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Дисертації з теми "Pneumatic control Computer simulation"

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Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 29 січня 2023

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1

Mehmood, Adeel. "Modeling, simulation and robust control of an electro-pneumatic actuator for a variable geometry turbocharger." Phd thesis, Université de Technologie de Belfort-Montbeliard, 2012. http://tel.archives-ouvertes.fr/tel-00827445.

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Анотація:
The choice of technology for automotive actuators is driven by the need of high power to size ratio. In general, electro-pneumatic actuators are preferred for application around the engine as they are compact, powerful and require simple controlling devices. Specially, Variable Geometry Turbochargers (VGTs) are almost always controlled with electro-pneumatic actuators. This is a challenging application because the VGT is an important part of the engine air path and the latter is responsible for intake and exhaust air quality and exhaust emissions control. With government regulations on vehicle pollutant emissions getting stringent by the year, VGT control requirements have also increased. These regulations and requirements can only be fulfilled with precise dynamic control of the VGT through its actuator. The demands on actuator control include robustness against uncertainty in operating conditions, fast and smooth positioning without vibration, limited number of measurements. Added constraints such as nonlinear dynamic behavior of the actuator, friction and varying aerodynamic forces in the VGT render classical control methods ineffective. These are the main problems that form the core of this thesis.In this work, we have addressed the above mentioned problems, using model based control complemented with robust control methods to overcome operational uncertainties and parametric variations. In the first step, a detailed physical model of an electro-pneumatic actuator has been developed; taking into account the nonlinear characteristics originating from air compressibility and friction. Means to compensate for aerodynamic force have been studied and implemented in the next step. These include model parametric adaptation and one dimensional CFD (Computational Fluid Dynamics) modeling. The complete model has been experimentally validated and a sensitivity analysis has been conducted to identify the parameters which have the greatest impact upon the actuator's behavior. The detailed simulation model has then been simplified to make it suitable for control purposes while keeping its essential behavioral characteristics (i.e. transients and dynamics). Next, robust controllers have been developed around the model for the control objective of accurate actuator positioning in presence of operational uncertainty. An important constraint in commercial actuators is that they provide output feedback only, as they are only equipped with low-cost position sensors. This hurdle has been overcome by introducing observers in the control loop, which estimate other system states from the output feedback. The estimation and control algorithms have been validated in simulation and experimentally on diesel engine test benches.
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2

Wang, Zheng. "The design and implementation of a computer-controlled pneumatic device to replace the deadweight in standard exercise equipment." Thesis, Cape Peninsula University of Technology, 2007. http://hdl.handle.net/20.500.11838/1384.

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Анотація:
Thesis (MTech (Information Technology))--Cape Peninsula University of Technology, 2007
The increasingly sedentary lifestyle of the past 30 years has contributed to declining health. Consequently, exercise is vital for good health maintenance. The global Health and Fitness Industry repeatedly indicates the need for optimally managed exercise with accurate information feedback. Compared to other industries, the fitness industry is lagging behind in incorporating Information Technology into its operations. On the other hand, the most current exercise equipment impose fixed-trajectory exercise on users with the dominance of static equipment designs. These exercise equipment are normally deadweight-based equipment. In deadweight-based exercise equipment, the weights generally can be changed only when the equipment is inactive. Therefore, a more novel exercise environment is required for current exercisers in the fitness industry. This thesis explores to develop a computer-controlled pneumatic dynamic resistance exercise equipment with onboard data management. This new technology optimises exercise effectiveness for users. Exercisers will have advanced diagnostic capacity, and will capture user data which can be manipulated into meaningful information for use by Health and Fitness Industry stakeholders. This thesis will explore all the key concepts about computer-controlled equipment. The key concepts to be investigated will include FX (force-displacement) control technology, pneumatic system control, fail-safe mechanics, and Graphical User Interface design. The primary aim of the project is to replicate and enhance the functionality, performance, and sensation of deadweight-based equipment. A further aim of the project is to investigate the feasibility of designing a compact retrofit-able pneumatic unit to replace the deadweights of existing standard exercise equipment. The computer control will be implemented on a "National Instruments PXI" computer featuring Data Acquisition and Control (DAQAC) capacity, and the software will be implemented using "LabVIEW 7.0', which is a graphic object-oriented computer language developed to facilitate hardware I software communications.
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3

Solomon, Luiza. "Learning and flow control in optimistic simulation." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29475.

