高温铝合金仅线圈式电磁超声检测方法研究  

Study on Coil-only Electromagnetic Ultrasonic Testing Method for High-Temperature Aluminum Alloy

作　　者：石文泽[1] 邵纬桑 卢超[1] 张路根 张琦 刘远 SHI Wenze;SHAO Weisang;LU Chao;ZHANG Lugen;ZHANG Qi;LIU Yuan(Key Laboratory of Nondestructive Testing of Ministry of Education,Nanchang Hangkong University,Nanchang 330063;Jiangxi General Institute of Testing and Certification Special Equipment Inspection&Research Institute,Nanchang 330036)

机构地区：[1]南昌航空大学无损检测技术教育部重点实验室,南昌330063 [2]江西省检验检测认证总院特种设备检验检测研究院,南昌330036

出　　处：《机械工程学报》2025年第6期79-91,共13页Journal of Mechanical Engineering

基　　金：江西省重点研发计划(20223BBE51034);江西省主要学科学术和技术带头人培养计划(20225BCJ23023);国防基础科研计划(JCKY2022401C005);南昌航空大学研究生创新专项资金(YC2022-s743)资助项目。

摘　　要：针对传统永磁铁式电磁声换能器(Electromagnetic acoustic transducer,EMAT)在高温检测时永磁体的磁感应强度降低、带有水冷装置的EMAT探头体积庞大难以适合狭窄区域检测、永磁体易吸附铁磁性颗粒导致换能效率下降甚至功能性损坏等问题,提出了一种高温仅线圈式电磁超声技术、检测电路与建模方法。以仅螺旋线圈式EMAT为例,搭建了仅线圈式EMAT检测电路,并对高温检测过程进行场路耦合有限元分析,研究了温度对仅线圈式EMAT的检测电路放电电流、激励效率、超声传播特性和接收效率的影响规律。结果表明,影响高温检测回波幅值的因素按贡献比例排序依次为:介质衰减、激励效率、接收效率、扩散衰减、单位力激发超声波位移幅值。所研制的仅线圈式EMAT检测系统可以实现450℃高温铝合金试样持续检测,且二次底波的信噪比不小于16.86 dB。In response to the problem of a reduction in magnetic induction intensity when a traditional permanent magnet electromagnetic acoustic transducer(EMAT)is used in high-temperature detection,the EMAT probes with water-cooled devices are bulky and unable to detect in narrow areas,and magnets easily adsorbing ferromagnetic particles,resulting in a decrease in conversion efficiency,A coil-only EMAT technique,its detection circuit and modeling method are proposed.Taking the coil-only spiral coil EMAT as an example,the coil-only EMAT detection circuit was constructed,and a field-circuit coupled finite element model analysis was conducted on the high-temperature detection process.The influence of temperature on circuit characteristics,excitation efficiency,ultrasonic propagation characteristics,and reception efficiency of the coil-only EMAT was studied.The results show that the factors that affect the amplitude of high-temperature detection echoes are ranked in order of contribution ratio:medium attenuation,excitation efficiency,reception efficiency,diffusion attenuation,and unit-force-excited ultrasonic displacement amplitude.The developed coil only EMAT detection system can achieve continuous detection of 450℃high-temperature aluminum alloy samples,and the signal-to-noise ratio of the secondary bottom wave is not less than 16.86 dB.

关 键 词：电磁声换能器 仅线圈式EAMT 铝合金 高温检测 场路耦合分析 

分 类 号：TB552[理学—物理]