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International Conference on Intelligence engineering Systems

作者： Patricia Grof Peter Baranyi Peter Korondi "Computer and Automation Research Institute/Cognitive Informatics Research Group Budapest University of Technology and Economics/Dept. of Telecommunications and Media Informatics Budapest University of Technology and Economics/Dept. of Mechatronics Optics and Engineering Informatics

ISBN: (纸本)9781424476527

This paper falls in the topic of qLPV state-space model based control design in which LMIs are used to optimize the multi-objective control performance. In this paper we investigate how the convex hull of the polytopic model influences the feasibility of the LMI based control design and the resulting control performances. We examine these influences through the control design of the two dimensional aeroelastic system's example. First we define various TP type polytopic model representations of a wing section whose vertices define different convex hulls. In the second step we investigate how these models lead to different control performances.

关键词： Stability Control systems Nonlinear control systems Delay effects Space technology Control design Feedback control Displacement control Force control Velocity control

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Optimized Fractional Order Conditional Integrator

Optimized Fractional Order Conditional Integrator

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American Control Conference

作者： Ying Luo YangQuan Chen Youguo Pi Concepcion A. Monje Blas M. Vinagre Dept. of Automation Science and Engineering South China University of Technology Guangzhou P. R. China Dept. of Electrical and Computer Engineering Utah State University Logan UT 84322 USA Dept. of System Engineering and Automatics Higher Technical School University Carlos III of Madrid Madrid Spain Dept. of Electrical Electronic and Automatic Engineering Industrial Engineering School University of Extremadura Spain

ISBN: (纸本)9781424474264

In this paper, an optimized fractional order conditional integrator (OFOCI) is proposed. The key feature of this OFOCI is that, the fractional order alpha and the parameter k for the "hold" value in the course of integration can be tuned following the analytical optimality design specifications, to achieve the optimized performance not achievable using integer order conditional integrators. The proposed optimality specifications are given to satisfy the desired phase delay, and minimize the preferred magnitude ratio, which can be calculated from the high order harmonic magnitudes divided by the magnitude of the fundamental wave. The numerical solution of calculating the optimized parameters alpha and k of the OFOCI is introduced. The phase delays and magnitude ratios of four designed OFOCIs are compared with the integer order conditional integrators. Simulation results with the FFT spectra are also presented to validate the theoretical analysis.

关键词： Clegg conditional integrator intelligent conditional integrator fractional order conditional integrator phase delay high order harmonic wave describing function optimality specifications phase delay Describing functions integrators fractional order Integer Conditional magnitude ratio

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Performance/Robustness Limit Evaluation for Lyapunov-Stable Nonlinear Plants

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IFAC Proceedings Volumes 2010年第10期43卷 202-207页

作者： Cs. Bányász L. Keviczky Computer and Automation Research Institute of the H. Ac. of Sc. Control Engineering Research Group of the H. Ac. of Sc.at the Dept. of Automation and Informatics Budapest Univ. of Technology and Economics H-1111 Budapest Kende u 13-17 HUNGARY

Lyapunov-stable nonlinear plants can be approximated by an LTI model in many cases. If this approximation is obtained then it is possible to construct a G2DOF control system. The paper presents a new approach how the important relationships between the actuator, process and design parameters furthermore robustness measures can be determined. In this decomposition method the optimal control design for two-degree of freedom time delay control systems is discussed. Using a proper CAD algorithm the exact relationships can be plotted and the ultimate robustness limit of any control can be explicitly calculated.

关键词： nonlinear control Lyapunov stability performance analysis robustness limit

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Bell-shaped potential functions for multi-agent formation control in cluttered environment

Bell-shaped potential functions for multi-agent formation co...

