Wyniki wyszukiwania - BazTech

1

Vibration control in a pitch-plane suspension model with MR shock absorbers

Sapiński B., Martynowicz P.

Journal of Theoretical and Applied Mechanics

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2005

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Vol. 43 nr 3

655--674

EN

The paper is concerned with the experimental study of vibration control in a suspension equipped with independently controlled magnetorheological shock absorbers (MRAs) in front and rear sections. For research purposes, the pitch-plane suspension model with bounce and pitch motions was considered. This suspension model was tested in open-loop and feedback system configurations under harmonic and square excitations. The experiments were conducted on a specially designed experimental setup with a data acquisition and control system configured in the MATLAB/Simulink environment. The obtained results reveal effectiveness of MRAs for vibration suppression in the investigated suspension model.

PL

W artykule przedstawiono analizę eksperymentalną sterowania drganiami zawieszenia z dwoma niezależnymi amortyzatorami magnetoreologicznymi. Do analizy wykorzystano model zawieszenia w płaszczyźnie przechyłów wzdłużnych, posiadający dwa stopnie swobody (ruch pionowy i przechył wzdłużny). Model ten zbadano w układach otwartym i zamkniętym przy harmonicznych oraz prostokątnych wymuszeniach kinetycznych. Eksperymenty przeprowadzono na wykonanym według własnego projektu stanowisku badawczym przy użyciu środowiska pomiarowo-sterującego MATLAB/Simulink. Wyniki pomiarów potwierdziły skuteczność stewwania drganiami za pomocą amortyzatorów magnetoreologicznych w rozważanym układzie zawieszenia.

2

Comparison of Linear Control Methods for an AMB System

Grega W., Piłat A.

International Journal of Applied Mathematics and Computer Science

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2005

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Vol. 15, no 2

245-255

EN

The contactless nature of active magnetic bearings brings about many advantages over the conventional bearing while industrial real-time applications are often limited by the significant complexity of control algorithms. This paper presents the application of an LQ controller to an active magnetic bearing system (AMB). Two control strategies are presented and compared: local and global. In the first case the rotor is modelled as two separated masses located at the bearing. In the second case rotor stabilization is considered globally as a problem of the rotating rigid body suspended in a magnetic field. The second approach is especially important for high-speed rotating machines. The control performance of both algorithms was analysed using an experimental AMB laboratory system.

3

Feedback control for discrete descriptor systems

Kurina G.A.

Systems Science

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2002

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Vol. 28, nr 2

29-40

EN

The control in the feedback form and the optimal cost are obtained for four linear-quadratic control problems by discrete descriptor systems in a Hilbert space. Special solutions of the implicit operator Riccati equations used here act in all state space and in general case they are not nonnegative definite, unlike the operators in the subspace and the nonnegative definite solutions. The examples show that the operator Riccati equations considered have no nonnegative definite solutions though the corresponding optimal control problems have the unique solutions.