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Dissertations / Theses on the topic 'Control Variable'

Author: Grafiati

Published: 8 September 2023

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1

Hughes, Christopher Scott. "Variable Sampling Rate Control Charts for Monitoring Process Variance." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/37643.

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Industrial processes are subject to changes that can adversely affect product quality. A change in the process that increases the variability of the output of the process causes the output to be less uniform and increases the probability that individual items will not meet specifications. Statistical control charts for monitoring process variance can be used to detect an increase in the variability of the output of a process so that the situation can be repaired and product uniformity restored. Control charts that increase the sampling rate when there is evidence the variance has

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2

Ginsberg, David W. "Variable structure control systems." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/18787.

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The primary aims of this thesis, is to provide a body of knowledge on variable structure system theory and to apply the developed design concepts to control practical systems. It introduces the concept of a structure. The main aim in designing variable structure controllers, is to synthesize a variable structure system from two or more single structure systems, in such a way that the ensuing system out-performs its component structures. When a sliding mode is defined, the ensuing closed loop behaviour of the system is invariant to plant parameter changes and external disturbances. A variable s

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3

Amin, Raid Widad. "Variable sampling interval control charts." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/82617.

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Process control charts are widely used to display sample data from a process for purposes of determining whether a process is in control, for bringing an out-of-control process into control, and for monitoring a process to make sure that it stays in control. The usual practice in maintaining a control chart is to take samples from the process at fixed length sampling intervals. This research investigates the modification of the standard practice where the sampling interval or time between samples is not fixed but can vary depending on what is observed from the data. Variable sampling interval

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4

Wang, Longke. "Adaptive control of variable displacement pumps." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43654.

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Fluid power technology has been widely used in industrial practice; however, its energy efficiency became a big concern in the recent years. Much progress has been made to improve fluid power energy efficiency from many aspects. Among these approaches, using a valve-less system to replace a traditional valve-controlled system showed eminent energy reduction. This thesis studies the valve-less solution-pump displacement controlled actuators- from the view of controls background. Singular perturbations have been applied to the fluid power to account for fluid stiffness; and a novel hydraulic c

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5

Reay, Donald S. "Variable structure control of industrial robots." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257514.

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6

Sethuraman, Shanthi. "Variable sampling interval control strategies for a process control problem." Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/40313.

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7

Woodham, Catherine Anne. "Eigenvalue placement for variable structure control systems." Thesis, University of Sheffield, 1992. http://etheses.whiterose.ac.uk/14793/.

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Variable Structure Control is a well-known solution to the problem of deterministic control of uncertain systems, since it is invariant to a class of parameter variations. A central feature of vsc is that of sliding motion, which occurs when the system state repeatedly crosses certain subspaces in the state space. These subspaces are known as sliding hyperplanes, and it is the design of these hyperplanes which is considered in this thesis. A popular method of hyperplane design is to specify eigenvalues in the left-hand half-plane for the reduced order equivalent system, and to design the contr

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8

Yallapragada, Subbarao. "Variable structure control and output feedback systems." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/13303.

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9

Ingvast, Johan. "Quadruped robot control and variable leg transmissions." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-600.

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10

Licari, John. "Control of a variable speed wind turbine." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/46516/.

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Stop signal task of response inhibition, I find that response inhibition (stopping) is slowed in the presence of angry facial expressions, and such slowing is greater in individuals high in trait neuroticism. Further, as predicted, the influence of neuroticism is moderated by individual differences in emotion regulation, such that good emotion regulation ‘buffers’ the impact of neuroticism. The implications of these findings for current cognitive models of threat-processing are discussed.

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11

Eriksson, Ludvig, and Ilango Lourdudoss. "SKUGGA: Sunglasses with Variable Electronic Tint Control." Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198153.

