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Dissertations / Theses on the topic 'Control'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Godoy, Rodrigo Juliani Corrêa de. "Plantwide control: a review and proposal of an augmented hierarchical plantwide control design technique." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-07112017-140120/.

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The problem of designing control systems for entire plants is studied. A review of previous works, available techniques and current research challenges is presented, followed by the description of some theoretical tools to improve plantwide control, including the proposal of an augmented lexicographic multi-objective optimization procedure. With these, an augmented hierarchical plantwide control design technique and an optimal multi-objective technique for integrated control structure selection and controller tuning are proposed. The main contributions of these proposed techniques are the incl

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2

Maslovskaya, Sofya. "Inverse Optimal Control : theoretical study." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLY013/document.

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Cette thèse s'insère dans un projet plus vaste, dont le but est de s'attaquer aux fondements mathématiques du problème inverse en contrôle optimal afin de dégager une méthodologie générale utilisable en neurophysiologie. Les deux questions essentielles sont : (a) l'unicité d'un coût pour une synthèse optimale donnée (injectivité); (b) la reconstruction du coût à partir de la synthèse. Pour des classes de coût générales, le problème apparaît très difficile même avec une dynamique triviale. On a donc attaqué l'injectivité pour des classes de problèmes spéciales : avec un coût quadratique, la dyn

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3

Maslovskaya, Sofya. "Inverse Optimal Control : theoretical study." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLY013.

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Cette thèse s'insère dans un projet plus vaste, dont le but est de s'attaquer aux fondements mathématiques du problème inverse en contrôle optimal afin de dégager une méthodologie générale utilisable en neurophysiologie. Les deux questions essentielles sont : (a) l'unicité d'un coût pour une synthèse optimale donnée (injectivité); (b) la reconstruction du coût à partir de la synthèse. Pour des classes de coût générales, le problème apparaît très difficile même avec une dynamique triviale. On a donc attaqué l'injectivité pour des classes de problèmes spéciales : avec un coût quadratique, la dyn

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4

Liu, Xiaolei. "Sample Size Calculations in Matched Case-Control Studies and Unmatched Case-Control Studies with Controls Contaminated." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1221754897.

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5

Al-Battal, Nader. "Flow control for loads control." Thesis, University of Bath, 2019. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767607.

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During gust encounters and turbulence aircraft are subject to extreme loads that dictate the structural requirements. Amelioration of these loads would allow reduced structural weight and therefore greater efficiency. Flow control is used for controlling the extreme loads at the fluid-structure interface. Two versions of the jet flap, normal and upstream blowing from the upper surface are studied under steady state conditions to illustrate the effectiveness of these devices at mitigating lift loads. The upstream blowing jet flap is further investigated through periodic and transient activation

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6

Favaro, Juliana. "Controle preditivo aplicado à planta piloto de neutralização de pH." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-16072013-170810/.

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Uma das técnicas de controle avançado que vem ganhando destaque no cenário econômico e ecológico, focando maior sustentabilidade e a otimização dos processos, é o controle preditivo, o qual já vem sendo aplicado em indústrias químicas e petroquímicas. Esta dissertação trata do desenvolvimento de um controle preditivo aplicado a uma planta piloto de neutralização de pH, presente no Laboratório de Controle de Processos Industriais da Escola Politécnica da Universidade de São Paulo. O desenvolvimento do projeto pode ser dividido em quatro etapas: implementação das malhas de controle regulatório,

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7

Zanella, Júnior Aldo. "Experimentações práticas e simuladas de controle preditivo generalizado - GPC." Universidade do Estado de Santa Catarina, 2015. http://tede.udesc.br/handle/handle/2084.

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Made available in DSpace on 2016-12-12T20:27:38Z (GMT). No. of bitstreams: 1 Aldo Zanella Junior.pdf: 3746857 bytes, checksum: 7ff548689a89fd8090402ad4891a23c1 (MD5) Previous issue date: 2015-07-09<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work introduces the report of performed studies in order to evaluate the applicability of generalized predictive control (GPC) to several plants. The main goal is to analyze the GPC performance in processes with different features, analyzing the influence of its tuning parameters. The study is justified by the fact that GPC pre

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8

Mirandola, André Luís de Aguiar. "Desenvolvimento de controladores de forças generalizadas em manipuladores industriais." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-29012016-122518/.

