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American control Conference (ACC)

作者： Hyunjin Lee Daniel E. Rivera Hans D. Mittelmann Gautam Pendse Control Systems Engineering Laboratory Department of Chemical Engineering Arizona State University Tempe AZ USA Department of Mathematics and Statistics Arizona State University Tempe AZ USA

The design of constrained, "plant-friendly" multisine input signals that optimize a geometric discrepancy criterion arising from Weyl's theorem is examined in this paper. Such signals are meaningful for data-centric estimation and control methods, where uniform coverage of the output state-space contributes greatly to good performance. The optimization problem includes a search for both the Fourier coefficients and phases in the multisine signal, resulting in a uniformly distributed output signal that achieves a desirable balance between high and low gain directions, an important consideration when identifying strongly interactive multivariable systems. The solution involves very little user intervention and has significant benefits compared to multisine signals that minimize crest factor. The usefulness of this problem formulation is shown by applying it to a case study involving composition control of a binary distillation column.

关键词： Predictive models Design optimization Signal design Predictive control Signal processing Constraint theory Constraint optimization State estimation MIMO Distillation equipment

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Federated filtering for fault tolerant estimation and sensor redundancy management in coupled dynamics distributed systems

Federated filtering for fault tolerant estimation and sensor...

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Mediterranean Conference on control and Automation (MED)

作者： A. Edelmayer M. Miranda Faculty of Engineering Department of Chemical Engineering Laboratory of Unit Operations University de Los Andes Merida Venezuela Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary

This paper discusses the application of the idea of federated filtering to the estimation of intrinsically nonlinear distributed systems by examining its impacts on filtering performance by using the Extended Kalman Filter (EKF) as state estimator. Specifically, the performance of the traditional centralized solution is compared with the filtering structure obtained using the federating idea, and their conceptions, and their ability to balance between fault tolerance and estimation accuracy is examined. Our research demonstrates how successfully the EKF for solving nonlinear estimation problems in federated structures can be used, noting that the idea of federation have only been demonstrated for linear problems previously. In addressing the demands of both fault tolerance and estimation accuracy, it is shown that increased filtering accuracy is relied on the proper choice of sharing of the error covariance information between local filters, while sensor fault tolerance is provided by the utilization of an appropriate resetting policy of the filter.

关键词： Fault tolerant systems Sensor systems Redundancy Nonlinear filters Fault tolerance control systems Information filtering Information filters Computer architecture Sensor arrays

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Time-varying port-representation of dissipative structures with gauge transformations

Time-varying port-representation of dissipative structures w...

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European control Conference (ECC)

作者： Gou Nishida Masaki Yamakita Zhi-wei Luo RIKEN(The Institute of Physical and Chemical Research) Environment Adaptive Robotic Systems Lab Nagoya Aichi JAPAN Department of Mechanical and Control Engineering RIKEN BMC Meguro-ku Tokyo JAPAN Department of Computer and Systems Engineering RIKEN BMC Kobe Hyogo JAPAN

A distributed-port-Hamiltonian system is a generalized model for passivity-based controls. The system representation has been extended to an infinite-dimensional conservative system derived from variational calculus, which is called a field-port-Lagrangian system. A lot of practical systems for control engineering include dissipative elements; however such a non-conservative structure usually cannot be defined by a variational problem. This paper shows that a system with the dissipative structure can be defined as a time-varying fieldport-Lagrangian system by a gauge transformation. First, we show that the gauge transformation generates a time-dependent Lagrangian density functional that introduces the time-varying port-representation. Next, we present that a class of dissipative systems can be identified with a conservative system possessing an internal irreversible energy flow. Finally, we illustrate an equation of elastic films with viscosity damping with the time-varying port-representation.

