扁平线圈钢丝绳捻距涡流响应分析及试验研究  

Analysis of Eddy Current Response to Lay Length of Wire Rope with Pancake Coil and Experimental Study

作　　者：李腾宇[1,2,3] 寇子明 吴娟[1,2,3] 焦少妮 毛清华[4] LI Tengyu;KOU Ziming;WU Juan;JIAO Shaoni;MAO Qinghua(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024;Shanxi Province Engineering Technology Research Center for Mine Fluid Control,Taiyuan 030024;National-local Joint Engineering Laboratory of Mining Fluid Control,Taiyuan 030024;Mechanical Engineering School,Xi’an University of Science and Technology,Xi’an 710054)

机构地区：[1]太原理工大学机械运载与工程学院,太原030024 [2]山西省矿山流体控制工程技术研究中心,太原030024 [3]矿山流体控制国家地方联合工程实验室,太原030024 [4]西安科技大学机械工程学院,西安710054

出　　处：《机械工程学报》2020年第16期13-21,共9页Journal of Mechanical Engineering

基　　金：山西煤基低碳联合基金重点支持(U1510205);国家重点研发计划(2016YFC0600908);山西省应用基础研究(201801D121177);陕西省矿山机电装备智能监测重点实验室开放基金(SKL-MEEIM201905);远东无损检测新技术论坛创新人才支持计划资助项目。

摘　　要：捻距作为钢丝绳重要参数之一,对其进行检测可间接反映钢丝绳受力状态和表面损伤状态。针对现有图像识别方法受限于外界光照及钢丝绳表面附着物覆盖情况、漏磁法需要磁化钢丝绳等问题,提出采用双扁平线圈差分电桥的钢丝绳捻距涡流检测方法。结合Ar,V-Ar表述建立钢丝绳涡流响应分析控制方程,对单绳股涡流分布进行分析。探头正下方绳股表面涡流形成漩涡,绳股两侧曲面上涡流分布存在对称性。对扁平线圈的中径进行优化设计,当中径小于等于股间隙时,捻距检测精度高且检测灵敏度高,然后搭建试验平台进行捻距检测。试验结果与仿真均表明扫描信号中相邻波峰或者相邻波谷的间距为股间隙,一个捻距范围内扫描信号出现的波峰或者波谷数量与钢丝绳绳股数目相关。利用集合经验模态分解方法对试验结果进行后处理可以有效提取有用信号,涡流法得到钢丝绳捻距的相对误差不超过0.13%。The lay length is one of the important parameters of the wire rope.The measurement of the lay length can indirectly reflect the stress state and the surface damage state of the wire rope.The imaging recognition method for measuring the lay length is limited by the external light and the attachment on the surface of the wire rope.The magnetic flux leakage method requires the wire rope to be magnetized.In view of the above problems,An eddy current method to detect the lay length using the double pancake coils differential bridge is proposed.Firstly,the governing formulations based on the Ar,V-Ar for the eddy current response analysis are established.Combing the formulations,the distribution of the eddy current in the single strand is simulated.It forms vortex on the strand surface just under the pancake coil.The distributions of the eddy current on the curved surfaces of the two sides of the strand are symmetrical.Secondly,the medium radius of the pancake coil is optimized.When the medium radius equals to or is smaller than the gap between the two adjacent strands,the detection precision of the lay length is high and the detection sensitivity is also high.Thirdly,the experimental platform is set up to test the lay length.The experimental results and the simulation results show that the distance of the adjacent peaks or throughs of the scanning signal is just the gap between the two adjacent strands.The number of the peaks or throughs of the scanning signal in the lay length is related to the strands number of the wire rope.Finally,in order to effectively extract the useful information from the experimental results,the ensemble empirical mode decomposition(EEMD)method is utilized.The results show that the relative error of the wire rope lay length obtained by this method is less than 0.13%.

关 键 词：钢丝绳 捻距 涡流检测 差分电桥 有限元分析 

分 类 号：TP206[自动化与计算机技术—检测技术与自动化装置]