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Esta dissertação estuda a otimização da capacidade de interação de manipuladores robôs com o meio externo através do controle das forças e torques envolvidas no contato. Os modelos adotados para as análises levam em consideração a interação entre a extremidade do manipulador e uma superfície. Neste trabalho, são investigadas diferentes metodologias para controle de forças, assim como as vantagens e desvantagens de cada método estudado para comparar e desenvolver um controle adequado das forças de contato. Devido às divergências encontradas na literatura, foram implementadas experimentalmente d

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9

Cadwell, John Andres Jr. "Control of Longitudinal Pitch Rate as Aircraft Center of Gravity Changes." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/426.

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In order for an aircraft to remain in stable flight, the center of gravity (CG) of an aircraft must be located in front of the center of lift (CL). As the center of gravity moves rearward, pitch stability decreases and the sensitivity to control input increases. This increase in sensitivity is known as pitch gain variance. Minimizing the pitch gain variance results in an aircraft with consistent handling characteristics across a broad range of center of gravity locations. This thesis focuses on the development and testing of an open loop computer simulation model and a closed loop control sy

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10

Renfrew, David T. "TRAFFIC SIGNAL CONTROL WITH ANT COLONY OPTIMIZATION." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/190.

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Traffic signal control is an effective way to improve the efficiency of traffic networks and reduce users’ delays. Ant Colony Optimization (ACO) is a metaheuristic based on the behavior of ant colonies searching for food. ACO has successfully been used to solve many NP-hard combinatorial optimization problems and its stochastic and decentralized nature fits well with traffic flow networks. This thesis investigates the application of ACO to minimize user delay at traffic intersections. Computer simulation results show that this new approach outperforms conventional fully actuated control under

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11

Peng, Youbin. "On adaptive control :Pole-zero placement control and generalized predictive control." Doctoral thesis, Universite Libre de Bruxelles, 1991. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/213050.

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12

Porfirio, Carlos Roberto. "Implantação de um controlador multimodelos em uma coluna depropanizadora industrial." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-14122001-123029/.

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As colunas depropanizadoras existentes nas refinarias de petróleo têm como função a separação entre as correntes de propano e butano. O objetivo de controle nestas colunas é a especificação de um teor máximo de iso-butano e mais pesados (C4 +) na corrente de propano e do teor máximo de propano e mais leves (C3 -) na corrente de butano. Controladores multivariáveis tradicionais, que normalmente são implementados nas colunas depropanizadoras, apresentam grande dificuldade para manter os produtos dentro de suas especificações, isto se deve ao fato de que este processo apresenta um comportamento b

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13

Barão, Renato Casali. "Algoritmos de controle ótimo quadrático com restrições." Universidade de São Paulo, 1997. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-22032004-194309/.

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O objetivo do trabalho é apresentar dois algoritmos para a solução de problemas de controle ótimo quadrático robusto com restrições, dentro de um contexto de controladores preditivos (MPC do inglês Model Predictive Control). Inicialmente apresentamos uma breve introdução aos algoritmos MPC, com ênfase na abordagem do controlador linear quadrático. Em seguida são apresentados os dois algoritmos de interesse, que utilizam técnicas de otimização LMI. Dessa forma as restrições e as incertezas podem ser colocadas em formas computacionalmente tratáveis. Por fim são realizadas simulações e comparaçõe

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14

SILJEDAHL, JENNIE. "Control Me as I Control You." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-20123.

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It started with an illustration and a painting. Similarities between themthat made me think of beauty and ugliness. I´ve questioned the subjectfrom a subjective point of view. Through materials, colours and constructionmethods I´ve reached an expression that is a balance between theugly and the beautiful, the crazy and the controlled. The characters arefigures part of another world.<br>Program: Modedesignutbildningen

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15

Neves, Gabriel Pereira das. "Modeling, construction and control of a self-balancing unicycle." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-07112017-082249/.

