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Ronco, Eric. "Incremental polynomial controller networks two self-organising non-linear controllers /". Thesis, Connect to electronic version, 1997. http://hdl.handle.net/1905/181.
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Gremberg, Johanna. "Ökad kontroll för controllern : - hur en controller ska arbeta för att tillföra största möjliga verksamhetsnytta". Thesis, Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-12409.
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Sammanfattning Datum: 2011-05-16 Nivå: Magisteruppsats i Företagsekonomi, 15 hp Institution: Akademin för hållbar samhälls- & teknikutveckling, HST, Mälardalens högskola Författare: Johanna Gremberg 9 februari 1984 Titel: Ökad kontroll för controllern - hur en controller ska arbeta för att tillföra största möjliga verksamhetsnytta Handledare: Marie Mörndal Nyckelord: Controller, business controller, verksamhetscontroller, controllerns roll Frågeställning: Hur ska en controller inom Scanias produktion arbeta för att tillföra största möjliga verksamhetsnytta? Syfte: Undersökningen syftar till att beskriva och analysera hur en produktionscontroller på Scania ska arbeta för att tillföra största möjliga verksamhetsnytta. Metod: Studien är av en kvalitativ karaktär och baserades på sekundärdata i form av böcker och artiklar inom ämnet ␣controlling␣. Den datainsamlingsmetod som användes var personliga intervjuer utifrån ett selektivt urval med 7 respondenter från Scania. Analysmetoden bestod i att den teoretiska referensramen jämfördes med det som framkom vid datainsamlingen. Slutsatserna består av följande delar: Det är tydligt att det finns ett behov av en definition av controllerrollen, enligt såväl teori som empiri. Controllerns plats organisatorisk sett på Scania stämmer inte med synen i den teoretiska referensramen Vissa risker är förknippade med den organisationsform som valts, bl.a. är det av stor vikt att controllerns oberoende säkras Då delade meningar råder kring vilka arbetsmoment som en controller bör utföra och syftet med arbetet bör detta klargöras En controller bör stanna på sin tjänst under flera år för att nytta ska kunna tillföras verksamheten, dessutom är det viktigt att ha en mix i controllerpopulationen Vid en nyrekrytering bör en rad kvalifikationer och egenskaper bejakas hos de personer som är aktuella.
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Parmar, Akash, i Bremberg Isabella Kormos. "Vad innebär det empiriska fenomenet hållbarhetscontroller och vad arbetar denna med? : En explorativ studie på hållbarhetscontrollers roll i företag". Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-105881.
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Bakgrund och problem: Till följd av samhällets och företags ökade medvetenhet avseende hållbarhet har det banat ny väg för idéer om vad som utgör styrinformation i företag. Hållbarhet har blivit allt mer integrerat inom företag vilket har förändrat dess interna processer. Förändringar i de interna processerna har lett till att det inte enbart handlar om finansiell information längre, utan nu även hållbarhetsinformation. Som följd av detta har arbetsuppgifter omformats och utmanats vilket har ändrat controllerns arbete. Hållbarhet har fått ett sådant stort fokus att det har tillkommit en ny roll vid namn hållbarhetscontroller. Vad en hållbarhetscontroller är har inte diskuterats tidigare i litteraturen, vilket följande studie ämnar att göra. Syfte: Syftet med denna studie är att bidra med kunskap om vad en hållbarhetscontroller är och gör i en organisation. Detta kommer att undersökas genom att utreda vilka arbetsuppgifter och kunskaper en hållbarhetscontroller utför och besitter för att ytterligare förstå sig på rollen. Metod: Studien utgår från en kvalitativ metod som omfattar en explorativ undersökning. Den empiriska datainsamlingen gjordes genom semistrukturerade intervjuer, som har hållits med åtta hållbarhetscontrollers samt en hållbarhetsstrateg. Vidare har det använts elektroniska källor och dokument i form av arbetsannonser. Det teoretiska materialet är hämtat från vetenskaplig litteratur och det utgörs av controllerns bakgrund, arbetsuppgifter, roll, kunskaper samt hållbarhet. Slutsats: Utifrån studien anses hållbarhetscontrollers vara en kombination av en traditionell controller och business controller, därmed en hybrid. Detta då den arbetar med verksamhetens hållbarhetsredovisning men också som en affärspartner som bistår ledningen med underlag. Hållbarhetscontrollers fundamentala roll är hållbarhetsredovisningen vilket kopplas till en kamrer. Rollen analytiker var den roll som framkom tydligast i hållbarhetscontrollern och därmed konstaterades vara den viktigaste. Rollen som pedagog ser vi idag vara mindre då hållbarhet har blivit så pass integrerat, däremot innebär rollen idag att agera mer som en coach till följd av det stora fokuset på hållbarhet. Studien kunde därmed se att rollen har skiftat från att vara en traditionell “bean counter” till en affärspartner till organisationen. Hållbarhetscontrollern arbetar likt en controller där det som skiljer sig åt är att fokuset ligger på sociala och miljömässiga aspekter. Till följd av detta innebär det att kunskap kring hållbarhet och dess riktlinjer och ramverk var den viktigaste kunskapen för att besitta rollen. Vidare behövs god kunskap för verksamheten och ett innovativt tänkande vilket är viktigt för att ständigt kunna utveckla hållbarhetsarbetet och applicera nya riktlinjer i verksamhetens kontext. Antalet hållbarhetscontrollers på marknaden ökar gradvis och med hjälp av denna studie kommer fler företag få en inblick i varför företag väljer att ha en hållbarhetscontroller i deras verksamhet.Background and problem discussion: As a result of the company's and society's growing awareness of sustainability, it has established new ideas about what constitutes control information in companies. Increasingly, sustainability has been integrated within the organization, and the company's internal processes have changed. The change in the internal processes has developed it to be more than just financial information and sustainable information. Tasks have thus been reshaped and challenged, which has also changed the controller's work. Sustainability has received such a significant focus that a new role has been created, called a sustainability controller. A sustainability controller has not been discussed before in literature, which is the following study's intentions. Purpose: This study aims to contribute knowledge about what a sustainability controller is and does in an organization. This matter is investigated on what tasks and knowledge a sustainability controller performs and possesses to understand the role further. Methodology: The study is based on a qualitative method that includes an exploratory study. The empirical data collection was done through semi-structured interviews, which have been held with eight sustainability controllers and a sustainability strategist—furthermore, utilizing electronic sources and documents in the form of job advertisements. The theoretical material is obtained from the scientific literature on background checks, tasks, roles, knowledge, and sustainability. Conclusion: According to this study, sustainability controllers are considered a hybrid of traditional controllers and business controllers. It works with a business's sustainability reporting and being a business partner that assists the management with data. The fundamental role of sustainability controllers is the sustainability report, which is linked to a bean counter. The role analyst emerged most clearly in the sustainability controller and was the most significant. Today's role as an educator is minor as sustainability has become so integrated; however, the role needs to act more as a coach due to the significant focus on sustainability. Thus, the study could see that the role has shifted from being a traditional bean counter to a more business partner to the organization. The sustainability controller works like a controller where what differs is that the focus is on social and environmental aspects. As a result, knowledge about sustainability, the guidelines, and the framework was essential to possess the role. Furthermore, good knowledge is expected for the business and innovative thinking, which is vital to constantly develop sustainability work and apply new guidelines in the business context. The number of sustainability controllers on the market will gradually increase. With the help of this study, more companies will gain insight into why companies choose to have a sustainability controller in their operations.
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Nilvetti, Fabio. "Controllo delle vibrazioni mediante l'uso di PAC (Programmable Automation Controller)". Doctoral thesis, Universita degli studi di Salerno, 2012. http://hdl.handle.net/10556/368.
