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Nonlinear robust/adaptive controller design for an air-breathing hypersonic vehicle model

Nonlinear robust/adaptive controller design for an air-breat...

引用

AIAA Guidance, Navigation, and control Conference 2007

作者： Fiorentini, L. Serrani, A. Bolender, Michael A. Doman, David B. Collaborative Center of Control Science Ohio State University Columbus OH 43210 United States Air Force Research Laboratory Wright-Patterson AFB OH 45433 United States Department of Electrical and Computer Engineering 2015 Neil Ave. United States AIAA United States AFRL/VACA 2210 Eighth St. United States

ISBN: (纸本)1563479044

This paper presents preliminary results on the design of a nonlinear robust controller for an air-breathing hypersonic vehicle model. To overcome the analytical intractability of a dynamical model derived from first principles, a simplified control-oriented model is used for control design. The control-oriented model retains most of the features of the original model, including non-minimum phase characteristic of the flight-path angle dynamics and strong couplings between the engine and flight dynamics, whereas flexibility effects, included in the simulation model, are regarded as a dynamic perturbation. In adopting reduced-complexity models for controller design, the issue of robustness with respect to model uncertainty must be carefully addressed and included at the design level. Dynamic inversion-based design methods do not lend themselves easily to quantitative robustness analysis, due to the complexity of the inverse model of the plant. In this paper, a nonlinear sequential loop-closure approach is adopted to design a dynamic state-feedback controllers that provide stable tracking of velocity and altitude reference trajectories. The approach considered in this paper utilizes a combination of adaptive and robust design methods based on both classic and recently developed nonlinear design tools. Simulation results indicate that the proposed methodology may constitute a feasible approach towards the development of robust nonlinear controllers that satisfactorily address the issue of model uncertainty for this type of applications.

关键词： Adaptive control systems

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A Hierarchical Face Identification System Based on Facial Components

A Hierarchical Face Identification System Based on Facial Co...

引用

ACS/IEEE International Conference on computer Systems and Applications

作者： Mehrtash T Harandi Majid Nili Ahmadabadi Babak N. Araabi School of cognitive science (SCS) Institute of Studies in Theoretical Physics and Mathematics Tehran Iran Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran Iran

It is generally agreed that faces are not recognized only by utilizing some holistic search among all learned faces, but also through a feature analysis that aimed to specify more important features of each specific face. This paper addresses a novel decision strategy that efficiently uses both holistic and facial component (left eye, right eye, nose and mouth) feature analysis to recognize faces. The proposed algorithm uses the whole face features in the first step of recognition task. If the decision machine fails to assign a class (with high confidence) then the individual facial components are processed and the resulting information are combined with those obtained from the whole face to assign the output. Simulation studies justify the superior performance of the proposed method as compared to that of Eigenface method. Experimental results also show that the proposed system is robust against small errors in facial component extractor.

关键词： Face recognition Humans Facial features Nose Mouth Statistical learning Linear discriminant analysis Principal component analysis Object recognition Vectors

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The Stability Analysis of the Adaptive Fading Extended Kalman Filter

The Stability Analysis of the Adaptive Fading Extended Kalma...

引用

IEEE Conference on control Technology and Applications (CCTA)

作者： Kwang Hoon Kim Jang Gyu Lee Chan Gook Park Gyu In Jee Department of Electronics Engineering Brain Korea 21 Research Group Konkuk University Seoul South Korea School of Electrical Engineering and Computer Science and Automatic Control Research Center Seoul National University Seoul South Korea School of Mechanical and Aerospace Engineering and Institute of Advanced Aerospace Technology Seoul National University Seoul South Korea Department of Electronics Engineering Konkuk University Seoul South Korea

The well-known conventional Kalman filter gives the optimal solution but requires an accurate system model and exact stochastic information. Thus, the Kalman filter with incomplete information may be degraded or even diverged. In a number of practical situations, the system model and the stochastic information are incomplete. To solve this problem, a new adaptive fading Kalman filter (AFKF) using the forgetting factor has recently been proposed. This paper extends the AFKF to nonlinear system models to obtain an adaptive fading extended Kalman filter (AFEKF). The forgetting factor is generated from the ratio between the calculated innovation covariance and the estimated innovation covariance. Based on the analysis result of Reif for the EKF, the stability of the AFEKF is also analyzed.

