The results of an investigation for the active cancellation of residual vibrations originating from the engine in a passenger car with piezoceramic actuators are presented. For this purpose, thin piezoceramic plate actuators were applied to an engine crossmember to induce shear forces that counteract the residual vibrations coming from the engine. The bending-mode vibrations of this structure element in the vehicle were actively suppressed. The optimal application points for the actuators were determined through modal analysis and operational deflection shape analysis. From these experiments, the undesired vibrations could be found to be at around 80 to 180 Hz. Different arrangements and shapes of the plate actuators were experimentally tested on the structure. The most effective combination was determined by comparing the acceleration amplitude generated by the piezoceramic actuators at 80 and 180 Hz, respectively, with the spectral content of the engine-induced acceleration at these frequencies. It was found that especially in the higher frequency range (180 Hz) the piezoelectric structure was able to counteract the residual vibrations coming from the engine. A control system was developed that was implemented and tested successfully in the vehicle.
Active cancellation of structure borne engine vibrations in passenger cars with thin piezoceramic plate actuators
Aktive Beseitigung von Motorkörperschwingungen in Personenkraftwagen mit Hilfe von dünnen Piezokeramikplattenaktoren
2002
4 Seiten, 7 Bilder, 14 Quellen
Conference paper
English
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