Analysis and Simulation for Decoupler-Cage Hitting Noise of Hydraulic Mounts 2023-01-1151

In order to study the influence of the decoupler structure on the hitting noise of the hydraulic mount, the abnormal noise of the hydraulic mount was transformed into the collision impact between the decoupler and the cage, and the hitting noise was simulated and evaluated using acoustic theory analysis software. In this paper, a finite element model of the collision impact between the decoupler and the cage is developed, and an explicit finite element analysis is performed to obtain the time history of the vibration acceleration of the model, which is used as the boundary condition of the acoustic simulation. Acoustics analysis software and the acoustic boundary element method are used to analyze the impact noise of the decoupler-cage, and the frequency domain distribution characteristics of the impact sound pressure are obtained. The influence of different decoupler structure on the hitting noise is studied, and the recommended values for each parameter for a structure are given. According to this modeling and analysis method, the structure of a decoupler with hitting noise is improved, and the design is validated to solve the problem of abnormal noise of the hydraulic mount.