Dissertations / Theses: 'Automatic control Computer simulation'

1

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

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

2

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Panesar, Kiran S. "Buffer management, adaptive flow control, and automatic incremental state saving in time warp systems." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/8234.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Lew, Alfie Katat 1960. "Astrometric telescope simulator for the design and development of telescope teleoperation." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276844.

Full text

Abstract:

A real-time discrete-event simulation model is built to emulate the functional operations of the Thaw telescope of the Allegheny Observatory and its attached scientific instrument. The OASIS software system is used to communicate with the simulation model. This simulation model, written in Ada, consists of three major parts. The Command Receiver and the Data Transmitter are software written to service the incoming telecommands and outgoing telemetry, the Command Processor is the actual simulator itself consisting of a Command Retriever, a Scanner, a Parser, a Command Interpreter, and the actual Thaw telescope simulation. The motivation for our simulation model and discussion of design issues are presented in chapters 1 and 2. The details of the model are documented in chapters 3, 4, and 5. The final two chapters include examples, questions, thoughts for future work, and conclusions.

APA, Harvard, Vancouver, ISO, and other styles

5

Zarei, Behrouz. "Performance analysis of automatic lookahead generation in parallel discrete event simulation using control flow graphs." Thesis, Lancaster University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274230.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

7

Lewis, W. Ivan. "DACS: an interactive computer program to aid in the design and analysis of linear control systems." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/76039.

Full text

Abstract:

DACS is an interactive computer program for the IBM-PC that aids in the design and analysis of linear control systems. Written in compiled basic, DACS includes Root Locus, Bode plots, Nyquist diagrams, Nichols charts, system simulation, and calculates the system time response in closed-form. The state-space description is used in the simulation and time response segments while the system transfer function is used in the root locus and frequency response segments. Calculated data may be displayed in either graphical or tabular form. Graphics features of DACS include automatic-scaling, zooming, graph coordinates derived from cursor location, graphics screen dumps to disk or printer, and redisplaying of disk files. DACS is menu driven and the majority of input/output is accomplished through the function keys. All system models and data may be saved on and recalled from disk. Help screens, three levels of sound, color, and session archiving are also provided. DACS provides a wide variety of linear control system analysis tools for the engineering desktop.
Master of Science

APA, Harvard, Vancouver, ISO, and other styles

8

Kmiecik, Chris G. "Effects of non-uniform windowing in a Rician-fading channel and simulation of adaptive automatic repeat request protocols." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA236940.

Full text

Abstract:

Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, June 1990.
Thesis Advisor(s): Ha, Tri T. Second Reader: Myers, Glen A. "June 1990." Description based on signature page. DTIC Identifier(s): Digital communications, frequent shift keyers, program listings, protocols. Author(s) subject terms: FFT windowwing, ARQ, fading, frequency shifts. Includes bibliographical references (p. 58). Also available online.

APA, Harvard, Vancouver, ISO, and other styles

9

Rudolph, Frederick M. "Human performance during automation : the interaction between automation, system information, and information display in a simulated flying task." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/36207.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Lin, Wen-Hsing. "A comprehensive computer program for the control of first-order process with time delay." Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1178132732.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Christine, Heritier-Pingeon. "Une aide à la conception de systèmes de production basée sur la simulation et l'analyse de données." Phd thesis, INSA de Lyon, 1991. http://tel.archives-ouvertes.fr/tel-00840151.

Full text

Abstract:

Les formes nouvelles de la concurrence imposent aux systèmes de production une flexibilité de plus en plus grande. Dans le cas de systèmes automatisés, les décisions prises lors de la conception vont fortement conditionner les possibilités du futur système ainsi que ses capacités d'adaptation aux changements, donc son degré de flexibilité. Le travail contenu dans ce mémoire s'attache précisément à l'étude de méthodes et d'outils d'aide à la décision pour la conception de systèmes de production. Le lecteur est d'abord introduit au domaine puis aux outils et méthodes utilisés. Le modèle d'atelier qui sert de support à la démarche est alors présenté : il est suivi d'une réflexion sur la construction des campagnes de simulations conduites à partir de ce modèle, réflexion concrétisée par la définition d'un module de génération automatique de plans de simulations associés au modèle d'atelier choisi. L'analyse des données utilisées comme méthode d'acquisition des connaissances sur le comportement des systèmes de production est ensuite envisagée : une méthode d'analyse est proposée et expérimentée. Ce travail a été développé avec le souci constant d'explorer les possibilités de l'analyse de données dans le domaine et d'évaluer ces possibilités sur la base de nombreuses expériences.

APA, Harvard, Vancouver, ISO, and other styles

12

Liu, Kai, and 劉愷. "Optimal dispatch and management for smart power grid." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46336680.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Ng, Kwok-kei Simon, and 吳國基. "Optimal planning and management of stochastic demand and renewable energy in smart power grid." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B50434299.

Full text

Abstract:

To combat global climate change, the reduction of carbon emissions in different industries, particularly the power industry, has been gradually moving towards a low-carbon profile to alleviate any irreversible damage to the planet and our future generations. Traditional fossil-fuel-based generation is slowly replaced by more renewable energy generation while it can be harnessed. However, renewables such as solar and wind are stochastic in nature and difficult to predict accurately. With the increasing content of renewables, there is also an increasing challenge to the planning and operation of the grid. With the rapid deployment of smart meters and advanced metering infrastructure (AMI), an emerging approach is to schedule controllable end-use devices to improve energy efficiency. Real-time pricing signals combined with this approach can potentially deliver more economic and environmental advantages compared with the existing common flat tariffs. Motivated by this, the thesis presents an automatic and optimal load scheduling framework to help balance intermittent renewables via the demand side. A bi-level consumer-utility optimization model is proposed to take marginal price signals and wind power into account. The impact of wind uncertainty is formulated in three different ways, namely deterministic value, scenario analysis, and cumulative distributions function, to provide a comprehensive modeling of unpredictable wind energy. To solve the problem in off-the-shelf optimization software, the proposed non-linear bi-level model is converted into an equivalent single-level mixed integer linear programming problem using the Karush-Kuhn-Tucker optimality conditions and linearization techniques. Numerical examples show that the proposed model is able to achieve the dual goals of minimizing the consumer payment as well as improving system conditions. The ultimate goal of this work is to provide a tool for utilities to consider the demand response model into their market-clearing procedure. As high penetration of distributed renewable energy resources are most likely applied to remote or stand-alone systems, planning such systems with uncertainties in both generation and demand sides is needed. As such, a three-level probabilistic sizing methodology is developed to obtain a practical sizing result for a stand-alone photovoltaic (PV) system. The first-level consists of three modules: 1) load demand, 2) renewable resources, and 3) system components, which comprise the fundamental elements of sizing the system. The second-level consists of various models, such as a Markov chain solar radiation model and a stochastic load simulator. The third-level combines reliability indices with an annualized cost of system to form a new objective function, which can simultaneously consider both system cost and reliability based on a chronological Monte Carlo simulation and particle swamp optimization approach. The simulation results are then tested and verified in a smart grid laboratory at the University of Hong Kong to demonstrate the feasibility of the proposed model. In summary, this thesis has developed a comprehensive framework of demand response on variable end-use consumptions with stochastic generation from renewables while optimizing both reliability and cost. Smart grid technologies, such as renewables, microgrid, storage, load signature, and demand response, have been extensively studied and interactively modeled to provide more intelligent planning and management for the smart grid.
published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy

APA, Harvard, Vancouver, ISO, and other styles

14

Pedchote, C. "Parameter estimation for non-linear systems: an application to vehicle dynamics." Thesis, Engineering Systems Department, 2009. http://hdl.handle.net/1826/3896.

