This paper deals with the experimental modal analysis of an actively controlled scaled laboratory model of a flexible metro vehicle car body. To investigate such a control system a 1/10-scaled laboratory model of a metro vehicle car body has been built. Control forces are applied to the structure by two piezoelectric stack actuators mounted in specially designed consoles, which are bonded to the side members of the structure. The car body itself is suspended in a test bed frame by four coil springs to obtain a free-free suspension configuration. An electrodynamic shaker is used to generate broad band excitation forces, which in real operation enter the structure at the application points of the secondary suspension system. The state feedback controller and the observer are designed by an LQR-based modal weighting procedure implemented in Matlab/SIMULINK. To investigate the reduction of the amplitudes of the shaker induced vibrations a non-contact measurement utilizing a laser scanning vibrometer is applied. In order to verify the achieved performance, open and closed loop disturbance-displacement transfer functions and the mode shape corresponding to specific natural modes are identified by an experimental modal analysis. Since the ride quality is mainly influenced by the lowest global vibration modes, the investigation is focused on the first torsional mode and a low vertical bending mode of the car body.
Experimental modal analysis of an actively controlled scaled metro vehicle car body
2007
8 Seiten, 7 Bilder, 7 Quellen
(nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
Experimental Modal Analysis of an Actively Controlled Scaled Metro Vehicle Car Body
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