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Анотація:
This thesis has two main contributions. The first contribution is the development of a modular, easy-to-use Time Warp simulation engine targeted towards distributed-memory environments. The second contribution is the analysis and experimental verification of the performance of the flow control algorithm proposed by Choe in a distributed-memory environment.
The Time Warp simulation engine TWSIM provides our laboratory with a research medium for Time Warp simulations in a distributed-memory environment such as a network of workstations. The modular design of TWSIM allows for easy integration of any new simulation application and for fast testing of optimizations and improvements to the Time Warp mechanism. Its compact size and object-oriented implementation using the C++ programming language result in a short learning curve for future users and developers.
The flow control algorithm proposed by Choe was implemented and analyzed with the aid of the TWSIM simulation engine. The algorithm makes use of stochastic learning automata to balance simulations loads by continuously regulating the flow of events between processors during the course of the simulation. Three different load metrics are considered: memory usage, virtual time, and a space-time product of the first two metrics. The algorithm was tested with two different simulation applications: a queuing network simulation and a Personal Communication Services (PCS) simulation. Results show that the flow control algorithm reduces the memory usage; the number of rollbacks and the number of antievents at the expense of the simulation time. As well, it becomes apparent that the behaviour of the flow control algorithm is not a consequence of learning.
Finally, we discuss a number of approaches to learning and flow control using the outlines of the flow control algorithm, and we consider the extent of the performance improvement to be expected from memory-based schemes for limiting Time Warp optimism in a distributed-memory environment.
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4

Zhang, Yang. "Study of central control actions in computer simulation." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/6456.

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Анотація:
The Canadian government identified the reliability of public urban transit systems and the improvement of customer services as a priority. Therefore, in 1997, Transport Canada and the Regional Municipality of Ottawa-Carleton have set up a project called the "Bus Priority System Project" to enhance the capabilities of the existing OPSSIM simulation model in order to satisfy these requirements. The enhancement of the simulation model would allow for the training of controllers, as well as for the evaluation of new control strategies. This thesis describes a part of the project. It works on the design, research, investigation and implementation of a Central Control Action Module, and on the design and implementation of a user-friendly Run Time Bus Progress Screen. A brief user guide describing how to use these new features is also included in the thesis for the benefit of potential users. In the conclusion, overviews for future research are identified.
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5

Chen, Lule. "Study of bus control strategies by computer simulation." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/6654.

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Анотація:
In this thesis, a simulation model used to simulate the running of buses on a single route, OC Transpo route 95, is studied. The model is implemented on a platform different from its original design at the University of Ottawa, and validation experiments are performed. For the most part, the model seems valid, although some additional calibration is recommended. New headway-based bus control strategies are presented and compared with other known control strategies. The statistical analysis and comparisons of those control strategies are based on the testing results obtained from the simulation model. The new headway control policies (called "Message Board" and "hybrid" policies) are shown to provide better service reliability in terms of less variable headway for the high-frequency route 95. Finally, a prototype of a knowledge-based system for real-time bus control purposes is developed and tested on the simulation model. The prototype is shown to be an interesting alternative for real-time bus control: it can effectively interface with the simulation model and perform real-time service control. This prototype will be a building block in the development of a more complete knowledge-based system capable of implementing more complex real-time service control policies in the hope of providing assistance to human controllers.
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6

Cruz, Eva Brunilda. "Simulation of computer control strategies for column flotation." Thesis, Virginia Tech, 1994. http://hdl.handle.net/10919/46104.

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Анотація:
System identification techniques were applied to obtain mathematical expressions relating column flotation operating parameters. The empirical data were derived by making individual step changes in tailings rate, wash water rate, feed rate, frother addition and air rates, while measuring the pulp level and air holdup responses. The dynamic behavior of the flotation column is also analyzed for the conditions at which the tests were perfonned. After converting these mathematical equations into continuous and discrete transfer function matrices, several control algorithms were simulated on this column flotation empirical representation. Suggestions are provided to deal with the complexities of the process when designing a control scheme.
Master of Science
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7

Guerriero, Brian A. "Haptic control and operator-guided gait coordination of a pneumatic hexapedal rescue robot." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24626.

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8

Chen, Yang. "Modeling, Control, and Design Study of Balanced Pneumatic Suspension for Improved Roll Stability in Heavy Trucks." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/95168.

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Анотація:
This research investigates a novel arrangement to pneumatic suspensions that are commonly used in heavy trucks, toward providing a dynamically balanced system that resists body roll and provides added roll stability to the vehicle. The new suspension, referred to as "balanced suspension," is implemented by retrofitting a conventional pneumatic suspension with two leveling valves and a symmetric plumbing arrangement to provide a balanced airflow and air pressure in the airsprings. This new design contributes to a balanced force distribution among the axles, which enables the suspension to maintain the body in a leveled position both statically and dynamically. This is in contrast to conventional heavy truck pneumatic suspensions that are mainly adjusted quasi-statically to level the body in response to load variations. The main objectives of the research are to discover and analyze the effects of various pneumatic components on the suspension dynamic response and numerically study the benefits of the pneumatically balanced suspension system. A pneumatic suspension model is established to capture the details of airsprings, leveling valves, check valves, pipes, and air tank based on the laws of fluid mechanics and thermodynamics. Experiments are designed and conducted to help determine and verify the modeling parameters and components. Co-simulation technique is applied to establish a multi-domain model that couples highly non-linear fluid dynamics of the pneumatic suspension with complex multi-body dynamics of an articulated vehicle. The model is used to extensively study effects of pneumatic balanced control of the suspensions on the tractor and trailer combination dynamics. The simulations indicate that the dual leveling valve arrangement of the balanced suspension provides better adjustments to the body roll by charging the airsprings on the jounce side, while purging air from the rebound side. Such an adjustment allows maintaining a larger difference in suspension force from side to side, which resists the vehicle sway and levels the truck body during cornering. Additionally, the balanced suspension better equalizes the front and rear drive axle air pressures, for a better dynamic load sharing and pitch control. It is evident from the simulation results that the balanced suspension increases roll stiffness without affecting vertical stiffness, and thereby it can serve as an anti-roll bar that results in a more stable body roll during steering maneuvers. Moreover, the Failure Mode and Effects Analysis (FMEA) study suggests that when one side of the balanced suspension fails, the other side acts to compensate for the failure. On the other hand, if the trailer is also equipped with dual leveling valves, such an arrangement will bring an additional stabilizing effect to the vehicle in case of the tractor suspension failure. The overall research results presented show that significant improvements on vehicle roll dynamics and suspension dynamic responsiveness can be achieved from the balanced suspension system.
PHD
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9

