronic Interface and Control System to the Digital Micromirror Device." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/y69srp.
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Fang, Cheng-Shun, and 方政順. "Synchronous Control of Chaotic Systems and Its Development in Wireless Digital Image/Audio Secure Communication." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/9r9999.
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碩士國立高雄海洋科技大學
輪機工程研究所
103
In this thesis, the synchronous controls for three classes of chaotic systems (Horizontal Platform, Coronary Artery, Rikitake) are considered and investigated. The sliding mode control (SMC) and proportional- integral-derivative (PID) control are two main proposed approaches to achieve synchronization of considered systems. For PID synchronous control, the particle swarm optimization (PSO) is used to find the optimal PID controller parameters by integral square error method (ISE) for the convergence conditions. On the other hand, the sliding mode control is design based on the Lyapunov stability theory. Finally, the effectiveness and accuracy of the proposed methods are applied to digital image/audio and wireless communications security. This proposed digital approach is easy to debug and maintain, and exclude traditional analog multiplier circuit design method.
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Liu, Meng Hao, and 劉孟皓. "Preliminary Design and Development of Electronic Interface and Control System to the Digital Micromirror Device." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/fgv252.
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Huang, Yin-Xi, and 黃胤璽. "Development of Binocular Vision Control of Ball Batting Robot by Digital Signal Processor on Embedded System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/22834272337503104743.
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碩士國立臺灣科技大學
材料科學與工程系
101
There are a lot of image servo systems in PC-based development, affecting enormous system cost, low efficiency, not appropriate independent operation and huge size hardware. In recent years, advance development in technology increase processing speed of Digital Signal Processor (DSP) and expands its functionality. In embedded system, DSP has high accuracy and high performance processing in complex arithmetic. Therefore, it could become the most system’s requirement for real-time capability and replace PC-based in visual servo system. In this study, TMS320DM648 and DMS320F2812 are utilized in the system. Principally, DM648 as a vision system can calculate position information of moving object and predict its value. F2812 as robot control core works based on the following sequence processes: Initially, the control commands are sent by UART to the robot control kernel. Secondly, rotation angle is got by using the inverse kinematics, and finally, the target is responded by the robot arm, i.e. hitting the target.
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Lin, Yi-Lan, and 林義嵐. "Development of Visual Servo Control of Ball Batting Robot by Digital Signal Processor on Embedded Platform." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/84867712333604509918.
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碩士國立臺灣科技大學
自動化及控制研究所
98
Most of the visual servo systems in are currently designed for the industrial automation application. Few of them are created for recreational or leisure purposes, and besides, the core of their development is based on personal computer, resulting in the enormous system cost and huge volume. However, several functional upgrades of digital signal processor (DSP), including computing enhancement and increase of storage capacity, have enabled DSP to replace the personal computer-based Visual Servo Systems. The research utilized the DSP provided by Texas Instrument as the platform for system development, integrating visual capture cameras and Three-link robotic arms. The research goal is to develop human-computer interaction of recreational robots and build a visual servo ball-hitting system. The research is divided into image processing and motion control sub-systems. Visual processing sub-system will calculate the rolling track of the balls, predict its location in hitting area, and then notify the motion control system the result, to formulate the robot arm in anthropomorphic ways to strike the ball. From actual field tests of this research, the system proves that it can accurately predict the hitting area of the ball and then perform exact swing movements. Key Word: Visual Servo System, Digital Signal Processor, Three-link robot arm, embedded system.
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王偉翔. "Development of a Digital PFC Control Scheme with High Efficiency and Power Factor over Wide Load Variation Range." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/8s3j69.
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碩士國立交通大學
電控工程研究所
101
To maintain high efficiency and power factor over wide load variation range is very difficult by a boost PFC converter using conventional analog control. This thesis proposes a multi-mode control method using repetitive and adaptive control techniques to improve light load efficiency and power factor. A new current sensing scheme is developed to detect the average current under fixed, variable switching frequency operation or in discontinuous mode without current sampling correction or oversampling method. An adaptive switching frequency control technique is developed to reduce switching losses and improve efficiency at light load. A design procedure is given for synthesizing the current loop controller and repetitive controller to minimize periodic errors caused by system, nonlinear characteristic or load variation, and maintains low total harmonic distortion. This thesis also illustrates the implementation issues of digital PFC controllers aimed at resolution, control algorithms, repetitive controller and so on. A 675 W single-phase boost PFC converter with programmable DSP controller has been constructed for the verification and comparison of the proposed control scheme under 10~100 % loads. Experimental results show that the proposed control scheme has better performances over wide load range especially below 50 % load.
