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Noise reduction using smart panel with shunt circuit

In this paper, piezoelectric smart panels featuring shunt damping are designed and tested for broadband noise reduction. Electrical admittance is introduced to represent electro-mechanical characteristics of piezoelectric smart structures and to predict the performance of piezoelectric shunt damping as a design index of the system. The location and size of piezoelectric patches on the host panel are optimized by taking the admittance as a cost function and by using Taguchi method. The admittance is calculated by finite element method in the design stage and experimentally verified after the optimal configuration is found. Shunt performance of smart panel is realized by vibration reduction in frequency domain. In order to illuminate the effect of noise reduction in the shunt system, a standard test setup according to SAE J1400 is used to measure the transmission loss and sound pressure distribution for the smart panel. In this paper, a broadband shunt technique for increasing transmission loss is experimentally investigated.