Vincent, Robert Durham. "Detection, simulation and control in models of epilepsy." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18684.

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Анотація:
We investigate the application of machine learning methods for the detection and control of seizure-like behavior in in vitro models of epilepsy. This research will form the basis for a new class of adaptive neurostimulation devices for the treatment of drug-resistant cases of epilepsy in humans. There are many technical obstacles to creating an adaptive control algorithm for these devices. At present, science has an incomplete understanding of the mechanisms and dynamics underlying both epilepsy and its treatments. This is reflected both in the long-standing problem of the detection or prediction of seizures and in the lack of clear criteria for optimizing an adaptive control algorithm. As in many medical problems, clinical data is sparse, expensive, and highly variable. We address the detection of epileptic states using boosted ensemble methods with a set of simple frequency spectrum features derived from electrophysiological recordings. While typical boosting methods are not designed for use with time series data, we present a recurrent boosting method that improves classification accuracy in our application domain. We also present an implementation of a biologically plausible model of epileptic neural tissue using a network of integrate and fire neurons with partially stochastic inputs and two time scales of refractory behavior. Finally, we train a reinforcement learning agent to control the dynamics of this network, reducing the occurrence of seizure-like events. This agent is intended to be a component of a closed-loop electrical stimulation device with a set of sensors and an adaptive stimulation strategy.
Nous étudions l'application des méthodes d'apprentissage automatique pour la détection et le contrôle d'activité semblable à une crise convulsive dans les modèles d'épilepsie in vitro. Cette recherche formera la base d'une nouvelle classe de dispositifs de neurostimulation auto-adaptatifs pour le traitement des patients qui ne répondent pas aux drogues antiépileptiques. Il y a beaucoup d'obstacles techniques pour créer un algorithme adaptatif pour ces dispositifs. Actuellement, la science n'a pas encore expliqué entièrement les mécanismes définissant l'épilepsie et ses traitements. Ceci est important à deux niveaux: Pour le problème de la détection ou de la prévision des crises, et pour établir des critères clairs pour optimiser un algorithme de contrôle adaptatif. Comme beaucoup de problèmes médicaux, les données cliniques sont rares, chères, et fortement variables. Nous adressons la détection des états épileptiques en utilisant les méthodes “boosting” avec un groupe de traits simples de spectre de fréquences dérivés des enregistrements électrophysiologiques. Tandis que les méthodes boosting typiques n'ont pas été conçues pour utiliser l'information disponible avec des données de séries chronologiques, nous présentons une méthode boosting récurrente qui améliore le taux de classification dans notre domaine d'application. Nous présentons également une exécution d'un modèle biologiquement plausible d'un système neural épileptique employant un réseau de neurones intègre-et tire ayant les signals d'entrées partiellement stochastiques et ayant deux échelles de temps de comportement réfractaire. En conclusion, nous formons un agent d'apprentissage par renforcement pour réduire l'occurrence d'activité semblable à une crise. Cet agent est prévu pour être une composante d'un dispositif en boucle fermée de stimulation électrique ayant un ensemble de capteurs et un algorithme adaptatif.
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10

Malchano, Matthew David 1980. "Biologically-plausible six-legged running : control and simulation." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29695.

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Анотація:
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
Includes bibliographical references (p. 63-66).
This thesis presents a controller which produces a stable, dynamic 1.4 meter per second run in a simulated twelve degree of freedom six-legged robot. The algorithm is relatively simple; it consists of only a few hand-tuned feedback loops and is defined by a total of 13 parameters. The control utilizes no vestibular-type inputs to actively control orientation. Evidence from perturbation, robustness, motion analysis, and parameter sensitivity tests indicate a high degree of stability in the simulated gait. The control approach generates a run with an aerial phase, utilizes force information to signal aerial phase leg retraction, has a forward running velocity determined by a single parameter, and couples stance and swing legs using angular momentum information. Both the hypotheses behind the control and the resulting gait are argued to be plausible models of biological locomotion.
by Matthew David Malchano.
M.Eng.
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11

Xiong, Xiao-Jin. "Modeling, control and computer simulation of a rotating Timoshenko beam." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0018/NQ44632.pdf.

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12

Xiong, Xiao-Jin. "Modeling, control and computer simulation of a rotating Timoshenko beam." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35652.

