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Chinese control Conference (CCC)

作者： Huijun Gao Tongwen Chen James Lam Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin China Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada Department of Mechanical Engineering University of Hong Kong Hong Kong China

This paper proposes a new model for time-delay systems, which contains multiple successive delay components in the state and has important applications in remote control and network based control. New results on stability and H ∞ performance are obtained for systems with two successive delay components. The second part of this paper applies the proposed new model to network based control, which has emerged as a topic of significant interest in the control community. A sampled-data networked control system with simultaneous consideration of network induced delays, data packet dropouts and measurement quantization is modelled as a time-delay system with two successive delay components in the state and, the problem of network based H ∞ control is solved accordingly.

关键词： Stability Space technology Delay effects Delay systems Application software Networked control systems Quantization Differential equations Solid modeling Mechanical engineering

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Path Planning in an Environment with Static and Dynamic Obstacles Using Genetic Algorithm: A Simplified Search Space Approach

Path Planning in an Environment with Static and Dynamic Obst...

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Congress on Evolutionary computation

作者： H. Mahjoubi F. Bahrami C. Lucas Control and Intelligence Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran School of Cognitive Sciences Institute of Studies in Theoretical Physics and Mathematics Tehran Iran

This paper discusses a novel step by step path planning method which uses genetic algorithm (GA) to find the feasible and suitable paths in an environment with static and dynamic obstacles. To increase the speed of calculations, dimension of the search space is reduced by developing a new method to represent the environment. This representation method is based on detecting the corners of circumferential polygons of all obstacles as representatives of the environment. Each individual (or path) is a subsequence of these points including the start and destination points as the first and last genes in the sequence. Thus, each individual will be of a variable length. If an individual represents a path which passes over some obstacles, it will be unfeasible; otherwise it represents a feasible path. To produce new generations, four evolutionary operators are defined. The goal is to find a short feasible path, which clearly is not unique. In addition, using a step by step path planning approach and updating the representation of the environment at each step will result in a robust performance of the algorithm in two dimensional (2D) static and dynamic environments.

关键词： Path planning Genetic algorithms Layout Humans Robustness Manufacturing Assembly systems Transportation Process control Intelligent control

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Approximate feedback linearization of an air-breathing hypersonic vehicle

Approximate feedback linearization of an air-breathing hyper...

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AIAA Guidance, Navigation, and control Conference 2006

作者： Parker, Jason T. Serrani, Andrea Yurkovich, Stephen 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)1563478196

This paper describes the design of a nonlinear control law for an air-breathing hypersonic vehicle. The model of interest includes flexibility effects and intricate couplings between the engine dynamics and flight dynamics. To overcome the analytical intractability of this model, a nominal control-oriented model is constructed for the purpose of feedback control design. Analysis performed on the nominal model reveals the presence of unstable zero dynamics with respect to the output to be controlled, namely altitude and velocity. By neglecting certain weaker couplings and resorting to dynamic extension at the input side, a simplified nominal model with full vector relative degree with respect to the regulated output is obtained. Standard dynamic inversion can then be applied to the simplified nominal model, and this results in approximate linearization of the nominal model. Finally, a robust outer loop control is designed using LQB, with integral augmentation in a model reference scheme. Simulation results are provided to demonstrate that the approximate feedback linearization approach achieves excellent tracking performance on the truth model for two choices of the system output. Finally, a brief case study is presented to qualitatively demonstrate the robustness of the design to parameter variations. Copyright © 2006 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Hypersonic aerodynamics

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computationally tractable inventory control for large-scale reverse supply chains

Computationally tractable inventory control for large-scale ...

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American control Conference (ACC)

作者： P. Krishnamurthy F. Khorrami D. Schoenwald Control/Robotics Research Laboratory(CRRL) Department of Electrical and Computer Engineering Six Metrotech Center Polytechnic University Brooklyn NY USA Sandia National Laboratories Albuquerque NM USA

We propose a new inventory control technique for large-scale bidirectional (or closed-loop) supply chains including repairs. It is well-known that available optimization techniques are computationally intractable for bidirectional stochastic supply chains and also necessitate several simplifying assumptions. In contrast, the proposed approach is an adaptive scheme which scales well to practically interesting large-scale multi-item supply chains. Furthermore, practical issues such as stochastic transport delays, manufacturing times, and repair times and probabilistic characterization of part repair success are handled in a unified framework. The control scheme is based on a hierarchical two-level architecture comprised of an adaptive set-point generator and a lower-level order-up-to policy. An application to aircraft supply chains involving multiple OEMs, depots, bases, squadrons, and planes is also investigated

关键词： Inventory control Large-scale systems Supply chains Laboratories Manufacturing Stochastic processes Aircraft manufacture Programmable control Adaptive control Transportation

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Nonlinear modeling of a flight vehicle using fuzzy clustering

Nonlinear modeling of a flight vehicle using fuzzy clusterin...