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Tillsammans med den svenska design och ingenjörsbyrån, Top Notch Design & Engineering, har ett par solglasögon, under namnet SKUGGA, med elektriskt justerbar toning tagits fram. Ett av målen var att förverkliga en teknologiskt avancerad produkt med en icke-teknisk design. Den slutgiltiga produkten bestod av flera tekniska komponenter och funktioner, som Bluetooth, ljussensor, UV-mätare och Induktionsladdning (Trådlös laddning). Den justerbara toningen är möjligt tack vare LC Tecs Liquid Crystal (LC) filter. Med en elektrisk spänning kan ljusinsläppet (transmittansen) justeras och nivån bes

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12

Mostafa, Osama A. "Variable structure control system maneuvering of spacecraft /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487267546980772.

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13

Maggiore, Manfredi. "Output feedback control : a state-variable approach /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488203552780374.

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14

Ramtharan, Gnanasambandapillai. "Control of variable speed wind turbine generators." Thesis, University of Manchester, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556174.

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15

Shekhar, Rohan Chandra. "Variable horizon model predictive control : robustness and optimality." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/244210.

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Variable Horizon Model Predictive Control (VH-MPC) is a form of predictive control that includes the horizon length as a decision variable in the constrained optimisation problem solved at each iteration. It has been recently applied to completion problems, where the system state is to be steered to a closed set in finite time. The behaviour of the system once completion has occurred is not considered part of the control problem. This thesis is concerned with three aspects of robustness and optimality in VH-MPC completion problems. In particular, the thesis investigates robustness to well defi

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16

Yoon, Hyungjoo. "Spacecraft Attitude and Power Control Using Variable Speed Control Moment Gyros." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4850.

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A Variable Speed Control Moment Gyro (VSCMG) is a recently introduced actuator for spacecraft attitude control. As its name implies, a VSCMG is essentially a single-gimbal control moment gyro (CMG) with a flywheel allowed to have variable spin speed. Thanks to its extra degrees of freedom, a VSCMGs cluster can be used to achieve additional objectives, such as power tracking and/or singularity avoidance, as well as attitude control. In this thesis, control laws for an integrated power/attitude control system (IPACS) for a satellite using VSCMGs are introduced. The power tracking objective is a

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17

Dridi, Hocine. "Microprocessor control of a DC variable speed drive." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319962.

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18

Milman, Ruth. "Adaptive backstepping control of the variable reluctance motor." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ28848.pdf.

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19

Whittington, William Grant. "Cooperative control of systems with variable network topologies." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49107.

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Automation has become increasingly prevalent in all forms of society. Activities that are too difficult for a human or to dangerous can be done by machines which do not share those downsides. In addition, tasks can be scheduled more precisely and accurately. Increases in the autonomy have allowed for a new level of tasks which are completed by teams of automated agents rather than a single one, called cooperative control. This has many benefits; but comes at the cost of increased complexity and coordination. The main thrust of research in this field is problem based, considering communica

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20

Larbes, Cherif. "Boost modulation : control of AC variable speed drives." Thesis, Lancaster University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304281.

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21

Biswas, Md Israfil. "Internet congestion control for variable-rate TCP traffic." Thesis, University of Aberdeen, 2011. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=182264.

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The Transmission Control Protocol (TCP) has been designed for reliable data transport over the Internet. The performance of TCP is strongly influenced by its congestion control algorithms that limit the amount of traffic a sender can transmit based on end-to-end available capacity estimations. These algorithms proved successful in environments where applications rate requirements can be easily anticipated, as is the case for traditional bulk data transfer or interactive applications. However, an important new class of Internet applications has emerged that exhibit significant variations of tra

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22

Lloyd, Simon H. "Variable speed control of a small wind turbine." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/14376.

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An electronic controller has been developed for a wind turbine which uses a passive pitching mechanism and a permanent magnet generator. The turbine rotor is a 3 bladed, down wind horizontal axis design with a diameter of 3.4m. The machine, manufactured by Proven Engineering Ltd., produces 2.2kW at a wind speed of 12m/ s and a rotor speed of 30Orpm. Passive regulation is achieved through a variation of blade pitch controlled by balancing the aerodynamic, centrifugal and spring forces acting on each blade. A production machine has been instrumented and laboratory and field test data collected;

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23

Fleder, Michael (Michael S. ). "Affordance-based control of a variable-autonomy telerobot." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/85221.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2012.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis. "September 2012."<br>Includes bibliographical references (pages 37-38).<br>Most robot platforms operate in one of two modes: full autonomy, usually in the lab; or low-level teleoperation, usually in the field. Full autonomy is currently realizable only in narrow domains

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24

Dadashnialehi, Ehsan. "Modeling And Control of Variable Speed Wind Turbines." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1356372607.