关键词： Equations Vectors Viscosity Time-varying systems Mathematical model Damping Indexes

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Packaging material developments for next generation vehicles

Packaging material developments for next generation vehicles

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40th International Symposium on Microelectronics, IMAPS 2007

作者： Ishii, Toshiaki Odakura, Yasunori Urushiwara, Noriyoshi Takezawa, Yoshitaka Takahashi, Akio ECU 1st Design Dept. Electronic Control Systems Div. Automotive Systems Hitachi Ltd. 2520 Oaza-takaba Hitachinaka-shi Ibaraki-ken 312-8503 Japan Dept. Electronic Materials and Devices Research Hitachi Research Laboratory Hitachi Ltd. 1-1 Omika-cho 7-chome Hitachi-shi Ibaraki-ken 319-1292 Japan Division of Materials Science and Chemical Engineering Faculty of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama-shi 240-8501 Japan

ISBN: (纸本)0930815823

The number of hybrid vehicles is expanding contributing to reducing CO 2 emission and fuel consumption in relation to environmental issue. In addition, to materialize more safety vehicles, the future active safety system is being developed. Consequently, the next generation vehicles to realize low emission, safety driving and comfortable compartments are increasingly required. systems for the next generation vehicles require many electronics such as sensing devices, electronically control components, inverters and control units, since the systems are electrically-powered and electronically-controlled. Those electronic components should be not only small, lightweight and low cost but also highly reliable. The higher power density of the component due to smaller packaging requires technologies of high heat dissipation and heat resistance. We place expectations on materials as a break-through technology for automotive electronics. Advanced materials and approaches for automotive electronics are presented in this paper.

关键词： Hybrid vehicles

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Experimental verifications on control and sensing of bucky gel actuator/sensor

Experimental verifications on control and sensing of bucky g...

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2007 IEEE/RSJ International Conference on Intelligent Robots and systems

作者： Norihiro Kamamichi Masaki Yamakita Kinji Asaka Zhi-Wei Luo Toshiharu Mukai Bio-mimetic Control Research Center (BMC) The Institute of Physical and Chemical Research (RIKEN) Nagoya Japan Department of Robots and Mechatronics School of Future Science Tokyo Denki University Tokyo Japan BMC RIKEN Japan Department of Mechanical and Control Engineering Graduate School of Science Tokyo Institute of Technology Tokyo Japan BMC RIKEN Research Institute for Cell Engineering National Institute of Advanced Industrial Science and Technology (AIST) Odaka Japan Department of Computer and Systems Engineering Kobe University Kobe Japan

Bucky gel actuator is a novel electro-active polymer (EAP), which is a low-voltage driven dry soft actuator. Its device has a bimorph structure with polymer-supported bucky gel electrodes and a polymer-supported ionic gel electrolyte. It can be fabricated by layer-by-layer casting, to form any shape easily. In addition, the bucky gel device generates electromotive force when bending, and then it also can be used as a sensor. Since sensor and actuator functions exist in a same device, flexible and miniature integrated actuator-sensor systems for soft robotics can be constructed easily. In this study, we conduct some experiments to verify the possibility of the bucky gel actuator/sensor. Feedback controls of the actuator are demonstrated and the characteristics of the sensor are investigated. By utilizing both functions of the actuator and the sensor, feedback control based on the sensor signal is demonstrated.

关键词： Actuators Sensor phenomena and characterization Polymer gels Feedback control Electrodes Casting Shape Force sensors Sensor systems Robot sensing systems

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Preface

Lecture Notes in Control and Information Sciences

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Lecture Notes in control and Information Sciences 2007年第1期358卷 V-VI页

作者： Findeisen, Rolf Allgöwer, Frank Biegler, Lorenz T. Institute for Systems Theory and Automatic Control University of Stuttgart Pfaffenwaldring 9 Stuttgart70550 Germany Chemical Engineering Department Carnegie Mellon University PittsburghPA15213 United States

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Process control education using inventory management in supply chains

Process control education using inventory management in supp...

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作者： Schwartz, Jay D. Rivera, Daniel E. Control Systems Engineering Laboratory Department of Chemical and Materials Engineering Arizona State University Tempe AZ 85287-6006 United States

ISBN: (纸本)9783902661074

Supply chain management (SCM) is concerned with the efficient movement of goods through a network of suppliers and retailers. Effective SCM represents a crucial imperative for all modern, global enterprises. As delayed and uncertain dynamical systems, supply chains provide an excellent opportunity for demonstrating the benefits of control principles to what is traditionally perceived as a "business" problem. This paper describes a series of control systems for a standard production-inventory system (the basic unit of a supply chain) which have been used at Arizona State University as MATLAB ®-based exercises in both undergraduate and graduate-level process control courses. Among the important control concepts illustrated by these exercises are: 1) modeling of supply chain dynamics using fluid analogies, 2) the benefits of multi-degree-of-freedom feedbackfeedforward control over feedback-only control, and 3) the application of Internal Model control and Model Predictive control. Copyright © 2006 IFAC.

