某型船用低速柴油机机座推力侧分析

Analysis of Bedplate Thrust Side of One Type of Low-speed Marine Diesel Engine

某型船用低速柴油机在改型设计过程中,由于推进载荷的增加,需要对机座推力侧重新进行结构强度校核。根据动力学软件Virtual Engine计算结果提取主轴承载荷,采用ABAQUS进行结构强度分析,由于轴向推力的作用,机座推力侧有6个区域应力集中,其中2个区域最大等效应力远超出材料的屈服强度,原结构不能满足改型设计要求。根据强度分析结果并结合工程应用经验,提出4种结构优化方案,经过再次计算发现改变危险区域隔板布置角度最为合理,并得到了最佳布置角度。

In a type of low-speed marine diesel engine retrofit design process, due to the increasing advanced loading, the bedplate thrust side structural strength need to be rechecked. The loads are calculated by the dynamic software Virtual Engine, and the structural strength is analyzed by ABAQUS. The results show that, there are six areas of stress concentration of the bedplate thrust side, and the maximum equivalent stress of two regions exceeds the material yield strength. Thus the original structure cannot meet the requirements of the retrofit design. On the basis of the strength analysis results and the engineering application experience, four optimization schemes are put forward, and the most reasonable scheme is to change the angle of the plate layout in weak areas. The best angle of the plate layout is obtained.