摘要
研究了点源、线源激光激发超声波对钢轨表面缺陷检测的影响。使用有限元法对比了这两种激发方式的声场、声波信号及对钢轨表面缺陷检测的有效性。通过有限元仿真分别对水平、垂直、斜45°的钢轨表面缺陷进行了检测并进行了实验验证。实验与仿真结果一致表明,由激光线源激发的声表面波指向性好、信号幅值大,更利于钢轨表面缺陷的检测,且对不同类型的钢轨表面缺陷均具有较好的检测能力。
The influence of ultrasonic wave excited by a laser point or line source on the detection of rail surface defects is investigated.In addition,the sound fields,acoustic signals and the detection effectiveness of rail surface defects under these two types of excitation modes are compared by the finite element method.The detection of horizontal,vertical,and oblique 45°rail surface defects is simulated by the finite element method and the corresponding experimental test is also conducted.The consistency between experimental and simulated results shows that the acoustic surface wave excited by a laser line source possesses good directionality and a high signal amplitude,which is more conducive to the detection of rail surface defects and has a good detection ability for different types of rail surface defects.
作者
隋皓
高晓蓉
罗林
朱宏娜
钟云杰
Sui Hao;Gao Xiaorong;Luo Lin;Zhu Hongna;Zhong Yunjie(School of Physical Science and Technology,South west Jiaotong University,Chengdu,Sichuan 610031,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2019年第8期150-158,共9页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61405167
61471304)
中央高校基本科研业务费专项(2018GF10)
关键词
测量
激光超声
钢轨表面缺陷
无损检测
声表面波
有限元法
measurement
laser ultrasonic
rail surface defects
non-destructive detection
acoustic surface wave
finite element method