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2010 - 2011Con l'espressione `Vibration Control' si intende l'insieme delle tecniche e dei dispositivi che consentono di mitigare in modo rapido, a dabile e preciso le vibrazioni di macchine o strutture, dovute al loro stesso funzionamento o a causa di forze esterne. Nella realizzazione dei sistemi di controllo delle vibrazioni assumono oggi primaria rilevanza sul piano tecnico ed economico l'hardware impiegato. Attuatori elettrici e oleodinamici, dispositivi passivi,sensori, convertitori elettronici e unit a di controllo rappresentano una parte fondamentale di tali sistemi e ne influenzano largamente le prestazioni. Il contributo del singolo componente alle prestazioni complessive del controllo è tuttavia valutato compiutamente solo se ci si pone in un'ottica di sistema, nella quale le mutue interazioni tra componenti elettronici, parti meccaniche e algoritmi di controllo trovano la loro corretta sintesi. Nei sistemi di controllo delle vibrazioni, è decisiva la scelta del `controller'. Scopo del presente lavoro e stato appunto quello di sviluppare un sistema di controllo delle vibrazioni che coniughi le diverse esigenze di precisione, determinismo e elevata velocità di servo-aggiornamento, tipiche di un circuito stampato, alle esigenze di flessibilità ed economicità, tipiche delle soluzioni basate su DSP, e alle elevate capacità di calcolo tipiche di un pc. Per far ciò il ruolo di controller e a dato ad un dispositivo PAC (Programmable Automation Controller) basato su tecnologia FPGA (Field Programmable GateArray) che consente di codifcare, in modo rapido, le funzionalit a richieste al controllo su un dispositivo programmabile di tipo hardware e per questo dalle prestazioni paragonabili a quelle di un circuito stampato. With the expression `Vibration Control' refers to the set of techniques and devices that let you mitigate quickly, reliably and accurately the vibrations of machines or structures, due to themselves operation or due to external forces. In the implementation of vibration control systems today assume pri- mary importance, in the technical and economic terms, the hardware used. Electrical and hydraulic actuators, passive devices, sensors, electronic con- verters and control units are a fundamental part of these systems and they greatly a ects on the performance. In systems of vibration control, is decisive the choice of the controller. The purpose of this work was to develop a system of vibration control which combines the various requirements of precision, determinism and high-speed servo-update, typical of a printed circuit board, the exibility and economy typical of solutions based on DSP, and high computing power of a typical PC. To do this, the role of controller is assigned to a device (PAC programma- ble automation controller) based on technology FPGA (Field Programmable Gate Array) which allows to encode, quickly, the required functionalities to the control, on a programmable hardware device and for this with perfor- mance comparable to that of a printed circuit board. [a cura dell'autore]
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Andersson, Robby. "FPGA design of a controller for a CAN controller". Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1557.
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This diploma work describes how an FPGA is designed to control a CAN controller. It describes the different tools used when working with Actel’s design tools and the sequence of work applied. It gives a short overview of a multiplexer, the CAN bus, an analog/digital-converter and some more information on the actual FPGA. It also brings up the design process of the FPGA, planning, coding, simulating, testing and finally programming the FPGA. The different parts implemented in the FPGA are a shift-register and two state- machines that are connected with each other. They work together to control the SJA1000 CAN controller made by Philips. They also receive data from the analog/digital-converter that they forward onwards to the CAN controller that forward the data on the CAN bus.
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Färm, Josefine, i Caroline Jönsson. "Shedding light on the controller profession : controllers’ value-creation in Swedish organizations". Thesis, Högskolan Kristianstad, Fakulteten för ekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-18558.
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Problematization: Financial departments have during the recent years developed due to environmental changes, and so has the controller profession. Controllers are working hard in the shadow of the CFO, together with an unclear definition over their tasks. By shedding light on the controller can their value-creation for the organization be defined. Purpose: The purpose of this research is to examine developments of the controller profession from a Swedish organizational context. Furthermore, this thesis aims to investigate if there is an expansion of the controller professions role, within organizations, that affecting their ability to create value. Methodology: The research has been conducted with a qualitative approach. In this study was 8 interviews performed with controllers in Swedish organizations. This research further examines the controller profession from a general context, in other words, without no specific industry orientation. Findings /conclusions: The findings of this study argue for that there still exist an indistinct definition over the controller profession, thus developments within their role can be confirmed. The traditional view of controllers’ work should therefore be prolonged. Controllers are still just as accountable for financial assignment, the role has however, developed to become involved in most of parts organizations’ businesses and adapted an advisory role. The advancements have made the controller role to a central position with great ability to create value within an organization, yet, to what extend depends on various factors and aspects.
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Winberg, Ulf. "DRAM Controller Benchmarking". Thesis, Computer Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-19190.
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Since a few years, flat screen TVs, such as LCD and plasma, has come to completelydominate the market of televisions. In a SoC solution for digital TVs, severalprocessors are used to obtain a decent image quality. Some of the processorsneed temporal information, which means that whole frames need to be storedin memory, which in turn motivates the use of SDRAM memory. When higherdemands of resolution and image quality arrives, greater pressure is put on theperformance of the SoC memory subsystem, to not become a bottleneck of thesystem.
In this master thesis project, a model of an existing SoC for digital TVs is usedto benchmark and evaluate the performance of an SDRAM memory controllerarchitecture study. The two major features are the ability to reorder transactionsand the compatibility with DDR3. By introducing reordering of transactions, thechoice is given to the memory controller to service memory requests in an orderthat decreases bank conflicts and read/write turn arounds. Measurements showthat a utilization of 86.5 % of the total available bandwidth can be achieved, whichis 18.5 percentage points more, compared to an existing nonreordering memorycontroller developed by NXP.
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Murray, Nicholas Durante. "Nonlinear PID controller". Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03242009-040653/.
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Karim, Omair. "Electronic frequency controller". Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-690.
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The project was performed with universal electronics which is based in Karachi Pakistan at PRD Lab. Due to the energy crises the industry is switching to alternative power generators. The main issue with the maintenance of the generator is the constant failure of the controller which has to be imported ,the purpose of this project is to make a cheap efficient Electronic Frequency Controller (EFC) that can be used in almost all kinds of generators. The work was tested on Multisim and then soldered together. To make it functional the frequency generation was converted to voltage which was connected to the controller. The controller was joined with the actuator and the actuator opens the amount of fuel needed to run the generator so that there is a smooth constant voltage. If we have high frequency from the input like a heavy machinery is operational then the actuator will widen its opening and when the frequency is low the actuator will open appropriately. The presentation was a successful one but due to time deadline few minor adjustment could be made to make it more effective as discussed later.
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Clancy, Daniel J. "Multiresolutional controller design /". The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487946103565287.
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Henningsson, Mathilda, i Alisa Klokic. "Controllerns roll - från bean counter till affärspartner : En kvalitativ innehållsanalys av den svenska arbetsmarknaden för en controller". Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-96745.