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In this work, a unicycle system with reaction wheel is presented, considering the construction, the modeling, the design and test of the controllers. Firstly, a mechanical model considering a tridimensional computer aided design (3D CAD) is built in order to assist the construction and, after that, the modeling using the Lagrange method. In this work, linear controllers are designed and, therefore, the linearization of the system is done by the Jacobian, that is, assuming small variations around the equilibrium point. In this situation, there is no coupling between the pitch and the roll angle

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16

Yoshida, Luciana [UNESP]. "Atividade patogênica dos fungos Metarhizium anisopliae, Beauveria bassiana e Paecilomyces fumosoroseus para Chrysomya puloria (Wiedemann, 1830) (Diptera: Calliphoridae)." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/94933.

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Made available in DSpace on 2014-06-11T19:27:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-07-10Bitstream added on 2014-06-13T18:56:04Z : No. of bitstreams: 1 yoshida_l_me_jabo.pdf: 663799 bytes, checksum: 4dc9e1d64b26d27a609814b1eb9e7c39 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O presente estudo investigou, em condições de laboratório, a atividade patogênica de diferentes isolados dos fungos Metarhizium anisopliae, Beauveria bassiana e Paecilomyces fumosoroseus, aplicados nas concentrações de 1 x1 06 e 1 x1 08 conídios/mL nos estágios de ov

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Nais, Juliana [UNESP]. "Infestação de Spodoptera frugiperda e Helicoverpa zea (Lepidoptera: Noctuidae) em híbridos comerciais de milho (Zea mays L.)." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/102279.

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Made available in DSpace on 2014-06-11T19:31:46Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-02-28Bitstream added on 2014-06-13T20:22:55Z : No. of bitstreams: 1 nais_j_dr_jabo.pdf: 297704 bytes, checksum: 58a7b62580296b98718799a8194e3ca1 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O milho é uma das plantas domesticadas pelo homem mais antigas do mundo e sua produção se torna ameaçada diante do ataque de pragas. Dentre elas destacam-se a lagarta-do-cartucho Spodoptera frugiper

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18

Moreira, Fernando Jose de Oliveira. "Um controlador H 'infinito' alfa de Banda limitada para o controle ativo de vibração estrutural." [s.n.], 1998. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263222.

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Orientador: Jose Roberto de França Arruda<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-07-24T09:38:32Z (GMT). No. of bitstreams: 1 Moreira_FernandoJosedeOliveira_D.pdf: 15667292 bytes, checksum: b9be95fa70780c1440ed7671ea43a6dd (MD5) Previous issue date: 1998<br>Resumo: Neste trabalho é apresentada uma metodologia para controle ativo de vibração. O objetivo é amortecer modos de vibração de uma estrutura na região de média freqüência. A técnica empregada envolve controle por realimentação e se aplica tanto a prob

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19

Teodoro, Ricardo Gouveia. "Controle da posição angular da perna de voluntários hígidos e com lesão medular utilizando estimulação elétrica funcional e técnicas de controle robusto e chaveado." Ilha Solteira, 2018. http://hdl.handle.net/11449/157347.

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Orientador: Aparecido Augusto de Carvalho<br>Resumo: A Estimulação Elétrica Funcional tem sido utilizada para auxiliar no restabelecimento de funções motoras em paraplégicos. Neste trabalho é proposto um procedimento experimental para identificar as incertezas politópicas de um modelo dinâmico do movimento do membro inferior, produzido por estimulação elétrica aplicada no quadríceps. Foram realizadas comparações entre controle em malha aberta e dois controladores em malha fechada. O projeto dos controladores foi baseado em desigualdades matriciais lineares (LMIs). Os resultados experimentais f

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20

Furtado, Guilherme Phillips. "Formulation of impedance control strategy as an optimal control problem." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-05022019-153033/.

