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A Study on the Electromagnetic Inspection of Large-Diameter Ropes

大直径钢丝绳电磁检测研究

基本信息

批准号：
60550444
负责人：
FUJINAKA Yuzo
金额：
$ 0.96万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

项目摘要

In order to evaluate the degree of deterioration of large-diameter stationary wire ropes, such as cables in suspension roofings and suspension bridges, two systems of electromagnetic inspection instruments have been developed and constructed. These instruments are different in the principle to magnetize the rope. The one which is intended for testing the ropes up to 60 mm in diameter has an electromanget with a couple of annylar magnetic poles to magnetize the rope longitudinally to the saturation state. The other one for the ropes up to 95 mm in diameter utilizes two solenoidal coils coaxial with the rope, which induce magnetic field more effectively along the rope to be inspected.The detector unit in these instruments has twin annylar arrays of Hall effect elements to sense the radial component of spatial leakage flux derived from the defect in the rope. Each annylar array is divided into six circumferential segments, and the individual output of the segments can be extracted for locating the defect in the cross section of the rope.The inspection of PWS cables in a suspension roofing was carried out with the instruments, and the inspection records obtained were examined.As the result of this research these instruments have been recognized to be useful and effective for inspecting large-diameter stationary ropes. The deterioration of the rope under question has been estimated in terms of loss in the cross sectional area from the inspection records by introducing the new method of interpretation, and the cross sectional area loss estimated by electromagnetic inspection corresponded closely to the real area loss in the rope.

为了评估大直径固定钢丝绳的劣化程度，如悬索屋盖和悬索桥中的电缆，已经开发并建造了两套电磁检测仪器系统。这些仪器磁化绳子的原理不同。用于直径达60 mm的钢丝绳测试的电磁铁具有一对环形磁极，用于纵向磁化钢丝绳至饱和状态。另一种用于直径达95 mm的钢丝绳，采用两个与钢丝绳同轴的螺线管线圈，更有效地沿钢丝绳沿着方向感应磁场。这些仪器中的探测器单元具有双环形霍尔效应元件阵列，用于感测钢丝绳缺陷产生的空间漏磁通的径向分量。每个环形阵列被分成六个圆周段，每个圆周段的输出信号都可以被提取出来，用于定位钢丝绳横截面上的缺陷。并对所获得的检查记录进行了检查。作为这项研究的结果，这些仪器已被公认为是有用和有效的检查大型，直径固定绳。通过引入新的解释方法，根据检查记录中的横截面积损失估计了所讨论的钢丝绳的劣化，并且通过电磁检查估计的横截面积损失与钢丝绳中的真实的面积损失密切对应。