Combined with the research project of the advanced performance of wire rope in the port cranes , a key technological problem of the ministry of communications , this dissertation investigated the stress - effect on the magnetic flux leakage ( mfl ) of wire ropes and the law of the mfl signal changes during wire rope fatigue testing by experiments and modern signal processing methods based on the ferromagnetic theory , being aimed at the present problems of current wire rope testing technology . the characteristic parameters and quantitative descriptive specifications for wire rope defective signal were analyzed in detail . this dissertation present a novel method of quantitatively evaluating locate faults ( lf ) 本文结合交通部重点科技项目“港口起重机钢丝绳传动件的高性能技术研究” ，针对当前钢丝绳电磁检测技术中所存在的问题，以铁磁学为理论基础，以试验和现代数字信号处理技术为手段，对钢丝绳漏磁信号的应力效应、钢丝绳疲劳损伤历程中的漏磁信号变化规律做了深入的研究，对钢丝绳缺陷信号的特征参数和缺陷的定量描述指标做了详细的分析，提出了一种局部缺陷的定量逼近方法。
The paper gives emphasize to the approach of detecting signals compression . firstly , through analyzing detecting signals , the paper purposes the train of thoughts that just compressing and storing the flaw signals . then , according to character of flaw signals , the paper comes up with the compression method of detecting signals , which is based on spiht arithmetic , including the compression methods of small flaw signals and big flaw signals 本文着重讨论了在役管线漏磁检测信号的压缩方法：首先通过对检测信号的分析，指出了只需压缩、存储缺陷信号的研究思路；然后在对缺陷信号特征进行深入研究的基础上，提出了基于改进spiht算法的检测信号压缩方法：大缺陷信号压缩方法和小缺陷信号压缩方法。
