Sound energy control of semi-active piezoelectric composite level-based system

This paper mainly talks about the physical model of rubber/PVDF semi-active piezoelectric composite level-based system, and the calculation method of sound energy loss of the system is studied too. The principle of impedance matching in piezoelectric layer, and the implementation method of connecting piezoelectric layer with an external loss circuit (negative component circuit). By simulation, the system of PVDF layer connected with an external loss circuit is simplified as RC series circuit. Considering sound absorption, the performance of this system is better than the same thick rubber in each frequency channel. Finally, the methods to improve the absorption properties of this system is given.