A method for low frequency scattering sound field prediction based on fluid-structure interaction

TANG Yongzhuang, ZHOU Qidou, XIE Zhiyong, LIU Wenxi, ZHAO Peng

Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (17) : 78-85.

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PDF(3377 KB)
Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (17) : 78-85.

A method for low frequency scattering sound field prediction based on fluid-structure interaction

  • TANG Yongzhuang, ZHOU Qidou, XIE Zhiyong, LIU Wenxi, ZHAO Peng
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Abstract

A method is purposed to predict the scattering acoustic pressure with fluid-structure interaction at low frequency. Based on the boundary integral equation, the formula coupled with fluid and structure in elastic scattering is established, then the concept of added mass, added damp and added pressure are used to solve the coupled equation. The relationship between rigid scattering and elastic scattering is studied, and the elastic scattering acoustic pressure is the superposition of rigid scattering and secondary radiation. Different with radiation, the effect of fluid acted on structure includes add pressure besides added mass and damp in scattering problem. The boundary element program is coded by FORTRAN and the DMAP of NASTRAN is used to connect the code with NASTRAN. Comparing the theoretical data and numerical result, the method is verified in this paper. The scattering pressure of cylinder with rib is computed, and the numerical results show that: The elastic effect cannot be ignored for scattering at low frequency. The thickness of shell has influence on scattering intensity and directivity patterns obviously while the effect of rib depends on the vibrational shape at particular frequency.

Key words

the prediction of acoustic scattering / boundary integral equation / fluid-structure coupling / DMAP language

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TANG Yongzhuang, ZHOU Qidou, XIE Zhiyong, LIU Wenxi, ZHAO Peng. A method for low frequency scattering sound field prediction based on fluid-structure interaction[J]. Journal of Vibration and Shock, 2023, 42(17): 78-85

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