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Анотація:
In this work, we develop a mathematical model for a rotating Timoshenko beam, and then show its well-posedness. Further, we prove the exact controllability of its linearized model under different sets of controllers. Finally, we work out a computer simulation system for linear as well as nonlinear control problems.
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13

Girard, Michael. "The computer animation of legged animals : simulation, design and control /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487598748016958.

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14

Chayopitak, Nattapon. "Network-oriented simulation of variable reluctance motor with PWM control." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/15457.

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15

Brogan, David C. "Simulation levels of detail for control and animation." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/8142.

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16

Vesanterä, Pentti Juhani 1955. "Qualitative simulation: A tool for global decision making." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/291407.

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Анотація:
As a decision making aid for the human operator of a highly automated, complex system, qualitative modeling is presented as a tool to mimic the human global assessment process by learning from the system behavior. Such qualitative model is applied to reason about the behavior of a quantitatively simulated aircraft model, to determine on-line when a malfunction occurs in the quantitative model, to hypothesize about the nature of this malfunction, and to suggest a global strategy that would allow to operate (control) the quantitative aircraft under the modified flying conditions. Such an algorithm could be utilized as an addition to a conventional autopilot which would allow it to remain operational after a malfunction has taken place.
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17

Harischandra, Nalin. "Computer Simulation of the Neural Control of Locomotion in the Cat." Licentiate thesis, Stockholm : Numerisk analys och datalogi, Numerical Analysis and Computer Science, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4692.

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18

Asghar, Muhammad Nadeem. "Computer simulation of salinity control by means of an evaporative sink." Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318173.

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19

Molenaar, Robert. "Design and implementation of biosystem control and tools for biosystem simulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0017/NQ44519.pdf.

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20

Luke, Neville. "Space-time modelling and simulation of multipass processes within a modern computer environment." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301812.

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21

Ebrahimi, S. Morteza K. "Dynamic modelling and simulation of a CNC milling machine." Thesis, Cardiff University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287909.

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22

Von, Raubenheimer Albert Ludwich. "Strategic supply chain management using simulation." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-12012005-092956/.

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23

Ericsson, Niclas. "Improving Development of Communication Software in Industrial Control Systems using Simulation." Licentiate thesis, Mälardalens högskola, Inbyggda system, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-37212.

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Анотація:
In the industrial domain customers expect a product longevity of 10-20 years, with high reliability and availability. Since industrial distributed control systems often are safety critical, aspects such as determinism, low latency and jitter are crucial. More and more industrial systems are becoming connected to the Internet, since end customers are requiring e.g. business intelligence and diagnostic information, anywhere at any time. Industrial systems that traditionally have been isolated are now facing entirely new challenges that will require new competences and ways of working. Introducing a new type of network in the industrial domain is a big investment, with high risks, often lacking known best practices. Time to market with sufficient quality is of high importance. A lot of time is spent on isolated activates, such as, simulations, updating tools, collecting requirements, design, coding, debugging, documentation, creating testbeds, validation and reviews. Therefore, there is a need to improve the efficiency when moving between the research and development phases for several reasons, e.g., integrate innovative research findings into industrial systems, shorten time to market, and improve product quality. This thesis focuses on improving efficiency during research and development of communication software. First, network evaluation methods are studied, and key industrial challenges are identified. For example, despite a huge research effort on network simulators and virtualization, there are still challenges that need to be addressed, in order for increased industrial benefits. Secondly, this thesis propose a flexible communication stack design that supports different run-time behaviors, from real-time operating system to bare-metal systems without an operating system, and different types of communication protocols, from real-time to non-real-time. Finally, this thesis propose a set of key features from network simulators, that are implemented and used as a case study in a research project. These contributions lead to simplification and increased automation, hence reducing the amount of manual work during research and development.
Inom industrin förväntar sig slutkunderna att produkterna har en livslängd på 10–20 år med hög tillförlitlighet och tillgänglighet. De flesta industriella styrsystem automatiserar säkerhetskritiska processer. Detta gör att aspekter som förutbestämt beteende med små fördröjningar och variationer är avgörande för att skydda person, miljö och egendom. Trender som den nya digitaliseringen, sakernas internet, molnet, 5G, maskininlärning och artificiell intelligens, bidrar till att antalet styrsystem som ansluts till Internet ökar. Ökningen beror mycket på att slutkunder börjar förvänta sig nya tjänster, samt tillgång till affärs- och diagnostikinformation även utanför arbetsplatserna. Att introducera nya kommunikationslösningar inom industrin är ofta en stor investering. Riskerna är oftast höga samtidigt som befintliga kommunikationsteknologier och protokoll behöver stödjas även i framtiden. Att få ut produkterna snabbt på marknaden med bibehållen kvalitet är av stor betydelse. Under forsknings- och utvecklingsarbete spenderas mycket tid på isolerade aktiviteter som till exempel simuleringar, uppdateringar av verktyg, insamling av krav, design, programmering, felsökning, dokumentation, testning och granskningar. Att snabbt byta mellan dessa aktiviteter är ofta inte helt enkelt, på grund av att olika metoder och verktyg inte automatiskt kan utbyta eller överföra information. Fokus i denna avhandling är att förbättra effektiviteten vid forskning och utveckling av kommunikationsmjukvara. Effektiviteten är viktig av flera skäl, till exempel att snabbt integrera nya och innovativa forskningsresultat, snabbare nå marknaden med produkter och förbättra produktkvalitet. Initialt studeras olika metoder för att utvärdera kommunikationsfunktionalitet. Metodernas användbarhet kartläggs i förhållande till aktiviteter under forsknings- och utvecklingsarbete, samt viktiga industriella utmaningar identifieras. Trots stora forskningsinsatser inom nätverkssimulatorer, emulatorer och virtualisering, så finns det fortfarande utmaningar kvar för ökad användbarhet och nytta inom industrin. Vidare föreslås en flexibel kommunikationsstackdesign som stöder olika typer av egenskaper och implementationer, från realtidsoperativsystem till enheter helt utan operativsystem, samt olika typer av kommunikationsprotokoll, från realtid till icke-realtid. Slutligen föreslås en reducerad uppsättning nyckelfunktioner till nätverkssimulatorer, vilka implementerats och använts i en fallstudie i ett forskningsprojekt. Dessa bidrag tillsammans medför en förenkling och ökad automatisering vilket gör att mängden manuellt arbete minskar under forsknings- och utvecklingsarbete.
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24