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25

Kilander, Johanna, and Madeleine Frisell. "Variable expiration control for an intensive care ventilator." Thesis, Linköpings universitet, Institutionen för medicinsk teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157761.

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Critical care patients are often connected to ventilators, to support or replace their breathing. The ventilators deliver a mixture of gas to the patient by applying a specific volume or pressure, and then the patient exhales passively. This thesis is based of the hypothesis that a slower reduction of the expiration pressure could benefit intensive care patients connected to a ventilator. To enable research within the area, a device which can control the expiration is needed. In this thesis project, an expiration valve was controlled to create different pressure patterns during expiration. To

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26

Zhu, Chaoying. "Induction motor speed sensing and control." Thesis, University of Sussex, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358985.

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27

Goodfellow, David. "Variable speed operation of wind turbines." Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/7822.

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This work describes a control system in which a cycloconverter is connected between the secondary windings of a three phase induction machine and the a. c. mains supply to give variable speed sub- and super –synchronously. In order to control the system smoothly in an asynchronous mode a secondary emf signal generator has been designed, which enables the cycloconverter to operate in synchronism with the emf induced in the secondary windings of the machine. A computer programme has been written which calculates the required firing angles for the cycloconverter to produce secondary current in ph

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28

Myslicki, Stefan Leopold 1953. "A VARIABLE SAMPLING FREQUENCY CUMULATIVE SUM CONTROL CHART SCHEME." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276503.

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This study uses Monte Carlo simulation to examine the performance of a variable frequency sampling cumulative sum control chart scheme for controlling the mean of a normal process. The study compares the performance of the method with that of a standard fixed interval sampling cumulative sum control chart scheme. The results indicate that the variable frequency sampling cumulative sum control chart scheme is superior to the standard cumulative sum control chart scheme in detecting a small to moderate shift in the process mean.

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29

Kypuros, Javier Angel. "Variable structure model synthesis for switched systems /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008373.

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30

Lewin, Paul Leonard. "Microprocessor control of a switched reluctance motor." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262359.

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31

Maugham, Robin. "Dilution torque control of a gasoline engine." Thesis, University of Bath, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268735.

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32

McKenna, Paul. "Delta operator : modelling, forecasting and control." Thesis, Lancaster University, 1997. http://eprints.lancs.ac.uk/65542/.

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Interest in the delta operator as a tool in the development of robust approaches to modelling and control has been revived in the last decade, principally following the work of Goodwin (1985). The use of this discrete differential operator provides improved numerical properties particularly when modelling or implementing control at high sampling frequencies or under finite wordlength restraints. The delta operator also provides for the alliance of continuous time designs and discrete time application, linking traditional control theory with modern implementation through digital computing. In t

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33

Cho, Gyo-Young. "Multivariate control charts for the mean vector and variance-covariance matrix with variable sampling intervals." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/37242.

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34

Flores-Cerrillo, Jesus MacGregor John F. "Quality control for batch processes using multivariate latent variable methods /." *McMaster only, 2003.

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35

Guo, Wei Horn Joseph F. "Flight control design for rotorcraft with variable rotor speed." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-4647/index.html.

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36

Bergström, Andreas. "Torque Modeling and Control of a Variable Compression Engine." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1821.