Full text

Abstract:

This work presents an investigation into the parameter estimation of suspension components and the vertical motions of wheeled vehicles from experimental data. The estimation problems considered were for suspension dampers, a single wheel station and a full vehicle. Using conventional methods (gradient-based (GB), Downhill Simplex (DS)) and stochastic methods (Genetic Algorithm (GA) and Differential Evolution (DE)), three major problems were encountered. These were concerned with the ability and consistency of finding the global optimum solution, time consumption in the estimation process, and the difficulties in setting the algorithm's control parameters. To overcome these problems, a new technique named the discrete variable Hybrid Differential Evolution (dvHDE) method is presented. The new dvHDE method employs an integer-encoding technique and treats all parameters involved in the same unified way as discrete variables, and embeds two mechanisms that can be used to deal with convergence difficulties and reduce the time consumed in the optimisation process. The dvHDE algorithm has been validated against the conventional GB, DS and DE techniques and was shown to be more efficient and effective in all but the simplest cases. Its robustness was demonstrated by its application to a number of vehicle related problems of increasing complexity. These include case studies involving parameter estimation using experimental data from tests on automotive dampers, a single wheel station and a full vehicle. The investigation has shown that the proposed dvHDE method, when compared to the other methods, was the best for finding the global optimum solutions in a short time. It is recommended for nonlinear vehicle suspension models and other similar systems.

APA, Harvard, Vancouver, ISO, and other styles

15

Pedchote, Chamnarn. "Parameter estimation for non-linear systems : an application to vehicle dynamics." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/3896.

Full text

Abstract:

This work presents an investigation into the parameter estimation of suspension components and the vertical motions of wheeled vehicles from experimental data. The estimation problems considered were for suspension dampers, a single wheel station and a full vehicle. Using conventional methods (gradient-based (GB), Downhill Simplex (DS)) and stochastic methods (Genetic Algorithm (GA) and Differential Evolution (DE)), three major problems were encountered. These were concerned with the ability and consistency of finding the global optimum solution, time consumption in the estimation process, and the difficulties in setting the algorithm's control parameters. To overcome these problems, a new technique named the discrete variable Hybrid Differential Evolution (dvHDE) method is presented. The new dvHDE method employs an integer-encoding technique and treats all parameters involved in the same unified way as discrete variables, and embeds two mechanisms that can be used to deal with convergence difficulties and reduce the time consumed in the optimisation process. The dvHDE algorithm has been validated against the conventional GB, DS and DE techniques and was shown to be more efficient and effective in all but the simplest cases. Its robustness was demonstrated by its application to a number of vehicle related problems of increasing complexity. These include case studies involving parameter estimation using experimental data from tests on automotive dampers, a single wheel station and a full vehicle. The investigation has shown that the proposed dvHDE method, when compared to the other methods, was the best for finding the global optimum solutions in a short time. It is recommended for nonlinear vehicle suspension models and other similar systems.

APA, Harvard, Vancouver, ISO, and other styles

16

Авраменко, Віктор Васильович, Виктор Васильевич Авраменко, Viktor Vasylovych Avramenko, and С. О. Завгородній. "Комп’ютерне моделювання роботи нелінійної системи автоматичного регулювання температури." Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39165.

Full text

Abstract:

Системи автоматичного регулювання (САР) здійснюють підтримку заданих значень режимних параметрів різноманітних об’єктів, в тому числі таких, що описуються нелінійними диференціальними рівняннями. Порушення принципу суперпозиції в нелінійних системах призводить до цілого ряду стійких і нестійких режимів їхньої поведінки. Крім того, в системі можуть виникати автоколивання. Тому в наш час розвиваються методи аналізу нелінійних САР, що мають на меті вирішити проблему керування нелінійними об’єктами. Одним з цих методів є комп’ютерне моделювання роботи САР при певних заданих початкових умовах.

APA, Harvard, Vancouver, ISO, and other styles

17

Almeida, Diony José de. "Proposta de um sistema de simulação e diagnóstico de falhas aplicado a um sistema de produção." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1397.

Full text

Abstract:

Este trabalho apresenta uma proposta de um software de simulação e diagnóstico de falhas aplicado a um sistema de automação. para realizar esta tarefa foi desenvolvido um estudo de caso que contem um problema de automação industrial. Deste estudo foi retirado um modelo, usado como base para criar do software de simulação que segue as especificações dos modelos, no qual é possível observar a evolução dos eventos através de sua linguagem e diagnosticar falhas, quando estas ocorrem em uma das máquinas da planta. O processo de diagnóstico de falhas tem como base as regras de diagnosticabilidade apresentadas na literatura. As máquinas, assim como suas restrições, são modeladas dentro do próprio software, onde são definidas as estruturas de cada automato assim como características como observabilidade, controlabilidade e a possibilidade de falhar. Os testes realizados no sistema apresentado mostraram que a linguagem de controle consegue, mesmo permitindo um nivel de liberdade ao sistema, identificar as falhas verificando somente para os eventos que ocorrem após a ocorrência da mesma.
This work we presents a proposal a software of simulation and fault diagnosis applied to an automation system. In that task was developed , a case study that contains a problem of industrial automation. The study was used as the source for creating the simulation that follows the specifications of software models, where you can observe the evolution of events through its language and diagnose faults when they occur in one of the machines of the plant. The process of fault diagnosis is based on the rules of diagnosticabilidades presented in the literature. The machines, as well as its restrictions are modeled within the software itself, where the structures of each automaton are defined the caracteristics as observability an the possibility of failure. The tests in the system showed that of the language used can allowing identify fails, checking only for events that occorem after the occurence the fails.

