Negative capacitance shunts for vibration control and suppression of reactive input power on rectangular panels

摘要

Piezoelectric patches shunted with a negative capacitance circuit represent an effective broadband active control methodology. Recent developments have shown that a wave-based timing of such shunts applied to beams yields varying levels of control depending upon the configuration, with the most effective configuration being that of a shunt at the root of the beam. That configuration yielded effectively an anechoic termination. The effectiveness of the different configurations may be interpreted through their ability to couple to and suppress the reactive input power delivered by a point excitation, as is demonstrated in this paper. The reactive input power suppression concept is extended to the case of vibration suppression on a rectangular panel, and is shown to predict significant vibration suppression capability.