군속도 변화를 이용한 배관 두께 측정
Estimation of the Pipe Thickness using the Variation of the Group Velocity
0
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
This paper proposes the technique of estimating the pipe thickness using the measured group velocity. To measure the group velocity from the accelerometer data in the frequency domain, Wigner-Ville distribution is utilized, which interprets the waveform of the shock wave. Using this measured group velocity, this paper proposes the technique to estimate the thickness of pipes with the impact on the pipe. The group velocity is estimated by the modeling correlation between the group velocity and the thickness of the pipe based on the propagation velocities. The correlation model between thickness and group velocity has been proved through the real experiments. The measured group velocity in the frequency-domain is the maximum at the center frequency of the bending waves in the modeling of the group velocity. In addition to these, a smoothing technique for analyzing lamb wave Wigner-Ville distribution has been introduced to improve the reliability of the data acquisition.
Abstract
This paper proposes the technique of estimating the pipe thickness using the measured group velocity. To measure the group velocity from the accelerometer data in the frequency domain, Wigner-Ville distribution is utilized, which interprets the waveform of the shock wave. Using this measured group velocity, this paper proposes the technique to estimate the thickness of pipes with the impact on the pipe. The group velocity is estimated by the modeling correlation between the group velocity and the thickness of the pipe based on the propagation velocities. The correlation model between thickness and group velocity has been proved through the real experiments. The measured group velocity in the frequency-domain is the maximum at the center frequency of the bending waves in the modeling of the group velocity. In addition to these, a smoothing technique for analyzing lamb wave Wigner-Ville distribution has been introduced to improve the reliability of the data acquisition.
참고문헌 (14)
- Sun Li‐ying, "Research on Transducer and Frequency of Ultrasonic Guided Waves in Urban Pipe Inspection", ICIEA 2009, pp.2708~2711 (2009)
- 안연식, "유도초음파를 이용한 장거리 배관 진단기술 개발에 관한 연구", 전력기술개발 종합발표회, pp.62~66 (2007)
- 박진호, "원전의 압력경계 구조물에서 위그너‐빌 분포를 이용한 충격 발생위치 추정", 박사, pp.2006
- I. A. Viktorov, "Rayleigh and Lamb Waves", pp.67~102 (1967), Plenum press
- L. Cremer, "Structure‐Borne Sound", pp.101~ (1998), Springer‐Verlag
- W. Soedel, "Vibrations of shells and plates", 67~102 (1967)
- D.Gabor, "Theory of communication", Journal of the Institute of Electrical Engineers, 93(3), pp.429~457 (1946)
- Yekutiel Avargel, "System Identification in the Short‐Time Fourier Transform Domain With Crossband Filtering", IEEE transactions on Audio, Speech, and Language processing, 15(4), pp.1305~1319 (2007)
- O. Rioul, "Wavelet transforms in signal processing", IEEE Signal Processing Mag. (1991)
- Shie Qian, "Introduction to time‐frequency and wavelet transforms" (2002), Prentice Hall PTR
- E.Wigner, "On the quantum correction for thermodynamic equilibrium", Physical Review, 40, pp.749~759 (1982)
- F. Hlawatsch, "Linear and quadratic time frequency signal representations", IEEE magazine, pp.21~67 (1992)
- Edmundo Pereira de Souza Neto, "Smoothed pseudo Wigner–Ville distribution as an alternative to Fourier transform in rats", Autonomic Neuroscience, 87(2), pp.258~267 (2001)
- C.M.Harris, "Shock and Vibration Handbook", ~ (1988)