APA, Harvard, Vancouver, ISO, and other styles

18

Manoonpong, Poramate. "Neural preprocessing and control of reactive walking machines : towards versatile artificial perception-action systems /." Berlin : Springer, 2007. http://sfx.ethz.ch/sfx_locater?sid=ALEPH:EBI01&genre=book&isbn=978-3-540-68802-0&id=doi:10.1007/978-3-540-68803-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Fiorentini, Davide. "Design of a Cartesian Robot for Agro-Food Applications." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

Find full text

Abstract:

Nella tesi si affronta il problema della progettazione di un sistema meccatronico fortemente automatizzato per applicazioni agricole. In particolare il progetto è rivolto alla costruzione di una macchina per l’attività di raccolta automatizzata di teste di broccoli disposte in filari presenti in campo coltivato. Il fine dello studio, tramite l’applicazione su un vegetale specifico, è l’introduzione di tecnologie di uso ormai comune nel campo industriale in un settore tradizionalmente poco sensibile all’innovazione come quello agricolo. La progettazione deve quindi tenere conto di diverse problematiche di natura differente a quelle tipicamente industriali ed adoperare opportuni accorgimenti. L’ideazione di un sistema essenzialmente completo e funzionale, con relativa simulazione di un tipico ciclo di lavoro, si presta successivamente ad ulteriori valutazioni non esclusivamente tecniche ma anche di tipo economico. Dopo un’analisi generale dello scenario, si è trovato idoneo l’utilizzo di un robot cartesiano montato sopra una macchina agricola guidata da un operatore. Viene concretizzato il disegno ed il dimensionamento delle varie componenti meccaniche, compreso il manipolatore. In seguito è creato un modello matematico del sistema fisico utile a simulare il funzionamento della macchina. Particolare attenzione è data al controllo del robot in quanto risultante essere la parte più critica del sistema. E’ inoltre fornito il controllo temporizzato delle varie azioni. Infine si è effettuata una simulazione al calcolatore di un tipico ciclo di raccolta su una singola testa broccolo. Il vegetale, riconosciuto dalla macchina, viene raccolto secondo una sequenza di azioni sincronizzate tra loro e depositato in un punto specifico nel raggio di azione del robot. Sono inoltre forniti elementi sugli aspetti simulativi e sull’integrazione tra varie componenti del sistema complesso.

APA, Harvard, Vancouver, ISO, and other styles

20

Aybar, Guray. "Simulation And Performance Evaluation Of A Distributed Real-time Communication Protocol For Industrial Embedded Systems." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613921/index.pdf.

Full text

Abstract:

The Dynamic Distributed Dependable Real-Time Industrial communication Protocol (D3RIP) provides service guarantees for Real-Time traffic and integrates the dynamically changing requirements of automation applications in their operation to efficiently utilize the resources. The protocol dynamically allocates the network resources according to the respective system state. To this end, the protocol architecture consists of an Interface Layer that provides time-slotted operation and a Coordination Layer that assigns each time slot to a unique transmitter device based on a distributed computation. In this thesis, a software simulator for D3RIP is developed. Using the D3RIP Simulator, modifications in D3RIP can be easily examined without facing complexities in real implementations and extensive effort in terms of time and cost. The simulator simulates the Interface Layer, the Coordination Layer and additionally, the Shared Medium. Hence, using the simulator, the system-protocol couple can be easily analyzed, tested and further improvements on D3RIP can be achieved with the least amount of effort. The simulator implements the Timed Input Output Automata (TIOA) models of the D3RIP stack components using C++. The resulting code is compiled on GCC (Gnu Compiler Collection). The logs of the simulation runs and the real system with 2 devices connected via cross 100MbE cables are compared. In a 3ms time slot, the simulator and the system incidents differ about 135µ
s on the average, causing no asynchronousity in their instantaneous operational states. The D3RIP Simulator is useful in keeping track of any variable in the D3RIP system automaton at any instant up to 1µ
s resolution.

APA, Harvard, Vancouver, ISO, and other styles

21

Soulage, Rémi. "Contribution à l'étude et à l'amélioration de la qualité de service sur un réseau maillé WiFi." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2011. http://tel.archives-ouvertes.fr/tel-00750468.

Full text

Abstract:

Si l'utilisation de voix et vidéo sur ip fonctionne correctement sur un réseau WiFi avec un seul point d'accès, les performances en terme de qualité de service sont altérées sur un réseau WiFi maillé où chaque point d'accès sert de relais aux suivants. En effet, le partage d'un même canal radio sur de grandes surfaces par plusieurs noeuds qui ne se captent pas toujours permet difficilement d'établir des communications nécessitant de la qualité de service. La difficulté d'une analyse par expérimentation, due à la difficulté d'observation des communications, a orienté l'étude vers la simulation. En l'absence de simulateurs existants adéquats au vu d'un réseau maillé qui est un concept récent, l'objet de cette thèse est la création, l'étude et l'exploitation d'un simulateur, basé sur des réseaux de Petri, permettant la simulation de communications sur un réseau maillé WiFi. Les améliorations apportées par cette étude ont pour but d'être implémentées sur un matériel existant afin d'offrir un service de transport de voix et de vidéo sur un réseau WiFi maillé. Les premières simulations réalisées à l'aide de cet outil ont fait apparaître des pertes de paquets et des altérations de la gigue due à l'état des files d'attente d'émission de certains noeuds. Après avoir identifié des leviers accessibles sur le matériel existant sur lequel peuvent être effectivement apportées des améliorations tout en restant dans le cadre de la norme, une approche automatique et réseaux a mis en évidence des stratégies d'améliorations possibles de la qualité de service nécessaire pour des communications audio et vidéo.

APA, Harvard, Vancouver, ISO, and other styles

22

Simão, Jean Marcelo. "Contribution au Développement d'un Outil de Simulation de Systèmes Holoniques de Production et Proposition d'un Meta-Modèle de Contrôle Holonique." Phd thesis, Université Henri Poincaré - Nancy I, 2005. http://tel.archives-ouvertes.fr/tel-00083042.

Full text

Abstract:

