基于压电导波时频分析的钢绞线损伤研究
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摘要
钢绞线是预应力结构和大跨索承体系桥梁的核心受力构件,其健康状况将决定结构的承载能力和耐久性。通过实验制作不同缺陷程度的钢绞线,进行压电超声导波实验,并采集波形信号进行分析,将波形时域信号通过小波变换转换到时频域上进一步的分析。结果表明:端面回波明显,随着缺陷程度的增大,缺陷回波波包增多,缺陷回波幅值与直达波幅值的比值增大,且增长较快,端面回波幅值与直达波幅值的比值变化不明显。在时频域中,在5 ms与7 ms时间点附近出现了能量较大的时频云图,且随着缺陷程度的增大,5ms处颜色越深,能量越大,对应钢绞线缺陷回波越明显。缺陷程度较大时,出现了较多的时频云图,说明出现了二次回波。
Steel strands are the most crucial components in pre-stressed structures and long-span bridges, and its health condition is the determinant of structure's carrying capacity and durability. The steel stran with different defect degree was made by experiment, and piezoelectric ultrasonic wave guide experiments were conducted.The waveform signal is collected for analysis, and the waveform signal in time domain is converted to time domain by wavelet transform for further analysis. The result show that The end surface echoes are clear,with the increase of the defect degree, the defect return wave packet increases, and the ratio between the defect return amplitude and the direct amplitude increases rapidly. The ratio of the end-face return amplitude to the direct amplitude does not change significantly. In the time of frequency-frequency domain, there was an increase in energy at the time of 5 ms and 7 ms, and with the increasing degree of the defect, the deeper the color of the 5 ms is, the greater the energy, the more visible the return of the steel strand will be. When the defect degree is large, more time-frequency cloud images appears, indicating that the secondary echo appears.
Steel strands are the most crucial components in pre-stressed structures and long-span bridges, and its health condition is the determinant of structure's carrying capacity and durability. The steel stran with different defect degree was made by experiment, and piezoelectric ultrasonic wave guide experiments were conducted.The waveform signal is collected for analysis, and the waveform signal in time domain is converted to time domain by wavelet transform for further analysis. The result show that The end surface echoes are clear,with the increase of the defect degree, the defect return wave packet increases, and the ratio between the defect return amplitude and the direct amplitude increases rapidly. The ratio of the end-face return amplitude to the direct amplitude does not change significantly. In the time of frequency-frequency domain, there was an increase in energy at the time of 5 ms and 7 ms, and with the increasing degree of the defect, the deeper the color of the 5 ms is, the greater the energy, the more visible the return of the steel strand will be. When the defect degree is large, more time-frequency cloud images appears, indicating that the secondary echo appears.
引文
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[9]钱骥,陈鑫,蒋永,等.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.
[2] Rai?utis R, Ka?ys R, Ma?eika L, et al. Ultrasonic guided wave-based testing technique for inspection of multi-wire rope structures[J]. Ndt&E International,2014,62(2):40-49.
[3] Liu Z,Liu S,Wu B,et al. Propagation characteristics of high order longitudinal modes in steel strands and their applications[J].固体力学学报(英文版), 2008,21(6):573-579.
[4]刘增华,赵继辰,吴斌,等.高阶纵向超声导波在钢绞线缺陷检测中的应用研究[J].工程力学,2011,28(4):214-220.
[5] Liu Z,Zhao J,Wu B,et al.Configuration optimization of magnetostrictive transducers for longitudinal guided wave inspection in seven-wire steel strands[J].Ndt&E International,2010,43(6):484-492.
[6] Farhidzadeh A,Ebrahimkhanlou A,Salamone S.Corrosion damage estimation in multi-wire steel strands using guided ultrasonic waves[C]//Smart Structures/nde.2015.
[7]杨志学,汪正山,叶雅婷,等.基于超声导波的长距离高压多芯电缆缺陷检测[J].无损检测,2018,40(12):57-62.
[8] Xu J,Wu X J,Kang Y H.An instrument for detecting corrosion in anchorage zones of bridge cables using guided waves[C]//18th World Conference on Nondestructive Testing.2012:16-20.
[9]钱骥,陈鑫,蒋永,等.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.