Smart Engineering Asset Management Laboratory (SEAM) and the Croucher Optical Nondestructive Testing and Quality Inspection Laboratory (CNDT), Department of Systems Engineering & Engineering Management, City University of Hong Kong, Hong Kong, China.
Sensors (Basel). 2020 Sep 4;20(18):5025. doi: 10.3390/s20185025.
Multiple wire twisted steel strands are commonly used to hoist elevators, concrete structures, etc. Due to frequent and long-time usage, the steel strands are subjected to corrosion, overloads, and aging, making strands may fail unexpectedly. Hence, the health monitoring of steel strands becomes more important to avoid the sudden collapse of hoisting structures. Guided waves (GW) inspection methods have become favorable in recent years due to its long-distance transmission and stability of evaluation in the area of structural health monitoring (SHM) and Non-Destructive Testing (NDT). Many researchers have reported different GW methods to detect different types of defects that occurred in steel strands. However, researchers rarely carry out comparative studies to investigate the effectiveness of each method or system in monitoring the health state of steel strands. This article reports some vital observations revealed from conducting experiments by using contact and noncontact methods, which include three different popular types of GW sensors and methods during their applications in surface-type defect detection. The proper selection of sensors systems has been identified through the present study. The result of the present study is believed to be useful guidance for selecting appropriate GW methods and sensor systems to monitor the integrity of the steel strand and thereby ensure the safety of the hoisted structures.
多股绞合钢丝绳常用于电梯、混凝土结构等的吊装。由于频繁和长时间的使用，钢丝绳会受到腐蚀、过载和老化的影响，导致钢丝绳可能会意外失效。因此，钢丝绳的健康监测对于避免吊装结构的突然倒塌变得更加重要。导波（GW）检测方法近年来在结构健康监测（SHM）和无损检测（NDT）领域因其远距离传输和评估稳定性而受到青睐。许多研究人员已经报道了不同的 GW 方法来检测钢丝绳中发生的不同类型的缺陷。然而，研究人员很少进行比较研究来调查每种方法或系统在监测钢丝绳健康状态方面的有效性。本文报道了通过使用接触和非接触方法进行实验所得到的一些重要观察结果，其中包括在表面型缺陷检测中应用的三种不同类型的 GW 传感器和方法。通过本研究已经确定了合适的传感器系统的选择。本研究的结果被认为是选择合适的 GW 方法和传感器系统来监测钢丝绳完整性并确保吊装结构安全的有用指导。