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A formulation of impedance control for redundant manipulators is developed as a particular case of an optimal control problem. This formulation allows the planning and design of an impedance controller that benets from the stability and eficiency of an optimal controller. Moreover, to circumvent the high computational costs of computing an optimal controller, a sub-optimal feedback controller based on the state-dependent Ricatti equation (SDRE) approach is developed. This approach is then compared with the quadratic programming (QP) control formulation, commonly used to resolve redundancy of r

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21

Toriumi, Fabio Yukio. "Controle digital de uma planta giroscópio." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-21122016-090720/.

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Esta dissertação apresenta a modelagem matemática de um giroscópio de controle de momento (CMG) e aplica técnicas de controle digital para o controle de atitude dessa planta. CMGs são atuadores importantes para o controle de atitude de corpos no espaço, tais como satélites e veículos espaciais. Desenvolve-se a modelagem da planta por meio da mecânica Lagrangiana e estudam-se técnicas específicas de controle PID (proporcional-integral-derivativo) e LQR (linear-quadratic regulator ) digitais para aplicação em sistemas com a planta nas configurações desacoplada e acopladas de fase mínima e não-mí

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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.

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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

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23

Wang, Liren. "An approach to neuro-fuzzy feedback control in statistical process control." Thesis, University of South Wales, 2001. https://pure.southwales.ac.uk/en/studentthesis/an-approach-to-neurofuzzy-feedback-control-in-statistical-process-control(7d9c736f-e85d-4873-a6bb-9bcea107d371).html.

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It is a difficult challenge to develop a feedback control system for Statistical Process Control (SPC) because there is no effective method that can be used to calculate the accurate magnitude of feedback control actions in traditional SPC. Suitable feedback adjustments are generated from the experiences of process engineers. This drawback means that the SPC technique can not be directly applied in an automatic system. This thesis is concerned with Fuzzy Sets and Fuzzy Logic applied to the uncertainty of relationships between the SPC (early stage) alarms and SPC implementation. Based on a numb

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Park, Song Won. "Aplicação de controladores geométricos não-lineares em processos químicos." Universidade de São Paulo, 1995. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-10102017-092846/.

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Para abordagem do controle não-linear geométrico, a síntese do controle e elaborada diretamente a partir da descrição do processo com a dinâmica não-linear em espaço de estados. O presente trabalho trata da aplicação dos principais conceitos e formalismos do controle não-linear geométrico para os processos multivariaveis típicos da engenharia química: o controle não-linear continuo da coluna de destilação e o controle não-linear discreto da unidade de craqueamento catalítico em leito fluidizado. A síntese e o projeto do controlador não-linear são enfocados separadamente. O projeto do controlad

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Zhao, Yun-Bo. "Packet-Based Control for Networked Control Systems." Thesis, University of South Wales, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490204.

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Networked control systems (NCSs) are such control systems where the control loop is closed via some form of communication networks. These control systems are widely applicable in remote and distributed control applications. The inserted network however presents great challenges to conventional control theory as far as the design and analysis of NCSs are concerned. These challenges are caused primarily by the communication constraints in NCSs, e.g., network-induced delay, data packet dropout, data packet disorder, network access constraint, etc., which significantly degrade the system performan

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Ma, Xin. "Adaptive extremum control and wind turbine control /." Online version, 1997. http://bibpurl.oclc.org/web/24097.

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Sabri, Dina O. "Process control using an optomux control board." Virtual Press, 1987. http://liblink.bsu.edu/uhtbin/catkey/484759.

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In this thesis process control concepts were used to develop software that could be adapted to a real world situation. The software was used to control a simple temperature regulating experiment. This experiment was used to demonstrate the use of OPTOMUX analog and digital input/output devices in controlling a process. The goal of this experiment was to use the input/output devices in controlling the temperature of the box within specified tolerances for a designated period of time. To accomplish optimal use of equipment and optimal control, a mathematical model was derived to predict the beha

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Zhao, Shiyu. "Nonparametric robust control methods for powertrain control." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.548802.

