基于ANSYS workbench的发动机连杆力学性能及模态分析

Mechanical Properties and Modal Analysis of Engine Connecting Rod Based on ANSYS Workbench

连杆是汽车发动机的重要零件,长期摆动会引发连杆疲劳破坏,影响连杆寿命。利用CATIA V5R20软件建立连杆的实体模型,利用ANSYS workbench软件对连杆进行力学性能及模态分析,分析结表明:连杆最大应力为2.57×10^9 Pa(靠近大头方向的加强槽圆角处)、最小应力为2.85×10^3 Pa(集中在连杆大头和小头顶部);最大等效弹性应变为0.013 mm(靠近大头肋壁与大头孔的圆弧处)、连杆模型的最小等效应变为2.87×10^-8 mm(集中在发动机连杆大头和小头的顶角);连杆最大变形处位于连杆小头端,最大值为8.5236 mm,在连杆大头端变形最小;连杆进行模态分析,当连杆为10阶阵型,振动频率为2833.3 Hz时,最大变形则为87.894 mm,此时连杆振动和变形最为严重。分析结果为后续发动机连杆的优化设计提供参考依据。

The connecting rod is an important part of the automobile engine.Its long-term swing will cause the fatigue damage of the connecting rod and affect its life.CATIA V5R20 software is used to establish the solid model of connecting rod,and ANSYS workbench software is used to conduct mechanical performance and modal analysis of connecting rod in the paper.The analysis shows:1)the maximum stress of the connecting rod is 2.57×10^9 Pa(at the round corner of the reinforcing groove near the big head)and the minimum stress is 2.85×10 ^3 Pa(concentrated at the top of the big head and small head);2)the maximum equivalent elastic strain is 0.013 mm(at the arc near the big head rib wall and the big head hole)and the minimum equal-effect of the connecting rod model is 2.87×10 ^-8 mm(concentrated at the top angle of the big head and small head of the engine connecting rod);3)the maximum deformation of the connecting rod is located at the small end of the connecting rod,with the maximum value of 8.5236 mm and the minimum deformation is at the big end of the connecting rod;4)the modal analysis of connecting rod is conducted,when the connecting rod is in the 10th order formation and the vibration frequency is 2833.3 Hz,the maximum deformation is 87.894 mm at this time.The analysis results of the most serious vibration and deformation of connecting rod provide a reference for the optimal design of follow-up engine connecting rod.