Boner, Kevin Eugene 1961. "Command control system modeling for evaluating readiness." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276835.

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Анотація:
The objective of this research was to develop a framework whereby the United States Naval Surface Forces could be provided with better information to determine their overall readiness capability. This study utilized the new Readiness Assessment and Reporting Standard (S9410-AN-STD-010/AEGIS) as a guide. Also, a System Design Methodology was used as a tool to develop mathematical models for generating the readiness capability for a particular system. The specific system selected for demonstrating this framework was the Gun Weapon System (GWS) being developed for the Arleigh Burke DDG-51 Class Destroyer.
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25

Chow, Alex Chung-Hen. "A generic user interface for hierarchical knowledge-based simulation and control systems." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185303.

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Анотація:
Successful design of the user interface for an interactive system must be sensitive to activities supported by the software and the time users spend in these activities. This dissertation presents a systematic approach to user interface design based on this idea. A control flow model for the interaction between the human and the application is developed and serves as the framework for the proposed approach. Sub-models of the control flow model correspond to actual programming modules and determine the logical system design sequence. The System Entity Structure language is employed to span hierarchical spaces. User interface design is based on the space dimensions of the System Entity Structure pruning process. A Virtual Tree Environment is developed on the TI Explorer to provide a programming facility for implementing user-interfaces. Following the proposed methodology, a system designer can give users an efficient user interface to applications that can be hierarchically described by the System Entity Structure language. The concept can also be implemented on other window systems such as Microsoft Windows and X-windows.
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26

Cornwall, Maxwell W. "MEEBS a model for multi-echelon evaluation by simulation /." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA237099.

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Анотація:
Thesis (M.S. in Management)--Naval Postgraduate School, June 1990.
Thesis Advisor(s): McMasters, Alan W. ; Bailey, Michael P. "June 1990." Description based on signature page as viewed on October 21, 2009. DTIC Identifier(s): Computerized simulation, logistics management. Author(s) subject terms: Multi-echelon, simulation, SLAM II, models. Includes bibliographical references (p. 142-147). Also available in print.
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27

Guo, Yisong. "Using Agent-Based Models to Understand Multi-Operator Supervisory Control." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/2970.

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Анотація:
As technology advances, many practical applications require human-controlled robots. For such applications, it is useful to determine the optimal number of robots an operator should control to maximize human efficiency given different situations. One way to achieve this is through computer simulations of team performance. In order to factor in various parameters that may affect team performance, an agent-based model will be used. Agent-based modeling is a computational method that enables a researcher to create, analyze, and experiment with models composed of agents that interact within an environment [12]. We construct an agent-based model of humans interacting with robots, and explore how team performance relates to different agent parameters and team organizational structures [21]. Prior work describes interaction between a single operator and multiple robots, while this work includes multi-operator performance and coordination. Model parameters include neglect time, interaction time, operator slack time, level of robot autonomy, etc. Understanding the parameters that influence team performance will be a step towards finding ways to maximize performance in real life human-robot systems.
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28

Kencke, David Leighton. "Simulation and control of secondary electron programming in flash EEPROM's /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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29

Franklin, Gene C. "Computer simulation of a cruise missile using brushless DC motors fin control." Thesis, Monterey, California. Naval Postgraduate School, 1985. http://hdl.handle.net/10945/21215.

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30

Silva, Marco Jorge Tome da. "Simulation of human motion data using short-horizon model-predictive control." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43041.

