船用柴油机连杆结构有限元分析  

Finite element analysis on connecting rod of marine diesel engine

作　　者：胡安元 刘利军 张琼宇[2] 王奎[2] 

机构地区：[1]沪东重机有限公司技术中心,上海200129 [2]江苏科技大学机械工程学院,江苏镇江212000

出　　处：《计算机辅助工程》2013年第A02期264-268,共5页Computer Aided Engineering

摘　　要：对一种新型连杆进行结构有限元及疲劳分析,计算连杆在不同载荷下的变形以及应力分布,进而得到连杆的疲劳安全因数.通过动力学计算求得连杆在上止点时小端的受力,并得出连杆相对于曲柄销中心的加速度和旋转角速度.基于Abaqus对连杆的1/4模型进行静力学计算,得到连杆的轴向变形量、应力以及接触面的接触压力.对所有节点在所有工况下的等效应力进行组合分析,求得每个节点的最大应力幅值,而后得到连杆的疲劳安全因数.连杆的最大压缩量小于1.14 mm,最大伸长量小于0.86 mm,最大主应力、接触压力小于材料的屈服极限,疲劳安全因数大于2.14,因此该连杆满足设计要求.The finite element fatigue analysis is applied to a new type engine, which calculates deformation and stress of connecting rod, as well as fatigue safety factor. The force at small end of conrod is obtained by dynamics analysis, and furthermore, the acceleration and angular velocity of conrod about center line of crank pin are obtained. The axial deformation, stress distribution and contact press results from the static analysis on 1/4 conrod model based on Abaqus. All nodes under different load cases are analyzed to calculate the stress amplitudes and fatigue factor. The results show that, the maximum compression and elongation of conrod are less than 1.14 mm and 0.86 mm respectively, the maximum principal stress and contact stress are less than the yield limit of the material, and the fatigue safety factor is more than 2.14. The new type of connecting rod can satisfy the design requirements.

关 键 词：船用柴油机 动力学计算 结构有限元分析 疲劳分析 

分 类 号：U664.121[交通运输工程—船舶及航道工程] TB115.1[交通运输工程—船舶与海洋工程]