关键词： Stability analysis Fading Stochastic systems Nonlinear equations Nonlinear systems Information filtering Information filters Adaptive filters control systems Degradation

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Filtering of discrete linear repetitive processes with ∞ and 2-∞ performance

Filtering of discrete linear repetitive processes with ∞ an...

引用

2007 IEEE International Symposium on Circuits and Systems, ISCAS 2007

作者： Ligang, Wu Lam, James Paszke, Wojciech Galkowski, Krzysztof Rogers, Eric Kummert, Anton Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin 150001 China Department of Mechanical Engineering University of Hong Kong Pokfulam Road Hong Kong Hong Kong Institute of Control and Computation Engineering University of Zielona Góra 65-246 Zielona Góra Poland School of Electronics and Computer Science University of Southampton Southampton SO17 IBJ United Kingdom University of Wuppertal Faculty of Electrical Information and Media Engineering Communication Theory

This paper considers the general filtering problem for a distinct class of two-dimensional (2-D) discrete linear systems, i.e. information propagation in two independent directions, known as discrete linear repetitive processes which are of both system-theoretic and applications interest. In particular, new results on the design of filters with guaranteed levels of performance are developed. These take the form of algorithms for the design of an ∞ and 2-∞ dynamic output feedback filter which guarantees that the resulting filtering error process is stable and has prescribed disturbance attenuation performance as measured by ∞ and 2- ∞ norms. © 2007 IEEE.

关键词： Signal filtering and prediction

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Fault-tolerant control of Uncertain Time-delay Discrete-time Systems Using T-S Model

Fault-tolerant Control of Uncertain Time-delay Discrete-time...

引用

IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Le Zhang Yuan-Wei Jing Rong-Zhen Chen Honghai Liu Georgi M. Dimirovski Control Science Institute of the School of Information Science and Engineering Northeastern University Shenyang China Institute of Industrial Research University of Portsmouth Portsmouth UK SS Cyril and Methodius Faculty of Electrical & Computer Engineering University of Skopje Skopje Macedonia Computer Eng. Department Dogus University Istanbul Turkey

The investigated control problem of nonlinear time-delay discrete-time systems is addressed using Takagi-Sugeno model. Parametric uncertainty and time-delay terms are employed in building the Takagi-Sugeno model for the controlled plant for the purpose of close representation of the original plant system. The integrity and robustness are guaranteed for the closed-loop fuzzy system in sense of Lyapunov stability method via fuzzy state observers. Sufficient conditions for the fuzzy system to possess integrity against actuator failures and sensor failures in the closed-loop are derived in terms of linear matrix inequalities under assumption of known bounds on uncertainties. The results for trailer-truck example are used to illustrate the effectiveness of the method.

关键词： Fault tolerant systems Fuzzy systems Takagi-Sugeno model Uncertainty Nonlinear control systems Robust stability Lyapunov method Sufficient conditions Hydraulic actuators Sensor systems

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Global Output-Feedback Stabilization for a Class of Stochastic Non-Minimum-Phase Nonlinear Systems

Global Output-Feedback Stabilization for a Class of Stochast...

引用

IEEE Conference on control Technology and Applications (CCTA)

作者： Shu-Jun Liu Zhong-Ping Jiang Ji-Feng Zhang Laboratory of Systems and Control Academy of Mathematics and Systems Science슠Chinese Academy of Sciences China Department of Electrical and Computer Engineering Polytechnic University Brooklyn NY USA Laboratory of Systems and Control Academy of Mathematics and Chinese Academy of Sciences China

In this paper, the output-feedback stabilization problem is investigated for the first time for a class of stochastic nonlinear systems whose zero dynamics may be unstable. Under the assumption that the inverse dynamics of the system is stochastic input-to-state stabilizable, a stabilizing output-feedback controller is constructively designed by the integrator backstepping method together with a new reduced-order observer design and the technique of changing supply functions. It is shown that, under small-gain type conditions, the resulting closed-loop system is globally asymptotically stable in the probabilistic sense. The obtained results extend the existing methodology from deterministic systems to stochastic systems.