Le présent contexte et les tendances autour des systèmes de production modernes, comme la personnalisation de masse, conduisent à des besoins d'améliorations en ce qui concerne l'agilité des organisations de production. Ainsi, des approches agiles ont été proposées telle que l'approche holonique. Dans des Systèmes Manufacturiers Holoniques (HMS) les entités de production, par exemple les ressources et les produits, sont envisagées avec un certain degré d´expertise. Ces entités expertes sont appelées holons (HLs) et leur expertise concerne les habiletés d'autonomie et de collaboration.
L'HMS contient aussi le Contrôle Holonique (HC) qui doit organiser proprement les collaborations des holons pour atteindre de l'agilité. En effet, le développement des HMS demande des outils d'ingénierie d´aide au projet et aux tests. Dans cette thèse, il est proposé un meta-modèle pour HC dont les systèmes dérivés sont simulés dans un outil appelé ANALYTICE II. Cet outil présente une séparation précise entre les entités de contrôle du haut niveau et les ressources émulées.
Premièrement, avant de proposer le meta-modèle pour l´HC, l'holonification de ressource est proposée dans cet environnement. Chaque Resource-HL est obtenue à l'aide d'une ressource virtuelle qui permet d'accéder des données et des services d'une ressource émulée au haut niveau de contrôle. Par la suite, il est proposé le meta-modèle pour l´HC, sur les Resource-HLs, dans une orientation au processus.
L'essence de la solution est inspirée des concepts des Systèmes à Base de Règles (RBS) où les relations causales du contrôle sont traitées par des entités appelées Rules. Le processus d'inférence dans ce genre de RBS a été obtenu grâce à des collaborations basées sur notifications. Les Resource-HLs notifient les Rules par milieu de la connaissance factuelle, comme leurs états. Chaque Rule notifié délibère au moment approprié sur l'exécution d´une certaine action de contrôle.
L'inférence se passe dans une chaîne de notifications grâce à une composition de Resource-HLs et de Rules basées sur agents. Ce type d'inférence apporte des avantages pour l'HC tels que la haute réactivité et le découplage des éléments. Il permet aussi la création de mécanismes coopératifs pour répondre aux besoins du contrôle comme le déterminisme et la résolution de conflits. De plus, cette approche de contrôle orientée aux règles permet d´obtenir une implémentation et une expression cohérentes du contrôle.
Les mécanismes de contrôle sont émergés à partir de la connaissance causale de contrôle exprimée par des experts dans les Rules. Des experts sont exclusivement impliqués dans la connaissance de contrôle appropriée pour exploiter les flexibilités du système en cherchant de l'agilité. En outre, certains experts pourraient être des agents artificiels pour traiter de façon automatique la connaissance des Rules. En résumé, cette solution de HC orientée au processus traite simultanément un ensemble de sujets de contrôle encore en s'agitant d'une solution indépendante et aussi ouverte.
En fait, l'ouverture de la solution permet son interprétation comme une solution orientée au produit. Le contrôle orienté au produit est une tendance pour trouver de l'agilité via le découplage des demandes de production et ses exécutions en utilisant des entités comme les Smart-Product-HLs. Chaque Smart-Product-HL concerne un ordre de production spécifique et personnalisée. Les Smart-Product-HLs, avec une certaine autonomie, utilisent les Resource-HLs pour répondre à ses besoins de production.
Dans l'interprétation du meta-modèle, leurs interactions sont organisées en utilisant les Rules pour la coopération des Resource-HLs qu'empêchent des comportements impropres du système. Dans ce contexte, l'exécution des Rules dépend de l'intérêt explicite des Smart-Product-HLs dans leurs utilisations. En quelque sorte, chaque Smart-Product-HL utilise des Rules comme un genre d'expert. La solution a été appliquée dans un ensemble d´exemples en ANALYTICE II qui ont présenté une certaine indépendance de la simulation, celle-ci parce que chaque système de contrôle n'est pas conscient que les Resource-HLs et les Smart-Product-HLs sont simulés.

APA, Harvard, Vancouver, ISO, and other styles

23

Araujo, Carlos Eduardo de. "Implante neural controlado em malha fechada." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1687.

Full text

Abstract:

Um dos desafios propostos por pesquisadores em neurociência aos engenheiros biomédicos é a interação cérebro-máquina. O sistema nervoso comunica-se interpretando sinais eletroquímicos, e circuitos implantáveis podem tomar decisões de modo a interagir com o meio biológico. Sabe-se também que a doença de Parkinson está relacionada a um déficit do neurotransmissor dopamina. Para controlar a concentração de dopamina diferentes técnicas tem sido empregadas como estimuladores elétricos, magnéticos e drogas. Neste trabalho obteve-se o controle da concentração do neurotransmissor de maneira automática uma vez que atualmente isto não é realizado. Para tanto, projetou-se e desenvolveu-se quatro sistemas: a estimulação cerebral profunda ou deep brain stimulation (DBS), a estimulação transmagnética ou transmagnetic stimulation (TMS), um controle de bomba de infusão ou infusion pump control (IPC) para a entrega de drogas e um sistema de voltametria cíclica de varredura rápida ou fast scan ciclic voltammetry (FSCV) (circuito que detecta variações de concentração de neurotransmissores como a dopamina - DA). Também foi necessário o desenvolvimento de softwares para a visualização de dados e análises em sincronia com acontecimentos ou experimentos correntes, facilitando a utilização destes dispositivos quando emprega-se bombas de infusão e a sua flexibilidade é tal que a DBS ou a TMS podem ser utilizadas de maneira manual ou automática além de outras técnicas de estimulação como luzes, sons, etc. O sistema desenvolvido permite controlar de forma automática a concentração da DA. A resolução do sistema é de 0.4 µmol/L podendo-se ajustar o tempo para correção da concentração entre 1 e 90 segundos. O sistema permite controlar concentrações entre 1 e 10 µmol/L, com um erro de cerca de +/- 0,8 µmol/L. Embora desenhado para o controle da concentração de dopamina o sistema pode ser utilizado para controlar outros neurotransmissores. Propõe-se continuar o desenvolvimento em malha fechada empregando FSCV e DBS (ou TMS, ou infusão), utilizando modelos animais parkinsonianos.
One of the challenges to biomedical engineers proposed by researchers in neuroscience is brain machine interaction. The nervous system communicates by interpreting electrochemical signals, and implantable circuits make decisions in order to interact with the biological environment. It is well known that Parkinson’s disease is related to a deficit of dopamine (DA). Different methods has been employed to control dopamine concentration like magnetic or electrical stimulators or drugs. In this work was automatically controlled the neurotransmitter concentration since this is not currently employed. To do that, four systems were designed and developed: deep brain stimulation (DBS), transmagnetic stimulation (TMS), Infusion Pump Control (IPC) for drug delivery, and fast scan cyclic voltammetry (FSCV) (sensing circuits which detect varying concentrations of neurotransmitters like dopamine caused by these stimulations). Some softwares also were developed for data display and analysis in synchronously with current events in the experiments. This allowed the use of infusion pumps and their flexibility is such that DBS or TMS can be used in single mode and other stimulation techniques and combinations like lights, sounds, etc. The developed system allows to control automatically the concentration of DA. The resolution of the system is around 0.4 µmol/L with time correction of concentration adjustable between 1 and 90 seconds. The system allows controlling DA concentrations between 1 and 10 µmol/L, with an error about +/- 0.8 µmol/L. Although designed to control DA concentration, the system can be used to control, the concentration of other substances. It is proposed to continue the closed loop development with FSCV and DBS (or TMS, or infusion) using parkinsonian animals models.

APA, Harvard, Vancouver, ISO, and other styles

24

Al, Bluwi Ibrahim. "Méthodes inspirées de la robotique pour la simulation des changements conformationnels des protéines." Phd thesis, INSA de Toulouse, 2012. http://tel.archives-ouvertes.fr/tel-00737553.

