Simulation Method of Acoustic Emission Module in Acoustic-Seismic Coupling Detection

Acoustic-seismic coupling detection for flexible shallow buried objects has a good application prospect in military, architecture, archaeology and other fields because of its non-damage characteristics. However, due to the emission demands of high-power and low-frequency acoustic waves, the work noise is loud in the detection process, and the utilization efficiency of acoustic energy is low. An effective simulation method for the acoustic emission module is required to support subsequent improvements in the acoustic-seismic coupling detection. In this paper, a high-power speaker used in traditional acoustic emission module was taken as an example, and the structural modeling and the multi-physical field coupling simulation were carried out. Through the equivalent circuit method and the finite element method, the frequency response characteristics of speaker in low frequency band were restored, and the acoustic modal of the back cavity was analyzed. The acoustic characteristic curve obtained by simulation matched well with the experimental data. Therefore, the simulation method proposed in this paper can be adopted in the analysis of acoustic emission module in acoustic-seismic coupling detection.