线路焊缝区几何不平顺动力响应仿真分析

Simulation and Analysis of Dynamic Cesponse of Geometric Irregularity in Railway Welding Seam Zone

为分析列车在不同焊缝形状和波深下的车辆动力响应与轮轨接触状态,建立普速客车-有砟轨道垂向耦合动力学模型和焊缝不平顺模型。将焊缝按照几何形状分为倒V形、M形、V形和W形,分析4类焊缝在不同波深、速度等工况下的垂向动力响应。发现焊缝不平顺会引起轮轨垂向力、轴箱垂向振动加速度等参数在短时间内增幅达到30%左右,造成较大的轮轨冲击。焊缝波深越大,车速越快,车辆-轨道系统垂向动态响应越差,轮轨垂向力最大增加66.28%。根据焊缝安全限值的计算结果,发现W形焊缝安全限值最小,倒V形焊缝安全限值最大。建议优先打磨处理W形焊缝,再依次处理V形、M形焊缝,最后处理倒V形焊缝。

In order to analyze the vehicle dynamic response and the wheel-rail contact state of the train under different welding seam shapes and wave depths,a normal-speed passenger car-ballasted track vertical coupling dynamics model and a welding seam irregularity model are established.The welding seams are divided into inverted V-shaped,Mshaped,V-shaped and W-shaped according to their geometric shapes,and the vertical dynamic responses of the four types of welding seams under different wave depths,speeds and other conditions are analyzed.It is found that the irregu⁃larity of the welding seam will cause the parameters such as the vertical force of the wheel-rail and the vertical vibration acceleration of the axle box to increase about 30%in a short time,resulting in a large wheel-rail impact.The larger the welding seam wave depth,the faster the vehicle speed,the worse the vertical dynamic response of the vehicle-track sys⁃tem,and the maximum increase in the vertical force of the wheel and rail by 66.28%.According to the calculation for the safety limit of the welding seam,it can be found that the safety limit of the W-shaped welding seam is the smallest,and the safety limit of the inverted V-shaped welding seam is the largest.It is recommended to give priority to grinding the W-shaped welding seam,subsequent grinding V-shaped,M-shaped,and finally grinding inverted V-shaped welds.