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Dextre, Flores José Carlos, and Rivas Raúl Sergio Del Pozo. "¿Control de gestión o gestión de control?" Pontificia Universidad Católica del Perú, 2012. http://repositorio.pucp.edu.pe/index/handle/123456789/114761.

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The attempt to answer the title of this article frames the analysis of the concept of control as a key role of the management, which any entity applies in pursuit of its institutional fulfillment. The control intervention in the development of the activities carried out by organizations to achieve the planned objectives of economic, social or political order constitutes its core business, as it seeks to ensure that those activities—operations and processes—are conducted safely, continuous and reliable. This applies both to those who constitute the organization and those who have expectations o

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Myers, William Osborne V. "Daily Control: Immigrant Experiences with Social Control." Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent161866874718439.

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Kirchner, William. "Anthropomimetic Control Synthesis: Adaptive Vehicle Traction Control." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/26620.

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Human expert drivers have the unique ability to build complex perceptive models using correlated sensory inputs and outputs. In the case of longitudinal vehicle traction, this work will show a direct correlation in longitudinal acceleration to throttle input in a controlled laboratory environment. In fact, human experts have the ability to control a vehicle at or near the performance limits, with respect to vehicle traction, without direct knowledge of the vehicle states; speed, slip or tractive force. Traditional algorithms such as PID, full state feedback, and even sliding mode control have

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Khairallah, Ousama Said. "Robotics Control using Active Disturbance Rejection Control." Cleveland State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1262832204.

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Chu, C. C., and T. J. Henneberry. "Chemical Control Studies of Silverleaf Whitefly Control." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/210866.

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Chemical control studies for silverleaf whitefly, Bemisia argentifolii Bellows and Perring, control on cotton showed that fenpropathrin-acephate, fenpropathrin-endosulfan, and endosulfan-bifenthrin mixtures gave adequate control and increased cotton yields were obtained as compared within untreated cottons. Pyriproxyfen, applied biweekly or alternated with fenpropathrin-acephate, Nicotiana, and a fenpropathrin-mycotrol mixture also gave effective control.

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Lugão, João Ricardo Lhullier [UNESP]. "Controlador de temperatura para célula de medição de propriedades de líquidos por ultrassom." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/136279.

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Groff, Leonardo Broering. "Controle baseado em eventos para sistemas em tempo discreto." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/143307.

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Este trabalho aborda o problema de controle baseado em eventos para sistemas em tempo discreto, considerando que o sistema possui os dispositivos atuadores e sensores em nós diferentes e separados por uma rede de comunicação. A estratégia baseada em eventos consiste em reduzir a utilização da rede ao transmitir as informações do sensor para o atuador apenas quando um evento é gerado pela violação de um determinado limiar pela função de disparo. Primeiramente, são formuladas condições para a estabilidade de um sistema linear com realimentação estática de estados sob a estratégia proposta, com b

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Gratiere, Ederson. "Proposição e avaliação de estruturas de controle para cristalizadores." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267010.

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Orientadores: Rubens Maciel Filho, Caliane Bastos Borba Costa<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-16T03:17:15Z (GMT). No. of bitstreams: 1 Gratiere_Ederson_M.pdf: 1433987 bytes, checksum: 0ad688b829ff34696ff6b641a96ae000 (MD5) Previous issue date: 2010<br>Resumo: Este trabalho teve como objetivos principais avaliar o comportamento dinâmico de um cristalizador batelada operado por resfriamento, para o caso de estudo da cristalização de ácido adípico, de grande interesse industrial, e propor estru

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Santos, Marcel Merlin dos. "Controle H-infinito em suspensões ativas aplicando técnicas baseadas em desigualdades matriciais lineares." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265006.

