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基于扭转模式导波的电缆护套损伤检测数值模拟

Numerical simulation of cable sheath damage detection based on torsional mode guided wave.

作者信息

Zhu He, Liu Cheng, Han Zhaobing, Zhang Yue, Chen Wenlong

机构信息

School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin City, 132012, China.

出版信息

Sci Rep. 2024 Aug 29;14(1):20130. doi: 10.1038/s41598-024-70177-0.

DOI:10.1038/s41598-024-70177-0
PMID:39209897
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11362457/
Abstract

In view of the cracking, sag, and damage of sheath caused by the load effect and external force impact of power cable, the echo parameters of cable sheath damage detection based on the characteristics of torsional guided wave propagation are studied in this work. According to the Navier displacement equilibrium equation, the dispersion curve of a magnetostrictive guided wave of the cable sheath was solved, and the T(0,1) mode with a group velocity of 1198.8 m/s and no dispersion was selected. Furthermore, while considering the excitation frequency, loss rate, and direction of the damaged section, the displacement field and the echo characteristic parameters of guided wave in the cable sheath were solved. Moreover, by analyzing the time-domain signals of damaged section echo, the cubic fitting function for the loss rate of the damaged section and the damaged section echo coefficient were obtained, which can effectively characterize the quantitative relationship between the damaged location, size, and guided wave echo of the cable sheath.

摘要

针对电力电缆在载荷作用和外力冲击下护套出现的开裂、下垂及损伤等情况，本文基于扭转导波传播特性对电缆护套损伤检测的回波参数展开研究。依据纳维位移平衡方程，求解得到电缆护套磁致伸缩导波的频散曲线，并选取群速度为1198.8 m/s且无频散的T(0,1)模式。此外，在考虑激励频率、损伤段损耗率及方向的同时，求解了电缆护套中导波的位移场及回波特征参数。而且，通过分析损伤段回波的时域信号，得到了损伤段损耗率的三次拟合函数及损伤段回波系数，能够有效表征电缆护套损伤位置、尺寸与导波回波之间的定量关系。

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