关键词： Model predictive control

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control-RELEVANT DEMAND MODELING FOR SUPPLY CHAIN MANAGEMENT

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IFAC Proceedings Volumes 2006年第1期39卷 267-272页

作者： Jay D. Schwartz Daniel E. Rivera Control Systems Engineering Laboratory Department of Chemical and Materials Engineering Arizona State University Tempe Arizona 85287-6006

The development of control-oriented decision policies for inventory management in supply chains has received considerable interest in recent years, and demand modeling to supply forecasts for these policies is an important component of an effective solution to this problem. Drawing from the problem of control-relevant identification, we present an approach for demand modeling based on data that relies on a control-relevant prefilter to tailor the emphasis of the fit to the intended purpose of the model, which is to provide forecast signals to a tactical inventory management policy based on Model Predictive control. Integrating the demand modeling and inventory control problems offers the opportunity to obtain reduced-order models that exhibit superior performance, with potentially lower user effort relative to traditional “open-loop„ methods. A systematic approach to generating these prefilters is presented and the benefits resulting from their use are demonstrated on a representative production/inventory system case study.

关键词： control-relevant identification supply chain management demand modeling model reduction

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PROCESS control EDUCATION USING INVENTORY MANAGEMENT IN SUPPLY CHAINS

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IFAC Proceedings Volumes 2006年第6期39卷 631-636页

作者： Jay D. Schwartz Daniel E. Rivera Control Systems Engineering Laboratory Department of Chemical and Materials Engineering Arizona State University Tempe AZ 85287-6006

Supply chain management (SCM) is concerned with the efficient movement of goods through a network of suppliers and retailers. Effective SCM represents a crucial imperative for all modern, global enterprises. As delayed and uncertain dynamical systems, supply chains provide an excellent opportunity for demonstrating the benefits of control principles to what is traditionally perceived as a “business” problem. This paper describes a series of control systems for a standard production-inventory system (the basic unit of a supply chain) which have been used at Arizona State University as MATLAB®-based exercises in both undergraduate and graduate-level process control courses. Among the important control concepts illustrated by these exercises are: 1) modeling of supply chain dynamics using fluid analogies, 2) the benefits of multi-degree-of-freedom feedback-feedforward control over feedback-only control, and 3) the application of Internal Model control and Model Predictive control.

关键词： Supply Chain Management Production and Inventory control PID control Internal Model control Model Predictive control

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FAULT DETECTION USING CORRESPONDENCE ANALYSIS: APPLICATION TO TENNESSEE EASTMAN CHALLENGE PROBLEM

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IFAC Proceedings Volumes 2006年第2期39卷 705-710页

作者： K.P. Detroja R.D. Gudi S.C. Patwardhan Interdisciplinary Programme on Systems and Control Engineering Department of Chemical Engineering Indian Institute of Technology Bombay Powai Mumbai – 400076 India

This paper presents an approach based on the use of correspondence analysis (CA) for the task of fault detection and diagnosis. Unlike other tools (PCA / DPCA) that are used for this latter task, CA is shown to use a different metric to represent the information content in the data matrix X . Decomposition of the information represented in the metric is shown to yield superior performance from the viewpoints of data compression, discrimination and classification as well as early detection of faults. We demonstrate these performance improvements over PCA and DPCA on the Tennessee Eastman problem, which is a representative benchmark problem used in the literature. CA is shown to yield vastly superior performance for the monitoring of the TE problem, when compared with PCA and DPCA.

关键词： Correspondence Analysis (CA) Principal Components Analysis (PCA) Dynamic PCA (DPCA) Fault Detection (FD)

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