基于显式动力学的某变速器振动噪声分析

基于显式动力学方法，利用LS_DYNA对某变速器各轴系的振动进行了动力学分析.建立各轴系动力学有限元模型，获取了各轴系轴承部位的动态激励.在此基础上，利用边界元法对轴承激励下的变速器壳体边界元模型的振动噪声进行分析，获取了壳体表面的噪声分布，为变速器的噪声分析提供了一种新方法.计算结果表明，主要的辐射噪声集中在主减速器和变速器支承轴端区域，应在壳体侧面增设加强筋，或者增加现有加强筋厚度来降低壳体的噪声水平.

Vibration Noise Analysis of Transmission Based on Explicit Dynamics

Using LS_DYNA， the finite element models of all shafts were established. Based on explicit dynamic method， the shaft vibrations were analyzed and the dynamic excitations of bearing parts were obtained. On these bases， the vibration noise of the boundary element model of the transmission shell was analyzed under bearing excitations and the surface noise distribution was obtained using the boundary element method. Thus a new method of the noise analysis for transmission was provided. The results show that the radiation noise mainly focuses on the differential and parts of the rolling bearing. To reduce the noise level， reinforcements should be added on the shell side or the thickness of the existing reinforcements should be increased.