摘要
探究了点聚焦探头焦点相对于球体在不同位置时的声束传播路径,讨论了进入工件内部的超声波束的聚焦与发散情况;分析计算出点聚焦探头在球体内实际焦距的表达公式,得到实际焦距与水层厚度等参数之间的关系;利用有限元分析软件建立点聚焦探头在球体内焦距变化的瞬态仿真模型,仿真结果与理论公式计算得到的结果基本一致;最后,通过实际焦距表达式确定了检测不同半径钢球的点聚焦探头的选型和水层厚度,实验现象验证了结果的可靠性。
Firstly,the propagation path of sound beam was researched when the focus of ultrasonic pointfocusing probes was at different positions of the sphere. Focus and divergence of ultrasonic beams enteringworkpiece were discussed. Next,the expression formula of actual focal length of point focusing probes in thesphere was calculated and analyzed. The relationship among actual focal length and thickness of water layerand other parameters was presented. Then,a transient simulation model of focal length changes of ultrasonicpoint focusing probes in the sphere was established by finite element analysis software. The simulation resultsare in good agreement with the calculated ones. Finally,actual focal length formula was used to determine thetype of point focusing probes and water layer thickness when detecting different radii of spheres. Experimentalphenomena show the reliability of results.
作者
濮海明
王哲
康宜华
PU Haiming;WANGZhe;KANGYihua(School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, 43007)
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2018年第11期1268-1273,共6页
China Mechanical Engineering
基金
国家自然科学基金资助项目(51275193)
关键词
点聚焦探头
球体
焦距
声束路径
point focusing probe
sphere
focal length
sound beam path