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Mostrando 13-24 de 105 artigos, teses e dissertações.
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13. Nonlinear optimum model following control of flexible aircraft.
This Doctorate Thesis concerns optimum control of flexible aircraft. Models of a conceptual flexible aircraft are developed for control applications. A general model following problem via output feedback is developed and applied to the conceptual aircraft. The models are determined for 3 aircraft variants with increasing flexibility. The aerodynamics of flex
Publicado em: 2010
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14. Controle dinamico de saida para sistemas discretos com saltos markovianos / Dynamic output feedback for discrete-time Markov jump linear systems
Este trabalho tem por objetivo o estudo do projeto de controladores dinâmicos H2 e H? por realimentação de saída para sistemas discretos com parâmetros sujeitos a saltos markovianos. Inicialmente, estudamos o caso de filtragem e propomos diferentes técnicas de projeto para casos especiais relacionados à disponibilidade do estado da cadeia de Markov, t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/06/2009
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15. Controle de movimentos coordenados de robôs móveis quando os robôs assumem a liderança de maneira aleatória / Control of coordinated movements of mobile robots when the robots take the lead in a random
This dissertation proposes a study on the automatic control of dynamic systems to the problem of coordination of mobile robots. The coordinated motions are performed with the robots following a leader, and any robot of the formation can assume the leadership randomly. The robots exchange informations according to a pre-specified communication directed graph
Publicado em: 2009
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16. An approach to design feedback controllers for flight control systems employing the concepts of gain scheduling and optimization.
The role of feedback in the design of aircraft stability and control is becoming increasingly important. The basic reason driving this trend is the necessity to cope with a growing number of more stringent requirements, which are sometimes conflicting. This work presents a design methodology applicable to flight control laws, which can be either a control an
Publicado em: 2009
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17. Controle digital de inversores monofásicos com realimentação de estados internos
This work presents a contribution to the study of PWM sinusoidal inverters. It is presented some voltage output control techniques highlighting the advantages and disadvantages. One technique using two feedback loops and compensation by proportional integral compensators, besides showing a natural short circuit protection, is implemented and evaluated by stu
Publicado em: 2009
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18. Vibration H-infinity control with constrained force signal / Controle H-infinito de vibrações com restrições no esforço de controle
In this work, the H8 control of vibrations problem taking into account the effects of saturation of actuators is studied. Two situations of interest were explored. The first one considers that saturation should be avoided and does not cause damage to the system, even if this situation leads to loss of performance. The second alternative seeks to modify the c
Publicado em: 2009
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19. An analysis of energetic balance of a biogasproducing System in a swine farm: implementation of a computational device / Análise de balanço energético de sistema de produção de biogás em granja de suínos: implementação de aplicativo computacional
The development of swine breeding made evident the need for greater attention to the issue of treatment and destination of swine wastes. Among the alternatives for environmental sanitation, the most advantageous one shows to be the biodigesters, since they add value to the process by means of the by-products generated: biogas, mainly made out of methane and
Publicado em: 2009
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20. Realimentação de saida robusta a partir de controladores dependentes de parametros para sistemas lineares incertos discretos no tempo / Robust output feedback starting from parameter-dependent controllers for discrete-time uncertain linear systems
Esta dissertação trata de um dos mais importantes problemas em aberto na teoria de controle, o projeto de controladores por realimentação estática de saída. A principal contribuição é propor um método para computar controladores robustos estáticos por realimentação de saída para sistemas lineares incertos discretos no tempo, usando um controlad
Publicado em: 2009
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21. CONTRIBUTION TO THE CONTROL OF ELECTRODYNAMIC VIBRATION MACHINES / CONTRIBUIÇÃO AO CONTROLE DE MÁQUINAS DE VIBRAÇÃO ELETRODINÂMICAS
This work presents contributions to the sinusoidal acceleration control of electrodynamic shakers applied in vibration testing. Considering the importance of sine tests to identify critical frequencies of operation and to determine mechanical weakness in the specified performance of specimens, vibration controllers are designed to reproduce the amplitude and
Publicado em: 2009
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22. Controle H-infinito não linear e a equação de Hamilton Jacobi-Isaacs. / Nonlinear H-infinity control and the Hamilton-Jacobi-Isaacs equation.
O objetivo desta tese é investigar aspectos práticos que facilitem a aplicação da teoria de controle H1 não linear em projetos de sistemas de controle. A primeira contribuição deste trabalho é a proposta do uso de funções ponderação com dinâmica no projeto de controladores H1 não lineares. Essas funções são usadas no projeto de controladores
Publicado em: 2008
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23. Comparison of face to face and teleconsultation probe microphone measures / Comparação das medidas com microfone sonda realizadas face a face e via teleconsulta
The efficacy of an internet based teleconsultation for hearing aid probe microphone measures in hearing impaired adults was evaluated. The amplitudes of face to face (F) and remote (R) real ear unaided response (REUR), real ear aided response (REAR) and real ear insertion gain (REIG) were compared. The measurement error for repeated measures of REUR, REAR an
Publicado em: 2008
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24. Afetividade e correção e/ou tratamento de erros de dois professores de e/le da rede pública do DF
This is a qualitative-interpretative research whose objectives are to identify the affective factors that are present in the E/LE (Spanish as Foreign Language) classroom, to verify if the teacher corrects or treats errors and which procedures are employed to make these corrections. We also aim to verify if the affective factors present in the E/LE classroom
Publicado em: 2008