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IEEE International Symposium on Industrial Electronics (ISIE 96)

作者： Abe, N Seki, K Kanoh, H MEIJO UNIV DEPT PRECIS ENGNKAWASAKIKANAGAWA 21471JAPAN

ISBN: (纸本)0780333349

Two degree freedom Internal Model Control (IMC) is implemented for the temperature control of a single tubular heat exchanger system. The experimental heat exchanger system is very simple structure, however, the characteristics is regarded as a distributed parameter system and time delay made by software, the plant is regarded as complex system. To the aim of applying to IMC structure, we approximate the heat exchanger system to a time delay model from a frequency response examination. In the laboratory experiment, it is clear that: 1) The two degree of freedom IMC is effective for time delay system. 2) The two degree of freedom performance of IMC was superior to one degree freedom IMC. The disturbance was reduced rather than PI controller or one degree of freedom IMC design. 3) Since the controller had two degree of freedom, the one tuning filtering parameter of IMC controller effected the tracking of reference and the other tuning parameter of IMC reduce disturbance. 4) The design method was simple as ordinary one degree freedom IMC design. 5) Since IMC controller was constructed from system model, there were some problems to set up the modeling and identifications.

关键词： Internal Model Control two degree of freedom Time Delay system Heat Exchanger system distributed parameter system

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Optimal control and admissible relaxation for subdifferential evolution inclusions

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Periodica Mathematica Hungarica 1996年第1期33卷 1-22页

作者： Cardinali, Tiziana Papageorgiou, Nikolaos S. Department of Mathematics Perugia University Via Vantitelli 1 Perugia 06123 Italy Department of Mathematics National Technical University Zografou Campus Athens 15780 Greece

In this paper we study the relaxation of optimal control problems monitored by subdifferential evolution inclusions. First under appropriate convexity conditions, we establish an existence result. Then we introduce the relaxed problem and show that it always has a solution under fairly general hypotheses on the data. Subsequently we examine when the relaxation is admissible. So we show that every relaxed trajectory can be approximated by extremal original ones (i.e. original trajectories generated by bang-bang controls) and that the values of the original and relaxed problems are equal. Some examples are also presented. © Akadémiai Kiadó, Budapest.

关键词： distributed parameter system Probability measure Relaxation Subdifferential inclusion Transition probability boundary control

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Control of temperature distribution and separation efficiency of a new zone melting process

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KAGAKU KOGAKU RONBUNSHU 1996年第3期22卷 641-647页

作者： Yoshida, M Gono, T Mikamoto, N Matsumoto, S Dept. of Chem. Eng. Tohoku Univ. Sendai 980-77 Japan

A new type of zone melting process was developed, in which an axial temperature distribution alone was moved while both heaters and a sample container were fixed. The controller for moving temperature distribution was designed based on the method previously proposed by authors for distributed parameter systems. The controller performance was satisfactor for various operation conditions. Experimental results with an eutectic organic compound show that the separation efficiency of the present process bears comparison with that of the conventional process and depends on the temperature gradient at the crystallizing interface, as well as the length of melting zone.

关键词： crystallization process control zone melting distributed parameter system macro-segregation

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Application of finite integral transform to controller design for a double-pipe heat exchanger

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KAGAKU KOGAKU RONBUNSHU 1996年第5期22卷 1157-1160页

作者： Yoshida, M Ueno, S Obi, S Matsumoto, S Department of Chemical Engineering Tohoku University Sendai 980-77

An application of modal control theory, recently developed by the authors, to the control of a double-pipe heat exchanger is presented. Since the flow rate of cold fluid is selected as a manipulated variable, the process model is described by a set of nonlinear partial differential equations. After the lineal approximation of the original model near an operating point, the finite integral transform is applied to derive a slate space representation. A controller is designed based on the derived reduced state space model. The result is demonstrated through the experiment with a small-sized double-pipe heat exchanger.

关键词： heat-exchanger process control nonlinear distributed parameter system finite integral transform

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Adaptive Identification of Heat Processes

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IFAC Proceedings Volumes 1996年第1期29卷 4516-4520页

作者： Yuri Orlov Joseph Bentsman C.I.C.E.S.E. Electronics and Telecommunication Department Ensenada Mexico P.O. Box 434944 San Diego CA 92143-4944 Department of Mechanical and Industrial Engineering University of Illinois at Urbana-Champaign 1206 West Green Street Urbana IL 61801 tel: 217-244-1076

This work presents synthesis of adaptive identifiers for distributed parameter systems (DPS) described by partial differential equations (PDE's) of parabolic type. Adjustable parameters in the adaptive identifiers proposed are shown to admit simultaneous convergence to their nominal space-varying values when an appropriate input signal is used. The class of sufficiently rich input signals referred to as generators of persistent excitation is defined. This class guarantees the existence of a unique zero steady state for the parameter errors, thereby yielding unknown plant parameters.

关键词： adaptive identifier distributed parameter system Lyapunov functional persistent excitation

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OPTIMAL ALLOCATION OF ACTUATORS FOR CONTROL OF A PARABOLIC distributed-parameter system

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KAGAKU KOGAKU RONBUNSHU 1993年第4期19卷 639-646页

作者： YOSHIDA, M MATSUI, K MATSUMOTO, S Dept. of Biochemistry and Eng. Tohoku Univ. Sendai 980 Japan Toyo Engineering Corporation Japan

A search method to determine optimal actuator allocation is proposed in the design of a control system for a linear distributed parameter system of parabolic type. It was applied to a one-dimensional heat conduction process and the controller performance was tested. The results show that the proposed method gives an accurate optimal allocation of actuators (heaters) by which a desired temperature distribution can be achieved. It was also found that the desired state distribution could be realized satisfactorily with a few actuators when they were assigned to the optimal locations.