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Konrad, Martin. "Development and commissioning of a digital rf control system for the S-DALINAC and migration of the accelerator control system to an EPICS-based system." Phd thesis, 2013. http://tuprints.ulb.tu-darmstadt.de/3398/7/Dissertation_Martin_Konrad_online.pdf.
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The high resolution scattering experiments conducted at the superconducting Darmstadt electron linear accelerator S-DALINAC call for a small energy spread of (ΔE/E) ≈ 1×10⁻⁴ of the beam. This requires stabilization of amplitude and phase of the electric field inside the accelerating cavities to (ΔA/A)ᵣₘₛ = 8×10⁻⁵ and (Δφ)ᵣₘₛ = 0.7°. The design and the commissioning of a new digital rf control system is the subject of this thesis.
At the S-DALINAC two types of cavities are in use. The normal-conducting chopper and buncher cavities only need corrections for slow temperature drifts and can be controlled by a generator-driven resonator control algorithm. The superconducting accelerating cavities have a very high quality factor and thus are very susceptible to vibrations. Therefore they are operated in a self-excited loop.
The rf control system is based on in-house developed hardware that converts the rf signal down to the baseband, digitizes it and feeds it into an FPGA. Inside this FPGA, a soft digital signal processor executes the control algorithm. The resulting correction is modulated onto the rf signal again and sent back to the cavity.
All accelerator components are remote-controlled from a central room via an accelerator control system. Since complex and re-programmable devices are not supported well by the existing in-house developed control system, the design and implementation of a new accelerator control system is also subject of this thesis. Further important aspects are expandability, usability and maintainability of the system. Therefore the new accelerator control system uses the EPICS framework as a basis since it already provides much of the basic functionality like graphical user interfaces and flexible control servers that can be customized rapidly. This allowed the implementation of more advanced functionality like extensive read-out and diagnostics for the rf control system.
The read out data can be visualized with a software oscilloscope and a spectrum analyzer software. Additionally the system provides on-line rms errors that can be used to optimize the control parameters very precisely and to monitor the performance of the controllers.
Measurements show that the performance of the rf control system has been improved by one order of magnitude compared to the analog system, yielding a phase stability of (Δφ)ᵣₘₛ = 0.8° and an amplitude stability of (ΔA/A)ᵣₘₛ = 7×10⁻⁵ and thus meeting the specification.
The described rf control system has been commissioned and successfully used for beam operation for two years. During this time the system has proven to be significantly more stable and reliable than the old analog system.
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Pirkle, Adam R. "Development of a micro gas analyzer controller and an organic light emitting diode lifetime testing system /." 2008. http://proquest.umi.com/pqdweb?did=1650508741&sid=1&Fmt=2&clientId=10361&RQT=309&VName=PQD.
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Marques, Pedro Manuel Videira. "Rapid Development of a High-Level Robot Controller for Automated Touch-Screen Testing." Master's thesis, 2021. http://hdl.handle.net/10316/98030.