Full text

Abstract:

Cette thèse présente une approche de modélisation inspirée par la robotique pour l'étude des changements conformationnels des protéines. Cette approche est basée sur une représentation mécanistique des protéines permettant l'application de méthodes efficaces provenant du domaine de la robotique. Elle fournit également une méthode appropriée pour le traitement " gros-grains " des protéines sans perte de détail au niveau atomique. L'approche présentée dans cette thèse est appliquée à deux types de problèmes de simulation moléculaire. Dans le premier, cette approche est utilisée pour améliorer l'échantillonnage de l'espace conformationnel des protéines. Plus précisément, cette approche de modélisation est utilisée pour implémenter des classes de mouvements pour l'échantillonnage, aussi bien connues que nouvelles, ainsi qu'une stratégie d'échantillonnage mixte, dans le contexte de la méthode de Monte Carlo. Les résultats des simulations effectuées sur des protéines ayant des topologies différentes montrent que cette stratégie améliore l'échantillonnage, sans toutefois nécessiter de ressources de calcul supplémentaires. Dans le deuxième type de problèmes abordés ici, l'approche de modélisation mécanistique est utilisée pour implémenter une méthode inspirée par la robotique et appliquée à la simulation de mouvements de grande amplitude dans les protéines. Cette méthode est basée sur la combinaison de l'algorithme RRT (Rapidly-exploring Random Tree) avec l'analyse en modes normaux, qui permet une exploration efficace des espaces de dimension élevée tels les espaces conformationnels des protéines. Les résultats de simulations effectuées sur un ensemble de protéines montrent l'efficacité de la méthode proposée pour l'étude des transitions conformationnelles.

APA, Harvard, Vancouver, ISO, and other styles

25

Fadi, Abdallah el. "Spécification comportementale temporelle dans un simulateur multi-niveaux." Grenoble INPG, 1988. http://www.theses.fr/1988INPG0039.

Full text

Abstract:

Cette thèse aborde les problèmes de la validation automatique dans le domaine CAO de matériels informatiques et électroniques, en liaison avec des techniques de simulation mixte. Le but a été d'établir une méthodologie de spécification comportementale basée sur l'utilisation de primitives logiques et temporelles permettant de conditionner certaines propriétés des systèmes modélises et simulés

APA, Harvard, Vancouver, ISO, and other styles

26

Johnston, Matthew W. "Computer Modeling the Incursion Patterns of Marine Invasive Species." NSUWorks, 2015. http://nsuworks.nova.edu/occ_stuetd/33.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Fröberg, Anders. "Efficient Simulation and Optimal Control for Vehicle Propulsion." Doctoral thesis, Linköpings universitet, Fordonssystem, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11475.

Full text

Abstract:

Efficient drive cycle simulation of longitudinal vehicle propulsion models is an important aid for design and analysis of power trains. Tools on the market today mainly use two different methods for such simulations, forward dynamic or quasi-static inverse simulation. Here known theory for stable inversion of non linear systems is used in order to combine the fast simulation times of the quasi-static inverse simulation with the ability of including transient dynamics as in the forward dynamic simulation. The stable inversion technique with a new implicit driver model together forms a new concept, inverse dynamic simulation. This technique is demonstrated feasible for vehicle propulsion simulation and specifically on three powertrain applications that include important dynamics that can not be handled using quasi-static inverse simulation. The extensions are engine dynamics, drive line dynamics, and gas flow dynamics for diesel engines, which also are selected to represent important properties such as zero dynamics, resonances, and non-minimum phase systems. It is shown that inverse dynamic simulation is easy to set up, gives short simulation times, and gives consistent results for design space exploration. This makes inverse dynamic simulation a suitable method to use for drive cycle simulation, especially in situations requiring many simulations, such as optimization over design space, powertrain configuration optimization, or development of powertrain control strategies. Optimal vehicle propulsion control is developed with special focus on heavy trucks used for long haulage. The power to mass ratio for a typical heavy duty truck makes even moderate road slopes significant in the sense that it is impossible to keep a constant cruising speed. This gives an interesting problem how to control vehicle speed such that fuel consumption is minimized. Todays telematic systems together with three dimensional roadmaps can provide the vehicle control system with information of the road topography. This enables intelligent cruise controllers that utilize this information to control engine fueling and gear shifting such that an optimal speed trajectory is obtained. First the optimal control problem is solved numerically by dynamic programming, giving a controller with real time capabilities that can be used on-line in the vehicles control system. Simulations of such a system on authentic road profiles show that it has potential for significant fuel savings. To achieve knowledge about the underlying physics that affects the optimal solution, the optimal control problem is solved in detail and analytical expressions for the conditions of optimality are derived. Those expressions are then used to find optimal solutions on constructed test road profiles. Such test cases point out the typical behavior of an optimal solution and also which parameters that are decisive for the fuel minimization problem, and also how they quantitatively influence the behavior. It is for example shown that small non-linearities in the engine torque characteristics have significant effect on the optimal control strategy. The solutions for the non linear engine model have a smoother character but also require longer prediction horizons. For optimal gear ratio control it is shown that the maximum fueling function is essential for the solution. For example, in the case of a continuously variable transmission it is shown that the gear ratio never is chosen such that engine speed exceeds the speed of maximum engine power. For a discrete step transmission the gear shifting losses are essential for the optimal shift positions, but over all the solutions are close to continuous solutions.

APA, Harvard, Vancouver, ISO, and other styles

28

Donald, Rickey. "Dynamic simulation of hot blast stoves with automatic control." Thesis, Queensland University of Technology, 1992. https://eprints.qut.edu.au/133647/1/DYNAMIC%20SIMULATION%20OF%20HOT%20BLAST%20STOVES%20WITH%20AUTOMATIC%20CONTROL_Digitised%20Thesis.pdf.

Full text

Abstract:

The energy efficiency of an ironmaking blast furnace is significantly improved through the use of air pre-heated in large regenerative heat exchangers called stoves. Critical to the furnace operation is ensuring that a constant blast temperature is maintained. There are usually three stoves per furnace, and automatic control of the stoves operation allows a reduction in energy costs, an increase in refractory life and higher blast temperatures. A computer simulation ·model of the stoves has been developed based on a mathematical model of the heat transfer and combustion mechanisms. The simulation model incorporates an automatic control scheme which utilises a condition based changeover management system with a predictive algorithm to optimise the stove heating rate. The model results were shown to agree well with process data from the stoves at BHP Newcastle No. 4 Blast Furnace. Using the simulation model, it was demonstrated that the effectiveness of the automatic control scheme was superior to that of manual control under dynamic operating conditions.

