某船用柴油机机体主轴承壁的有限元分析和结构优化

考虑接触滑移模型,选取典型特征工况并耦合映射动力学轴承载荷,开展了轴承孔的变形分析以及结合面的相对滑移和主轴承壁的高周疲劳分析;以此为依据对某直列8缸船用柴油机的机体主轴承壁结构进行了优化设计。结果表明:优化后的主轴承壁的刚度得到明显改善,主轴承孔变形更为均匀,机体和主轴承盖结合面的相对接触滑移得到进一步减小,降低了微动疲劳磨损的风险。

Finite Element Analysis and Structural Optimization of Main Bearing Blockfor a Marine Diesel Engine

Considering contact slip model, analysis was carried out on the deformation of bearing holes, relative slip of faying face and high cycle fatigue of main bearing block as selecting the typical working condition and mapping dynamic bearing load. Based on the analysis results, structure optimal design was carried out on the main bearing block of a 8-cylinder in line marine diesel engine, which showed that the stiffness of the main bearing block was obviously improved, the deformation of bearing hole was more even, the relative contact slip between engine block and main bearing cap faying face became smaller, thus reduced the risk of fretting fatigue wearing.