Effect of Multiple Location Defects on the Dynamics of Draft Gear used in Freight Railway Wagon
Effect of Multiple Location Defects on the Dynamics of Draft Gear used in Freight Railway Wagon
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多位置缺陷对货车缓冲器动力学的影响
DOI：
10.4273/ijvss.7.3.04
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S. Harsha
中科院分区：
文献类型：
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作者：
S. S. Harak;Satish C. Sharma;S. Shukla;Parinay Gupta;Sanjay Kumar;S. Harsha
本文研究了裂纹位置对不同方向货车自动车钩用缓冲器固有频率的影响。首先，用有限元方法确定了一个健康缓冲器的七种振型。在作为缓冲器部件的缓冲垫的横向和纵向上模拟了半椭圆形状的缺陷。通过考虑不同方向的缓冲器裂纹的多个位置，模拟了不同的损伤情况。分析了裂纹方向和缺陷瓦位置对缓冲器固有频率的影响。结果表明，对于单个缺陷瓦和多个缺陷瓦，缓冲器的固有频率与缓冲器的动力学特性有关。还观察到，与单个有缺陷的焊盘相比，连续焊盘中的缺陷导致更多的频率变化。就缺陷垫的位置而言，可以看出，缓冲器频率对位于壳体底板附近或顶部从动件附近的缺陷垫更敏感。该研究为基于振动特征的缓冲器裂纹缺陷诊断提供了一种工具。
The present work investigates the effect of crack location on the modal frequency of draft gear used in autocouplers of freight railway wagon for various orientations. First seven mode shapes of a healthy draft gear have been determined using finite element approach. Defect of semi-elliptical shape is modelled in the lateral as well as longitudinal direction of the draft pad which is a component of draft gear. Various damage scenarios have been simulated by considering multiple locations of the crack in the draft gear for different orientations. Effect of crack orientation and defective pads location on the natural frequency of draft gear is analysed. It is seen that for single defective pad as well as multiple defective pads, the natural frequency of draft gear is dependent on the dynamics of draft pad. It is also observed that defect in consecutive pads causes more change in frequency as compared to single defective pad. As far as the location of defective pad is concerned, it is seen that the draft gear frequency is more sensitive to defective pads located either near the housing base plate or top follower. This study provides a tool to diagnose crack defect in draft gear based on vibration characteristics.