基于导波能量谱的钢绞线腐蚀损伤识别研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (20) : 115-121.

论文

基于导波能量谱的钢绞线腐蚀损伤识别研究

钱骥1，陈鑫1，蒋永2，姚国文1

作者信息 +

Steel strands corrosion identification based on guide wave energy spectrum

QIAN Ji1, CHEN Xin1 JIANG Yong2, YAO Guowen1

Author information +

文章历史 +

摘要

通过在不同腐蚀程度钢绞线上进行超声导波试验，构建以导波的小波包能量谱作为特征向量的腐蚀指标。结果表明：随腐蚀程度增加，实测导波的小波包能量谱出现明显变化，基于小波包能量谱的腐蚀指标值随腐蚀程度增加线性增长；采用钢绞线侧面激励导波进行腐蚀状态识别，其敏感性优于钢绞线端面激励，端面激励敏感性系数K值仅为侧面激励的51.35%，确定系数降低了6.4%；腐蚀指标抗噪性能良好，当信噪比达到10dB时，P1测点敏感性系数K值仅下降了5.97%，信噪比达到0dB的强噪声环境下，K值仍达到0.51，较未加入噪声时相比，降幅为23.88%；腐蚀指标受导波传播距离影响，当距离增加时，腐蚀指标的敏感性略有降低，且在低腐蚀状态下波动较大。

Abstract

Through carrying out ultrasonic guided wave experiments in steel strands with different level corrosion, corrosion indicators were established by calculating the eigenvectors of wavelet packet energy spectrum from the measured guide wave.The results indicated that the wavelet packet energy spectrum changed obviously and the corrosion indicators increased linearly with the increasing of corrosion degree.The sensibility of corrosion indicators was superior when the excitation source located at the lateral of steel strands, and the K-value from end section was 51.35% of strands side and the determination coefficient reduced 6.4% meanwhile.Corrosion indicators possessed good performance in anti-noise capability, which reduced 5.97% when the signal-noise ratio reached 10 dB and still reached 0.51 as the signal-noise down to 0 dB.Corrosion indicators were affected by guide wave propagation distance and their sensibility brought down slightly and appeared great fluctuation in low corrosion degree with the increasing of propagation distance.

导出引用

钱骥1，陈鑫1，蒋永2，姚国文1 . 基于导波能量谱的钢绞线腐蚀损伤识别研究[J]. 振动与冲击, 2018, 37(20): 115-121

QIAN Ji1, CHEN Xin1 JIANG Yong2, YAO Guowen1. Steel strands corrosion identification based on guide wave energy spectrum[J]. Journal of Vibration and Shock, 2018, 37(20): 115-121

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