Sound field analysis of the gearbox based on fast multipole boundary element method

The gearbox is a key component widely used in construction machinery, and the accurate simulation of its radiation sound field plays an important role in subsequent noise reduction optimization design. The boundary element method (BEM) is very suitable for analyzing the acoustic radiation problem in the infinite domain. But, the conventional boundary element method (CBEM) has the disadvantages of low computational efficiency and high memory consumption. In this study, a wideband fast multipole boundary element method (FM-BEM) is developed and used to calculate the sound pressures at certain field points and the spatial distribution of the radiation sound field of gearbox at a certain frequency. By comparing the computational results of commercial software, the accuracy of the FM-BEM is verified. Moreover, the multi-core parallel computing method can accelerate the frequency sweeping analysis to obtain the frequency sweeping results of the radiation sound field of gearbox quickly and accurately.