This paper presents experimental results on the implementation of switching and sweeping pi-ezoelectric patch vibration absorbers to control the flexural response of a thin rectangular pan-el. The panel is equipped with five piezoelectric patches, which are connected to time-varying RLC-shunts. The inductive and resistive elements of the shunts are varied according to two laws. In the first one, they are iteratively commuted over a given set of values to cyclically control the resonant response of target flexural modes of the panel. In the second one, they are uniformly varied within specific ranges in such a way as to periodically control the reso-nant response of all flexural modes of the panel resonating in a given frequency band. The shunts include also a negative-capacitive active component, which is used to compensate the capacitive effect of the piezoelectric patches and thus to increase the control effectiveness of the shunts. The speed of the switching events or periodic sweeps are selected in such a way as the piezoelectric patch vibration absorbers can effectively control the response of the panel. The study shows that both switching and sweeping operation modes reduce the resonance peaks of either the targeted modes or the modes resonating in the target frequency band by values comprised between 3 and 15 dB.

Experimental implementation of switching and sweeping piezoelectric patch vibration absorbers

DAL BO, LORIS;GARDONIO, Paolo
2017-01-01

Abstract

This paper presents experimental results on the implementation of switching and sweeping pi-ezoelectric patch vibration absorbers to control the flexural response of a thin rectangular pan-el. The panel is equipped with five piezoelectric patches, which are connected to time-varying RLC-shunts. The inductive and resistive elements of the shunts are varied according to two laws. In the first one, they are iteratively commuted over a given set of values to cyclically control the resonant response of target flexural modes of the panel. In the second one, they are uniformly varied within specific ranges in such a way as to periodically control the reso-nant response of all flexural modes of the panel resonating in a given frequency band. The shunts include also a negative-capacitive active component, which is used to compensate the capacitive effect of the piezoelectric patches and thus to increase the control effectiveness of the shunts. The speed of the switching events or periodic sweeps are selected in such a way as the piezoelectric patch vibration absorbers can effectively control the response of the panel. The study shows that both switching and sweeping operation modes reduce the resonance peaks of either the targeted modes or the modes resonating in the target frequency band by values comprised between 3 and 15 dB.
2017
978-1-906913-27-4
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11390/1118677
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