Vbration &amp; acoustic response characteristics of a stiffened plate stimulated by turbulent boundary layer wall pressure fluctuation

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (14) : 156-163.

Vbration & acoustic response characteristics of a stiffened plate stimulated by turbulent boundary layer wall pressure fluctuation

XU Jiaqi,MEI Zhiyuan,LI Huadong,ZHOU Zhenlong

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Abstract

While transportation vehicles such as ships，auto-mobiles and airplanes travel fast，the inward sound radiated by their outer surface vibration would become a vital part of the self-noise，this kind of vibration is induced by turbulent boundary layer wall pressure fluctuation．Structural vibration responses were calculated based on the modal summation．The Corcos model was used to estimate the power spectra of the turbulent boundary layer wall pressure fluctuation in the calculation of the vibration and inward sound radiation of a simply supported plate stimulated by outer air or water flow turbulent boundary layer.The calculation results fit well with analytical and experimental ones，which proves the validity of the method．Moreover, an improved Corcos model was used to estimate once more the power spectra，and the vibration and inward sound radiation characteristics of the simply supported plate stimulated by outer water flow turbulent boundary layer were investigated．The results indicate that, attributing to the low Mach number of the water flow，the convective wave number of wall fluctuating pressure is far greater than the plate structure flexural wave number，thus the stimulation caused by the convective ridge of the wave number-frequency spectra of wall fluctuating pressure could be neglected.Span-wise or stream-wise stiffeners do little effect on plate velocity auto-spectra.Decreasing the panel aspect ratio and properly increasing the panel stream-wise length would cause evident decrease on the plate radiated sound power above 2 000 Hz．

Key words

turbulent boundary layer；wall pressure fluctuation；random vibration；flow-induced plate vibration & / noise

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XU Jiaqi,MEI Zhiyuan,LI Huadong,ZHOU Zhenlong. Vbration & acoustic response characteristics of a stiffened plate stimulated by turbulent boundary layer wall pressure fluctuation[J]. Journal of Vibration and Shock, 2020, 39(14): 156-163

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