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Orientador: Alberto Luiz Serpa<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-16T17:57:08Z (GMT). No. of bitstreams: 1 Santos_MarcelMerlindos_M.pdf: 5016793 bytes, checksum: f37e8e9c24d066f039f997af537b3b4f (MD5) Previous issue date: 2010<br>Resumo: Nesse estudo foram aplicadas as técnicas de controle H1 em modelos de suspensões ativas veiculares. O interesse de controlar o sistema baseado nessa técnica está também no fato de que sua obtenção pode ser feita através da solução de problemas de otimização, s

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Ng, Justin. "Artificial Neural Network-Based Robotic Control." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1846.

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Artificial neural networks (ANNs) are highly-capable alternatives to traditional problem solving schemes due to their ability to solve non-linear systems with a nonalgorithmic approach. The applications of ANNs range from process control to pattern recognition and, with increasing importance, robotics. This paper demonstrates continuous control of a robot using the deep deterministic policy gradients (DDPG) algorithm, an actor-critic reinforcement learning strategy, originally conceived by Google DeepMind. After training, the robot performs controlled locomotion within an enclosed area. The pa

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Villota, Cerna Elizabeth Roxana. "Análisis comparativo del control vibracional por técnicas de control óptimo y control robusto." Universidad Nacional de Ingeniería. Programa Cybertesis PERÚ, 2002. http://cybertesis.uni.edu.pe/uni/2002/villota_ce/html/index-frames.html.

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Melville, Robert. "Re-engineering internal audit : strategy and control, control models and control self assessment." Thesis, City, University of London, 2002. http://openaccess.city.ac.uk/19755/.

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This thesis examines the role of internal auditors in three key areas: strategy, control models and control self assessment. Research findings are based on the results of a survey of a specialist group of professionals with an interest in Control Self Assessment. This group comprises both internal auditors and non-internal auditors. Membership is multinational and a full range of industries is represented. The actual and potential contribution that internal auditors can make to strategy is assessed and evaluated, with particular reference to the Balanced Scorecard. Control models were examined

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D'Amelio, Jeffrey David. "Development of a Digital Controller for Motor Control Experiments in the EE472 Lab." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1339.

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A digital motor controller for student lab use is designed, built, and tested. The controller uses an encoder for position measurement, and an H-bridge to drive the electromechanical plant. A user interface is created to enhance usability of the device. The user interface is able to display key parameters of the control algorithm as well as the state of the system. It is also used to modify the gains and sample rate of the control algorithm. The design of the system is refined, and 10 units are built for the EE472 Digital Controls Lab. The lab manuals for the first 4 experiments are revised to

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Parisi, Aaron Thomas. "An Application of Sliding Mode Control to Model-Based Reinforcement Learning." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2054.

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The state-of-art model-free reinforcement learning algorithms can generate admissible controls for complicated systems with no prior knowledge of the system dynamics, so long as sufficient (oftentimes millions) of samples are available from the environ- ment. On the other hand, model-based reinforcement learning approaches seek to leverage known optimal or robust control to reinforcement learning tasks by mod- elling the system dynamics and applying well established control algorithms to the system model. Sliding-mode controllers are robust to system disturbance and modelling errors, and have

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Agbi, Clarence. "Scalable and Robust Designs of Model - Based Control Strategies for Energy - Efficient Buildings." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/333.

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In the wake of rising energy costs, there is a critical need for sustainable energy management of commercial and residential buildings. Buildings consume approximately 40% of total energy consumed in the US, and current methods to reduce this level of consumption include energy monitoring, smart sensing, and advanced integrated building control. However, the building industry has been slow to replace current PID and rule-based control strategies with more advanced strategies such as model-based building control. This is largely due to the additional cost of accurately modeling the dynamics of

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CINQUERRUI, ALESSANDRO. "Sustainable approaches to control Calonectria diseases in ornamental nursery." Doctoral thesis, Università degli studi di Catania, 2015. http://hdl.handle.net/20.500.11769/490912.

