Development of compound inspection system for wirerope.

钢丝绳的损伤程度和强度决定了钢丝绳在索道、矿井提升机缆车、悬架屋面结构中作为受拉构件使用的安全性和使用寿命。因此，需要建立一种方法，能够准确评估由于疲劳或腐蚀而导致的钢丝绳内部损坏。为了弄清钢丝绳内部损伤的机理，探索防止钢丝绳内部损伤的方法，准确评估钢丝绳横截面内的损伤部位是至关重要的。利用在钢丝绳纵向饱和磁化过程中，从破损钢丝绳周围多个点处获得的漏磁数据，尝试制备基于钢丝绳内部各点破损程度的层析图，作为反问题的解，并利用修正最小二乘法在磁荷不为负的约束下求解该反问题。结果与绳索缺陷的位置相当吻合。考察漏磁测量方向对所得解的影响，建议采用z方向和θ方向。

The safety and lifespan of wire rope utilized in rope ways, cable cars of lifting machine of mine, and in suspension roofing structures as tension member, are determined by the damage degree and strength of the wire ropes used. It is therefore desired to establish a method that allows accurate assessment of damage that takes place inside the wire ropes due to fatigue or corrosion. To clarify the mechanism for damage within wire ropes and to explore methods for the prevention of such damage, it is essential to accurately assess the site of damage within the cross-section of wire ropes. Using the data of magnetic flux leakage obtained from multiple points around a damaged wire rope, during saturation magnetiza tion in the longitudinal direction of the rope, an attempt has been made to prepare tomograms, which are based on the degree of damage at each point inside the rope that was obtained as the solution to an inverse problem which was solved by using a modified least square method with a restriction that the magnetic charge must not be negative. The results agree considerably with the location of de fects in the rope. Examining the influence of the direction of the magnetic flux leakage measurement on the solution obtained, it is recom-mended to use z and theta directions.