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Dissertação de Mestrado Integrado em Engenharia Mecânica apresentada à Faculdade de Ciências e TecnologiaMuitos especialistas consideram que a Terceira Revolução Indústria está na origem desta nova revolução que estamos a experienciar. Conhecida por muitos como "Indústria 4.0", esta quarta revolução industrial é o culminar de uma necessidade, não só por parte de indústria como também das necessidades da sociedade atual. Numa época em estamos todos à distância de um simples "clique", porque não fazer o mesmo com os processos industriais. Sermos capazes de conectar as diferentes operações num único local, conseguindo supervisionar várias tarefas em simultâneo e até mesmo antecipando possíveis falhas na produção.Graças aos novos avanços tecnológicos, conseguimos ter softwares CAD em qualquer computador e com um enorme grau de resolução. Desta forma, através do Digital Twin, somos capazes de transformar os processos reais em processos virtuais. Esta ferramenta torna-se extremamente útil na área da robótica, onde conseguimos testar uma rotina num robo virtual, sem corrermos o risco de danificar o nosso hardware.A tese propõe abordar o problema de automatização de um braço robótico utilizado para testagem de ecrãs táteis, utilizando a metodologia de model-based design, para o desenvolvimento de um controlador de alto nível.Um estudo recente sugere um crescimento substancial do uso da tecnologia tátil na próxima década. Esta previsão pode colocar em risco a produção de ecrãs táteis necessários em diversos sectores. Nesta investigação, é apresentada uma nova alternativa que permitirá suportar este aumento na demanda de produtos, tendo em consideração outros fatores como por exemplo a sustentabilidade e eficiência .O controlador foi desenvolvido através de duas etapas. A primeira, consistiu no desenvolvimento e uso de um gémeo digital utilizado para simular o comportamento do robô apenas em ambiente gráfico. Resultados obtidos em simulação, permitiram observar e corrigir as falhas de programação existentes no comportamento do controlador. Na segunda fase, foi utlizado o dispositivo fornecido pela Speedgoat. Numa primeira fase de validação, o controlador foi apenas testado em ambiente de simulação de tempo real e só numa instância final diretamente com o robô.Para o desenvolvimento do nosso controlador autónomo e consciente foram também desenvolvidas técnicas de visão computacional.
Many experts believe that the Third Industrial Revolution is at the origin of this new revolution that we are experiencing. Known by many as "Industry 4.0", this fourth industrial revolution is the culmination of a need, not only on the part of industry but also the needs of today's society. At a time when we are all just a click away, why not do the same with industrial processes. Being able to connect the different operations in a single location, being able to supervise several tasks simultaneously and even anticipating possible production failures. Thanks to new technological advances, we are able to have CAD software on any computer and with an enormous degree of resolution. In this way, through Digital Twin, we are able to transform real processes into virtual ones. This tool becomes extremely useful in the area of robotics, where we are able to test a routine in a virtual robot, without running the risk of damaging our hardware. This dissertation addresses the automation problem for a robot arm utilized for touch screen testing by following a model-based design methodology for the development of a high-level controller.A recent study suggests a substantial growth of the usage of touch screen technology in the next decade. This forecast can put at risk the production of touch screen utilized in a diversify of sectors. In this research, it is presented a new alternative that will allow to support this increase in product demand, while considering other factors such as sustainability and efficiency.The controller was developed in two stages. The first one, consisted in the development and usage of a digital twin utilized only in a graphical environment in order to simulate the robot behavior. Gathered simulated results, allowed to observe and correct the controller’s behavior, prevenient from programming flaws. In the second one, it was utilized a hardware device provided by Speedgoat. In a first stage, the controller was only validated in a real-time simulation environment and in a final instance directly with the robot.For the development of our autonomous and conscient controller were also developed computer vision techniques.
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Sumbwanyambe, Mbuyu. "A pricing model for sustainable ICT development in a heterogeneous environment." Thesis, 2014. http://hdl.handle.net/10210/8777.
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D.Ing. (Engineering Management)Promotion of ICT usage in developing countries, even under rigorous government initia- tives and policies, is a discouraging undertaking and a very di cult one. One of the many challenges government of developing countries is facing in the promotion of ICT adoption is how to incorporate a subsidy rate discount into a price model as expressed in the following sentiments: Until now, USAASA has used very little of the money in the USAF. It must justify its spending plans each year before it is given access to any of Information on how price a ects the number of users was generated by asking users on how much the spent on internet usage. The sensitivity of users was determined by asking users how many hours they spent on the internet. Analysis of the information gathered showed that there was a substantial amount of money in USAASA and ZICTA co ers which was not utilized. Furthermore users expressed desire to have their prices subsidized. In rural areas internet prices were more expensive, on comparative terms, than those in the urban areas. Analysis of data or results concerning the price and the number of users showed that there was a positive relationship between the number of users and the price of the internet service. The relationship showed that a low price attracted a lot of users, while a high price attracted few users or none at all. The mathematical analysis of the pricing model proved that at a certain subsidy discount rate and price sensitivity, the model was able to reach equilibrium while