用于电磁声发射的脉冲激励源设计

doi:10.19595/j.cnki.1000-6753.tces.170205

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摘要对金属结构进行电磁加载,会在裂纹处产生应力波信号,利用该现象可以实现对金属缺陷的无损检测,即电磁声发射技术。脉冲激励源作为电磁加载的核心,其输出电流的频率、幅值等参数对加载效果有显著影响。针对电磁加载实验中对激励源的要求,设计基于半桥型开关电路原理的可调稳压电源、以电容器作为储能元件的充放电回路,并利用单片机实现对电容充放电过程的调控,以产生频率和幅值可调的脉冲电流。将激励源应用于电磁加载实验,输出结果达到了设计要求。

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	张闯
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关键词 ：电磁加载, 脉冲激励源, 可调稳压源, 充放电回路

Abstract：Electromagnetic loads of metal structures will produce stress wave signal at the crack, this phenomenon can be used to non-destructive testing of metal defects,which is electromagnetic acoustic emission. Pulse excitation as the core of electromagnetic loading, the frequency and amplitude of its output current have significant effects on loading effect. In order to meet the requirements of impulse excitation for electromagnetic loading experiment, an adjustable regulated power supply based on half bridge switching circuit principle and a charge and discharge circuit with capacitor as energy storage were designed. Pulse current with adjustable frequency and amplitude was produced by controlling charge and discharge process of capacitor through MCU system. The result of the electromagnetic loading experiment shows that the excitation source meets design requirements.

Key words： Electromagnetic load pulse excitation source adjustable voltage source charge and discharge circuit

收稿日期: 2017-02-05 出版日期: 2017-09-14

PACS:

TM833

基金资助:国家自然科学基金（51307043）、河北省自然科学基金（E2016202260, E2017202055）和天津市自然科学基金（16JCYBJC19000）资助项目

通讯作者: 李乘风男,1991年生,硕士研究生,主要研究方向为电磁无损检测。E-mail: 542491445@qq.com

作者简介: 张闯男,1982年生,博士,副教授,主要从事电磁无损检测与评估方面的研究工作。E-mail: czhang@hebut.edu.cn

引用本文:

张闯, 李乘风, 刘素贞, 肖洋, 杨庆新. 用于电磁声发射的脉冲激励源设计[J]. 电工技术学报, 2017, 32(增刊1): 203-208. Zhang Chuang, Li Chengfeng, Liu Suzhen, Xiao Yang, Yang Qingxin. Design of Pulse Excitation Source for Electromagnetic Acoustic Emission. Transactions of China Electrotechnical Society, 2017, 32(增刊1): 203-208.

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