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检索条件"任意字段=Symposium on Nonlinear Control and Observer Design: From Theory to Applications, 2005"

共 211 条记录，以下是141-150 订阅

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Remarks on moving horizon state estimation with guaranteed convergence

Remarks on moving horizon state estimation with guaranteed c...

引用

symposium on nonlinear control and observer design

作者： Raff, T Ebenbauer, C Findeisen, R Allgöwer, F Univ Stuttgart Inst Syst Theory Engn Stuttgart Germany

ISBN: (纸本)3540279385

In this paper, a moving horizon state estimation scheme is proposed. The scheme is inspired by combining the system-theoretic concept of observability maps with optimization-based estimators. As a result, a simple moving horizon state estimator scheme for nonlinear discrete time control systems is established which guarantees global convergence tinder certain observability conditions.

关键词： moving horizon state estimator optimization-based estimator nonlinear discrete time control system inverse problem observability

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Infinite-dimensional decoupling control of the tip position and the tip angle of a composite piezoelectric beam with tip mass

Infinite-dimensional decoupling control of the tip position ...

引用

symposium on nonlinear control and observer design

作者： Kugi, A Thull, D Univ Saarland Chair Syst Theory & Automat Control D-6600 Saarbrucken Germany

ISBN: (纸本)3540279385

This contribution is devoted to the infinite-dimensional control of a multi-layered piezoelectric cantilever with a tip mass. Thereby, the design of the layer structure, in particular of the piezoelectric actuator and sensor layers, is considered as a part of the controller design. The control objective is to provide two independently controllable degrees-of-freedom for the tip mass in form of the tip position and the tip angle. The control concept being proposed consists of all open-loop flatness-based tracking controller and a linear dynamic feedback controller in order to asymptotically stabilize the closed-loop error system. A rigorous stability proof based on the C-0-semigroup theory and on LaSalle's invariance principle for infinite-dimensional systems will be given. Finally, simulation results demonstrate the potential of this smart actuator.

关键词： piezoelectric structure shape design infinite-dimensional control flatness asymptotic stability

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control of switched reluctance servo-drives

Control of switched reluctance servo-drives

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symposium on nonlinear control and observer design: from theory to applications, 2005

作者： Fehn, Achim A. R. Rothfuß, Ralf Robert Bosch GmbH CS/ESM P.O. Box 1355 Heilbronn74003 Germany

ISBN: (纸本)3540279385

The presented model-based solution for the tracking control of switched reluctance (SR) servo-drives is an outcome of its differential flatness. The controller shows a cascade structure as commonly used in drive engineering. The main difficulty by exploiting the flatness property for the control of SR drives is the calculation of the desired trajectories for the phase currents. This problem is solved by means of smooth reference surfaces, which are determined on the basis of the machine’s magnetic characteristics. Experiments illustrate the good performance of the designed control scheme. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Navigation

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Least squares smoothing of nonlinear systems

Least squares smoothing of nonlinear systems

引用

symposium on nonlinear control and observer design: from theory to applications, 2005

作者： Krener, Arthur J. Department of Mathematics University of California DavisCA95616 United States

ISBN: (纸本)3540279385

We consider the fixed interval smoothing problem for data from linear or nonlinear models where there is a priori information about the boundary values of the state process. The nonlinearities and boundary values preclude a stochastic approach so instead we use a least squares methodology. The resulting variational equations are a coupled system of ordinary differential equations for the state and costate involving boundary conditions. If the model is linear and the a priori information is only about the initial state then several authors have given methods for solving the resulting equations in two sweeps. If the model is linear but the a priori information is about both the initial and final states then direct methods have been proposed. If the state dimension is large these methods can be very expensive and moreover they don’t readily generalize to nonlinear models. Therefore we present an iterative method for solving both linear and nonlinear problems. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Iterative methods

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nonlinear flow control based on a low dimensional model of fluid flow

Nonlinear flow control based on a low dimensional model of f...

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symposium on nonlinear control and observer design: from theory to applications, 2005

作者： King, Rudibert Seibold, Meline Lehmann, Oliver Noack, Bernd. R. Morzyński, Marek Tadmor, Gilead Measurement and Control Group Berlin University of Technology Germany Hermann-Föttinger-Institut Berlin University of Technology Germany Institute of Combustion Engines and Transportation Poznań University of Technology Poland Department of Electrical and Computer Engineering Northeastern University Boston United States

ISBN: (纸本)3540279385

nonlinear control design is shown to be a critical enabler for robust model-based suppression of a flow instability. The onset of oscillatory vortex shedding is chosen as a well investigated benchmark problem of flow control. A low-dimensional Galerkin model using a Karhunen-Loève decomposition of the flow field is adopted from earlier studies of the authors as a control-oriented fluid flow representation. Several strategies of nonlinear controller design are employed, both, to the Galerkin model and to the flow via a direct numerical simulation of the Navier-Stokes equations (NSE). The aim is to find methods which respect the validity of low order models. Examples are formal methods such as input-output linearization, Lyapunov-based, backstepping controllers etc., and physically motivated controllers. Whereas the first test-bed is easily mastered by the formal methods, the application to the NSE is more critical, due to robustness issues. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Navier Stokes equations

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Application of vibration control in steel industries

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International symposium on Vibration control of nonlinear Mechanisms and Structures

作者： Schlacher, K Grabmair, G Holl, J Univ Linz Christian Doppler Lab Automat Control Mechatron S A-4040 Linz Austria

ISBN: (纸本)1402041608

In steel industry, the high quality requirements of rolled products, in particular the restrictive thickness tolerances, mean a challenging task also from a control point of view. One of the key problems in this context are vibrations of the rolling plant. Therefore, this contribution is concerned with the active rejection of two common vibration problems, namely vibrations of so-called wrapper rolls and the chatter phenomenon. A mathematical model based on physical considerations taking into account the essential nonlinearities of the plant provides the basis for the controller design. For vibration rejection two nonlinear control concepts based on energy considerations and the theory of differential flatness are presented.

