NUMERICAL SIMULATION OF THE OBLIQUE DEFECT IN THE PIPES USING VAN DER POL OSCILLATOR BASED ON ULTRASONIC GUIDED WAVE

被引：0
|
作者：
Yang Fei [1 ]
Wu Jing [1 ]
Wen Yuli [1 ]
Nie Zhenhua [1 ]
Ma Hongwei [2 ,3 ]
机构：
[1] Jinan Univ, Coll Sci & Engn, Guangzhou 510632, Guangdong, Peoples R China
[2] Jinan Univ, Moe Key Lab Disaster Forecast & Control Engn, Guangzhou 510632, Guangdong, Peoples R China
[3] Qinghai Univ, Sch Civil Engn, Xining 810016, Peoples R China
来源：
PROCEEDINGS OF THE 22ND INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: MAJOR CHALLENGES IN ACOUSTICS, NOISE AND VIBRATION RESEARCH, 2015 | 2015年
基金：
国家教育部博士点专项基金资助; 中国国家自然科学基金;
关键词：
LAMB WAVES; MODE; INSPECTION;
D O I：
暂无
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
The ultrasonic longitudinal guided waves in oblique defected pipes were investigated using finite element software LS-DYNA in this paper. A novel inspection method was proposed based on the Van der Pol oscillator. Five kinds of defects with inclined angle of 0 degrees, 30 degrees, 45 degrees, 60 degrees and 90 degrees were analyzed, respectively. Numerical results show that the proposed method could be used to inspect weaker guided waves, and the amplitude of echo increases with the decrease of the inclined angle. The results are worthy of engineering application in both extending guided waves detection range and increasing the sensitivity of detecting micro oblique defect.
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页数：8
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