单模态兰姆波线形阵列传感器研制及应用  

Development and application of single mode Lamb wave linear array transducer

作　　者：焦敬品[1] 杨素方 何存富[1] 吴斌[1] Jiao Jingpin;Yang Sufang;He Cunfu;Wu Bin(College of Mechanical Engineering and Application Electronics Technology,Beifing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学机械工程与应用电子技术学院

出　　处：《仪器仪表学报》2018年第11期155-162,共8页Chinese Journal of Scientific Instrument

基　　金：国家重点研发计划(2016YFF0203002);国家自然科学基金(11572010,11772013)项目资助

摘　　要：针对兰姆波检测中的多模态现象对其缺陷检测效果的影响,进行了线形阵列单模态兰姆波选择方法研究。在对无限大板中线形阵列兰姆波传播问题理论分析的基础上,发展了一种基于遗传算法的线形阵列单模态兰姆波选择方法。在保持线形阵列激励幅值相同的情况下,通过将优化得到的时间延迟施加到线形阵列的各阵元,实现较单一模态兰姆波激励。同时,研究了激励频率对线形阵列兰姆波模态选择的影响,获得了单模态选择性较佳的检测频率;仿真和检测实验表明,通过调控线形阵列各阵元的激励时间延迟,可以较好地实现单一A0和s0检测。研究工作为超声导波模态选择提供了可行的技术手段。Aiming at the influence of multi-mode phenomenon on the defect detection performance in Lamb wave detection, in this paper the linear array single-mode Lamb wave selection method is studied. Based on the theoretical analysis of linear array Lamb wave propagation issue in infinite plate, a linear array single-mode Lamb wave selection method based on genetic algorithm is developed. Under the condition of keeping the linear array excitation amplitudes identical, the optimized time delays are applied to the elements of the linear array, therefore a single mode Lamb wave excitation is realized. Moreover, the influence of excitation frequency on linear array Lamb wave mode selection is studied, and the detection frequency for optimal single mode selection is obtained. The simulation and detection experiment results show that single A0 and S0 mode detection can be realized through controlling the excitation time delays of linear array elements. The research work provides a feasible technical means for the mode selection of ultrasonic guided wave.

关 键 词：兰姆波 模态选择 线形阵列 遗传算法 

分 类 号：TH70[机械工程—仪器科学与技术] TG156[机械工程—精密仪器及机械]