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Bakgrund och problemdiskussion: Allt eftersom verksamheter och ekonomistyrning utvecklas så utvecklas även controllerns roll. Controllern sägs ofta ha gått från att vara en bean counter till att vara en affärspartner men huruvida denna övergången har skett på den svenska marknaden råder det fortfarande stor oklarhet kring. Det finns även de som hävdar att endast en expansion av controllerns roll är aktuell i dagens läge. Denna tvetydighet är det som motiverar vidare studier av controllerns roll där efterfrågade arbetsuppgifter och egenskaper på den svenska marknaden idag studeras. Syfte: Syftet är att bringa klarhet i vad företag söker för egenskaper hos en controller och erbjuder för arbetsuppgifter i förhållande till vilken sektor organisationen verkar inom, offentlig eller privat, men även vilken storlek organisationen har. Studien ämnar bidra med kunskap om controllerns roll på dagens svenska arbetsmarknad. Metod: Studien utförs genom en kvalitativ innehållsanalys av samtliga jobbannonser publicerade på Arbetsförmedlingens tjänst Platsbanken funna med sökordet controller. Slutsats: Controllerns roll varierar beroende på vilken sektor verksamheten verkar inom och det är inte möjligt att tillskriva controllern en övergripande roll. På grund av komplexiteten i controllerns arbete 3 krävs det att controllern besitter olika roller. De främst förekommande rollerna för en controller är coach och analytiker men rollerna som kamrer och pedagog förekommer också. Nyckelord: Controller, bean counter, affärspartner, business controller, accounting controller, controllerns roll
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Johansson, Sanna, i Maria Waderoth. "Controllerns funktioner - En studie i vad som skiljer organisationsformer åt i användandet av controllern". Thesis, Halmstad University, School of Business and Engineering (SET), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-2671.
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I dagens platsannonser frågas det ofta efter controllers, men få vet egentligen vad yrket innebär eftersom rollen skiljer sig från arbetsplats till arbetsplats. Vi ville studera detta diffusa begrepp för att få en större klarhet i vad titeln innebär och vilka arbetsuppgifter som är karakteristiska controlleruppgifter. Syftet med uppsatsen är att beskriva vilka arbetsuppgifter som har störst betydelse i olika organisationer. Utifrån tidigare forskning har vi skapat en modell som visar en uppdelning mellan olika organisationsformer och vilken/vilka av controllerns funktioner som blir extra betonad i de olika.
Vi har gjort en undersökning omfattande 30 telefonintervjuer med controllers eller personer med motsvarande arbetsuppgifter. Intervjuerna har utgått från en intervjuguide med både öppna och slutna frågor.
Då vi analyserade vårt empiriska material med hjälp av statistiska tester kom vi fram till att de arbetsuppgifter controllern värderar högst är rapportering, strategiutveckling samt budgetanalys. Vårt material visade även att användandet av controllern skiljer sig i olika organisationsformer. Utifrån våra 22 hypoteser kunde vi statistiskt säkerställa att controllers arbetande i organisationer som befinner sig i en bransch med utmärkande låg eller hög osäkerhet eller i äldre organisationer lägger mindre vikt på budgetering och budgetanalys samt att controllers i den offentliga sektorn lägger större vikt på internkontroll.
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RANJAN, SHILPA. "MINIMISATION OF TORQUE RIPPLE OF HYSTERESIS CURRENT CONTROLLED PMSM USING PI-RES CONTROLLER". Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18871.
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For the better dynamic performance of PMSM & minimum ripples in torque field
oriented control (FOC) is implemented. Some intricate methods are applied for
controlling & for the better performance of permanent magnet synchronous machine.
For highly performed motor drives flux estimation is always important. The rotor flux
estimation model is designed using high pass filter (HPF) to solve the problem caused
due to integrator applied in the flux estimation. Also phase locked loop (PLL) is
introduced in the model. It is known PMSM is used wherever smooth torque is
required. But because of some application of power electronics devices in the
modelling often reveals the cogging torque that led to ripple in torque. The key
drawback of PMSM is that it produces ripples in the induced torque, which are
undesirable in these high-performance applications. Torque ripples led to speed
oscillations, which cause PMSM servo output to worsen. The ripples in torque
produces mechanical vibrations and noise in the machine that decreases the life of
machine. The smoothness of torque is considered as the essential requirement for high
performance of permanent magnet synchronous motors. As a consequence, the
primary issue in PMSM's control problem is ripple minimization. Since many torque
ripples are caused by non-ideal back EMF in stators, a number of techniques for
reducing ripples caused by this phenomenon have been developed. PI controllers are
generally preferred but this got affected by the variations in parameters, load condition
and also on speed. To overcome this problem, a resonant controller is introduced in
accordance with PI for the minimization of ripples and to get the better performance.
The performance of control methods of both PI & PI-RES controller is compared.
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Bengtsson, Carl Johan. "SmartMedia-controller på chip". Thesis, Linköping University, Department of Electrical Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1127.
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This report deals with the design of a controller for SmartMedia™ flash memory cards, based on a hardware description found in the SmartMedia™ Interface Library - SMIL.
The design was made on logic gate level, using standard cells in OrCAD Capture. After simulation of the design in PSpice A/D, it was exported as an EDIF netlist, which was used to make a chip layout in L-Edit, a layout tool for making integrated circuits. The layout was made using a method called Standard Place and Route - SPR, where the layout tool places standard cells from a library and connects them according to the EDIF netlist.
A netlist which could be simulated in PSpice was extracted from the finished chip layout to verify that the function of the design was the same as before the transition from schematic to layout.
The standard cells in the library used to make the chip layout have to meet certain criteria in order for both SPR and extraction to work and this is also discussed.
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SAAD, SHAIKH MUHAMMAD. "Quadrocopter Fuzzy Flight Controller". Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-26421.
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Quadrocopter is an aerial vehicle platform which has become very popular among researchers in the recent past due to the advantages it offers over conventional helicopters. Quadrocopter is very simple and unique, but it is inherently unstable from aerodynamics point of view. In recent past researchers have proposed many control schemes for quadrocopter. In this thesis we present fuzzy logic controller for quadrocopter. After brief introduction brief hardware details are given that is used in this thesis. After that design procedure for the fuzzy controller is presented. Then the designed fuzzy controller is tested in Hardware In Loop (HIL) setup. The experimentation to validate the functionality and applicability of the designed controller were performed in contrained setup due to some technical problems. The results of the experiments were satisfactory and it is concluded that it is possible to stabilize quadrocopter with fuzzy logic controller.
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Diao, Lili. "Nonlinear bounded controller design". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ59374.pdf.
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Chang, Wei-Chieh. "Transputer-based robot controller /". Online version of thesis, 1990. http://hdl.handle.net/1850/11557.
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Dahm, Rickard. "Autotuning of RPM controller". Thesis, Linköpings universitet, Fysik och elektroteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-101995.
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Under detta projekt som utfördes på Scania CV AB undersöktes möjligheten att använda sig av en adaptiv regulator för att reglera motorvarvtalet på en lastbilsmotor som driver utrustning via ett kraftuttag. Fördelen med att använda sig av adaptiv reglering istället för den parameterstyrda PID reglering som används idag är att regulatorn kan klara av fler utrustningstyper. Dagens regulator kan få problem vid stora belastningsmoment eller tröghetsmoment. Detta kan lösas med adaptiv reglering. I rapporten presenteras en modellbaserad regulator som använder systemets tröghetsmoment. Då systemets tröghetsmoment är okänt ges även förslag på hur detta skulle kunna estimeras. Den modellbaserade regulatorn visar sig vara mycket effektiv då skattningen av tröghetsmomentet lyckas. Det Kalmanfilter som designats för att estimera systemet fungerar dock ej för alla önskvärda fall och en fortsatt studie på hur denna design ska se ut krävs innan regulatorn testas på ett verkligt system.
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Watson, Wyatt. "USB remote machine controller". Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/17366.
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Wellstead, Kevin. "Robust polynomial controller design". Thesis, Brunel University, 1991. http://bura.brunel.ac.uk/handle/2438/4866.