APA, Harvard, Vancouver, ISO, and other styles

29

Haritos, Georgios. "Automatic semi/automatic generation of software to control flexible manufacturing cells." Thesis, Staffordshire University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308911.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Ma, X. "Computer simulation studies of automatic and flexible assembly systems." Thesis, University of Bradford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376688.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Tsai, Jya-Jang. "Toward automatic parallelization of discrete event simulation programs." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/8302.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Arroyo, Rubio Fernando. "A SIMULATION ENVIRONMENT FOR AUTOMATIC NIGHT DRIVING AND VISUAL CONTROL." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-14562.

Full text

Abstract:

This project consists on developing an automatic night driving system in a simulation environment. The simulator I have used is TORCS. TORCS is an Open Source car racing simulator written in C++. It is used as an ordinary car racing game, as a IA racing game and as a research platform. The goal of this thesis is to implement an automatic driving system to control the car under night conditions using computer vision. A camera is implemented inside the vehicle and it will detect the reflective light-markers placed along the roadside. The car is oriented only with the lights the camera can see.

APA, Harvard, Vancouver, ISO, and other styles

33

Axling, Erik. "Automatic Generation of Simulation Models from Designs." Thesis, Linköping University, Department of Computer and Information Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10409.

Full text

Abstract:

When working with embedded systems, secure and fast applications are desired. To achieve this the applications needs to be analyzed and optimized so that they will not be deadlocked or communicate inefficiently. For this purpose an analysis program that can track communications, deadlocks and response times is needed. Operating System Embedded, OSE, is a wide spread real-time operating system that is used in embedded systems. OSE-applications are excellent candidates for analysis and there exists such a tool, VirtualTime, for that purpose. To analyze an OSE-application a model needs to be written that VirtualTime can analyze. This takes up time and effort as the models can require a lot of work to write.

In this thesis we have investigated and implemented a prototype that translates OSE-application code into VirtualTime simulation model code. We used the transformation tool TXL to translate communication and timing behaviors. In the translation one needs to preserve the communication and timing behavior and throw away other unnecessary code in the OSE-application. This complicates the translation and sophisticated methods like backward slicing might be necessary. A proposed method in this thesis could help with the problem.

APA, Harvard, Vancouver, ISO, and other styles

34

Aronsson, Peter. "Automatic Parallelization of Simulation Code from Equation Based Simulation Languages." Licentiate thesis, Linköping University, Linköping University, PELAB - Programming Environment Laboratory, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5720.

Full text

Abstract:

Modern state-of-the-art equation based object oriented modeling languages such as Modelica have enabled easy modeling of large and complex physical systems. When such complex models are to be simulated, simulation tools typically perform a number of optimizations on the underlying set of equations in the modeled system, with the goal of gaining better simulation performance by decreasing the equation system size and complexity. The tools then typically generate efficient code to obtain fast execution of the simulations. However, with increasing complexity of modeled systems the number of equations and variables are increasing. Therefore, to be able to simulate these large complex systems in an efficient way parallel computing can be exploited.

This thesis presents the work of building an automatic parallelization tool that produces an efficient parallel version of the simulation code by building a data dependency graph (task graph) from the simulation code and applying efficient scheduling and clustering algorithms on the task graph. Various scheduling and clustering algorithms, adapted for the requirements from this type of simulation code, have been implemented and evaluated. The scheduling and clustering algorithms presented and evaluated can also be used for functional dataflow languages in general, since the algorithms work on a task graph with dataflow edges between nodes.

Results are given in form of speedup measurements and task graph statistics produced by the tool. The conclusion drawn is that some of the algorithms investigated and adapted in this work give reasonable measured speedup results for some specific Modelica models, e.g. a model of a thermofluid pipe gave a speedup of about 2.5 on 8 processors in a PC-cluster. However, future work lies in finding a good algorithm that works well in general.

Report code: LiU-Tek-Lic-2002:06.

APA, Harvard, Vancouver, ISO, and other styles

35

Aronsson, Peter. "Automatic Parallelization of Equation-Based Simulation Programs." Doctoral thesis, Linköping : Department of Computer and Information Science, Linköping University, 2006. http://www.bibl.liu.se/liupubl/disp/disp2006/tek1022s.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Yao, Mingdong. "Development of automatic vehicle headway control law and a simulation tool." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-01242009-063351/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Hart, John K. "Automatic control program creation using concurrent Evolutionary Computing." Thesis, Bournemouth University, 2004. http://eprints.bournemouth.ac.uk/394/.

Full text

Abstract:

Over the past decade, Genetic Programming (GP) has been the subject of a significant amount of research, but this has resulted in the solution of few complex real -world problems. In this work, I propose that, for some relatively simple, non safety -critical embedded control applications, GP can be used as a practical alternative to software developed by humans. Embedded control software has become a branch of software engineering with distinct temporal, interface and resource constraints and requirements. This results in a characteristic software structure, and by examining this, the effective decomposition of an overall problem into a number of smaller, simpler problems is performed. It is this type of problem amelioration that is suggested as a method whereby certain real -world problems may be rendered into a soluble form suitable for GP. In the course of this research, the body of published GP literature was examined and the most important changes to the original GP technique of Koza are noted; particular focus is made upon GP techniques involving an element of concurrency -which is central to this work. This search highlighted few applications of GP for the creation of software for complex, real -world problems -this was especially true in the case of multi thread, multi output solutions. To demonstrate this Idea, a concurrent Linear GP (LGP) system was built that creates a multiple input -multiple output solution using a custom low -level evolutionary language set, combining both continuous and Boolean data types. The system uses a multi -tasking model to evolve and execute the required LGP code for each system output using separate populations: Two example problems -a simple fridge controller and a more complex washing machine controller are described, and the problems encountered and overcome during the successful solution of these problems, are detailed. The operation of the complete, evolved washing machine controller is simulated using a graphical LabVIEWapplication. The aim of this research is to propose a general purpose system for the automatic creation of control software for use in a range of problems from the target problem class -without requiring any system tuning: In order to assess the system search performance sensitivity, experiments were performed using various population and LGP string sizes; the experimental data collected was also used to examine the utility of abandoning stalled searches and restarting. This work is significant because it identifies a realistic application of GP that can ease the burden of finite human software design resources, whilst capitalising on accelerating computing potential.

APA, Harvard, Vancouver, ISO, and other styles

38

Sevinc, Suleyman. "Automatic simplification of models in a hierarchical, modular discrete event simulation environment." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184409.

Full text

Abstract:

This research is concerned with the simplification of discrete event simulation models. Specifically, the necessary concepts and tools are investigated for the automatic generation of simplified versions of a discrete event model. The simplification process developed utilizes observations of model behavior. It is based on Zeigler's DEVS formalism developed in his book "Multifacetted Modelling and Discrete Event Simulation". Therefore, the simplified models that are generated adhere to all the canons of this formalism. The implementation is designed as an extension to DEVS-Scheme, a hierarchical modular discrete event modelling and simulation environment. It consists of two layers: the lower layer observes the model behavior and the higher layer generates the code from the observation data obtained at the lower layer. The resulting system allows one to generate simplified models at any level of the model structure hierarchy. A local area network model base is developed and used to demonstrate the validity and complexity reduction of the simplified models relative to the models from which they are extracted.

