Improved half-space frequency averaged quadratic pressure method for calculating the pressure radiated from frequency band vibrating bodies in half space

In order to calculate the acoustic radiation from frequency band vibrating bodies in half space, we propose the improved half-space FAQP(Frequency Averaged Quadratic Pressure) method based on energy sources to calculate the pressure radiated from frequency band vibrating bodies and obtain a unique solution for radiation at irregular frequencies. Numerical results of a pulsating sphere under a rigid surface and a pulsating hemisphere sitting on a free surface with bandwidth Δf=4 Hz show that the validity of the improved half-space FAQP method for solving the non-uniqueness problem is verified. And numerical results of a pulsating sphere under a rigid surface and a pulsating hemisphere sitting on a free surface show that, compared with the conventional BEM, improved half-space FAQP method can have much higher accuracy and is more suitable for high frequency calculation.