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The work presented in this thesis was motivated by the desire to establish an alternative approach to the design of robust polynomial controllers. The procedure of pole-placement forms the basis of the design and for polynomial systems this generally involves the solution of a diophantine equation. This equation has many possible solutions which leads directly to the idea of determining the most appropriate solution for improved performance robustness. A thorough review of many of the aspects of the diophantine equation is presented, which helps to gain an understanding of this extremely important equation. A basic investigation into selecting a more robust solution is carried out but it is shown that, in the polynomial framework, it is difficult to relate decisions in the design procedure to the effect on performance robustness. This leads to the approach of using a state space based design and transforming the resulting output feedback controller to polynomial form. The state space design is centred around parametric output feedback which explicitly represents a set of possible feedback controllers in terms of arbitrary free parameters. The aim is then to select these free parameters such that the closed-loop system has improved performance robustness. Two parametric methods are considered and compared, one being well established and the other a recently proposed scheme. Although the well established method performs slightly better for general systems it is shown to fail when applied to this type of problem. For performance robustness, the shape of the transient response in the presence of model uncertainty is of interest. It is well known that the eigenvalues and eigenvectors play an important role in determining the transient behaviour and as such the sensitivities of these factors to model uncertainty forms the basis on which the free parameters are selected. Numerical optimisation is used to select the free parameters such that the sensitivities are at a minimum. It is shown both in a simple example and in a more realistic application that a significant improvement in the transient behaviour in the presence of model uncertainty can be achieved using the proposed design procedure.
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Goddard, Philip John. "Performance-preserving controller approximation". Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361711.
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Akkam, Mazen. "Microcomputer based heat controller". Thesis, Kansas State University, 1985. http://hdl.handle.net/2097/9816.
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Griesebner, Klaus. "Model-based Controller Development". Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-34929.
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Model-based design is a powerful design technique for embedded system development. The technique enables virtual prototyping to develop and debug controllers before touching real hardware. There are many tools available covering the distinct steps of the design cycle including modeling, simulation, and implementation. Unfortunately, none of them covers all three steps. This thesis proposes a formalism coupling the model and the implementation of a controller for equation-based simulation tools. The resulting formalism translates defined controller models to platform specific code using a defined set of syntax. A case study of a line-following robot has been developed to illustrate the feasibility of the approach. The prototype has been tested and evaluated using a sequence of test scenarios of increasing difficulty. The final experiments suggest that the behaviors of both modeled and generated controllers are similar. The thesis concludes that the approach of model-implementation coupling of controllers in the simplest form is feasible for equation-based tools. This allows it to conduct the whole model-based design cycle within a single environment.
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Izumi, Shinsaku. "Studies on Controller Networks". 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199448.
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Park, Jisang. "Controller certification the generalized stability margin inference for a large number of MIMO controllers /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3296803.
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Thesis (Ph. D.)--University of California, San Diego, 2008.Title from first page of PDF file (viewed Mar. 24, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 98-100).
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Nilsson, Kajsa, i Jakob Persson. "Hur speglas controllern i andras ögon? : En kvalitativ studie kring controller-yrket utifrån förväntningar". Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-39780.
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Bakgrund: Teknologins utveckling samt den ökade globaliseringen har gjort dagens controller till ett komplext yrke som berör många aspekter. Vi vill behandla ämnet utifrån personer som ska anställa en controller eftersom de är involverade i controller-rollen. Vi undrar hur dessa personer egentligen kan veta vad de söker hos en controller när det råder en så stor osäkerhet kring begreppet. Syfte: Syftet med vår uppsats är att undersöka vilka förväntningar som arbetsgivare har på en controller samt analysera dessa med stöd av tidigare forskning och litteratur. Uppsatsen fokuserar på dels vad controllern skall arbeta med och hur arbetsuppgifterna utvecklas och dels på personlighetsdrag och färdigheter. Vi vill få en ökad förståelse på hur arbetsgivare via sina förväntningar tolkar begreppet controller. Metod: En kvalitativ forskningsmetod med abduktiv ansats. Empirin är insamlad via semistrukturerade intervjuer med anställningsansvariga och kompletterad med information från verksamheters platsannonser. Slutsats: Vi drar slutsatsen utifrån vår studie att förväntningarna på controllers är i grunden relativt lika, men skiljer sig även i många aspekter.Ytterligare en slutsats är att det råder till viss del delade meningar beträffande hur respondenterna vill och anser att controller-rollen ska utvecklas. Studien ger indikationer på att det råder en del osäkerhet kring begreppet controller.Background: Technology development and increased globalization has made the Controller profession to something complex that involves many aspects. We want to process this subject from the point of view of people who is about to hire a Controller. We wonder how these people know what they are looking for since it is a large uncertainty about the concept. Purpose: The purpose of this essay is to examine the expectations that employers have towards a Controller and analyze these based on previous research and literature. The essay will focus on partly the job assignments and its developing, and partly on the personality and skills. We want to get a better understanding about how the employers, via their expectations, interprets the concept of Controller. Method: The purpose of this study has been achieved through an abductive method. The empirical data was collected through semi-structured interviews with people in charge of hiring the Controllers and complemented with job advertisings. Conclusion: The expectations of the Controller are fundamentally quite similar but have some differences in several aspects. There are different opinions from the respondents how the Controller role should develop in thefuture. The study indicates that there is some uncertainty in the concept that is Controller.
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Claro, Érica Rejane Pereira. "Localização de canais afetando o desempenho de controladores preditivos baseados em modelos". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/149927.
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O escopo desta dissertação é o desenvolvimento de um método para detectar os modelos da matriz dinâmica que estejam degradando o desempenho de controladores preditivos baseados em modelos. O método proposto se baseia na análise de correlação cruzada entre o erro nominal do controlador em malha fechada e a uma estimativa da contribuição de cada canal para o cálculo da saída, filtrada pela função de sensibilidade do controlador. Esse método pode ser empregado na auditoria de controladores com variáveis controladas em setpoints e/ou com variáveis que operem entre faixas, como é usual de se encontrar na indústria. Esta dissertação apresenta os resultados da aplicação bem sucedida do método no sistema de quatro tanques (JOHANSSON, 2000), para o qual três cenários foram avaliados. No primeiro cenário, o método localizou corretamente discrepâncias de ganho e de dinâmica de modelos de um controlador preditivo baseado em modelos (Model-based Predictive Controller, ou controlador MPC). No segundo, o método foi utilizado para avaliar a influência de uma variável externa para melhorar o desempenho de um controlador afetado por distúrbios não medidos. No terceiro cenário, o método localizou canais com modelos nulos que deveriam ser incluídos na matriz de controle de um controlador MPC de estrutura descentralizada. Os resultados deste estudo de caso foram comparados com aqueles obtidos pelo método proposto por BADWE, GUDI e PATWARDHAN (2009), constatando-se que o método proposto é mais robusto que o método usado na comparação, não demandando ajustes de parâmetros por parte do usuário para fornecer bons resultados. A dissertação inclui também um estudo de caso da aplicação industrial do método na auditoria de desempenho de um controlador preditivo linear de estrutura descentralizada, com doze variáveis controladas, oito manipuladas e quatro distúrbios não medidos, aplicado a um sistema de fracionamento de propeno e propano em uma indústria petroquímica. A auditoria permitiu reduzir o escopo de revisão do controlador a dezenove canais da matriz, sendo que quatorze destes correspondiam a canais com modelos nulos que deveriam ser incluídos na matriz. A eficácia do método foi comprovada repetindo-se a avaliação da qualidade de modelo para todas as variáveis controladas.The scope of this dissertation is the development of a method to detect the models of the dynamic matrix that are affecting the performance of model-based predictive controllers. The proposed method is based on the cross correlation analysis between the nominal controller error and an estimate of the contribution of each channel to the controller output, filtered by the controller nominal sensitivity function. The method can be used in the performance assessment of controllers employing variables controlled at the setpoint and/or those controlled within ranges. This dissertation presents the results of the successful application of the method to the quadruple-tank process (JOHANSSON, 2000), for which three scenarios were evaluated. In the first scenario, the method correctly located gain and dynamic mismatches on a model-based predictive controller (MPC controller). In the second one, the method was used to evaluate the influence of an external variable to improve the performance of a controller affected by unmeasured disturbances. In the third scenario, the method located null models that should be included in the dynamic matrix of a decentralized MPC controller. The results of the three scenarios were compared with the ones obtained through the method proposed by BADWE, GUDI e PATWARDHAN (2009). The proposed method was considered more robust than the reference one for not requiring parameters estimation performed by the user to provide good results. This dissertation also includes a case study about the application of the method on the performance assessment of an industrial linear predictive controller of decentralized structure. The controller has twelve controlled variables, eight manipulated variables, and four unmeasured disturbances and is applied to a propylene-propane fractionation system of a petrochemical industry. The performance assessment allowed reducing the scope of the controller revision to nineteen channels of the models matrix, fourteen of which were null models that should be included in the controller. The efficacy of the proposed method was confirmed by repeating the model quality evaluation for all the controlled variables.