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Mediterranean Conference on Control and automation (MED)

作者： Kristian Hengster-Movrić Stjepan Bogdan Ivica Draganjac Automation & Robotics Research Institute University of Texas Arlington USA Automatin&Robotics Research Institute University of Texas at Arilington USA Dept. of Control and Computer Engineering University of Zagreb CROATIA Croatia

In this paper we analyze stability properties of multi-agent control system in a cluttered environment with an artificial potential based on bell-shaped functions. In our approach attractive and repulsive forces created by potential gradient have the same form which allows definition of target formation that is parameter invariant. Due to the fact that agents are identical, the proposed structure of formation potential is invariant to the interchange of agents configurations, hence, target in which particular agent would eventually end up, depends only on formation initial condition and environment structure (obstacles). We show that position of unwanted stable equilibria can be controlled by parameters that define elementary potential functions. This fact has been used for synthesis of an adaptation algorithm, such that arrival of agents at required formation is guarantied. Simulation results, presented at the end of the paper, confirm correctness of the proposed control scheme.

关键词： Navigation Stability analysis Force Lead Trajectory Geometry

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Useful clock skew optimization under a multi-corner multi-mode design framework

Useful clock skew optimization under a multi-corner multi-mo...

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IEEE International Symposium on Quality Electronic Design

作者： Weixiang Shen Yici Cai Wei Chen Yongqiang Lu Qiang Zhou Jiang Hu Tsinghua University Beijing Beijing CN Dept. of Computer Science and Technology Tsinghua University Beijing P.R. China Magma Design Automation Inc. San Jose CA U.S.A Dept. of Electrical and Computer Engineering Texas A&M University College Station TX U.S.A

ISBN: (纸本)9781424464548

As VLSI technology scales into sub-65 nm realm, the complexity of timing optimization is drastically increased by the consideration of power and variations. Even though designers make great efforts during physical design, they are often faced with still heavy timing violations in deep post-routing stages. For the entire design convergence and timing closure, especially under current multi-corner multi-mode design, some more efficient methods need to be invented. In this work, we propose to address such a kind of issue by exploiting useful clock skew, which can help reduce timing violations rapidly. We also add mode/corner metric balancing measurements to make this method more flexible and applicable especially in such deep stages while the CTS is ready. The results indicate that our method can achieve an average improvements of 33.16% on the worst slack (WS) and 75.56% on the total negative slack (TNS), respectively.

关键词： Clocks Design optimization Timing Routing Process design Electronic design automation and methodology computer science Design automation Drives Power engineering computing

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Influence of contact resistance on shielding efficiency of shielding gutters for HV cables

Influence of contact resistance on shielding efficiency of s...

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Biennial Institute of Electrical and Electronics Engineers Conference on Electomagnetic Field Computation

作者： S. Koroglu P. Sergeant R. Sabariego Vuong Q. Dang M. De Wulf Dept. Electrical Engineering Yildiz Technical University Dept. Electrical Energy Systems and Automation Ghent University Dept. Electrical Engineering & Computer Science ACE ArcelorMittal Global R&D Gent

ISBN: (纸本)9781424470594

Shielding of buried three phase high voltage cables can be done by placing the cables in conducting ferromagnetic U-shaped gutters covered by plates. In case of a perfect electrical contact between adjacent gutters and between adjacent cover plates, the induced currents in the shield efficiently reduce the field generated in the vicinity of the cables. However, as a perfect contact cannot be guaranteed, it is useful to quantify the effect of a bad electrical contact on the shielding performance. From 2D FEM, 3D FEM and experiments, it is observed that a bad contact does not influence significantly the shielding if the axial length of the plates is relatively long compared to their other dimensions.

关键词： Shield Gutter Plates contact resistance shielding effectiveness PLATES shielding properties cable axial length Induced currents

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Extended TP model transformation for polytopic representation of impedance model with feedback delay

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WSEAS Transactions on Systems and Control 2010年第9期5卷 701-710页

作者： Galambos, Péter Baranyi, Péter Korondi, Péter Computer and Automation Research Institute Hungarian Academy of Sciences Cognitive Informatics Group Kenede u. 13-17 H-1111 Budapest Hungary Budapest University of Technology and Economics Dept. of Manufacturing Science and Technology Kenede u. 13-17 H-1111 Budapest Hungary Budapest University of Technology and Economics Dept. of Telecommunications and Media Informatics Kenede u. 13-17 H-1111 Budapest Hungary Budapest University of Technology and Economics Dept. of Mechatronics Optics and Engineering Informatics Kenede u. 13-17 H-1111 Budapest Hungary

