Acoustic propagation simulation of closed cavity with obstacles based on finite volume method

The propagation characteristics of sound in different cavities and cavity tube combinations are different. With reasonable design, sound will be dissipated in it to achieve noise elimination effect.Therefore, it is beneficial to optimize the structure design distribution to explore the sound field distribution inside the mechanical structure, so as to minimize the transmitted sound through the wall.Therefore, this paper mainly discusses the sound field distribution in closed cavity and the influence of obstacles on it, providing theoretical guidance for sound insulation design. Firstly, the advantages and disadvantages of different numerical simulation methods are discussed, and the feasibility of finite volume method in acoustic numerical simulation is expounded by comparing the methods used in commercial software. Secondly, based on the FVM, the influence of the location and number of obstacles in the closed cavity on the sound field distribution is emphatically analyzed. The simulation results show that acoustic waves are easy to overlap near obstacles with reflection boundaries. When the number of obstacles increases, the higher-order natural frequency increases. Therefore, in the internal design of the equipment, different sound absorbing materials can be laid on the internal obstruction to reduce the sound wave reflection.