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在实际检测中缆索拉力会影响导波检测换能效率,同时缺陷大小以及激励频率也会影响断丝缺陷信号的幅值。为了获得可靠的评估检测结果,需对磁致伸缩纵向导波平行钢丝缆索断丝缺陷信号进行研究。首先,在张拉情况下进行了缆索断丝导波检测实验,得到了拉力对断丝缺陷信号幅值的影响。然后,进行了缆索多根断丝导波检测实验,得到了不同激励频率下断丝根数与缺陷信号幅值间的关系。结果表明:缆索拉力对断丝缺陷信号幅值有一定的增强效果,但随着拉力增大其对幅值的增强效果会逐渐减小。同时,在一定激励频率下,断丝缺陷信号幅值与断丝根数呈近似线性关系。基于本文研究结果,可支持检测人员对检测信号进行补偿及分析,得到较可靠的断丝缺陷检测结果。
In actual testing, the pulling force of the cable will affect the detection efficiency of the guided wave detection, and the size of the defect and the excitation frequency will also affect the amplitude of the signal of the broken wire defect. In order to obtain a reliable assessment of test results, the need for magnetostrictive longitudinal guided wave parallel wire cable broken wire defect signal research. First, the cable broken wire guided wave test was carried out under the condition of tension, and the effect of tensile force on the signal amplitude of the broken wire defect was obtained. Then, the experiment of multi-root broken wire guided wave detection was carried out, and the relationship between the number of broken wires and the amplitude of defect signal under different excitation frequencies was obtained. The results show that the pulling force of the cable has a certain enhancement effect on the amplitude of the signal of the broken wire defect, but the increasing effect of the pulling force on the amplitude decreases. At the same time, under a certain excitation frequency, the amplitude of broken wire signal is approximately linear with the broken wire number. Based on the results of this study, we can support the detection staff to compensate and analyze the detection signal, and get a more reliable detection result of the broken wire defect.