关键词： steel industry model-based control nonlinear control vibration rejection

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Active and semi-active control of electrorheological fluid devices

引用

International symposium on Vibration control of nonlinear Mechanisms and Structures

作者： Kugi, A Holzmann, K Kemmetmüller, W Univ Saarland Chair Syst Theory & Automat Control D-66123 Saarbrucken Germany

ISBN: (纸本)1402041608

This paper is devoted to two different applications of electrorheological (ER) fluid devices. The first application deals with the modeling and nonlinear control of an active actuator consisting of a double-rod cylinder and four ER valves arranged in a full bridge configuration. Secondly, a semi-active shock absorber system is designed by utilizing the special properties of ER valves. The latter application is also intended to demonstrate the benefits of a mechatronic design approach, where the control strategy and the system components are designed simultaneously. Measurement results prove the feasibility of the proposed ER devices.

关键词： electrorheological fluids ER actuator ER shock absorber active and semi-active control nonlinear control

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Optimal control of piecewise affine systems: A dynamic programming approach

Optimal control of piecewise affine systems: A dynamic progr...

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symposium on nonlinear control and observer design: from theory to applications, 2005

作者： Christophersen, Frank J. Baotić, Mato Morari, Manfred Automatic Control Laboratory ETH Zentrum Physikstrasse 3 ETL K13.1 ZürichCH –8092 Switzerland Faculty of Electrical Engineering and Computing University of Zagreb Unska 3 ZagrebHR - 10000 Croatia

ISBN: (纸本)3540279385

We consider the constrained finite and infinite time optimal control problem for the class of discrete-time linear piecewise affine systems. When a linear performance index is used the finite and infinite time optimal solution is a piecewise affine state feedback control law. In this paper we present an algorithm to compute the optimal solution for the finite time case where the algorithm combines a dynamic programming exploration strategy with multi-parametric linear programming and basic polyhedral manipulation. We extend the ideas to the infinite time case and show the equivalence of the dynamic programming generated solution with the solution to the infinite time optimal control problem. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Hybrid systems

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Sensorless control of interior permanent-magnet synchronous motors based on a fictitious permanent-magnet flux model

Sensorless control of interior permanent-magnet synchronous ...

引用

40th Annual Meeting of the IEEE-Industry-applications-Society

作者： Koonlaboon, S Sangwongwanich, S Walailak Univ Sch Engn & Resources Thasala 80160 Thailand

ISBN: (纸本)0780392086

Due to the saliency of the IPMSM, the model-based adaptive observer used in the sensorless control is nonlinear and difficult to analyze. With the extended EMF concept, the model though becomes partly linear, the extended EMF dynamic itself is very complicated making the application of an adaptive full-order observer troublesome. This problem is eliminated with a fictitious permanent-magnet flux model newly proposed in this paper for the IPMSM, because it converts the IPMSM into an equivalent SPMSM. The new model is simple, approximately linear and allows the adaptive observer algorithm to be applied easily. Also, the EMF induced by the fictitious magnet flux is exactly the fictitious EMF of the phasor diagram of the synchronous machine's two-reaction theory found in electrical machine textbooks. The initial rotor position can also be estimated easily from this fictitious EMF which always points in the d-axis at standstill. A novel sensorless scheme based on the proposed model is constructed, and its stability conditions are derived analytically to give design guidelines. Experiment results are given to verify the theoretical results.

关键词： Synchronous motors

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New nonlinear observer design with application to electrostatic micro-actuators

New nonlinear observer design with application to electrosta...

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ASME International Mechanical Engineering Congress and Exposition

作者： Durbha, Venkat Balakrishnan, S. N. Univ Missouri Rolla MO 65401 USA

ISBN: (纸本)9780791842164

In many practical applications it is not possible to measure all the states required to control the system. In such instances observer/filter is used to give a good estimate of the states of the system. The objective of the observer is to estimate the states such that the error between the actual and computed measurements goes to zero and obtain the "best" estimates of the states of a given system. In the current study a new nonlinear observer structure is proposed. The development of the observer is based on optimal control theory. A cost function is defined in terms of the measurement residual and the magnitude of correction term. The observer gains are obtained by minimizing the cost function with respect to the magnitude of corrections. The proposed observer is used to estimate the states of a one-dimensional electrostatic micro-actuator. The states of the actuator dynamics are, charge on the capacitor plates, the distance between the plates and the relative velocity between the plates. The regulation of the actuator states to desired trajectories is achieved through optimal control based state feedback. However in practice it is very difficult to measure the relative position and velocity of the plates. In this paper optimal feedback control based on the state estimates provided by the observer is used to regulate the actuator states to the desired location.

关键词： Electrostatic actuators

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