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Hermansson, Olaf. "Resistance spot welding equipment controller - Beijer iX T7B Softmotion based weld equipment controller". Thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-28857.
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The goal of the project is to evaluate a new setup for the company Iberobot Svenska AB, using HMI and PLC, for resistance spot welding equipment controller. The purpose of the controller is to control the weld process; weld power and time. One of the question raised is if this setup could be used as an RWE controller and thereby be able to re-place an old proprietary controller called TEC6000. A prototype is built compatible with current single phase RWE and literature study is conducted to answer this question. The new setup is based on Beijer iX T7B Softmotion which includes an HMI and a PLC with EtherCAT support. EtherCAT input and output modules from Beckhoff are chosen because they can handle the speed required by the weld process. The controller is implemented using theory for RMS value, timing diagram and state diagram based on weld process. The prototype is revised three times. A zero crossing detector is implemented. A control element driver using opto-triac is implemented. Measurements using oscillo-scope are conducted which shows that the controller is able to start a weld, but zero crossing detection is unstable and further research into this and current regulation is needed before an end user product can be made.
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Sousa, Rafael Vieira de. "CAN (Controller Area Netwoork): uma abordagem para automação e controle na área agrícola". Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-30102007-115747/.
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Padrões internacionais baseados no protocolo de comunicação digital serial CAN - Controller Area Network - têm sido elaborados e adotados em aplicações que utilizam eletrônica embarcada em máquinas e implementos agrícolas. No Brasil, a aplicação do CAN é restrita a máquinas e implementos importados. Verifica-se também, a necessidade de fornecer subsídios e auxílio às pequenas e médias indústrias nacionais de equipamentos agrícolas, para que estas possam oferecer equipamentos compatíveis no mercado, através da implementação desses padrões em seus produtos. Este trabalho apresenta a pesquisa de circuitos integrados, transceptores, dispositivos de instrumentação mais elaborados (receptores GPS, computadores embarcáveis, computadores portáteis, rádios digitais e atuadores e sensores inteligentes) e protocolos de alto nível para o desenvolvimento de sistemas baseados no CAN. A sistematização dos resultados origina um documento referencial prático do CAN para projetos de máquinas e implementos agrícolas, e para automação de sistemas agrícolas, como estufas, sistemas de irrigação e criadouros.International standards based on the digital data communication protocol CAN - Controller Area Network - are being developed and applied to embedded electronics in agricultural and environmental area to integrate different devices. In Brazil, the application of CAN is restricted to imported machines. Small and medium manufactures also need some support to apply this technology and offer compatible equipment to the market. This work present the searching of integrated circuits, transducers, elaborated devices (GPS receivers, embedded computers, handled computers, digital radios and intelligent sensors and actuators) and high level protocols for the development CAN based systems. The systematization of the results generate a practical reference documentation of CAN for agricultural machinery (tractor, combine and implements) designs and agricultural automation designs, such as irrigation, greenhouse and livestock systems.
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Glenn, Russell David. "A reduced order controller design method based on the Youla parameterization of all stabilizing controllers". Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1174396903.
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Goodman, Ryan. "Wi-fi evapotranspiration irrigation controller". Click here to view, 2010. http://digitalcommons.calpoly.edu/eesp/22/.
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Thesis (B.S.)--California Polytechnic State University, 2010.Project advisor: James Harris. Title from PDF title page; viewed on Apr. 19, 2010. Includes bibliographical references. Also available on microfiche.
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Chang, Kuang-Yuan, i 張廣元. "Controller Tuning for Vector-Controlled Induction Motor Drives". Thesis, 1997. http://ndltd.ncl.edu.tw/handle/87765522089398234158.
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碩士國立台灣工業技術學院
電機工程技術研究所
85
This thesis investigates the controller parameter tuning method for both a closed-loop vector-controlled and a sensorless vector-controlled induction motor drives. Asystemmatic procedure based on root-locus and frequency renponse techniques is proposed to tune the controller parameters. The thesis also proposes the design of a rotor flux observer for improving the low-speed performance of sensorless vector-controlled drive. In hardware implementation the 80196MC single-chip micro- processor is used for control software development. In estimatingthe rotor flux, the actual stator voltages are not measured, insteadthe stator voltage commands are used. The cost of the system isreduced since no voltage sensor is used for stator voltage sensing.Also, the rotor flux is estimated using the rated flux value and alow-pass filter so as to compensate the deviation caused by theintegrator during low-speed operation. Adeadtime compensationcontrol board is added to the hardware, which results in goodperformance during low speed with loads. The experimental results show good performance for both the closed-loop and the sensorless vector-controlled drives under no-load and loading conditions at various speeds.
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Kuang-Yuan, Chang, i 張廣元. "Controller Tuning for Vector-Controlled Induction Motor Drives". Thesis, 1997. http://ndltd.ncl.edu.tw/handle/21287027134531243267.
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碩士國立臺灣科技大學
電機工程技術研究所
86
This thesis investigates the controller parameter tuning method for both a closed-loop vector-controlled and a sensorless vector-controlled induction motor drives. Asystemmatic procedure based on root-locus and frequency renponse techniques is proposed to tune the controller parameters. The thesis also proposes the design of a rotor flux observer for improving the low-speed performance of sensorless vector-controlled drive. In hardware implementation the 80196MC single-chip micro- processor is used for control software development. In estimatingthe rotor flux, the actual stator voltages are not measured, insteadthe stator voltage commands are used. The cost of the system isreduced since no voltage sensor is used for stator voltage sensing.Also, the rotor flux is estimated using the rated flux value and alow-pass filter so as to compensate the deviation caused by theintegrator during low-speed operation. Adeadtime compensationcontrol board is added to the hardware, which results in goodperformance during low speed with loads. The experimental results show good performance for both the closed-loop and the sensorless vector-controlled drives under no-load and loading conditions at various speeds.
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Wang, Chin-Li, i 王進力. "PID Controller Tuning for Vector-Controlled Induction Motor Drivers". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/80550319879059326660.