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Анотація:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.
Includes bibliographical references (p. 52-56).
Many data-driven animation techniques are capable of producing high quality motions of human characters. Few techniques, however, are capable of generating motions that are consistent with physically simulated environments. Physically simulated characters, in contrast, are automatically consistent with the environment, but their motions are often unnatural because they are difficult to control. We present a model-predictive controller that yields natural motions by guiding simulated humans toward real motion data. During simulation, the predictive component of the controller solves a quadratic program to compute the forces for a short window of time into the future. These forces are then applied by a low-gain proportional-derivative component, which makes minor adjustments until the next planning cycle. The controller is fast enough for interactive systems such as games and training simulations. It requires no precomputation and little manual tuning. The controller is resilient to mismatches between the character dynamics and the input motion, which allows it to track motion capture data even where the real dynamics are not known precisely. The same principled formulation can generate natural walks, runs, and jumps in a number of different physically simulated surroundings.
by Marco da Silva.
S.M.
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31

Stuckey, Eric J. (Eric James) 1974. "Development of a run by run control benchmarking and simulation system." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50504.

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Анотація:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
Includes bibliographical references (p. 68-69).
As the semiconductor industry begins to move toward the introduction of fault detection and classification as well as run by run (RbR) process control methodologies, the identification of application scenarios and the means to compare and benchmark available solutions is an essential step. That step has been taken for FDC, and its importance for RbR has been recognized. The work presented here examines the feasibility of such an activity for run by run control including the determination of appropriate scenarios for run by run control, and determining how meaningful comparisons or benchmarking between controllers can be accomplished. There have been a number of benefits as a result of this project. First, we have shown that the benchmarking of run by run controllers is indeed feasible, and through the development of a run by run control simulation and benchmarking framework, and the determination of a set of process scenarios, SEMATECH is well-prepared for future efforts that might undertake benchmarking and/or demonstration of available commercial and experimental run by run controllers in specific realistic scenarios. Second, we now have a better understanding of the demands on and capabilities of run by run control, as well as a better understanding of the requirements of a successful benchmarking system. This information has been obtained through a literature survey and a questionnaire distributed to SEMATECH member companies to solicit feedback on the requirements and opportunities for run by run control and run by run control benchmarking. Third, we have defined and implemented several control scenarios that can serve as benchmarking cases in a future benchmarking effort. And finally, experience has been gained in using messaging protocols to connect RbR controllers to process simulators (or actual process tools) that can be beneficial in defining a standard set of communications for RbR controllers and other process peripherals.
by Eric J. Stuckey.
S.M.
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32

Liu, Pi-Shien 1960. "Real-time process control and simulation for chemical mix facility." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276673.

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Анотація:
The purpose of this study is to design a real-time control and simulation system for a chemical mix facility. A simulation circuit board and software simulation in an IBM personal computer emulated the real-time chemical mix facility. A second personal computer controlled the plant. The parallel port in the IBM PC computer serves as a communication path between the controlled and controlling system. Results show that the simulation can assist the design of the actual system.
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33

Schmidt, Michael David. "SIMULATION AND CONTROL OF A QUADROTOR UNMANNED AERIAL VEHICLE." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_theses/93.

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Анотація:
The ANGEL project (Aerial Network Guided Electronic Lookout) takes a systems engineering approach to the design, development, testing and implementation of a quadrotor unmanned aerial vehicle. Many current research endeavors into the field of quadrotors for use as unmanned vehicles do not utilize the broad systems approach to design and implementation. These other projects use pre-fabricated quadrotor platforms and a series of external sensors in a mock environment that is unfeasible for real world use. The ANGEL system was designed specifically for use in a combat theater where robustness and ease of control are paramount. A complete simulation model of the ANGEL system dynamics was developed and used to tune a custom controller in MATLAB and Simulink®. This controller was then implemented in hardware and paired with the necessary subsystems to complete the ANGEL platform. Preliminary tests show successful operation of the craft, although more development is required before it is deployed in field. A custom high-level controller for the craft was written with the intention that troops should be able to send commands to the platform without having a dedicated pilot. A second craft that exhibits detachable limbs for greatly enhanced transportation efficiency is also in development.
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34

McCartney, Shauna. "The simulation and control of a grid-connected wind energy conversion system." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4680.

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Анотація:
With the rising cost of petroleum, concerns about exhausting the fossil fuels we depend on for energy, and the subsequent impacts that the burning of these types of fuels have on the environment, countries around the world are paying close attention to the development of renewable types of energy. Consequently, researchers have been trying to develop ways to take advantage of different types of clean and renewable energy sources. Wind energy production, in particular, has been growing at an increasingly rapid rate, and will continue to do so in the future. In fact, it has become an integral part in supplying our future energy needs, making further advancements in the field exceedingly critical. A 2 MW wind energy conversion system (WECS) is presented and has been simulated via the dynamic simulation software Simulink. This WECS consists of a 2 MW permanent magnet synchronous generator connected to the transmission grid through a power conversion scheme. The topology of this converter system consists of a passive AC/DC rectifier as well as a PWM DC/AC IGBT inverter, used to interface the DC link with the grid. The inverter has an integrated current control system for power factor correction to improve output power stability. The described WECS enhances grid-side tolerance by buffering wind power disturbances demonstrated by its capability to isolate the grid from wind speed fluctuations. It also optimizes wind energy capture through harmonic filtering, enhancing output power quality. These findings have the potential to lead to further advancements including the capability for island operation and integration to a smart grid.
ID: 029050708; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (M.S.E.E.)--University of Central Florida, 2010.; Includes bibliographical references (p. 66-70).
M.S.E.E.
Masters
Department of Electrical Engineering and Computer Science
Engineering and Computer Science
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35

Onal, Kerem. "Internet Multicast Congestion Control." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604726/index.pdf.

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Анотація:
Congestion control is among the fundamental problems of Internet multicast. It is an active research area with many challenges. In this study, an introduction to Internet congestion control and a brief literature survey of current multicast congestion control protocols is presented. Then two recently proposed &ldquo
single-rate, end-to-end, rate based&rdquo
class of protocols, namely LESBCC and TFMCC are evaluated with respect to their intersession fairness (TCP-friendliness), smoothness and responsiveness criteria. Throughout the experiments, which are conducted using a widely accepted network simulation tool &lsquo
ns&rsquo
, different topologies have been employed.
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36

Gururajan, Srikanth. "Design and simulation of advanced fault tolerant flight control schemes." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4915.

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Анотація:
Thesis (Ph. D.)--West Virginia University, 2006.
Title from document title page. Document formatted into pages; contains xii, 132 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 123-128).
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37

Hahn, James Kwangjune. "The use of simulation techniques for motion control of rigid bodies in computer graphics /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487671640056213.

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38

Ye, Yuting. "Simulation of characters with natural interactions." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47540.

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Анотація:
The goal of this thesis is to synthesize believable motions of a character interacting with its surroundings and manipulating objects through physical contacts and forces. Human-like autonomous avatars are in increasing demand in areas such as entertainment, education, and health care. Yet modeling the basic human motor skills of locomotion and manipulation remains a long-standing challenge in animation research. The seemingly simple tasks of navigating an uneven terrain or grasping cups of different shapes involve planning with complex kinematic and physical constraints as well as adaptation to unexpected perturbations. Moreover, natural movements exhibit unique personal characteristics that are complex to model. Although motion capture technologies allow virtual actors to use recorded human motions in many applications, the recorded motions are not directly applicable to tasks involving interactions for two reasons. First, the acquired data cannot be easily adapted to new environments or different tasks goals. Second, acquisition of accurate data is still a challenge for fine scale object manipulations. In this work, we utilize data to create natural looking animations, and mitigate data deficiency with physics-based simulations and numerical optimizations. We develop algorithms based on a single reference motion for three types of control problems. The first problem focuses on motions without contact constraints. We use joint torque patterns identified from the captured motion to simulate responses and recovery of the same style under unexpected pushes. The second problem focuses on locomotion with foot contacts. We use contact forces to control an abstract dynamic model of the center of mass, which sufficiently describes the locomotion task in the input motion. Simulation of the abstract model under unexpected pushes or anticipated changes of the environment results in responses consistent with both the laws of physics and the style of the input. The third problem focuses on fine scale object manipulation tasks, in which accurate finger motions and contact information are not available. We propose a sampling method to discover contact relations between the hand and the object from only the gross motion of the wrists and the object. We then use the abundant contact constraints to synthesize detailed finger motions. The algorithm creates finger motions of various styles for a diverse set of object shapes and tasks, including ones that are not present at capture time. The three algorithms together control an autonomous character with dexterous hands to interact naturally with a virtual world. Our methods are general and robust across character structures and motion contents when testing on a wide variety of motion capture sequences and environments. The work in this thesis brings closer the motor skills of a virtual character to its human counterpart. It provides computational tools for the analysis of human biomechanics, and can potentially inspire the design of novel control algorithms for humanoid robots.
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39

Kontz, Matthew Edward. "Haptic Control of Hydraulic Machinery Using Proportional Valves." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19876.

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Анотація:
Supplying haptic or force feedback to operators using hydraulic machinery such as excavators has the potential to increase operator capabilities. Haptic, robotic, human-machine interfaces enable several enhancing features including coordinated motion control and programmable haptic feedback. Coordinated or resolved motion control supplies a more intuitive means of specifying the equipment's motion. Haptic feedback is used to relay meaningful information back to the user in the form of force signals about digging force acting on the bucket, programmable virtual constraints and system limitations imposed by the mechanism, maximum pressure or maximum flow. In order to make this technology economically viable, the benefits must offset the additional cost associated with implementation. One way to minimize this cost is to not use high-end hydraulic components. For smaller backhoes and mini-excavators this means that the hydraulic systems are comprised of a constant displacement pump and proportional direction control valves. Hydraulic and haptic control techniques suitable for backhoes/excavators are developed and tested on a small backhoe test-bed. A virtual backhoe simulator is created for controller design and human evaluation. Not only is the virtual simulator modeled after the test-bed, but the control algorithm used in the simulator is the same as the actual backhoe test-bed. Data from human subject tests are presented that evaluate the control strategies on both the real and virtual backhoe. The end goal of this project is to incorporate coordinated haptic control algorithms that work with low-cost systems and maximize the enhancement of operator capabilities.
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40

Wang, Feng. "Adaptive fuzzy network with application to neural prosthetic control, a computer simulation study." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0028/MQ40121.pdf.