关键词： PROCESS CONTROL distributed parameter system ACTUATOR ALLOCATION HEAT CONDUCTION

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ALLEVIATION OF CHATTERING IN FLEXIBLE BEAM CONTROL VIA PIEZOFILM ACTUATOR AND SENSOR

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AIAA JOURNAL 1995年第3期33卷 564-567页

作者： CHOI, SB Inha University Incheon 402-751 Republic of Korea

A hybrid control algorithm that combines the constant-amplitude controller (CAC) and constant-gain controller (CGC) is proposed to alleviate undesirable vibration chattering in the settled phase. By employing the proposed control algorithm, undesirable chattering in the settled phase for both transient and vibration controls is completely eliminated or substantially attenuated. These superior control performance characteristics are demonstrated through experimental implementations.

关键词： Actuators Sensors Horseshoe Vortex Control Algorithm Vibration Control Boundary Layer Separation Cantilever Beam distributed parameter system Supersonic Flow Smart Structures

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VALIDATION OF FINITE-DIMENSIONAL APPROXIMATE SOLUTIONS FOR DYNAMICS OF distributed-parameter systemS

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 1995年第1期18卷 87-95页

作者： JUNKINS, JL LEE, SC Texas A&M University College Station Texas 77843

An inverse dynamics method is introduced for constructing exact special-case solutions for hybrid coordinate ordinary/partial systems of differential equations (hybrid ODE/PDE systems). The solution is constructed such that it lies near a given approximate numerical solution, and therefore the special-case solutions can be generated in a versatile and physically meaningful fashion and can serve as a benchmark problem to validate approximate solution methods. The exact solution is constructed such that it is a differentiable, continuous-function neighbor of the given approximate numerical solution. This continuous solution is then substituted into the governing system of ODEs/PDEs and a full complement of distributed and boundary forces is determined algebraically to exactly satisfy the differential equations, This process has been automated by computer symbol manipulation. Since the exact special-case algebraic solutions can be evaluated anywhere in space and time, this approach is ideally suited to providing a true exact motion and the corresponding forces for studying the convergence errors in a family of approximate solutions. This methodology makes it possible for one to rigorously determine exact solution errors for a significant class of ODE/PDE systems for which the initial-value problem is not, in general, exactly solvable. We explore the utility of this method in validating numerical solution methods.

关键词： distributed parameter system Finite Element Approximation Second Order Differential Equations Flexible Structures Numerical Simulation Solution Algorithm Runge Kutta Methods Shear Deformation Feedback Control Riccati Equations

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FUNCTION ESTIMATION IN PREDICTING TEMPERATURE-DEPENDENT THERMAL-CONDUCTIVITY WITHOUT INTERNAL MEASUREMENTS

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JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER 1995年第4期9卷 667-673页

作者： HUANG, CH YAN, JY CHEN, HT NATL CHENG KUNG UNIV DEPT MECH ENGN TAINAN TAIWAN

The conjugate gradient method of minimization with an adjoint equation is used successfully to solve the inverse problem in estimating the temperature-dependent thermal conductivity of the homogeneous as well as nonhomogeneous solid material. It is assumed that no prior information is available on the functional form of the unknown thermal conductivity in the present study, thus, it is classified as the function estimation in inverse calculation. The accuracy of the inverse analysis is examined by using simulated exact and inexact measurements obtained within the medium. Results show that an excellent estimation on the thermal conductivity can be obtained with any arbitrary initial guesses by using just boundary measurements (i.e., internal measurements are unnecessary) within 1 s CPU time in a VAX-9420 computer. The advantages of applying this algorithm in inverse analysis can greatly simplify the experimental setup, diminish the sensitivity to the measurement errors, and reduce the CPU time in inverse calculation, while the reliable predictions can still be achieved.

关键词： Thermal Conductivity Conjugate Gradient Method Inverse Problems Transient Heat Conduction Thermal Properties Thermocouples Steepest Descent Method Internal Combustion Engines Lagrange Multipliers distributed parameter system

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GENERAL ATTITUDE MANEUVERS OF SPACECRAFT WITH FLEXIBLE STRUCTURES

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 1995年第2期18卷 264-271页

作者： LIN, YY LIN, GL National Cheng Kung University Tainan Taiwan Republic of China

An efficient composite control strategy is proposed in this paper permitting simultaneous multi-axis reorientation of a spacecraft with flexible structures. The proposed control, separating large and small motions of the dynamic system, includes three parts that can be independently designed and tuned. For each maneuver, an open-loop referencing attitude control trajectory is derived by considering the spacecraft as rigid and executed by part 1. Flexural deformations of the structures are stabilized by part 2. Part 3, encompassing part 1 and part 2 control results and external disturbances, is an optimal guidance that tracks part 1 reference trajectory and achieves the specified final attitude in finite time. Three simulation cases are included in which a flexible model spacecraft is used. Collocated actuators and sensors are placed on the hub and on the flexible structures of the spacecraft.

关键词： Flexible Structures Spacecrafts distributed parameter system Attitude Control Actuators Sensors Feedback Control Riccati Equations Reaction Wheels Ground Control Station

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