船用发动机连杆大端轴承润滑特性及损伤研究  

Research on Lubrication Characteristics and Damage of the Connecting Rod Big End Bearing of a Marine Engine

作　　者：周方贤 刘硕 李虎林 崔毅[1] 宋雅丽 屠丹红 ZHOU Fangxian;LIU Shuo;LI Hulin;CUI Yi;SONG Yali;TU Danhong(Key Laboratory for Power Machinery and Engineering of Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China;China Shipbuilding Power Engineering Institute Co.,Ltd.,Shanghai 200120,China)

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200240 [2]中船动力研究院有限公司,上海200120

出　　处：《内燃机工程》2024年第4期89-97,共9页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金面上项目(52171315)。

摘　　要：基于多柔体系统动力学和润滑理论,建立活塞–连杆–曲轴的多柔体摩擦动力学耦合模型。模型中采用绝对节点坐标框架分析多柔体动力学特性,采用平均雷诺方程和微凸体接触理论描述混合润滑和磨损特性,在空间、时间上分别采用有限元法和向后欧拉法求解。对某船用中速发动机连杆大端轴承的润滑、磨损和疲劳特性进行了计算分析。结果表明,轴承润滑域中心的轴颈–轴瓦相对速度呈现规律变化,混合润滑状态主要发生在燃烧上止点后90°附近;磨损集中在连杆轴承上瓦周向50°区域的两侧边缘位置,单循环最大磨损量为1.7×10~(-6)μm,是刚体模型的20.5倍,磨损寿命为1.1×10~4 h;疲劳损伤位置与易发生磨损位置相同,疲劳寿命为7.8×10~4 h。Based on the theories of flexible multibody system dynamics and lubrication,the coupling model of piston,connecting rod and crankshaft was established.In the model,the absolute node coordinate frame was used to analyze the dynamic characteristics of the flexible multi-body.The average Reynolds equation and the asperity contact theory were used to describe the mixed lubrication and wear characteristics.The finite element method and backward Euler method were used to solve the equations in space and time,respectively.The lubrication,wear and fatigue characteristics of the connecting rod big end bearing of a marine medium-speed engine were calculated and analyzed.The results show that the relative velocity of the journal and bearing bush in the center of the bearing lubrication domain change regularly,and the mixed lubrication state mainly occurs around 90°after the top dead center of the combustion.The wear is concentrated on the edges of both sides of the 50°circumferent region of the upper shell of the connecting rod bearing.The maximum single-cycle wear amount of the flexible model is 1.7×10-6μm,which is 20.5 times that of the rigid model,and the wear life is 1.1×104 h.The location of fatigue damage is the same as the location of wear,and the fatigue life is 7.8×104 h.

关 键 词：连杆大端轴承 混合润滑 磨损 疲劳 多柔体系统 有限元法 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]