基于有限元的某柴油机主轴承壁结构优化

Structural Optimization of Main Bearing Wall of a Diesel Engine Based on Finite Element Analysis

基于接触滑移和轴瓦过盈模型,选取典型特征工况并施加动力学轴承载荷,对某柴油机进行有限元机体应力分析和主轴承壁高周疲劳分析;根据模型的仿真分析结果对机体的部分结构进行优化设计,更改主轴承盖螺栓孔与机体螺栓孔的直径和相对位置,增加主轴承盖与机体的接触面积。结果表明:优化后的机体主轴承壁应力分布情况得到了改善,主轴承盖与机体接触面的疲劳系数明显降低。

Considering contact slip and bearing interference model, typical working conditions are selected and dynamic bearing loads are applied to analyze the body stress and the high-cycle fatigue of the main bearing wall of a diesel. The optimization design of the structure of parts is carried out based on the analysis results. The diameter and relative position of the bolt hole of the main bearing cover and the bolt hole of the body are changed to increase the contact area between the main bearing cover and the body. The results show that the stress distribution of the main bearing wall is improved, and the fatigue coefficient of the contact surface between the main bearing cover and the engine body is obviously reduced.