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| Amplitude detection method for the weak ultrasonic guided wave based on Duffing system chaotic characteristics |
| YAN Xiaopeng1，CHENG Mengfei2，ZHANG Weiwei3，WU Jing3，MA Hongwei3 |
1.College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2.School of Mechanics and Construction Engineering, Jinan University, Guangzhou 510632, China;
3.School of Mechanical and Engineering, Dongguan University of Technology, Dongguan 523808, China |
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Abstract When ultrasonic guided wave is used to detect small defects, the echo energy of defects is weak and the amplitude is difficult to identify accurately. A detection method based on the chaotic phase transition characteristics of Duffing system is proposed. The influence of the period number of ultrasonic guided wave on the driving force amplitude of Duffing system is analyzed, and the quantitative relationship between the driving force amplitude and the guided wave amplitude is given. First, the chaos threshold of the Duffing system is obtained by bifurcation analysis, and the amplitude detection method based on the chaotic phase transition characteristics is introduced in detail; Then, the reliability of the detection method is verified by simulation; Finally, the experimental research on ultrasonic guided wave detection of defective pipeline is carried out. The test results are compared with the theoretical values. The results show that the proposed method has strong noise immunity and weak signal sensitivity. The minimum identifiable section loss rate is 6.4%, and the maximum relative error is 7.31%, which is of great significance for evaluating the size of defects under the background of strong noise interference.
Key words: ultrasonic guided wave; detection of amplitude; Duffing system; chaos
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Received: 13 September 2021
Published: 28 November 2022
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