首页> 外文会议>IEEE International Conference on Intelligent Transportation Systems >The estimation approach of rail thermal stress based on vehicle-track dynamic responses
【24h】

The estimation approach of rail thermal stress based on vehicle-track dynamic responses

机译:基于车轨动态响应的轨道热应力估计方法

获取原文

摘要

On account of the difficulty in measuring the true rail thermal stress, a new method is proposed to rapidly evaluate rail thermal stress based on the dynamic responses of vehicle-track coupling system. A vertical slab-track model with the rail longitudinal thermal stress is established. The natural vibration characteristic of the track under the influences of the rail longitudinal stress distribution has been calculated individually. The changed vibration modal function and frequency of track are used in calculating the dynamic response of vehicle-track coupling model. It can be seen from the dynamic responses that vibration frequency is shifted and amplitude peak is enhanced by thermal stress. In this paper, the digital features are extracted from the responses of wheelset and rail in time and frequent domain, which are used as training samples in SVM. Then, the rail longitudinal stress can be estimated with the prediction model. The numerical simulation results indicate that, by utilizing the train as the excitation source of the dynamic system, the rail longitudinal stress can be estimated with measurable response of wheel and rail at an acceptable accuracy.
机译:鉴于测量真实轨道热应力的困难,提出了一种基于车轨耦合系统动态响应快速评估轨道热应力的新方法。建立了具有轨道纵向热应力的竖向平板轨道模型。在轨道纵向应力分布的影响下,轨道的固有振动特性已单独计算。改变后的振动模态函数和轨道频率被用于计算车辆-轨道耦合模型的动力响应。从动态响应可以看出,振动频率发生了变化,振幅峰值因热应力而增大。本文从轮对和铁轨在时域和频域的响应中提取了数字特征,并将其用作支持向量机中的训练样本。然后,可以使用预测模型估算钢轨的纵向应力。数值模拟结果表明,通过利用列车作为动力系统的激励源,可以在可接受的精度下以可测量的轮轨响应估算出铁路纵向应力。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号