北京航空航天大学学报 ›› 2015, Vol. 41 ›› Issue (6): 1000-1006.doi: 10.13700/j.bh.1001-5965.2014.0519

• 论文 • 上一篇    下一篇

基于动态孔径聚焦的L型构件相控阵超声检测

徐娜1, 何方成1, 周正干2   

  1. 1. 中航工业北京航空材料研究院, 北京 100095;
    2. 北京航空航天大学 机械工程及自动化学院, 北京 100191
  • 收稿日期:2014-08-22 出版日期:2015-06-20 发布日期:2015-07-30
  • 通讯作者: 徐娜(1985—),女,河北邢台人,工程师,bjxuna@163.com,主要研究方向为超声无损检测. E-mail:bjxuna@163.com

Ultrasonic phased array inspection of L-shaped components based on dynamic aperture focusing

XU Na1, HE Fangcheng1, ZHOU Zhenggan2   

  1. 1. AVIC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
    2. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2014-08-22 Online:2015-06-20 Published:2015-07-30

摘要: 由于L型构件界面形状复杂,当采用基于全矩阵数据的全聚焦方法时,声波在试样中的传播路径十分复杂,增加了试样中超声传播时间的计算难度.为了解决上述问题,提出了一种根据实际被测对象并使用全矩阵数据的动态调整聚焦方案的"动态孔径聚焦方法";然后,针对L型构件的型面特征,制定了动态孔径聚焦检测方案,并提出了基于Snell定律的声波传播时间计算方法;最后,通过时域有限差分数值仿真方法模拟全矩阵数据,验证了所提出聚焦方法的正确性;定制L型金属试样进行检测实验,检测结果与实际试样参数一致.研究表明:所提出的动态孔径聚焦方法可实现对L型构件的有效检测.

关键词: 相控阵, 超声检测, L型构件, 虚拟聚焦, 动态孔径

Abstract: When L-shaped component is detected by ultrasonic phased array inspection technique based on total focusing method, wave propagation path in the specimen became more complex to increase the computational difficulty of propagation time due to the complicated geometries of component. To solve this problem, a dynamic aperture focusing method, adjusting focusing program according to actual samples dynamically, was proposed on the basis of the total focusing method using full matrix data. Then, the dynamic aperture focusing program was designed for the surface characteristics of L-shaped components. A calculation method of wave propagation time was posed up based on the Snell's principle. Finally, a couple of full matrix data was simulated using the finite-difference time domain method to validate the dynamic aperture focusing method. The inspection experiment was carried out to image the defect in customized L-shaped metal specimen, yielding experiment results that are in good quantitative agreement with the true values. The results show that it is feasible and effective for dynamic aperture focusing method to test the L-shaped components.

Key words: phased array, ultrasonic testing, L-shaped components, virtual focusing, dynamic aperture

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