有缝线路上钢轨探伤车检测速度规划方法

Detection Speed Planning Method for Rail Flaw Detection Car on Jointed Track

基于钢轨探伤车超声波反射体静态检出原理,通过分析探轮对中偏差和喷水密度2个因素引起的超声波衰减规律,得到检测速度对这2个因素的影响结果,从而建立反映检测速度、探轮对中偏差、喷水密度与超声波反射体检出效果之间关系的超声波反射体检出效果模型。基于动态步长调节法,在满足检测区间限速的基础上,设计有缝线路的检测速度规划方法,即在多次检测过程中记录单个超声波反射体处的探轮对中偏差和检测速度,分析钢轨中该超声波反射体的检出结果,采用动态步长调节法对该超声波反射体的下次检测速度进行规划,将线路中各个超声波反射体处检测速度进行连接,从而规划出该线路中各点检测速度的方法。在某特定区间进行3次检测和2次检测速度规划的试验结果表明,该方法是有效可行的,且能提高已知超声波反射体的检出率。

Based on the static detection principle of the ultrasonic reflector of rail flaw detection car, by analyzing the attenuation law of ultrasonic wave caused by the two factors of probe wheel alignment deviation and water spray density, the influence of detection speed on these two factors was obtained. Accordingly , the detection effect model of ultrasonic reflector was built, which reflected the relationship between detection speed, probe wheel alignment deviation, water spray density and the detection effect of ultrasonic reflector. Based on the dynamic step adjustment method, and on the basis of satisfying the speed limit in the detection interval, the detection speed planning method of the jointed track was designed. Namely, the probe wheel alignment deviation and detection speed at the single ultrasonic reflector were recorded in the multiple detection process, the detection results of the ultrasonic reflector in the rail were analyzed. The dynamic step adjustment method was adopted to plan the next detection speed of the ultrasonic reflector. The detection speeds of the ultrasonic reflectors in the line were connected to plan the detection speed of each point in the line. The results of three tests and two tests for speed planning in a specific interval show that the proposed method is effective and feasible, and can improve the detection rate of the known ultrasonic reflectors.