The characteristics of acoustic wave propagation along the non-periodic ideal drill strings

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (1) : 72-75.

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The characteristics of acoustic wave propagation along the non-periodic ideal drill strings

ZHANG Mei-ling; YAN Xiang-hong; LIU Wen-li; SU Yuan-da; CHEN Xue-lian; LU Bin

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Abstract

The non-periodic structure’s dispersion equation and the sound attenuation equation have been given based on the one-dimensional model of sound propagation. The relationship between the geometry parameters of drill strings with the dispersion characteristic as well as the attenuation characteristic is investigated numerically for a non-periodic drill string system, and the FEM software- ANSYS were used to confirm the theory results. The results shows that the dispersion characteristic of a non-periodic drill string system is identical with the result from of 'and' operation of dispersion characteristic of multiple periodic structure systems．The non-periodic structure’ passband is narrow while the stopband is wide, If the sound wave frequency were in the stopband, the acoustic attenuation would be larger than it in passband.

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non-periodic structure / dispersion characteristic / acoustic attenuation coefficient / drill string system

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ZHANG Mei-ling;YAN Xiang-hong;LIU Wen-li;SU Yuan-da;CHEN Xue-lian;LU Bin. The characteristics of acoustic wave propagation along the non-periodic ideal drill strings[J]. Journal of Vibration and Shock, 2012, 31(1): 72-75