A large-diaphragm piezoelectric panel loudspeaker and its acoustic frequency response simulation method

Abstract

The authors applied the Finite Element Method (FEM) to analyze the electro-mechanical transformation and micro dynamical characteristics of a piezoelectric panel loudspeaker with triple layered piezoelectric ceramic slices in 2×2 rectangular arrangements. According to the simulated micro-vibration data, the authors built an acoustic analysis model combined with a linear superposition method to rapidly obtain the Sound Pressure Level (SPL) frequency response. FEM calculations of resonant modes, resonant frequencies, and the amplitude at the center of the diaphragm were in good agreement with measured values. The measured SPL frequency response agreed with the simulation, supporting the FEM model and the SPL frequency response calculation method proposed in this paper. In addition, an improved structure by addition of an elastic mat was illustrated and demonstrated to provide a smoother low-frequency SPL frequency response verified by both measurement and simulation methods.