基于NSGA-Ⅱ的柴油机主轴承组合结构可靠性提升措施研究  

Research on reliability improvement measures of main bearing assembly structure of diesel engine based on NSGA-Ⅱ

作　　者：赵鑫[1] 刘晓勇 苏铁熊[1] 任日娜 郭亚新 ZHAO Xin;LIU Xiaoyong;SU Tiexiong;REN Rina;GUO Yaxin(College of Mechatronic Engineering,North University of China,Taiyuan 030051,China;School of Energy and Power Engineering,North University of China,Taiyuan 030051,China;School of Mechanical Engineering,North University of China,Taiyuan 030051,China;SVOLT Energy Technology Co.,Ltd.,Baoding 071000,China)

机构地区：[1]中北大学机电工程学院,太原030051 [2]中北大学能源动力工程学院,太原030051 [3]中北大学机械工程学院,太原030051 [4]蜂巢能源科技有限公司,保定071000

出　　处：《现代制造工程》2022年第12期100-110,共11页Modern Manufacturing Engineering

基　　金：山西省基础研究计划资助项目(20210302123072)。

摘　　要：针对柴油机功率密度提升带来的主轴承组合结构强度、刚度和接触强度等方面可靠性下降的问题,基于主轴承组合结构典型设计参数对可靠性考察指标的影响规律,提出了主轴承组合结构可靠性提升的有效措施。基于快速非支配排序遗传算法(NSGA-Ⅱ)对主轴承组合结构进行多目标优化,确定了结构改进设计方案并进行了试验验证。结果表明,增加机体隔板厚度、主轴承盖厚度及侧壁加强筋厚度是提高强度可靠性的有效措施;增加螺栓预紧力是改善主轴承孔刚度可靠性的有效措施;增加主轴瓦装配过盈量是提升接触强度可靠性的有效措施。优化后,机体及主轴承盖强度危险区域的第一主应力分别下降了15.28%和8.26%;主轴承孔失圆度、机体与主轴承盖端面最大接触压力均降低了14.13%。Aiming at the problem of reliability degradation in many aspects such as strength, stiffness and contact strength of main bearing assembly structure brought by the increase of power density of diesel engine, the effective measures for reliability improvement were proposed based on the influence law of typical design parameters on reliability inspection index.The multi-objective optimization for the main bearing assembly structure was carried out based on NSGA-Ⅱ. An improved design scheme was determined by optimization, and the improved scheme was experimentally verified.The results show that increasing the thickness of the partition of the engine block, the thickness of the main bearing cap and the thickness of the side wall stiffener was an effective measure to improve the strength.Increasing the preload of bolts was an effective measure to improve the stiffness of the main bearing hole.Increasing the interference of the main bearing bush was an effective measure to improve the contact strength.After optimization, the stresses of the strength danger area of the engine block and the main bearing cap decreased by 15.28 % and 8.26 % respectively. The out-of-roundness of the main bearing hole and the maximum contact pressure on the surface between the engine block and the main bearing cap were reduced by 14.13 %.

关 键 词：主轴承组合结构 可靠性提升 快速非支配排序遗传算法 多目标优化 

分 类 号：TK426[动力工程及工程热物理—动力机械及工程]