Image Reconstruction of Blockage in the Continuous and Stepped Pipelines by Noninvasive Acoustic Method

Abstract:

The image of a semi-circular blockage and location in the uniform and stepped pipe was reconstructed by measuring the eigen-frequency shift of the resonance and anti-resonance frequencies of multi-sine acoustic waves. In this study we have used different boundary conditions from previous works of Wu and Fricke [1] and De Salis and Oldham [2] to determine the blockage cross-sectional area and position. The results agreed with real fractional cross sectional area and position in the both continuous and stepped pipes. New approach showed a better quality of reconstructed image with small ripple number and the false dummy blockage signal was also reduced. The present method of blockage image reconstruction is a noninvasive nondestructive and can meet the integrity evaluation implementation for all types of transmission pipeline

• Periodical: Key Engineering Materials (Volumes 321-323)
• Pages: 1640-1643
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.321-323.1640
• Online since: October 2006
• Authors: Sung Soo Jung, S.I. Cho, Young Tae Kim, C.U. Cheong, Ho Chul Kim
• Keywords: Blockage, Duct, Eigen-Frequencies

References

[1] Q. Wu and F. Fricke: Journal of the Acoustical Society of America Vol. 87(1990), p.67.

[2] M.H.F. De Salis and D. J. Oldham: Journal of Sound and Vibration Vol. 221(1999), p.180.

[3] Q. Wu : Applied Acoustics Vol. 41 (1994), p.229.

[4] M.H.F. De Salis and D. J. Oldham: Journal of Sound and Vibration Vol. 243(2001), p.625.

0 0 . 2 0 . 4 0 . 6 0 . 8 1 . 0 1 . 2 1 . 4 1 . 6 1 . 8 2 . 0.

0.

1.

2.

3.

4.

5.

6.

7.

8.

9.

[1] 0 D is ta n c e X [m ].

0 0 . 2 0 . 4 0 . 6 0 . 8 1 . 0 1 . 2 1 . 4 1 . 6 1 . 8 2 . 0.

0.

1.

2.

3.

4.

5.

6.

7.

8.

9.

[1] 0 Sb / S0.

0 0 . 2 0 . 4 0 . 6 0 . 8 1 . 0 1 . 2 1 . 4 1 . 6 1 . 8 2 . 0.

0.

1.

2.

3.

4.

5.

6.

7.

8.

9.

[1] 0 (c ) P re s e n t m e th o d (b ) S a lis m e th o d (a ) W u m e th o d.