APA, Harvard, Vancouver, ISO, and other styles

39

Felix, Kleber Gonçalves. "Classificação automática de falhas em arquitetura orientada a serviços." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2822.

Full text

Abstract:

Uma arquitetura distribuída é composta de diversos sistemas que trocam mensagens entre si. Falhas na integração destes sistemas podem ocorrer, exigindo uma investigação detalhada dos profissionais de suporte para encontrar a causa raiz do problema. O processo manual de identificação de falhas é difícil e demorado. Ganhos significativos podem ser obtidos através da automação do processo de classificação de falhas. Este trabalho tem por objetivo apresentar um método para auxílio no processo de diagnóstico de falhas, classificando automaticamente as falhas geradas em uma arquitetura orientada a serviços. Este método, denominado SOAFaultControl, se beneficia de arquiteturas distribuídas que adotam SOA e um Enterprise Service Bus (ESB). Utilizando-se de técnicas de aprendizado de máquina, foi possível estabelecer um modelo para classificação de falhas em categorias preestabelecidas. Para alcançar o objetivo deste trabalho foi necessário testar e avaliar os seguintes algoritmos de aprendizagem de máquina: Support Vector Machine, Naive Bayes e AdaBoost. Como resultado, o algoritmo Support Vector Machine obteve melhor desempenho nas métricas: acurácia, precisão, revocação e F1.
A distributed architecture is composed of many systems that exchange messages between each other. Faults in the integration of these systems may occur and they required a detailed investigation of support professionals to identifying the root cause of the problem. The manual process to identify causes of failure is difficult and time-consuming. Significant efficiency gains can be achieved by automating the faults classification process. This work presents a method to support the automated fault diagnostic process, automatically classifying faults generated in a Service Oriented Architecture (SOA). This method denominated SOAFaultControl, may be executed in a distributed architecture that adote SOA and an Enterprise Service Bus (ESB). Using machine learning techniques, was possible build a model to classify fault messages captured in a SOA environment, in pre-established classes. To achieve the objectives of this work it was necessary to test the following machine learning algorithms: Support Vector Machine, Naive Bayes, and AdaBoost. Results show that Support Vector Machine algorithm achieved better performance in the following metrics: precision, accuracy, recall, and F1.

APA, Harvard, Vancouver, ISO, and other styles

40

Hu, Wenshan. "Design of networked control systems and global Web-based control laboratory." Thesis, University of South Wales, 2008. https://pure.southwales.ac.uk/en/studentthesis/design-of-networked-control-systems-and-global-webbased-control-laboratory(0c8a2649-120a-494f-a887-defcaceed570).html.

Full text

Abstract:

This thesis mainly focuses on two Internet based control applications. One is a networked control system (NCS) where the control loop is closed through the network. The other is the Networked Control System Laboratory (NCSLab) which is a global web based remote experimentation platform. The contribution in the first part of the thesis relates to the networked predictive control (NPC) which was first introduced by Liu et al. (2004). In this method, the controller uses the model predictive approach to predict a future control sequence and send it to the plant in a network packet. The plant side receives this packet and then determine the appropriate control signal to apply to the actuator according to the time delay measurement. This method is innovative and works well in theory, but it has two deficiencies in practical applications. The first deficiency is that it needs synchronization between the controller and plant side to measure the individual forward and feedback channel time delays and this is very hard to achieve on the Internet. In this thesis, a round-trip NPC is proposed in which the predictive calculations and signal selections are based on the round-trip delay. The measurement of the round-tip delay is achieved using the plant side clock only, so that the need for synchronization is avoided. The second deficiency is that the mathematical model has to be accurately known. Otherwise the accuracy of the predictive calculation is affected, which may result in a degraded control performance. An event-driven NPC scheme is introduced to solve this problem. In this scheme, the selection of the appropriate control signal is not based on the time delay measurement but on the previous system output. This method can compensate for the effect of model uncertainty, which has been verified by both simulations and real-time experiments. Some experiments carried out on other NPC schemes are also reported on in this thesis. They are the NPC in state-space form and nonlinear NPC. These methods expand the use of NPC methodology. The second part of the thesis describes the design and implementation of the Networked Control System Laboratory. The NCSLab is based in the University of Glamorgan but its test rigs are diversely located in four Institutions from both the UK and China. In order to manage these test rigs from different places, a four layer structure (Central Server/Regional Server/Sub-Server/Test Rig) is adopted. The four layers are integrated into one system via the Internet. In order to deliver the remote experimentation to the users, a web-based user interface is designed. It provides great flexibility to the users such as remote monitoring, remote tuning and remote control algorithms. The implementation of the user interface (UI) heavily adopts the AJAX technology, so the remote experiments can be conducted inside the web browsers without installing special plug-ins. In order to show how the NCSLab works, two examples are given in the thesis.

APA, Harvard, Vancouver, ISO, and other styles

41

Furmanik, Olga, and Alireza Famili. "Control system integration in ADAMS : With emphasis on hauler Automatic Traction Control system." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-45957.

Full text

Abstract:

The thesis investigates control system integration in ADAMS and the thesis presents appropriate knowledge related to the topic as multi body system, acting forces between road and wheels, equation of motion regarding to the haulers, traction control system and differential locks. The emphasis of the thesis is to implement and test the automatic traction control (ATC) for the hauler into ADAMS and Simulink models. The ATC models are based on certain requirements provided by Volvo Construction Equipment. As expected, results indicate that the ATC model operates during simulation for various road conditions. Nevertheless, the ATC model includes a few defects which are observed in results. The significant achievement of the thesis is a great collaboration between ADAMS and Simulink model.

APA, Harvard, Vancouver, ISO, and other styles

42

Wajirakumara, Akila. "Simulation of Precise Automatic Radio Frequency GroundStation Tracking For S-Band Satellites." Thesis, Luleå tekniska universitet, Rymdteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-83988.

