Research on vibration and acoustic radiation of planetary gearbox housing

In this paper, an analysis model of planetary gearbox housing is constructed based on finite element method/boundary element method (FEM/BEM). Its vibration and acoustic radiation characteristics are investigated. Firstly, the finite element model is established using ABAQUS. The main factors affecting its dynamic characteristics are observed through modal analysis. Then impact of main structural parameters on transmission characteristics is investigated. Secondly, the acoustic radiation analysis model is established using VA-One on the basis of vibration characteristics analysis. Acoustic pressure nephogram,noise spectrum, noise radiation and modal contribution of housing surface are obtained through the numerical analysis. The effects of main structure parameters on noise radiation characteristics are observed. It is shown that the rigidity of the front and back plate is weaker than the circumferential rigidity of the housing. However, reinforcing the local thickness of the front and back plate cannot improve the dynamic characteristics due to the effect of shafting in the gearbox housing. Finally, acoustic protection of the housing is carried out. It can be observed that changing the loss factor can effectively reduce the noise of the housing structure. This investigation can provide technical support on the scheme design of the planetary gearbox housing.