The research of damped absorbing layer based on piezoelectric shunt

Abstract

Piezoelectric passive control is a piezoelectric shunt damping technology that utilizes the piezoelectric effect of a piezoelectric material to convert the mechanical energy generated by the structural vibration of a sound wave incident on a piezoelectric device into electrical energy. By connecting a shunt circuit in parallel with the piezoelectric device, the resistance in the shunt circuit converts the electric energy into heat energy so as to achieve the purpose of suppressing the structural vibration and improving the sound absorption performance. In the article, the negative capacitance is used to counteract the capacitive reactance of the piezoelectric film, increase the electromechanical coupling coefficient of the piezoelectric film and improve the controllability of the system. We also analyze when a rigid piezoelectric material connected to the back of piezoelectric damping material, the method can improve the efficiency of electrical-acoustic conversion, and enhance the sound absorption ability of the material. At the same time, this paper also studies the role of rubber damping material in the piezoelectric shunt damping sound absorption layer, designed a sound absorbing structure with wide frequency range and high absorption coefficient.