Full text

Abstract:

Satellites are often known for possessing invariable motion causing its apparent position to drift in the sky from the perspective of a ground station. If these irregular drifts are not compensated, the performance of the communication link would be greatly affected. Hence, the satellite motion has to be tracked by the ground station antenna. Arctic Space Technologies is a company based in northern Sweden that focuses on highly reliable and secure satellite data handling solutions; main with S-Band satellites in the Low Earth Orbit (LEO). This thesis consolidates a comprehensive research to implement a robust approach for ground stations to establish a secure connection for optimum satellite communication performance. The implementation will be conducted in the form of a software simulation using MATLAB and SIMULINK. The system proposed in this thesis relies on Two Line Elements (TLE) to obtain the parameters for the calculation of the orbital motion of the satellites and providing the azimuth and elevation angles for the antenna to point towards. However, although TLE data are fairly accurate; LEO satellites have a very small time period passing over a ground station for signals to be received and thus it is vital to ensure maximum signal strength is received for optimum performance in satellite communication. In order to do so, a Kalman filter is incorporated to reduce the antenna’s pointing error by adjusting the estimated trajectory in real time and manoeuvre the ground station accordingly. This thesis uncovers through a theoretical review and simulation that accumulates and ensures the investigation of the primary data from the TLE; the main elements affecting the current situation and rectifying them to a certain extent using control systems. It furnishes with guidelines on how Radio Frequency (RF) signals from S-Band LEO satellites can be effectively communicated through a parabolic reflector as a ground station.

APA, Harvard, Vancouver, ISO, and other styles

43

Natarajan, Sripriya 1978. "Automatic gain control for a small portable ultrasound device." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/16767.

Full text

Abstract:

Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
Includes bibliographical references (leaves 116-117).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
by Sripriya Natarajan.
M.Eng.

APA, Harvard, Vancouver, ISO, and other styles

44

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

45

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

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

46

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

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

47

Gebremedhin, Mahder. "Automatic and Explicit Parallelization Approaches for Mathematical Simulation Models." Licentiate thesis, Linköpings universitet, Programvara och system, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-117346.

Full text

Abstract:

The move from single core and processor systems to multi-core and many-processors systemscomes with the requirement of implementing computations in a way that can utilizethese multiple units eciently. This task of writing ecient multi-threaded algorithmswill not be possible with out improving programming languages and compilers to providethe mechanisms to do so. Computer aided mathematical modeling and simulationis one of the most computationally intensive areas of computer science. Even simpli-ed models of physical systems can impose a considerable amount of computational loadon the processors at hand. Being able to take advantage of the potential computationpower provided by multi-core systems is vital in this area of application. This thesis triesto address how we can take advantage of the potential computation power provided bythese modern processors to improve the performance of simulations. The work presentsimprovements for the Modelica modeling language and the OpenModelica compiler. Two approaches of utilizing the computational power provided by modern multi-corearchitectures are presented in this thesis: Automatic and Explicit parallelization. Therst approach presents the process of extracting and utilizing potential parallelism fromequation systems in an automatic way with out any need for extra eort from the modelers/programmers side. The thesis explains improvements made to the OpenModelicacompiler and presents the accompanying task systems library for ecient representation,clustering, scheduling proling and executing complex equation/task systems with heavydependencies. The Explicit parallelization approach explains the process of utilizing parallelismwith the help of the modeler or programmer. New programming constructs havebeen introduced to the Modelica language in order to enable modelers write parallelizedcode. the OpenModelica compiler has been improved accordingly to recognize and utilizethe information from this new algorithmic constructs and generate parallel code toimprove the performance of computations.

The series name Linköping Studies in Science and Technology Licentiate Thesis is incorrect. The correct series name is Linköping Studies in Science and Technology Thesis.

APA, Harvard, Vancouver, ISO, and other styles

48

Lundvall, Håkan. "Automatic Parallelization using Pipelining for Equation-Based Simulation Languages." Licentiate thesis, Linköping University, Linköping University, PELAB - Programming Environment Laboratory, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12504.

Full text

Abstract:

During the most recent decades modern equation-based object-oriented modeling and simulation languages, such as Modelica, have become available. This has made it easier to build complex and more detailed models for use in simulation. To be able to simulate such large and complex systems it is sometimes not enough to rely on the ability of a compiler to optimize the simulation code and reduce the size of the underlying set of equations to speed up the simulation on a single processor. Instead we must look for ways to utilize the increasing number of processing units available in modern computers. However to gain any increased performance from a parallel computer the simulation program must be expressed in a way that exposes the potential parallelism to the computer. Doing this manually is not a simple task and most modelers are not experts in parallel computing. Therefore it is very appealing to let the compiler parallelize the simulation code automatically. This thesis investigates techniques of using automatic translation of models in typical equation based languages, such as Modelica, into parallel simulation code that enable high utilization of available processors in a parallel computer. The two main ideas investigated here are the following: first, to apply parallelization simultaneously to both the system equations and the numerical solver, and secondly. to use software pipelining to further reduce the time processors are kept waiting for the results of other processors. Prototype implementations of the investigated techniques have been developed as a part of the OpenModelica open source compiler for Modelica. The prototype has been used to evaluate the parallelization techniques by measuring the execution time of test models on a few parallel archtectures and to compare the results to sequential code as well as to the results achieved in earlier work. A measured speedup of 6.1 on eight processors on a shared memory machine has been reached. It still remains to evaluate the methods for a wider range of test models and parallel architectures.

APA, Harvard, Vancouver, ISO, and other styles

49

Lu, Roberto Francisco-Yi. "Implementation of a remote computer controlled automatic guided vehicle /." This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-10242009-020053/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Olsson, Markus. "Simulation Comparison of Auto-Tuning Methods for PID Control." Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11106.

Full text

Abstract:

Auto-tuning has become an important function in distributed control systems (DCS) and is especially appreciated in large industries that can have hundreds of controllers. In the DCS 800xA manufactured by ABB, there is an auto-tuning method implemented based on a relay experiment to determine the ultimate gain and the ultimate period, with which the PID parameters are obtained using the modified Ziegler-Nichols tuning rules. The tuning procedure can then proceed with a step identification experiment to get additional parameters for kappa-tau tuning. In the previous DCS, called Advant, there was another auto-tuning approach implemented. This method was based on dominant pole design, which included an identification of the process. The purpose of this thesis is to compare these auto-tuning methods, to investigate if the dominant pole placement method should be migrated to the 800xA system.

Automatisk trimning har blivit en viktig funktion i distribuerade styrsystem (DCS och är speciellt av intresse för stora industrier som kan ha ﬂera hundra regulatorer. Den automatiska trimningen som idag är implementerad i ABB:s DCS 800xA är baserad på ett reläexperiment för att bestämma den ultimata förstärkningen och den ultimata periodtiden. Modiﬁerade Ziegler-Nichols trimningsregler används sedan för att bestämma PID parametrarna. Vidare kan trimningen fortsätta med ett stegsvars-experiment för att erhålla ytterliggare parametrar och trimma med kappa-tau metoden. Den automatiska trimningsmetoden som var implementerad i tidigare DCS, Advant, var baserad på dominant polplacering med identiﬁering av processen. Syftet med detta examensarbete är att jämföra dessa automatiska trimningsmetoder för att undersöka om den tidigare trimningsmetoden baserad på dominant polplacering ska implementeras i 800xA systemet.

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Automatic control Computer simulation'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles