电磁超声兰姆波换能器多目标优化设计  

Multi-objective optimization of Lamb wave electromagnetic acoustic transducer

作　　者：康磊[1] 张晓辉[1] 张雨平[2] 程辉[2] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001 [2]东北轻合金有限责任公司,哈尔滨150060

出　　处：《声学技术》2012年第5期535-538,共4页Technical Acoustics

基　　金：国防科技工业技术基础重点科研项目资助(B1220102302);中央高校基本科研业务费专项基金项目资助(HIT.NSRIF.2012008);中国博士后科学基金资助项目资助(2012M51092)

摘　　要：针对电磁超声兰姆波换能器激发的兰姆波存在多模式、频散现象和信号较弱的问题,结合铝合金板材检测背景,提出一种基于"双交点法"、"零斜率准则"和正交试验设计相结合的电磁超声兰姆波换能器多目标优化设计方法。其中,"双交点法"可有效削弱兰姆波多模式现象的影响,"零斜率准则"能够有效降低兰姆波的频散现象,而正交试验设计方法可有效提高电磁超声兰姆波信号的幅值。依据所提优化设计方法,对一个在铝板检测中常用的电磁超声兰姆波换能器的9个主要参数进行了多目标优化设计。实验表明,优化后,兰姆波信号中的多模式、频散现象得到显著抑制,而且信号幅值得到明显提升,有效改善了电磁超声兰姆波换能器的工程实用性。To minimize the multi-modes and dispersion phenomena and to enhance the signal strength of Lamb wave Electromagnetic Acoustic Transducer（EMAT）,this paper proposes a multi-objective optimization method for Lamb wave EMAT based on the combination of the ＂two-intersection-points＂ method and ＂zero-slope＂ criterion with the orthogonal test method.The ＂two-intersection-points＂ method and the ＂zero-slope＂ criterion can effectively minimize the influence of multi-modes and the dispersion phenomena of Lamb waves respectively;and the orthogonal test method is able to enhance the signal strength of Lamb wave signals.Nine prime parameters of a Lamb wave EMAT which is commonly used for the inspection of aluminum plates are optimized based on the proposed multi-objective optimization method.Experiments show that after optimization,not only the multi-modes and the dispersion phenomena are notably depressed,but also the signal strength is greatly enhanced,which significantly improves the practicability of the transducers.

关 键 词：电磁超声兰姆波换能器 多模式现象 频散现象 正交试验设计 

分 类 号：TG115.28[金属学及工艺—物理冶金]