Elevator wire ropes with polymer cores hold and hoist heavy fluctuating loads in a corrosive environment. Such working condition causes metal fatigue, which together with abrasion around pulleys leads to progressive loss of the metallic cross section. This can be seen in the forms of a roughened and pitted surface of the ropes, reduction in diameter, and broken wires. Therefore, their deterioration must be monitored so that any unexpected damage or corrosion can be detected before it causes a fatal accident. Ultrasonic-guided wave-based inspection, which has proved its capability in nondestructive testing of platelike structures such as tubes and pipes, can monitor the cross section of wire ropes in their entire length from a single point. However, guided waves have drawn less attention for defect detection purposes in wire ropes. This article reports the condition monitoring of a steel wire rope from a hoisting elevator with broken wires as a result of corrosive environment and fatigue. Finite element analysis was conducted as a baseline to study guided wave propagation in wire ropes and plot dispersion curves. Guided wave propagation in wire ropes was experimentally investigated on a newly built cable stretching machine equipped with a load sensor under different amount of tensile loading. To expose the indication of broken wires, the recorded signals were analyzed by tailor-made continuous wavelet transform called tone burst wavelet.

中文翻译：

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超声波导波和音爆小波检测电梯钢丝绳断丝

带有聚合物芯的电梯钢丝绳可在腐蚀性环境中保持和提升重的波动载荷。这种工作条件会导致金属疲劳，这与滑轮周围的磨损一起导致金属横截面的逐渐损失。这可以从绳索的粗糙和麻点表面、直径减小和断丝等形式看出。因此，必须监控其劣化，以便在导致致命事故之前检测到任何意外损坏或腐蚀。超声波导波检测已证明其在管子和管道等板状结构的无损检测方面的能力，可以从一个点监测钢丝绳整个长度的横截面。然而，导波在钢丝绳缺陷检测方面的关注度较低。本文报道了因腐蚀环境和疲劳而导致钢丝绳断裂的提升电梯钢丝绳的状态监测。将有限元分析作为研究钢丝绳中导波传播的基线并绘制色散曲线。在配备不同拉伸载荷下的载荷传感器的新建电缆拉伸机上，对钢丝绳中的导波传播进行了实验研究。为了暴露断线的迹象，记录的信号通过称为音调突发小波的定制连续小波变换进行分析。将有限元分析作为研究钢丝绳中导波传播的基线并绘制色散曲线。在配备不同拉伸载荷下的载荷传感器的新建电缆拉伸机上，对钢丝绳中的导波传播进行了实验研究。为了暴露断线的迹象，记录的信号通过称为音调突发小波的定制连续小波变换进行分析。将有限元分析作为研究钢丝绳中导波传播的基线并绘制色散曲线。在配备不同拉伸载荷下的载荷传感器的新建电缆拉伸机上，对钢丝绳中的导波传播进行了实验研究。为了暴露断线的迹象，记录的信号通过称为音调突发小波的定制连续小波变换进行分析。