maximizing the ISP's revenue. In conclusion the price of internet services for the information \have nots" depend on the price sensitivity and the level of subsidy given by the government. the funds". \Universal access of ICT services with particular reference to rural areas is an issue that has been on the agenda of most countries in the whole world today. You are aware that while some countries are currently e ectively extending services to rural areas using various means, others have found this challenging and have ended up with unutilized funds in the banks". Subsidies, though seen as the means of promoting social and economic agendas in developing countries, can create the tragedies associated with public resources usage or something-for-nothing resources. Given a subsidy discount rate or a low price, consumers usually anticipate a net bene t derived from free resources due to subsidy. Anticipation of net a bene t from such resources may generate a damaging rush from consumers to exploit the resource, which may result in the tragedy of the commons. On the contrary, when no subsidy is given, consumers face no di erential between the perceived utility and the price of the resource creating a no social and pecuniary bene t to users, as such very few consumers or users will utilize the resource. The contribution this research develops is as follows: To show the extent of ICT usage patterns in developing countries.To determine why ICT usage in developing countries is low even under rigorous government initiatives and policies. To determine how price a ects the number of users using the internet resource. To incorporate a subsidy discount rate in a price model for unserved or rural areas of developing countries. To proposes a subsidy driven pricing framework that helps both the internet service providers and users to maximize their utilities and prevent the tragedies associated with resource use i.e. the tragedy of the commons and the tragedy of the anti- commons. To apply a non-cooperative game theoretic model to investigate the con ict between ISPs and consumers or consumers in a heterogeneous communities i.e. the infor- mation \haves" and \have-nots". We de ne utility-based decision rules for both providers and users under varying prices and subsidy requirements. We provide a decision model under a non-cooperative, incomplete-information game environment. To investigates the properties of the NE (under di erent optimization rules) and to study whether there exists an optimal solution to the game. The basic hypothesis that this research addresses is: A pricing model, with correct subsidy discount rate allows for better resource usage (preventing the tragedy of the commons and anti-commons) and makes the attainment of the objective of \ICT access for all" more likely. The methodology used for collecting statistical data was a combination of qualitative and quantitative research methods. The purpose of research was to collect data that would later be used to propose a pricing framework for heterogeneous communities. The strategy was to use three important variables in the subsidy driven pricing model to validate the hypothesis i.e. subsidy discount rate, the relationship between price and the number of users and the sensitivity (elasticity of demand) of users towards price. Incorporation of subsidy discount rate into the pricing model was driven by the fact that institutional frameworks such as universal service and access agency of South Africa (USAASA) and the Zambia information and communications tech- nology authority (ZICTA) were sitting with unutilized universal service and access fund (USAF). Additionally, users of internet services in underserviced areas of the two countries advocated for subsidized prices towards internet provision.
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Rangwala, Mohammed M. "Secure Digital Provenance: Challenges and a New Design." Thesis, 2014. http://hdl.handle.net/1805/6051.
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Indiana University-Purdue University Indianapolis (IUPUI)Derived from the field of art curation, digital provenance is an unforgeable record of a digital object's chain of successive custody and sequence of operations performed on the object. It plays an important role in accessing the trustworthiness of the object, verifying its reliability and conducting audit trails of its lineage. Digital provenance forms an immutable directed acyclic graph (DAG) structure. Since history of an object cannot be changed, once a provenance chain has been created it must be protected in order to guarantee its reliability. Provenance can face attacks against the integrity of records and the confidentiality of user information, making security an important trait required for digital provenance. The digital object and its associated provenance can have different security requirements, and this makes the security of provenance different from that of traditional data. Research on digital provenance has primarily focused on provenance generation, storage and management frameworks in different fields. Security of digital provenance has also gained attention in recent years, particularly as more and more data is migrated in cloud environments which are distributed and are not under the complete control of data owners. However, there still lacks a viable secure digital provenance scheme which can provide comprehensive security for digital provenance, particularly for generic and dynamic ones. In this work, we address two important aspects of secure digital provenance that have not been investigated thoroughly in existing works: 1) capturing the DAG structure of provenance and 2) supporting dynamic information sharing. We propose a scheme that uses signature-based mutual agreements between successive users to clearly delineate the transition of responsibility of the digital object as it is passed along the chain of users. In addition to preserving the properties of confidentiality, immutability and availability for a digital provenance chain, it supports the representation of DAG structures of provenance. Our scheme supports dynamic information sharing scenarios where the sequence of users who have custody of the document is not predetermined. Security analysis and empirical results indicate that our scheme improves the security of the typical secure provenance schemes with comparable performance.