基于有限元分析的接触网整体吊弦优化设计

Optimal design of overhead enary based on finite element analysis

针对列车运行过程中整体式吊弦出现微动疲劳断裂的问题,提出一种基于ANSYS有限元分析的接触网整体吊弦优化设计方法。首先通过有限元计算方法分析整体吊弦的损伤机理;然后在原有吊弦基础上进行优化设计。即在吊弦线中加入一个减振装置,以消耗受电弓抬升引起的振动能力,减少吊弦弯曲量,增加吊弦疲劳寿命;最后通过动态疲劳试验对优化前后的吊弦进行弯曲微动疲劳寿命变化分析,以验证提出方法的可行性。试验结果表明,优化后的吊弦接触线夹持点的仿真误差均控制在5%以内。说明提出的方法可有效降低吊弦的疲劳损伤且保证受电弓与接触线能完成良好的受流,增加了吊弦的疲劳寿命,提高了整个接触网系统的运营安全性,从而进一步提升了列车运行的平稳性和安全性。

In view of the problem of integral train operation with micro fatigue fracture,a method of optimal design based on ANSYS finite element analysis is proposed.The damage mechanism of the whole hanging string is analyzed by finite element calculation,and then the design is optimized based on the original hanging string.That is,a vibration damping device is added to the lifting string to reduce the vibration capacity caused by the pantograph,reduce the bending capacity of the lifting string and finally use the dynamic fatigue test to verify the feasibility of the proposed method.The results show that the simulation error of the optimized contact line is controlled within 5%.It shows that the proposed method can effectively reduce the fatigue damage of the hanging string and ensure that the pantograph and the contact line can complete a good flow,increase the fatigue life of the hanging string,and improve the operation safety of the whole catenary system,so as to further improve the stability and safety of the train operation.