The invention provides a turnout switch rail crack detection method and device based on nonlinear ultrasonic guided waves, and the method comprises the steps: firstly, generating a first target fundamental wave signal containing a first fundamental wave signal and a second fundamental wave signal, the two sine wave signals are continuously and simultaneously sent, and the sending duration is longer than the transmission delay of the fundamental wave signal between the two end points of the turnout switch rail; then, a signal generated by vibration of the turnout switch rail is received, a first relative nonlinear coefficient of the signal is calculated, and whether cracks exist in the switch rail or not is judged by comparing the first relative nonlinear coefficient with a preset damage threshold value; if the crack is detected, a second target fundamental wave signal is sent, the signal is composed of a third fundamental wave signal and a fourth fundamental wave signal, detailed detection of a specific detection area is achieved by adjusting the positions of the two signals in a mixed area of the switch rail, and then the specific position of the crack in the switch rail is determined based on a second relative nonlinear coefficient. According to the invention, long-distance flaw detection of turnout switch rail cracks can be realized, and identification and positioning of the cracks are realized.

    本申请提供了一种基于非线性超声导波的道岔尖轨裂纹检测方法及装置,该方法包括:首先,生成包含第一和第二基波信号的第一目标基波信号,这两种正弦波信号连续且同时发送且发送时长大于基波信号在道岔尖轨两端点之间的传输延时;接着,接收由道岔尖轨振动产生的信号,并计算其第一相对非线性系数,通过与预设损伤阈值比较来判断尖轨是否存在裂纹;若检测到裂纹,则发送第二目标基波信号,该信号由第三和第四基波信号组成,通过调整这两个信号在尖轨中的混合区域位置,实现对特定检测区域的详细检测,进而基于第二相对非线性系数确定裂纹在尖轨中的具体位置。本申请能够实现道岔尖轨裂纹的远距离探伤,实现裂纹的识别与定位。


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    Title :

    Turnout switch rail crack detection method and device based on nonlinear ultrasonic guided waves


    Additional title:

    一种基于非线性超声导波的道岔尖轨裂纹检测方法及装置


    Contributors:
    ZHU LIQIANG (author) / NIU XIAOCHUAN (author) / XU XINING (author) / YU ZUJUN (author)

    Publication date :

    2024-12-06


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    G01N Untersuchen oder Analysieren von Stoffen durch Bestimmen ihrer chemischen oder physikalischen Eigenschaften , INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES / B61K Andere Hilfseinrichtungen für Eisenbahnen , OTHER AUXILIARY EQUIPMENT FOR RAILWAYS



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