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碩士淡江大學
電機工程學系
89
Title of Thesis Total pages:64 PID Controller Tuning for Vector-Controlled Induction MotorDrivers Key word: Proportional-Integral-Derivative, performance index, Simulated Annealing Name of Institute: Graduate Institute of Electrical Engineering, Tamkang University Graduate date:July,2001 Degree conferred:Master Name of student: Wang Chin-Li Advisor:Dr.Ying-Tung Hsiao 王 進 力 蕭 瑛 東 博 士 Abstract: Proportional-integral-derivative (PID) controller is a well-known technique for industrial control processes. This is due to its simple structure and robust performance in a wide range of operating conditions. The design of such a controller requires specification of three parameters: proportional gain (Kp), integral time constant (Ki), and derivative time constant (Kd), Traditionally, the problem has been handled by a trial and error approach. Design engineers must tune PID controllers manually and usually take considerable time. This work presents a optimal approach to design PID controllers. The problem formulation of the design PID controller adopts four performance index maximum overshoot, rise time, setting time and integral absolute error as the objective. Moreover, we propose a solution algorithm based on the simulated annealing technique to determine the controller parameters for getting a well performance for a given plant. Simulation results demonstrate that better control performance can be achieved in comparison with Ziegler-Nichols method.
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Shyur, Dar-Ren, i 徐達仁. "Robust Controller Design for a Field-Oriented Controlled Induction Motor". Thesis, 1995. http://ndltd.ncl.edu.tw/handle/28767400918533420406.
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碩士國立成功大學
電機工程研究所
83
A field-oriented controlled induction motor enbles decoupling control of touque and flux similar to the control of a seperate- ly excited dc motor. The conventional field-oriented control me- thod, although simple to implement, is sensitive to plant para- meters.Therefore,to solve the problem of performance degradation due to parameter variations and unmodelled uncertainties in a field-oriented controlled induction motor , a robust control scheme is proposed. In this thesis, the plant parameters and un- certainty analysis are estimated by measured data and system identification method. Furthermore, a robust controller is deve- loped by means of H-inf theoretical analysis technique and choosing weighting functions appropriately. As a result , the approach can achieve parameter-insensitive control responses with fast dynamic and robust performance. The effectiveness is verified by simulation and experiment.
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Marapally, Prasanth. "Space Vector Controlled PMSM Drive Based on Fuzzy Logic Controller". Thesis, 2017. http://ethesis.nitrkl.ac.in/8943/1/2017_MT_MPrasanth.pdf.
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To improve the dynamic performances of Permanent Magnet Synchronous Motor (PMSM) drive, a novel implementation of speed controller based on adaptive fuzzy logic is presented in this project. Using the output of the fuzzy speed controller (FC), the quadrature axis current reference value can be obtained.
The basic principle of vector control is to decouple the stator current to get direct axis and quadrature axis components. The vector control strategy is formulated in the synchronously rotating reference frame. The steady-state response of the predictive control can be effectively improved by using a simple time delay control approach. To increase the performances of PMSM drive, an adaptive speed controller based on fuzzy logic is proposed. The availability of the PMSM parameters is confirmed by computer simulations. The results of simulation have shown that the PMSM drive with the proposed control scheme has the merits of simple structure, robustness, quick tracking performance.
In this project, the conventional PI speed controller has been replaced by the fuzzy controller. It combines the capability of fuzzy reasoning in handling uncertain information and the ability to compensate of the disturbance voltage observer on-line. The proposed control scheme has been testified by simulation, the results indicate the PMSM drive with the adaptive fuzzy controller will have the ability of quick recovery of the speed from any disturbances and parameters variation. Accordingly, the proposed PMSM drive will have better dynamic performances and robustness.
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Hwang, Yeou Yuan, i 黃友元. "A Study of Self-Organized Fuzzy Controller to Improve PID-Controller and Robust-Controller". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/61566220784745251989.
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碩士國立成功大學
造船及船舶機械工程學系
87
The performance of fuzzy logic controller can be improved though the following methods: the structure of controller , the tuning of parameters and the regulating of control rules。 The last one is the most effective among them。Rules self-regulating fuzzy controller is one of those being able to modify fuzzy automatically。Now we prefer a algorithm to realize the technique of self-organized fuzzy controller to adjust change of error gain。It can control close loop system freely arrive steady state time。The self-organized fuzzy controller is assist controller to improve the performance of a master PID-controller and Η∞ controller and result of computer simulation show that the complex controller(Fuzzy-Η∞ controller or Fuzzy-PID controller) is better than the original PID controller and PID controller no matter in the reduction of rise time , overshoot , or settling time 。
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Pillay, Anand. "A DSP-based digital controller for a thyristor controlled series capacitor". Thesis, 2007. http://hdl.handle.net/10413/2245.
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The power transfer capability of long high voltage transmission lines is often limited by the inductive reactance of the transmission line. Series compensation is in some instances employed to lower the inductive reactance of the transmission line which increases the transmission line power transfer capability. Numerous methods have been employed to provide series compensation of a transmission line. One such method is to use a thyristor controlled series capacitor (TCSC). A thyristor controlled senes capacitor (TCSC) belongs to the flexible altemating CUlTent transmission systems (FACTS) family of devices. It is a variable capacitive and inductive reactance device that can be used to provide series compensation in high voltage transmission lines. One of the significant advantages that a TCSC has over other series compensation devices is that the TCSC's reactance is instantaneously and continuously variable. This means that the TCSC can be used not only to provide series compensation but can also be used to enhance the stability of the power system. However accurate control of the TCSC is challenging due to its highly non-linear variable reactance characteristic. The TCSC consists of back to back thyristors that control the reactance of the TCSC. By changing the trigger angle of these back to back thyristors it is possible to vary the reactance of the TCSC. The reactance characteristic becomes highly non linear at higher levels of compensation; at such operating points the trigger angle of the thyristors needs to be accurately controlled to avoid small variations in the thyristor trigger angle causing significant variation in the reactance of the TCSC. Literature has shown that there is an acceptable limit to the resolution of the thyristor trigger angle based on the parameters of the components used in the TCSC. If a controller is developed to meet this acceptable level of thyristor trigger angle resolution, then the operation of the TCSC will also be acceptable and its operation will not result in unwanted fluctuations in the transmission line variables. This thesis details the development of such a controller for use in a laboratory-scale TCSC. The thesis then goes on to present the practical results obtained from laboratory experiments on the laboratory-scale TCSC with the TCSC triggering controller being used to control the operation of the laboratory-scale TCSC. For purposes of comparison and benchmarking, a detailed simulation model of the laboratory-scale TCSC is developed to take into account the non-ideal properties of the components used in make-up of the laboratory-scale TCSC since the theoretical model is derived assuming ideal conditions. The detailed simulation model is also used to aid in the redesign the power circuit of the laboratory-scale TCSC in an attempt to improve the perfonnance of the laboratory-scale TCSC by obtaining better agreement between the theoretical and practical results. The redesigned laboratory-scale TCSC is used to obtain practical results to COnfill11 the findings of the simulation studies. Finally, the TCSC triggering controller is tested using a real time digital simulator (RTDS). The simulation model developed on the RTDS consisted of a two area, four generator power, with the TCSC connected between the two areas. The RTDS simulation model is used to study the ability of the TCSC to damp inter-area mode oscillations and hence the RTDS simulation model incorporated a power oscillation controller. The input of TCSC triggering controller was "connected" to the power oscillation damping controller and the output of the TCSC triggering controller was "connected" to the thyristors of the TCSC.Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2007.
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Yang, Hui-tsung, i 楊慧聰. "A Design of Fuzzy Speed Controller for Sensorless Vector-Controlled Inverter". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/82772535234866224635.
