中文摘要：

准确检测和定位轨道的断轨位置一直是铁路安全的重中之重,由于导波能沿轨道长距离传播,采用导波的无损检测技术能够一次检测较长距离的钢轨.在反射系数的导波法裂缝检测中;利用宽频导波在断裂处的反射特性以及导波的传播特性进行断轨定位.其间又推导了无限长结构中裂缝位置与导波波幅的数学关系,并根据这一数学关系给出了检测算法和流程.通过2.8 m长钢轨的断裂检测实验表明,在20 kHz到40 kHz范围内,如果选择合适的计算频段,该方法能够得到较好的定位结果,定位误差1.2 %.

英文摘要：

Accurate detection and localization of rail cracks are very important for railroad operation safety. Since theguided wave can propagate in very long distance along the rail, the non-destructive rail crack detection technique based onguided wave can be applied to detect a very long section of the rail track at a same time. In this paper, the reflection featureat the rail cracks and the propagation performance of the broadband guided wave were used to localization the rail cracks.The mathematical relation between the crack position and the amplitude of the guided wave was formulated. Then, accordingto the relation, the algorithm and the flowchart for rail crack detection were given. The experiment on a 2.8 m long railusing 20 kHz-40 kHz frequency guided wave indicates that this algorithm can locate the crack effectively if a pertinent frequencyband is selected. The locating error is 1.2 % only.