关键词： Stochastic systems Nonlinear systems control systems Nonlinear control systems Backstepping Nonlinear dynamical systems Mathematics control theory Linear systems Programmable control

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A hybrid model for face recognition using facial components

A hybrid model for face recognition using facial components

引用

International Symposium on Signal Processing and Its Applications (ISSPA)

作者： Mehrtash T. Harandi Majid Nili Ahmadabadi Babak N. Araabi School of cognitive science SCS Institute for Studies Theoretical Physics and Mathematics (IPM) Tehran Iran Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran Iran

ISBN: (纸本)9781424407781

It is generally agreed that faces are not recognized only by utilizing some holistic search among all learned faces, but also through a feature analysis that aimed to specify more important features of each specific face. This paper addresses a novel decision strategy that efficiently uses both holistic and facial component (eye, nose and mouth) feature analysis to recognize faces. The proposed algorithm first performs a holistic search using the whole image features and selects probable candidates for further processing. Then the facial features of these probable candidates are compared and classified with the stored patterns in the train set. Finally the classification results are fused with a weighted majority voting to form the final decision. Simulation studies justify the superior performance of the proposed method as compared to that of Eigenface method.

关键词： Face recognition Facial features Humans Nose Mouth Linear discriminant analysis Lighting Voting Principal component analysis Independent component analysis

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Serial Communicationable Ballast Realization for Electrodeless Fluorescent Lamps using an Erasable Programmable Logic Device

Serial Communicationable Ballast Realization for Electrodele...

引用

International Conference on electrical Machines and Systems 2007(ICEMS2007)(第十届国际电机与系统会议)

作者： Xian-Chao Ma Hoon Kim Hai Xu Hee-Jun Kim Department of Electronics Electrical Control and Instrumentation Engineering Hanyang University Division of Electrical Engineering and Computer Science Hanyang University Korea

Electrodeless lamps have long bulb life, but their application areas are limited in situations where replacement costs are high. In such areas, a communication way is required between ballasts and a control system as well. This paper presents a serial communication module realization method using an erasable programmable logic device. To verify the proposed method, a 150 W prototype ballast was made and confirmed a communication to PC. This way can be easily realized as a standard-cell ASIC, because it was implemented without a microprocessor.

关键词： Electronic ballasts Fluorescent lamps Programmable logic devices Electrodeless lamps Costs Communication system control control systems Prototypes Application specific integrated circuits Microprocessors

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Output feedback control and sensor placement for a hypersonic vehicle model

Output feedback control and sensor placement for a hypersoni...

引用

AIAA Guidance, Navigation, and control Conference 2007

作者： Jankovsky, Pete Sigthorsson, David O. Serrani, Andrea Yurkovich, Stephen Bolender, Michael A. Doman, David B. Collaborative Center for Control Science Ohio State University Columbus OH 43210 United States Air Force Research Laboratory Wright-Patterson Air Force Base Dayton OH 45433 United States Department of Electrical and Computer Engineering 2015 Neil Ave. Columbus OH United States AFRL/VACA 2210 Eighth St. Dayton OH United States AIAA United States

ISBN: (纸本)1563479044

This paper addresses issues related to output feedback control, including sensor placement, for a model of an air-breathing hypersonic vehicle. The model presents a number of control challenges, in particular because of strong couplings between the propulsive and aerodynamic forces. Because of the vehicle's low weight, slenderness, and length, the vehicle's flexibility has a large impact on stability and control of the vehicle. Two output feedback control methods are developed. One applies reconstruction of the flexible body system states, toward applications of state feedback control. The other uses a robust design that does not rely on an observer to ensure stabilization and performance throughout a given flight envelope. A rate gyroscope and an accelerometer have been modeled, incorporating the flexible effects, and strategies for sensor placement have been developed for the hypersonic vehicle model to enhance observability or to preserve certain system structures that are favorable for robust control design. Simulation results are provided to demonstrate the sensor placement strategies and output feedback control performances.

关键词： Feedback control

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Stabilization with Disturbance Attenuation over a Gaussian Channel

Stabilization with Disturbance Attenuation over a Gaussian C...

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Proceedings of the 46th IEEE Conference on Decision and control, Pages 3220-3677

作者： J. S. Freudenberg R. H. Middleton J. H. Braslavsky Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Hamilto Institute National University of Ireland Maynooth Kildare Ireland Centre for Complex Dynamic Systems and Control University of Newcastle Australia

ISBN: (纸本)9781424414970;1424414970

We propose a linear control and communication scheme for the purposes of stabilization and disturbance attenuation when a discrete Gaussian channel is present in the feedback loop. Specifically, the channel input is amplified by a constant gain before transmission and the channel output is processed through a linear time invariant filter to produce the control signal. We show how the gain and filter may be chosen to minimize the variance of the plant output. For an order one plant, our scheme achieves the theoretical minimum taken over a much broader class of compensators.

关键词： Gaussian channels linear control COMPENSATORS time-invariant Filters disturbance Gain Attenuation

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