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碩士國立臺灣科技大學
電機工程系
87
The purpose of this thesis is to design a fuzzy PID speed controller based on fuzzy logic theory for a sensorless vector-controlled induction motor drive system. First, the control rule table of numerical value is constructed by using natural control laws. Then, the torque command is calculated according to the speed error and the change of speed error by using fuzzy inference rules. We also propose a speed estimator by the full order state observer based on adaptive control theory. The proposed scheme uses the state observer which can allocate poles arbitrarily. Therefore, it can be applied to the direct field-oriented control, even in a low speed range. Experiments are setup by a PC-based visual module to inverter to evaluate the effectness of the proposed method. The experimental results demonstrate that the fuzzy PID meets a high performance and robust control system. The design of fuzzy controller does not require accurate mathematical model of system, so it is easy to implement.
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Lo, Mei-wei, i 羅美薇. "Design of Low-Power Controllers for High-Performance Controller-Datapath Systems". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/20677875777297580448.
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碩士國立中山大學
資訊工程學系研究所
94
The state assignment is one of the most important problems in hardware implementation of controllers (finite state machines, FSMs). Traditional heuristics include simulated annealing (SA), greedy approach, and recursive Min-Cut partitioning. Since these methods can’t reduce both area and power, thus we propose a new approach which using integer linear programming (ILP) to solve the state assignment. The proposed of ILP approach can set the weight and reach best solution between less area and low power. The approach can find out the best state assignment for both low-area and low power consumption. In addition, we also use ILP to solve the output encoding of controller in order to reduce the power consumption of datapath. Finally, to verify the effectiveness of our proposed approach, we do some experiments on several MCNC FSM benchmarks and controller-datapath systems. The experimental results show that a significant power and area savings can be achieved.
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Lee, Meng Chang, i 李孟昌. "Robust Controller and Tracking Controller Design for Uncertain Systems". Thesis, 1995. http://ndltd.ncl.edu.tw/handle/42396732575712272927.
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碩士逢甲大學
化學工程研究所
83
During the past years, the design problem of the robust controller and tracking controller had important developed for uncertain systems. In this thesis, we present a systematic robust controller and tracking controller design methodology for uncertain process systems described by state space model. First,Based on a Lyapunov function and a Riccati equation, we propose a guaranteed exponential convergent rate robust controller for the case that the parametric uncertainties satisfy the so called matching condition. If there is not the case, i.e. the parametric uncertainties do not satisfy the matching condition, we present a method to detune the robust controller to preserve at least quadratic performance. On the other hand, the robust tracking controller is designed in the sense of feedforward control to track the desire model so that the tracking error is made arbitrary small, and the system is said to practically trackthe input. If there is not the case, i.e. the parametric uncertainties do not satisfy the matching condition, the tracking error cannot be made arbitrary small. Furthermore, we propose an observer-based robust controller for uncertain systems whose states are unmeasurable or unavailable. Finally we apply the proposed controller design strategies to the control of an uncertain gas absorber system.
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Shih, Ting-Kuei, i 史廷揆. "Traditional PID Controller-Based Neural Fuzzy PID Controller Design". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/93877397598408370250.
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碩士中華大學
機械工程學系碩士班
98
This thesis is based on the use of traditional PID controller, then directly extends the results to the fuzzy and Neural Network (NN) PID Controller. Depending on the availability of the system transfer function, traditional PID controller design method is divided into two categories, (1) If the system transfer function is known in advance: this method has three types as: 1. System identification method, 2. Bode diagram method, and 3. Root locus method. The other category is (2), if one has no prior system transfer function, then types methods can be applied: 1. Relay feedback method and, 2. Online adjustment method. The purpose of this thesis is: firstly, by applying these five methods, find the relevant design parameters according to Ziegler-Nichols algorithm to calculate the gain-values of PID controller. The next directly extends the results to the fuzzy and Neural Network (NN) PID Controller. This study is applied to two systems; the first is for a scanning probe control system design. The second is to the fuel cell coupled control system design. For the scanning probe control system design, the first step uses of MATLAB / SIMULINK for building system modeling. Second, look for PID parameters by using three methods (If the system transfer function is known in advance) such as: 1. System identification method, 2. Bode diagram, and 3. Root locus method. Calculate the related parameter values, and then one can obtain the gains of the PID controller according to Ziegler-Nichols algorithm. The next is to extend the results of PID controller directly into Fuzzy PID controller. In addition, the backlash hysteresis effect of the force actuator is also included for comparison. From the simulation results one can see that the performances of fuzzy PID controllers are better for the cases with backlash hysteresis effect, and the one obtained by the system identification method is the best. The second application is for a fuel cell coupled-type control system design. As it is difficult to calculate the transfer function of the coupled control system, so the PID controller is designed without using the system transfer function of the previous methods, while the relay feedback and online adjustment methods are applied. The performance of the PID Controller1 ( =0.6、 =0.7、 =0.175) obtained by the online adjustment method is very good for about 2.5 seconds to reach the steady state. On the other hand, the PID Controller2 ( =0.6、 =0.65、 =0.1625) obtained by the relay feedback method is with output larger overshoot and oscillation, and takes about 7 seconds to reach steady state. However, from the results obtained by the fuzzy controllers, we find that the system responses can quickly reach the steady-states without any over shoot, but there are small ripple effects at the steady-state. In addition, we also apply the membership functions of fuzzy controller to design the Neural Network (feed-forward NN) controller. From the simulation results we can see there are significant overshoots, but the systems reach the steady state quickly without any ripple effects at the steady-state. According to the results from the two application examples, we can see that the fuzzy controllers are better especially if there are backlash hysteresis and parameters variation effects.
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Huang, Chi-Wen, i 黃其文. "Suppression of Subsynchronous Resonance Using H∞ Controller of Thyristor-Controlled Series Capacitors". Thesis, 1997. http://ndltd.ncl.edu.tw/handle/64386567651387514804.
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碩士國立成功大學
電機工程學系
85
This thesis investigates the application of thyristor-controlled series capacitors (TCSC) and robust H∞ control theory on damping enhancement of subsynchronous torsional interactions of a power system containing series-capacitor compensation. The studied power system, i.e., the IEEE Second Benchmark Model, system-s, consists of two sets of nonidentical turbine-generators connected to an infinite bus through a common series-capacitor compensated line. Damping controllers employ shaft speed deviations of the studied generators as feedback signals to generate a damping signal in order to modulate the firing angle of TCSC's thyristors. Frequency-domain approach based on a linearized model and eigenvalue analysis is performed. Time-domain approach based on nonlinear model simulation under torque disturbances, a three-phase fault, and the variation of system operating point is also carried out. The proposed H∞ controller is also further reduced to a second order one for practical application by using order-reduction technique. The simulation results show that the designed H∞ controller can effectively suppress the subsynchronous resonance.
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Jair, Ruey-Ynan, i 翟瑞元. "DESIGN OF AN ADAPTIVE SPEED CONTROLLER FOR VECTOR-CONTROLLED INDUCTION MOTOR DRIVES". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/21054910688295177514.
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碩士中正理工學院
電機工程研究所
86
A systematic design method of PI controller for vector-controlled induction motor drives is investigated in this thesis. In order to deal with the parameter variation of the induction motor and load torque disturbance, a model reference adaptive controller which based on Lyapunov stability theorem is proposed to control the speed of induction motor. The results show that the speed control performance of the adaptive controller is better and more robust than the traditional PI controller. In hardware implementation the actual stator currents and rotor speed signals are used, and the control software is developed on the personal computer by Turbo C program language. The experimental results show good performance for model reference adaptive controller under no-load and loading conditions at various speeds.