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<p>The SAAB variable compression engine is a new engine concept that enables the fuel consumption to be radically cut by varying the compression ratio. A challenge with this new engine concept is that the compression ratio has a direct influence on the output torque, which means that a change in compression ratio also leads to a change in the torque. A torque change may be felt as a jerk in the movement of the car, and this is an undesirable effect since the driver has no control over the compression ratio. </p><p>The aim of this master's thesis work is to develop a torque control strategy for

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37

Chen, Wei-Jen, and 陳威仁. "Multi-Variable Control of Variable-Frequency Air Conditioner." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/50615414725387915463.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>104<br>The main purpose of the present research is to develop a variable-frequency air conditioner system. By modifying the frequency of the compressor and the opening of the electronic expansion valve, we can precisely control room temperature and superheat temperature. The multi-variable control system is simplified to two individual single variable control systems, while the interaction is treated as the disturbance process of the control system. A prototype of variable-frequency air conditioner system was built and tested. The experiment results show that the ro

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38

Huang, Tung-Chuan, and 黃東川. "Control of Variable Reluctance Motors." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/18544094856535785268.

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碩士<br>國立交通大學<br>機械工程研究所<br>86<br>The purpose of this thesis is to design a high performace velocity controller for vaiable reluctance motors (VRM) based on an adaptive feedback linearization method. The nonlinear adaptive controller developed in this thesis contains two parts, one part compensates all the non-linearities between inputs and putputs, the other part contains a linear controller for motion tracking. With this controller, the asymptotic convergence of both the parameter estimation errors and command tracking errors are guaranteed. Furthermore, this adaptive controller is combined w

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Huang, Chin-Ching, and 黃智清. "Control of Hydrostatic Variable Transmission." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/854pnb.

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碩士<br>國立虎尾科技大學<br>機械與機電工程研究所<br>98<br>In this research, a new hydrostatic-transmission with shift control scheme is developed. Coupled with a 2-DOF planetary gear set, a hydraulic package of a reversible variable-displacement hydraulic pump/motor and accumulator is used to replace the conventional continuously variable transmission (CVT) to optimize energy economy. With this hydrostatic system, nearly all of the energy typically lost during vehicle braking is captured and used to propel the vehicle the next time it needs to accelerate. Compare with conventional CVT system, the benefits of hydr

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40

Liu, Hung-Hsi, and 劉洪禧. "FPGA implements variable gains control of the variable gain amplifier." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/01974566430523855947.

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碩士<br>中原大學<br>電子工程研究所<br>97<br>Field Programmable Gate Array (FPGA) can be used to implement complex logic function and provide rapid field re-programmable ability in a single chip design application. This thesis describes the use of hardware design language Verilog and the implementation of a variable gain controller in a Variable Gain Amplifier. A top-down methodology is applied in this design to make the design clearer and easier for maintenance. A look up table (LUT) mechanism is applied to realize faster computing and simplify the design complexity. The design is simulated by Modelsim and

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41

Jon, Yon-Huei, and 鍾勇輝. "Variable Structure Control and Fuzzy Control Applied to Flight Control Systems." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/09484883841764827724.

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碩士<br>國立交通大學<br>控制工程系<br>82<br>The purpose of the thesis is to design flight controller to make aircraft to fulfill the following maneuvers:level flight, climbing ,level turn and level acceleration. The flight controller is designed with variable structure control law and fuzzy control law for a practical flight control system. For the attitude and altitude hold control system,variable structure controller is used to help the aircraft to reject the matching type uncertainty . For the veloci

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42

"Multi-variable control techniques for greenhouses." Thesis, 2012. http://hdl.handle.net/10210/5421.

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M.Ing.<br>This research project is dedicated to the automation of environmental control within greenhouses. To create an optimal climate in the greenhouse, the main environmental parameters that need to be controlled are temperature, humidity and light intensity. As a result of process dead times and the extreme interdependence of these parameters, the control problem can be classified as non-linear and multi-variable. In the past, most greenhouse environmental control systems depended on the decision making of an experienced human operator. This often gave rise to trial and error, especially

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Shy, Kuen-Yih, and 施昆毅. "Multi-variable Discrete Sliding Mode Control." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/14276621274076315197.