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Le specie appartenenti al genere Calonectria sono importanti patogeni delle piante ornamentali. La lotta chimica per il controllo delle malattie causate da tali patogeni è necessaria, ma allo stato attuale è importante ricercare strategie di controllo alternative alla lotta chimica, che consentano di rispettare le recenti normative europee sull’uso sostenibile dei pesticidi (Dir. 2009/128/EC). Diversi esperimenti sono stati messi in atto per la messa a punto di programmi di lotta integrata (IPM) che consentano un efficace contenimento delle infezioni in vivaio, quali macchie fogliari, marciumi

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Guedes, Luís Roberto Schlemm. "Controle robusto de coluna de destilação de alta pureza." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-09052002-111934/.

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Colunas de destilação de alta pureza são sistemas de difícil controle. Apresentam longo tempo de resposta, comportamento altamente não linear e grande interação entre as variáveis. Os controladores preditivos são muito utilizados para o controle de colunas de destilação. Porém, em colunas de alta pureza, a incorporação de um único modelo linear geralmente acarreta em um controle de fraco desempenho. Isto pois, a representação do processo é deficiente, já que não considera variações nos ganhos e nas dinâmicas, típicas de um comportamento não linear. Estas incertezas podem, inclusive, provocar a

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Uehara, Daniel. "Detecção e quantificação de atrito em válvulas de controle." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-25052009-174853/.

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Este trabalho dedica-se ao estudo de métodos para detecção e quantificação do atrito em válvulas de controle. Tais válvulas são, em geral, o elemento final em malhas de controle de processos industriais. A presença de atrito nessas válvulas pode elevar a variabilidade da malha de controle, causando perdas de qualidade do produto, aumento nas paradas para manutenção e impactos econômicos significativos. Muitos estudos foram realizados visando diagnosticar e medir o atrito. Neste trabalho, serão implementadas algumas técnicas propostas na literatura para detecção e quantificação de atrito em vál

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Ting, Sio Weng. "Advanced control approaches for time-variant system : fuzzy logic control and adaptive inverse control." Thesis, University of Macau, 1997. http://umaclib3.umac.mo/record=b1445630.

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Macfie, Alex. "Semantic role-based access control." Thesis, University of Westminster, 2014. https://westminsterresearch.westminster.ac.uk/item/964y2/semantic-role-based-access-control.

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In this thesis we propose two semantic ontological role-based access control (RBAC) reasoning processes. These processes infer user authorisations according to a set of role permission and denial assignments, together with user role assignments. The first process, SO-RBAC (Semantic Ontological Role-Based Access Control) uses OWL-DL to store the ontology, and SWRL to perform reasoning. It is based mainly on RBAC models previously described using Prolog. This demonstrates the feasibility of writing an RBAC model in OWL and performing reasoning inside it, but is still tied closely to descriptive

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Castro, Allan Gregori de. "Controle preditivo Finite Control-Set aplicado à máquina síncrona com ímã permanente no rotor." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-24042017-104320/.

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Ondulações de torque devido à comutação de fases é apontada como a principal desvantagem do método de controle 6 pulsos convencional do motor síncrono de ímã permanente no rotor com força contra-eletromotriz trapezoidal. Para reduzir essas ondulações, diferentes estratégias de controle vetorial dessa máquina são apresentadas na literatura. Nesse trabalho é proposto e analisado o controle vetorial dessa máquina utilizando uma malha de controle de corrente baseada no Finite Control-Set Model-based Predictive Control (FCS-MPC). Como resultado, a estrutura de controle vetorial proposta é capaz de

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Souza, Edson José Cardoso de. "Controle anti-oscilatório de tempo mínimo para guindaste usando a programação linear." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-21122009-133032/.

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O problema de transferir uma carga ao se movimentar num plano em tempo mínimo e sem oscilação no ponto de descarga, num guindaste portuário tipo pórtico é investigado neste trabalho. Assume-se que a carga esteja inicialmente em repouso na posição vertical no ponto de carga acima do navio e igualmente em repouso no ponto de descarga na moega de alimentação no porto. Assume-se também que o carro do guindaste esteja em repouso em ambos os pontos. Um modelo completo é apresentado para o sistema do guindaste onde as equações dinâmicas não-lineares são linearizadas para ângulos de oscilação pequenos

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