Abstract
This paper describes an air spring cancellation method using a piezoelectric element and negative capacitor. Because the air space of the double-leaf wall functions as an air spring, the sound insulation effect is decreased at around natural frequencies of the double-leaf wall. In this study, the air spring is cancelled by the negative stiffness using piezoelectric elements and negative capacitor. The governing equations of the analytical model were formulated, and the optimum values of negative capacitance were derived. The effectiveness of the proposed method and theoretical analysis was verified through simulations and experiments.
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