作者：魏建林¹, 周阳², 杨晓辉¹, 刘懿莹², 张逸凡¹, 付文成²

作者单位：1. 国网河南省电力公司电力科学研究院，河南 郑州 450052;
2. 西安交通大学电气工程学院，陕西 西安 710049

关键词：微纳耦合光纤传感器;模态声发射;线性定位;对比分析

摘要：

基于微纳耦合光纤传感器(MFCS)的S₀A₀峰值定位法可以实现对模态声发射源的线性定位，但是定位范围和精度有待提高。首先，针对已有S₀A₀线性定位方法中计算频率的选择进行改进，不同于之前算法中两种模态采用同一频率，改进后算法是根据S₀和A₀两种模式的最大能量分别选择计算频率。然后，基于改进后的方法进行定位实验，结果表明：与改进前的方法相对比，改进后的S₀A₀线性定位方法不仅具有较好的重复性，而且将定位范围从5~40 cm增加到5~60 cm，有效的定位角度范围从45°~135°扩大到22.5°~155.5°，同时相对误差也从原来的1.9%~20.9%降低到0.6%~4.65%。定位误差主要来源于Gabor时频变换的时间分辨率，以及实际铝板的群速度曲线与计算所得值之间存在偏差。

An improved linear positioning method for modal acoustic emission source
WEI Jianlin¹, ZHOU Yang², YANG Xiaohui¹, LIU Yiying², ZHANG Yifan¹, FU Wencheng²
1. Electric Power Research Institute, State Grid Henan Electric Power Company, Zhengzhou 450052, China;
2. School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Abstract: The S₀A₀ peak positioning method based on the microfiber coupler sensor (MFCS) can be applied to the linear positioning of the modal acoustic emission source, but the positioning range and accuracy need to be improved. First, the calculation frequency selection of an existing S₀A₀ linear positioning method was improved, different from the calculation frequency selection of previous method, which the same calculation frequency is selected for both modes, the calculation frequency of the improved method is selected respectively according to the maximum energy of the S₀ mode and the A₀ mode. Then, based on the improved method, the positioning experiment was carried out. The results show that compared with the previous method, the improved S₀A₀ linear positioning method not only has good repeatability, but also increases the positioning range from 5-40 cm to 5-60 cm. The effective positioning angle range has also been expanded from 45°-135° to 22.5°-155.5°, and the relative error has also been reduced from the original 1.9%-20.9% to 0.6%-4.65%. The positioning error mainly comes from the time resolution of Gabor time-frequency transform and the deviation between the group velocity curve of the actual aluminum plate and the calculated value.
Keywords: microfiber coupler sensor (MFCS);modal acoustic emission;linear positioning;comparative analysis
2020, 46(11):10-15  收稿日期: 2020-03-28;收到修改稿日期: 2020-05-17
基金项目: 国网河南省电力公司电力科学研究院科技项目(SGHADKOOPJJS1900173)；陕西省自然科学基础研究计划资助项目(2019JM-479)
作者简介: 魏建林(1980-),男,河南灵宝市人,高级工程师,博士,主要从事新型传感与监测技术方面的工作
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