Theoretical Research On Active Sound Absorption Of 1-3 Piezoelectric Composites Based On Equal Strain Model

Abstract

Based on the equal strain model of composite materials, the material properties of 1-3 piezoelectric composites are studied, and the active sound absorption property of 1-3 piezoelectric composites is studied by using piezoelectric shunt damping technology. According to the electromechanical relationship of the piezo-composites layer in vibration state and the sound transfer matrix of the medium, the research model is established. In this paper, the relationship between the material properties and the sound absorption property of 1-3 piezoelectric composites is studied, and the active sound absorption property of 1-3 piezoelectric composites is studied by using the negative capacitance and resistance circuit. The results show that: the material parameters of polymer phase in 1-3 piezoelectric composites and the thickness of the composite can affect the sound absorption property of 1-3 piezoelectric composites layer. However, due to the limitation of thickness in practical application, the effect of passive sound absorption of 1-3 piezoelectric composites in low frequency range is worse. The sound absorption property of 1-3 piezoelectric composites can be increased by external negative capacitance and resistance circuit. The absorption coefficient of 1-3 piezoelectric composites layer in low frequency and wide band range can be improved by piezoelectric shunt damping technology.