Simulation analysis and verification of the directivity of spherical arrays towards low-frequency signals

Abstract Due to the scarcity of data analysis on receiving low-frequency signals with conventional arrays and the difficulty of processing low-frequency signals with conventional arrays in practical environments, this paper utilizes the theory of spherical acoustic scattering normal mode solution to simulate the sound field intensity on the surface of a sphere with different frequencies and boundary conditions, and compares the simulation results with experimental data. The results show that the elastic sphere model is relatively close to the actual situation at lower frequencies, but cannot be approximated by an elastic model at higher frequencies. Furthermore, at lower frequencies, the peak of the directional pattern is in the opposite direction to the incoming wave. The research results can provide some reference for improving the directional ability of conventional spherical arrays towards low-frequency signals.