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Nguyen, Truong-Giang, i 阮長江. "The Study of Optimal–Feedrate Controller for a Computerized Numerical Controlled Machine". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/81108872310929519489.
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博士大葉大學
機械與自動化工程學系
98
In this study, the main purpose is to propose an optimal-feedrate controller for a computerized numerical controlled (CNC) machine. The first is to provide a speed-controlled interpolation method based on optimal-feedrate algorithm. The real-time interpolation method was taken full its advantages, the chord error and the difference between the orientation of tangent vector of the curve at current point and previous point were repeatedly checked through the whole interpolation process. If either chord error exceeded the prescribed tolerance or sharp corner was detected, the feedrate in the proposed interpolation method was automatically adjusted in order to confine the chord error within the prescribed tolerance. A parametric curve, determined by the non-uniform rational B-spline (NURBS), was employed to test the feasibility and precision of the proposed interpolation method. The second is to propose a look-ahead linear jerk filter (LALJF) for a CNC machine. Proposed algorithm was constructed in Structured Text program for a Fuji electric’s open programmable logic controller (PLC). For the purpose of ensuring smooth and accurate motion of a tool with a linear jerk change during real-time machining process, the proposed filter was formed by combining a look-ahead algorithm and three modified moving average filters (3MMAF). The look-ahead algorithm performed one look-ahead step-changing speed of the speed curve. The speed command was recalculated and sent to controller of CNC machine based on step-changing speed profile, given maximal acceleration/deceleration, and given maximal jerk. The theoretical and computational aspects of such LALJF are presented together with experimental results from their implementation on a 3-axis CNC machine. A multiple-step-changing speed curve of a CNC machine and a speed curve of a high-speed measurement system were constructed in order to verify the feasibility and precision of the proposed method.
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Jain, Jitendra Kumar. "Stability Analysis and Robust Controller Design of Indirect Vector Controlled Induction Motor". Thesis, 2017. http://ethesis.nitrkl.ac.in/9376/1/2017_PhD_JKJain_512EE1010.pdf.
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The thesis considers stability analysis and controller design through different performance measures for indirect vector controlled induction motor (IVCIM).These problems are known to be complex due to nonlinearity, large order and multi-loop scenario. Some new approaches and results on IVCIM are proposed in this work.
IVCIM dynamics is well known for having different bifurcation behavior, viz., saddle-node, Hopf, Bogdanov–Takens and Zero–Hopf bifurcations due to rotor resistance variation. These bifurcations affect the control performance and may lead to stalling or permanent damage of motor. A numerical analysis of these bifurcations for proportional integral (PI) controlled IVCIM is made in this thesis using full-order induction motor model (stator dynamics is included). This analysis aids to determine the allowable bifurcation parameter variation range as well as suitable choice of speed-loop gains to avoid these. Some new observations on the bifurcation behavior are made. Simulation and experimental results are presented validating the bifurcation behaviors.
For improving dynamic performance in the presence of load torque and rotor resistance variation, a new method for designing PI gains is proposed for IVCIM. The inner-loop current PI controllers are tuned simultaneously along with the speed controller. This method is implemented using a static output feedback scheme in which iterative linear matrix inequality (ILMI) based𝐻∞control technique is employed. Such a design makes stator currents and speed response to be robust against rotor resistance and load variations. A comparison between proposed design and a conventional one is shown using simulation and experimental results that validate the superiority of the proposed approach.
Owing to multi-loop and nonlinear system behavior, IVCIM dynamics is known to have coupling in between the two inner-loop stator current components (flux and torque). Such coupling affects the dynamic torque output of the motor. Decoupling of the stator currents are important for smoother torque response of IVCIM. Conventionally, additional feedforward decoupler is used to take care of the coupling that requires exact knowledge of the motor parameters and additional circuitry or signal processing. A method is proposed to design the regulating PI gains while minimizing coupling without any requirement of additional decoupler. The variation of the coupling terms for change in load torque is considered as the performance measure. The same ILMI based𝐻∞control design approach is used to obtain the controller gains. A comparison between the conventional feedforward decoupling and proposed decoupling scheme is presented through simulation and experimental results that establish the effectiveness of the proposed method riding over its simplicity.
Finally, since the PI controller can yield limited performance, a dynamic controller is designed for the IVCIM drive system. In the design process, iron-loss dynamics are incorporated into induction motor model to fetch benefit through better performance. A sequential design method is used for the controller design in which, first, the inner-loop controllers are designed. The designed inner-loop controllers is then used for designing the outer speed-loop controller. The proposed design employs ILMI based𝐻∞control design for dynamic output feedback controller that makes stator currents and speed response to be robust against disturbances. A comparison among proposed dynamic controller design, PI controller and compensator design is shown using simulation and experimental results demonstrate enhanced performance of the proposed controller and suitability for industrial purpose.
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Obaiah, M. C. "Multiobjective output feedback controller compare with IMC-based PID controller". Thesis, 2014. http://ethesis.nitrkl.ac.in/6293/1/E-73.pdf.
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The present work aims at comparison between Internal Model Control (IMC) and Multiobjective Output Feedback Controller. The inter model control (IMC) based tuning principle is straightforward, simple to use, and easy to implement which is exceptionally appealing to professionals in the real practice. The most essential reality is IMC-PI/PID tuning guideline has one and only characterized tuning parameter, which is straightforwardly identified with the closed loop time constant. Internal Model Control selecting among the other conventional PID Controllers by considering values of the Integral of the squared value of the error (ISE) and Integral of the absolute value of the error (IAE). IMC is comparing with Direct Synthesis Method (DSM) this method is based on the desired closed loop characteristic equation. In Multiobjective the design objectives are H-infinity and Pole Placement Constraints. These design objectives are formulated in terms of the common lyapunov function. A complete Linear Matrix Inequality (LMI) of the output feedback synthesis with H-infinity control with pole placement is presented. By change of controller variables the output feedback control would be linearized due to the nonlinear terms include in the objectives constraints. The Linear Matrix Inequality (LMI) constraints of the design objectives i.e. H-infinity and Pole Placement Constraints are derived, and these LMI constraints are solving by using LMI Solvers. The comparison of the methods is illustrated by a realistic design example and the simulation results are presents.
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Lin, Hong-Ming, i 林弘閔. "Baking Controller Design". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/344g27.
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碩士龍華科技大學
電機工程系碩士班
105
Baking oven function in recent years more and more perfect, in accordance with the needs of consumers to design other functions, No need to opening the oven to do some other deal with batter in the process of baking , easy to use the user simply, easy operation.. In this paper, we design a temperature controller for baking, based on the Z-N tuning method (auto-tunning) in the relay stability shock obtained when the critical gain and oscillation cycle to calculate the PID control parameters, through this set of PID parameters to stabilize the temperature to achieve Bake the purpose of the controller. Compare the functionality of the oven on the market to design the controller interface, plus the existing switch control (sprinkler valves, steam valves, lighting, etc.) to design a user interface ,to achieve the use of convenience and practical.
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Ku, Chin-Yung, i 古金永. "CMAC Controller forManipulatorArm". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/18949775624802181387.
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碩士元智大學
電機工程學系
97
In this thesis, we describe the dynamic robot model, provides the necessary joints and the angle parameters. Based on the PD controller, a CMAC supplement controller is proposed to control the manipulator arm along the track trajectory on the horizontal plane. This controller is compared with a PD controller and a PD controller with backpropagation neural network, to illustrate the merits of stability and tracking performance for the proposed design method.
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Ribeiro, Simão Pedro Rocha. "Smart Hydraulics Controller". Master's thesis, 2014. https://repositorio-aberto.up.pt/handle/10216/101443.
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