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IEEE International Conference on Granular Computing (GRC)

作者： A.R. Mehrabian S.V. Hashemi J. Roshanian S. Mohagheghi The Control and Intelligence Processing Center of Excellence University of Tehran Iran Department of AeroSpace Engineering K.N. Toosi University of Technology Tehran Iran School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

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Delay-dependent stability of 2D state-delayed linear systems

Delay-dependent stability of 2D state-delayed linear systems

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： W. Paszke J. Lam K. Galkowski Shengyuan Xu E. Rogers A. Kummert Institute of Control and Computation Engineering University of Zielona Góra Zielona Gora Poland Department of Mechanical Engineering University of Hong Kong Hong Kong China Department of Automation Nanjing University of Science and Technology of PLA Nanjing China Faculty of Electrical Information and Media Engineering University of Wuppertal Wuppertal Germany School of Electronics and Computer Science University of Southampton Southampton UK

This paper addresses the problem of stability for two-dimensional systems with delays in the state. To solve this problem, the Lyapunov second method is used. The resulting condition is written in terms of linear matrix inequalities and it is dependent on the size of delays. This fact allows us to reduce the conservatism in the stability analysis of two-dimensional systems with state delays. A simulation example is given to illustrate the theoretical developments

关键词： Stability Linear systems Delay systems Symmetric matrices control systems Linear matrix inequalities Delay lines Automatic control control engineering computing Mechanical engineering

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ROBUST STABILITY CHECKING OF A CLASS OF LINEAR INTERVAL FRACTIONAL ORDER SYSTEM USING LYAPUNOV INEQUALITY

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IFAC Proceedings Volumes 2006年第11期39卷 89-94页

作者： Hyosung Ahn YangQuan Chen Igor Podlubny Center for Self-Organizing and Intelligent Systems (CSOIS) Department of Electrical and Computer Engineering Utah State University Logan UT 84322-4160 USA Department of Applied Informatics and Process Control Technical University of Kosice B. Nemcovej 3 04200 Kosice Slovak Republic

This paper provides a new analytical robust stability checking method of fractional-order linear time invariant interval uncertain system. This paper continues the authors’ previous work (Chen et al., 2005a) where matrix perturbation theory was used. For the new robust stability checking, Lyapunov inequality is utilized for finding the maximum eigenvalue of a Hermitian matrix. Through numerical examples, the usefulness and the effectiveness of the newly proposed method are verified.

关键词： Fractional order linear dynamic systems robust stability interval linear time invariant systems interval matrix

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The Method of Data Pre-processing in Grey Information Systems

The Method of Data Pre-processing in Grey Information System...

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International Conference on control, Automation, Robotics and Vision (ICARCV)

作者： S.X. Wu S.F. Liu M.Q. Li School of Economics and Management Nanjing University of Aeronautics and Astronautics Nanjing China Center for Systems and Control Xiamen University Xiamen Fujian China Department of Electrical & Computer Engineering National University of Singapore Singapore

In this paper, a method of data pre-processing in grey information systems was proposed to deal with grey information. The binning technique was introduced to smooth noisy data used for grey relative analysis. It constructed the function of grey relative coefficient for each null value and filled up the null value with the solution of the function. It also can be used to detect noisy data. This method is an application of grey system theory in data pre-processing. It has great significance in filling up null values and detecting noisy data in the "poor" information database

关键词： Information systems Data mining Databases engineering management control systems Null value Filling Management information systems Statistical distributions Smoothing methods

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碳纳米管灯泡发光性能研究

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科学通报 2006年第14期51卷 1725-1728页

作者：李传刚王昆林韦进全魏秉庆朱宏伟王志诚骆建彬刘文今郑明新吴德海清华大学机械工程系先进成形制造教育部重点实验室 Department of Electrical & Computer Engineering and Center for Computation & Technology Louisiana State UniversityBaton RougeLA 70803USA

采用长度为分米量级的双壁碳纳米管薄膜与长丝制成了碳纳米管灯泡，并与钨丝白炽灯作对比，研究了碳纳米管灯泡的发光效率、电工参数以及热稳定性能．结果表明，碳纳米管灯泡可以发出与钨丝白炽灯相同的白光，在相同温度（1400～2300K... 详细信息

采用长度为分米量级的双壁碳纳米管薄膜与长丝制成了碳纳米管灯泡，并与钨丝白炽灯作对比，研究了碳纳米管灯泡的发光效率、电工参数以及热稳定性能．结果表明，碳纳米管灯泡可以发出与钨丝白炽灯相同的白光，在相同温度（1400～2300K）下，碳纳米管灯泡的光效比钨丝灯泡平均提高40％．碳纳米管灯丝电阻随温度变化不明显，并且具有较高的热稳定性能，2300K高温下通电24h，结构不发生明显变化．

关键词：碳纳米管灯泡电致发光

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Study of Grey Rough Set Model Based on Tolerance Relation

Study of Grey Rough Set Model Based on Tolerance Relation

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International Conference on control, Automation, Robotics and Vision (ICARCV)

作者： S.X. Wu S.H. Shi S.F. Liu M.Q. Li School of Economics and Management Nanjing University of Aeronautics and Astronautics Nanjing China Center for Systems and Control Xiamen University Xiamen Fujian China Department of Electrical & Computer Engineering National University of Singapore Singapore Department of Computer Shenzhen Polytechnic Shenzhen Guangdong China

This paper analyses several extended rough set models in incomplete information systems and proposes a tolerance relation based model of processing grey incomplete information systems, which is an extension to rough set models. The method of the model is: firstly partitioning the original incomplete information system by introduced threshold value, then establishing tolerance classes through grey tolerance relation and obtaining upper and lower approximations through these tolerance classes. Moreover, a method of whitening grey numbers based on grey tolerance relation is given. This paper shows that the model accords with practice according to examples and the algorithm of whitening grey numbers is also comparatively ideal. The more important point is that the subjective needs are considered during partitioning grey tolerance classes by introducing threshold value. So it is consistent with the system methodology of person-oriented person-to-machine communication

关键词： Information systems Set theory control systems Rough sets Concurrent computing engineering management Stress control Null value Humans Information analysis

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