Study on rail fastener failure testing based on fractal theory

摘要：

　　The residual vibration of steel rail is rich in the mechanical properties, which include the constraint, that was, the degree of tightness of the fastener.The aim of this research is to characterize the tightness of rail fastener.A fractal analysis procedure based on 1-D curve length calculation is proposed, which applies a length unit to cover fastening the behavior of fasteners.Using the rail vibration data under periodic pulse excitation measured by a track fastener inspection vehicle, this method can derive the fractal dimension of fastener tightness directly (D ∈ 1, 2)).Furthermore, 1-D curve length method is also introduced into multi-fractal spectrum analysis for investigating fine scale information.The statistical analysis demonstrates that, fractal dimension Dl, Dr, and multi-fractal parameters αfmax, △α can reflect the change process of the tightness of rail fasteners effectively.Therefore, it shows potential to use the fractal parameters of the rail vibration signal to characterize the tightness of the fastener.

关键词： fractal rail fastener unfastening

作者: Huijian Zhang Qiang Liu

作者单位: Beijing Municipal Institute of Labour Protection, Beijing, China

会议类型: 国际会议

会议名称: The 28th International Conference on Vibroengineering (第28届国际振动工程会议)

会议地点: 北京

会议语种:英文

页码: 208-213

在线出版日期: 2017-10-19（万方平台首次上网日期，不代表论文的发表时间）