The possibility of sound absorbing by a vibrating plate with piezoelectric material shunted with passive electrical circuit is investigated. Using Lagrange's approach, a governing equation for the flexural vibration of the plate attached with piezoelectric wafer shunted with RL circuits is derived. As a consequence, the effective mechanical impedance for the corresponding plate is obtained. A measurement based on an impedance tube is also conducted to gauge the influence of the shunting RL circuits on the sound absorption. Good agreements achieved when the measured sound absorption coefficients are compared with the calculations from the mathematics model established in this paper.
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