航空学报 > 2003, Vol. 24 Issue (4): 301-305

航空制件超声检测中的声场特性分析

彭应秋1, 郑初华1, 李坚1, 权义萍1, 石剑2   

  1. 1. 南昌航空工业学院, 江西南昌 330034;2. 南方动力公司, 湖南株州 412000
  • 收稿日期:2002-08-15 修回日期:2003-01-18 出版日期:2003-08-25 发布日期:2003-08-25

Character Analysis for Acoustic Field in Ultrasonic Testing of Aeronautical Products

PENG Ying-qiu1, ZHENG Chu-hua1, LI Jian1, QUAN Yi-ping1, SHI Jian2   

  1. 1. Nanchang Institute of Aeronautical Technology; Nanchang 330034; China;2. Nanfang Dynamical Corp.; Zhuzhou 412000; China
  • Received:2002-08-15 Revised:2003-01-18 Online:2003-08-25 Published:2003-08-25

摘要: 针对航空制件超声检测中影响缺陷定量准确性的声场问题进行了深入讨论, 研究了脉冲波声场的计算方法, 设计了相应的计算软件并绘制出实用换能器声轴线上的声压分布曲线, 分析了不同材料和厚度的采样回波对频谱的影响, 比较了连续波声场和脉冲波声场的分布特性及异同点。研究结果为提高超声检测中缺陷定量的准确性和科学性提供了依据。

关键词: 航空制件, 超声检测, 脉冲波声场, 声压分布, 缺陷当量, 超声换能器

Abstract: In t his paper, deeply discussed is the acoustic field char acter of the ultrasonic pulse wave in ultrasonic testing of aeronaut ical pr oducts. It is known t hat the field character influences greatly the accuracy of flaw equivalent in t he testing. The method of calculating the acoustic field of pulse ultr asonic wave is resear ched and the relat ive special-purpose softwar e is designed; the distribution of acoustic pressure on t he axis of the commercial ultrasonic tr ansducer is calculated and plotted in the light of computer and the software. It is discussed how the spectrum of the bottom echoes is influenced by mater ials and thickness. The acoustic field character of the pulse wave r adiated by the commer cial transducer is compared wit h that of an ideal continuous mono-frequency wave. The results provide the scientific basis for improvements of accur acy of the flaw equivalent in ultrasonic test ing.

Key words: aeronautical products, ultrasonic testing, acoustic field of ultrasonic pulse wave, distribution of acoustic pressure, flaw equivalent, ultrasonic transducer

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