Development of Intelligent Wire Rope with Self-Diagnostic Function

在开发具有自诊断功能的智能钢丝绳的第一阶段，我们研究了将钢丝绳中的电缆作为钢丝绳劣化监测元件的可行性。对几种电缆和钢丝绳进行了拉伸试验、弯曲疲劳试验和拉伸疲劳试验：1)电线等电缆的制造条件。覆盖材料的直径、节长、硬度对钢丝绳的抗拉强度、变形性和疲劳强度有很大影响。2)这些事实表明，以电缆为诊断单元，可以很容易地选择适合于监测钢丝绳劣化的电缆强度。3)钢丝绳内部电缆的电阻变化与钢丝绳劣化的进程有很好的对应关系。利用该无损检测系统进行了现场试验：4)我们研制的磁力无损检测系统可以对钢丝绳沿钢丝绳沿线的腐蚀情况进行定量评价。通过对退役吊索的检测，验证了评价的准确性。5)吊索的腐蚀沿其长度分布不均匀。6)磁致伸缩非接触产生和检测超声波可用于吊索的无损检测。吊索端部附着性退化。可以从超声波的衰减来评价。

At the first stage of the development of intelligent-wire ropes having self-diagnosis function, we studied the feasibility of using electric cable layered inside steel wire rope as a monitoring element for the deterioration of wire rope. We carried out tensile test, bending fatigue test, and tensile fatigue test for several kind of electric cables, and steel wire ropes with the electric cables inside:1) Manufacturing conditions of electric cables, such as wire. diameter, pitch length, hardness of covering material, have strong influence to their tensile strength, deformability and fatigue strength.2) These facts indicated that we can easily select the strength of electric cables suitable for monitoring the deterioration of steel wires with the electric cable as diagnostic element.3) The variation in resistance of electric cables layered inside the steel wire rope corresponded well with the progress of rope deterioration.Relevant to the diagnosis of wire rope integrity, we also developed NDT method for suspender ropes in suspension bridges. We carried out the field test using the NDT system:4) Our magnetic NDT system can evaluate the corrosion of suspender ropes quantitatively continuously along the rope. The accuracy of the evaluation were confirmed by examination of retired suspender ropes5) Corrosion of suspender rope were not uniformly distributed along its length.6) Magnetostrictive non-contact generation and detection of ultrasonic wave can be used for the NDT of suspender ropes. And the degradation of end-attachment of suspender rope. can be evaluated from the attenuation of ultrasonic wave.