柴油机喷油泵传动轴防护罩断裂故障分析及优化

Analysis and optimization of fracture fault of transmission shaft shield of diesel engine fuel injection pump

为解决某船用柴油机喷油泵传动轴防护罩断裂故障,提升零部件可靠性,运用Hypermesh、Abaqus以及Femfat等仿真软件,对该喷油泵传动轴防护罩断裂故障产生的原因进行仿真分析。结果显示,防护罩断裂原因为一阶模态小于激振频率的1.2倍,易产生共振。在此基础上提出两种优化方案,对两种方案进行模态、强度及疲劳仿真计算。计算结果显示,在防护罩机体上多加2个M8固定螺栓,并将断裂位置处的倒角改成倒圆角后,其一阶模态大于激振频率的1.2倍,为优选方案。经试验验证,优化后的防护罩没出现断裂故障,优化方案及仿真结果正确可行。

In order to solve the failure of transmission shaft shield of a marine diesel engine fuel injection pump,the modal,strength and fatigue of the fracture transmission shaft shield are calculated by Hypermesh,Abaqus and Femfat,and the causes of the failure are analyzed.The results show that the reason for the rupture of the shield is that the first mode is less than 1.2 times of the excitation frequency,which is easy to produce resonance.Two optimization schemes are proposed,and the mode,strength and fatigue of the two optimization schemes are simulated.The calculation results show that when adding two more M8 fixing bolts on the body of the protective cover and changing the chamfer at the fracture position into a fillet,the first-order mode is greater than 1.2 times of the excitation frequency,which is the optimal scheme.The test results show that the optimized shield has no fracture fault,and the optimization scheme and simulation results are correct and feasible.