In force controlled industrial robots, haptic and telemanipulation devices stability and control performance are contradicting requirements. In distributed systems where the sensors, actuators and control logic are separated in space, due to the network delays the control process may become unstable. In our research, we consider the coupled impedance type control algorithms as common used method in telemanipulation and interaction control of robots. In this paper, an extended TP model transformation is proposed to convert the delayed system into a polytopic tensor product (TP) model considering the value of the feedback delay as a parameter. Using such model, controller design become tractable as it does not contain feedback delay. A numerical example for a single degree of freedom impedance model with feedback delay is discussed. The results are confirmed by simulation.

关键词： Industrial robots

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Robust fault detection and diagnosis for uncertain nonlinear systems

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Journal of Systems engineering and Electronics 2009年第5期20卷 1031-1036页

作者： Wang Wei Tahir Hameed Ren Zhang Zhou Kemin School of Automation Science and Electrical Engineering Beihang Univ. Beijing 100191 P. R. China Dept. of Electrical and Computer Engineering Louisiana State Univ. Baton Rouge LA 70803 USA

This paper considers robust fault detection and diagnosis for input uncertain nonlinear systems. It proposes a multi-objective fault detection criterion so that the fault residual is sensitive to the fault but insensitive to the uncertainty as much as possible. Then the paper solves the proposed criterion by maximizing the smallest singular value of the transformation from faults to fault detection residuals while minimizing the largest singular value of the transformation from input uncertainty to the fault detection residuals. This method is applied to an aircraft which has a fault in the left elevator or rudder. The simulation results show the proposed method can detect the control surface failures rapidly and efficiently.

关键词： nonlinear system robust fault detection and diagnosis singular value flight control system.

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A study on the effects of highlighted display on knowledge worker productivity

A study on the effects of highlighted display on knowledge w...

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Asia Simulation Conference 2009, JSST 2009

作者： Seo, Jinwu Yoo, Kyungyong Park, Jinwoo Dept. of Industrial Engineering Automation and Systems Research Institute Seoul National University Korea Republic of Dept. of Computer Engineering Kyunghee University Korea Republic of

This study is concerned with the influence of computer monitors on office productivity. A monitor is a kind of bottleneck in an office workstation that limits the exchange of information between a worker and the computer. This study uses experiments to show that the effect of the monitor on productivity is serious, especially for creative types of work. The amount of information a worker actually needs is small compared with all of the information displayed on the monitor, and software called HiDi is proposed here to enable the user to display the contents of an application that the worker needs. HiDi is application independent free form and compatible with existing task management systems and visualization techniques.

关键词： Productivity

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Sparse representation of cast shadows via 1-regularized least squares

Sparse representation of cast shadows via 1-regularized leas...

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12th International Conference on computer Vision, ICCV 2009

作者： Mei, Xue Ling, Haibin Jacobs, David W. Center for Automation Research Electrical and Computer Engineering Dept. University of Maryland College Park MD United States Center for Information Science and Tech. Computer and Information Science Dept. Temple University Philadelphia PA United States Center for Automation Research Computer Science Dept. University of Maryland College Park MD United States

ISBN: (纸本)9781424444205

Scenes with cast shadows can produce complex sets of images. These images cannot be well approximated by low-dimensional linear subspaces. However, in this paper we show that the set of images produced by a Lambertian scene with cast shadows can be efficiently represented by a sparse set of images generated by directional light sources. We first model an image with cast shadows as composed of a diffusive part (without cast shadows) and a residual part that captures cast shadows. Then, we express the problem in an 1- regularized least squares formulation, with nonnegativity constraints. This sparse representation enjoys an effective and fast solution, thanks to recent advances in compressive sensing. In experiments on both synthetic and real data, our approach performs favorably in comparison to several previously proposed methods. ©2009 IEEE.

关键词： Light sources

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