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碩士<br>淡江大學<br>機械工程學系<br>90<br>A Sliding Model Control (SMC) is proposed for the temperature control of the thermal barrel in plastic molding processes. Firstly, derive a linear approximate model for the thermal barrel and treat the nonlinear term as an uncertainty or noise. Usually this uncertainty is a matched noise corresponding to the input. Since the Sliding Mode Control is robust to a matched noise, it is appropriate to design a digital sliding mode controller for a nonlinear system. Secondly, time delay of heat transferred in the thermal barrel results in oscillation at the output temper

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44

溫為閔. "Construction of Control Chart for Variable." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/55607122851723028886.

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碩士<br>明志技術學院<br>工程管理研究所<br>92<br>Statistical process control（SPC） is the method that monitor process quality characteristic. Through control charts, one can detect whether the present process malfunction. However, as one use it, one need choose different control charts in order to match different quality characteristic. But nowadays, any control chart can''t effectively monitor quality characteristic under variable circumstances. According to the aforementioned, that a quality engineer need choose different control charts under different processes will bring annoyance in using

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Chau, Jan, and 詹超. "Piezomechanics Using Intelligent Variable Structure Control." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/51252293446675360235.

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碩士<br>大同工學院<br>機械工程研究所<br>86<br>The so-called piezomechanics contains three parts: piezoelectric translator, carriage mechanism and control system. It is well-known that a piezoelectric translator consists of the following advantages: (i) unlimited resolution, (ii) no moving parts, (iii) high efficiency, (iv) large forces, and (v) fast response. However, three drawbacks of piezomechanics: (i) it should only be load axially, (ii) it contains hysteresis feature, and (iii) the expansion is dependent on temperature, must be tackled. The first drawback is solved by the carriage mechanism design. Th

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Huang, Chiue-Yan, and 黃雀燕. "Variable Control Charts with Fuzzy Data." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/69175868493387419101.

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碩士<br>國立高雄應用科技大學<br>工業工程與管理系<br>99<br>Traditionally, variable control charts are constructed based on precise data collected from well-defined quality characteristics of manufacturing products. However, in the real world there are many occasions the stated quality characteristic of products such as surface roughness of optical lens or light transmittance of touch screens contains somewhat degree of imprecise information so that their readings inevitably gather as fuzzy numbers (data). In this situation, the traditional method for constructing the variable control charts exists a limitation of

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47

Hwa, Lan Chii, and 藍啟華. "The Position Control of Electrohydraulic Servomechanism via Variable Structure Control." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/62170237469227713471.

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碩士<br>大同工學院<br>機械工程研究所<br>81<br>There are many distinct advantages of a hydraulic control system, such as a higher speed of response with fast motions, a higher torque stiffness, and a higher output power per unit weight. The hydraulic control system becomes the most common form of precise manipulation system. However, some nonlinear phenomena, such as the relationship between input current and output flow, the fluid compressibility, and the deadband due to internal leakage and hysteresis,

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48

Costa, Válter de Sousa. "LLC resonant charger with variable inductor control." Master's thesis, 2016. http://hdl.handle.net/10400.26/18421.

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The present work pretends to study the operation and behavior of the LLC resonant converter topology considering a battery charging application, using the traditional switching frequency control and a new control variable, the variable inductance, provided by a current controlled device, the Variable Inductor (VI). During this work, a brief state of the art regarding general types of power converters and resonant power converters is presented. The LLC resonant converter topology and its advantages and disadvantages are described. The VI principle of operation and structure is presented

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黃信仁. "Synthetic Control Charts with Variable Sampling Intervals." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/01371998781853508264.

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博士<br>國立清華大學<br>工業工程與工程管理學系<br>93<br>Statistical process control (SPC) techniques have been greatly implemented in industries for improving product quality and saving production costs. As a primary tool among these techniques, control charts are widely used to detect the occurrence of assignable causes. Recently proposed synthetic control charts perform well for monitoring process mean, fraction nonconforming and mean of interarrival times. For monitoring other types of process parameters conveniently, this study proposes a general model of synthetic control chart with regard to non-specified

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Lee, Rong-Chyang, and 李榮全. "Specific designs in variable structure control systems." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/61197268993633047466.

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