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41

MacPherson, David L. "A computer simulation study of rule-based control of an autonomous underwater vehicle." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/22978.

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Анотація:
Approved for public release; distribution is unlimited
Man has an ever-increasing desire for machines to do his work for him. Unmanned vehicles that perform routine or hazardous tasks are receJ.vJ.ng a great deal of attention. Vehicles for unmanned submersible applications are becoming more feasible as strides are made in very large scale integration of computer hardware. This work focuses on development of algorithms and ideas for the computer control of military Autonomous Underwater Vehicles (AUVs). Both a Lisp machine and a graphics workstation, communicating via an Ethernet network, were used in this thesis to develop AUV simulator software. The emphasis has been placed on developing a computer graphic simulation of the control panel of an AUV and on a family of programs that define AUV missions. An AUV mission is a complete. software plan designed to control an AUV as it executes the steps to achieve '" some goal or objective. AUV missions are executed by this simulator in a fully autonomous mode once certain mission parameters are supplied by a human user.
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42

Sifakis, Eftychios D. "Algorithmic aspects of the simulation and control of computer generated human anatomy models /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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43

Hong, Min. "Implicit constraint enforcement to control the physically-based biomedical simulation /." Connect to full text via ProQuest. IP filtered, 2005.

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44

Jacobs, Gregory. "Simulation, Control Design, and Experiments on Single and Double Inverted Pendulum Systems." Thesis, Southern Illinois University at Edwardsville, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10010746.

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The discipline of control engineering has been applied for thousands of years. As long as humans have needed a system to vary automatically, different devices, electronics and algorithms have been designed to attain system control and stability. This study intends on implementing the theory developed my mathematicians such as Henri Poincaré, Aleksandr Lyapunov, Rudolf E. Kálmán and many others in an attempt to stabilize an unstable system: a cart and inverted pendulum. In order to stabilize the inverted pendulum system, control designs consisting of both classical and modern approaches will be explored to design effective PID and LQR controllers. Furthermore, an adaptive controller will be designed as well for a one-degree-of-freedom unstable system. For accurate control design, linear and non-linear system identification techniques will be used to attain mathematical dynamic system models. Multiple tuning techniques will be utilized to achieve the most stable system possible. A micro-processor (Arduino) will be used in conjunction with a computer for data communication and digital control algorithms. The utilization of an Arduino will require the design and implementation of digital control systems, digital tuning techniques, and digital filtering. If successful, the implemented theory will result in the stabilization of a multiple degree of freedom system with chaotic potential.

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45

Farley, Mark Harrison. "Predicting machining accuracy and duration of an NC mill by computer simulation." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/16499.

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46

Schultz, Steven E. "Simulation Study of a GPRAM System: Error Control Coding and Connectionism." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5486.

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Анотація:
A new computing platform, the General Purpose Reprsentation and Association Machine is studied and simulated. GPRAM machines use vague measurements to do a quick and rough assessment on a task; then use approximated message-passing algorithms to improve assessment; and finally selects ways closer to a solution, eventually solving it. We illustrate concepts and structures using simple examples.
ID: 031001523; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Adviser: Lei Wei.; Title from PDF title page (viewed August 19, 2013).; Thesis (M.S.E.E.)--University of Central Florida, 2012.; Includes bibliographical references (p. 45).
M.S.E.E.
Masters
Electrical Engineering and Computing
Engineering and Computer Science
Electrical Engineering
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47

Koeppen, Kyle Bruce. "Virtual access hydraulics experiment for system dynamics and control education." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/15906.

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48

Barritt, Brian James. "The Modeling, Simulation, and Operational Control of Aerospace Communication Networks." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1499348546519051.

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49

Lacroix, René. "A framework for the design of simulation-based greenhouse control." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41652.

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Анотація:
The main objectives were: (1) to develop tools to aid in the design of enclosed agro-ecosystems, and (2) to use these tools to develop a prototype simulation-based control system. Three tools were developed: (1) a conceptual framework, (2) a (simulated) greenhouse system and (3) a simulation approach within OS/2.
Part of the conceptual framework was dedicated to "conscious control", defined as a form of control practised by an entity that uses models of itself in its decision-making processes. The greenhouse system was composed of six modules (a simulation manager, a weather generator, a greenhouse model, a crop model, a Pavlovian controller and a cognitive controller), which were implemented under OS/2 as separate processes.
The greenhouse system was used to develop a prototype simulation-based controller. Primarily, the role of the controller was to determine temperature setpoints that would minimize the heating load. The simulation model used by the controller was an artificial neural network. The controller adapted temperature setpoints to anticipated meteorological conditions and reduced greenhouse energy consumption, in comparison with a more traditional controller.
Generally, the results showed the feasibility and illustrated some of the advantages of using simulation-based control. The research resulted in the definition of elements that will allow the creation of a methodological framework for the design of simulation-based control and, eventually, a theory of conscious control.
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50

Chen, Hao. "Simulation of a morphological image processor using VHDL. control mechanism /." Online version of thesis, 1993. http://hdl.handle.net/1850/11744.

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