用于电磁声发射的脉冲激励源设计  

Design of Pulse Excitation Source for Electromagnetic Acoustic Emission

作　　者：张闯[1] 李乘风 刘素贞[1] 肖洋[1] 杨庆新[1,2] Zhang Chuang;Li Chengfeng;Liu Suzhen;Xiao Yang;Yang Qingxin(Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability,Hebei University of Technology,Tianjin,300130,China;Key Laboratory of Advanced Electrical Engineering and Energy Technology,Tianjin Polytechnic University,Tianjin,300387,China)

机构地区：[1]河北工业大学电磁场与电器可靠性省部共建重点实验室,天津300130 [2]天津工业大学电工电能新技术天津市重点实验室,天津300387

出　　处：《电工技术学报》2017年第A01期203-208,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51307043);河北省自然科学基金(E2016202260;E2017202055);天津市自然科学基金(16JCYBJC19000)资助项目

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。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 electromagneticacoustic emission.Pulse excitation as the core of electromagnetic loading,the frequency and amplitudeof its output current have significant effects on loading effect.In order to meet the requirements ofimpulse excitation for electromagnetic loading experiment,an adjustable regulated power supply basedon half bridge switching circuit principle and a charge and discharge circuit with capacitor as energystorage were designed.Pulse current with adjustable frequency and amplitude was produced bycontrolling charge and discharge process of capacitor through MCU system.The result of theelectromagnetic loading experiment shows that the excitation source meets design requirements.

关 键 词：电磁加载 脉冲激励源 可调稳压源 充放电回路 

分 类 号：TM833[电气工程—高电压与绝缘技术]