摘要
无损检测中使用的声发射(acoustic emission,AE)主要是通过分析机械结构中传播的弹性波,利用生成的声波携带的信息可以确定结构的完整性。为了实现对仪器损伤的精准定位,本文提出将正交光纤光栅(fiber Bragg grating,FBG)传感器网络及其对称三角形布置应用于声发射定位方法,有效减少由FBG轴和声波传播方向之间夹角造成的误差。该方法基于小波变换,利用声发射源形成的兰姆波中不同频率波到达的相对时间差来求解声发射信号,并采用建立的椭圆算法实现对声发射源的定位,实验最终得到平均误差为2.95 cm。本文还探究了声发射源距离对传感器接收信号的影响。该研究对仪器损伤及缺陷定位有较大意义。
Acoustic emission(AE)used in non-destructive testing primarily involves analyzing elastic waves propagating within mechanical structures.The integrity of the structure can be assessed by using the information carried by the generated acoustic waves.To achieve precise localization of instrument damage,this paper proposes a method using an orthogonal fiber Bragg grating(FBG)sensor network with a symmetrical triangular arrangement for acoustic emission localization.This approach effectively reduces errors caused by the angle between the FBG axis and the direction of sound wave propagation.Based on wavelet transform,the relative time difference between the arrival of different frequency components in the Lamb wave generated by the acoustic emission source is used to analyze the acoustic emission signal.An established ellipse algorithm is then employed to locate the acoustic emission source.Experimental results demonstrate an average localization error of 2.95 cm.This study also investigates the impact of the distance between the acoustic emission source and the sensor on the received signal.This research holds significant implications for the localization of damage and defects in instruments.
作者
刘玉冰
陶传义
蒋宇飞
吴怡然
王威
钟祝强
LIU Yubing;TAO Chuanyi;JIANG Yufei;WU Yiran;WANG Wei;ZHONG Zhuqiang(Chongqing Key Laboratory of New Energy Storage Materials and Devices,Chongqing University of Technology,Chongqing 400054,China)
出处
《光电子.激光》
北大核心
2025年第6期616-623,共8页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(62205040,51874064)
重庆理工大学研究生创新项目(gzlcx20232090,gzlcx20233340)资助项目。
