微磁检测在火车轮轮对检测中的应用研究.pdfVIP

2017年4月 April,2017 失效分析与预防 第12卷　 第2期 Vol.12,No.2 微磁检测在火车轮轮对检测中的应用研究 ∗ 庞智辉, 于润桥 , 胡　 诚, 赵龙灿 (无损检测技术教育部重点实验室 (南昌航空大学), 南昌330063) [摘　 要] 针对火车轮内部缺陷,提出了一种基于地磁场环境下的无损检测方法。 首先理论分析微磁检测应用于火车轮轮 对内部缺陷的可行性,然后根据火车轮外观尺寸设计火车轮微磁检测系统,最后通过检测预制人工孔洞缺陷的火车轮试块 完成微磁检测的试验部分。 研究采用阈值法处理磁梯度检测信号,数据分析结果验证微磁检测对火车轮内部缺陷检测的可 行性。 试验结果表明:试件中孔洞缺陷直径一定时,埋藏深度越深,缺陷引起的磁感应强度相对变化量越小,而当孔洞缺陷 埋深一定时,孔洞缺陷直径越大,缺陷引起的磁感应强度相对变化量也同样会越小,但磁场的异常区域越大;采用阈值法可 有效识别缺陷,并实现缺陷微磁检测的可视化。 [关键词]火车轮轮对; 微磁检测; 检测系统 [中图分类号]TG115.28　 　 　 　 　 [文献标志码] A　 　 　 　 　 doi:10.3969/ j.issn.1673-6214.2017.02.005 [文章编号] 1673-6214(2017)02-0094-07 Application Research on Micro-magnetic Testing of Train Wheels Detection ∗ PANGZhi-hui, YU Run-qiao , HU Cheng, ZHAO Long-can (Key Laboratory of Nondestructive Test (Ministry of Education),Nanchang Hangkong University,Nanchang 330063,China) Abstract:In this paper,a non-destructive testing method based on geomagnetic field was proposed for internal defects in the train wheels. Firstly,thefeasibility of micro-magnetic testing on the internal defects of train wheels was analyzed theoretically. Then,this paper designed the train wheels micro-magnetic testing system,according to the shape and size of the train wheels. Finally,the experimental part of the micro-magnetic testing was completed through testing the test blocks which were processed artificial holes. This article used the threshold method to deal with magnetic gradient detection signal. The data analysis results verified thefeasibility of micro-magnetic testing on the internal defects detection of train wheels.