Health monitoring of cables in civil engineering structures is a great challenge, because their integrity directly affects the safety of the whole structure. A magnetostrictive (MS) transducer‐based guided wave method for cable damage detection is presented in this study. A wave energy‐based method is proposed for damage localization and severity assessment. The wave energy transmission coefficient at the damage location is presented as a measure for the damage condition. Firstly, the wave dispersion properties were analyzed on a steel strand with seven helical wires using a semi‐analytical finite element (SAFE) method. Then, the selection of exciting frequency and design of the MS transducer were carried out based on the SAFE analysis results. Numerical and experimental studies were performed on multiple cases of wire breakage and corrosion using the pitch‐catch method. Time‐of‐flight information on the wave packets reflected from the damages was used for damage localizations, while wavelet coefficients were used to accurately analyze wave energy transmission and reflection. It has been found that the damage locations and damage conditions can be determined accurately using the proposed method.

中文翻译：

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使用波能传输和反射进行基于波的引导式电缆损伤检测

土木工程结构中电缆的健康监控是一个巨大的挑战，因为电缆的完整性直接影响整个结构的安全性。本研究提出了一种基于磁致伸缩（MS）换能器的导波方法，用于电缆损坏的检测。提出了一种基于波浪能的方法来进行损伤定位和严重性评估。损坏位置处的波能量传输系数表示为损坏条件的度量。首先，使用半解析有限元（SAFE）方法分析了具有7条螺旋线的钢绞线上的波分散特性。然后，根据SAFE分析结果进行了励磁频率的选择和MS换能器的设计。使用间距捕捉法对多种情况下的导线断裂和腐蚀进行了数值和实验研究。从损伤反射的波包的飞行时间信息用于损伤定位，而小波系数用于精确分析波能量的传输和反射。已经发现，使用所提出的方法可以精确地确定损坏的位置和损坏的条件。