Prediction of Ultrasonic Guided Wave Dispersion in Bent Pipes Using Finite Element Analysis and 2-D Fourier Transform

Sung Jin Song; Young H. Kim; Joon Soo Park; Hyung Ju Yu; Yong Moo Cheong; Hyun Kyu Jung; Dong Hun Lee

doi:10.4028/www.scientific.net/KEM.297-300.2065

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 297-300Prediction of Ultrasonic Guided Wave Dispersion in...

Prediction of Ultrasonic Guided Wave Dispersion in Bent Pipes Using Finite Element Analysis and 2-D Fourier Transform

Abstract:

In this paper, the dispersion curves of a bent cylindrical pipe are obtained by using the 3-dimensional finite element modeling and 2-dimenstional Fourier transform. The transient responses of the bent pipe are calculated by using a general-purpose finite element program, and the displacements are extracted at a series of sequential points as a function of spatial position and time, u(x,t). Then 2-dimentional FFT of u (x,t) offers U (k,ω), the relation between wave number and angular frequency so that the phase velocity and group velocity can be calculated. In addition, verification of the result is made by the mode identification using wavelet transform. The modes invoked by both methods agree very well.

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Periodical:

Key Engineering Materials (Volumes 297-300)

Pages:

2065-2070

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.297-300.2065

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Online since:

November 2005

Authors:

Sung Jin Song, Young H. Kim, Joon Soo Park, Hyung Ju Yu, Yong Moo Cheong, Hyun Kyu Jung, Dong Hun Lee

Keywords:

2-D Fast Fourier Transform, Dispersion, Finite Element Model (FEM), Ultrasonic Guided Wave

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References

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