Sound and vibration control tests of Composite panel using piezoelectric sensors and actuators

摘要

We are carried out the tests for the sound and vibration control of the CFRP square panel. 500Hz bandwidth noise through two speakers is applied to the CFRP panel. Our objects are to improve the structural damping of the panel and attenuate the sound power radiated from the panel using piezoelectric sensors and actuators. The dimensions of the CFRP plate are 600.0 mm X 600.0mm in area and l.8mmt in thickness. Eighteen piezoelectric elements ( 40.0 X 20.0 X 0.3mmt) are bonded on the surface of the panel by epoxy adhesive. The panel is driven using some piezoelectric elements as actuators. The vibration of the panel is monitored using piezoelectric elements as sensors. We can get me strain of the panel from the voltage induced by piezoelectric elements. The signals are sent to digital signal processor (DSP) through filters and the control signal are sent to the power amplifiers. The amplified signals drive the piezoelectric actuators. The vibration and the radiated sound power of the panel are suppressed. We try to apply two methods for the control which are the gain control and the reduced LQG control. In the case of the gain control, the strain is reduced as much as 10-20 dB at some resonant peaks and the radiated sound pressure level as much as 1-15 dB. The radiated sound power is reduced by 1.59dB in the 0 - 500Hz frequency range. In the case of the LQG control, the strain is reduced as much as 7-10 dB at some resonant peaks and the radiated sound pressure level as much as 1-7 dB. The radiated sound power is reduced by 0.7dB in the 0 - 500Hz frequency range.