Denoising measures against aeolian noise of smooth circular cylinders

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (23) : 52-57.

SHEN Guohui1, ZHANG Yang1, ZHENG Chong2, SONG Gang3, WANG Yiwen3

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Abstract

In order to reduce aeolian noise of smooth circular cylinders, multiple denoising measures were systematically studied.Aeolian noise characteristics of smooth circular cylinders were obtained with acoustic wind tunnel tests.Three kinds of noise suppression measures including winding spiral, protruding pitch diameter and adding axial additional line were tested for noise reduction effect of multiple groups of parameters.Wind noise spectrum and A-weighted total sound pressure level of cylinder before and after adding noise suppression measures were compared.Finally, suggestions for noise reduction measures of smooth cylinder were proposed.Results showed that the predominant frequency of cylindrical wind noise increases linearly with increase in wind speed, Strouhal number of inverse calculation of predominant frequency is 0.197-0.200; for noise suppression measures of smooth cylinder, the noise reduction effect of winding disturbing streamline is the best, followed by that of adding pitch protrusion, and the noise reduction effect of adding additional line along axial direction is the worst, and even wind noise increases; for smooth cylinder with diameter of about 24 mm, it is recommended to use a single circular spoiler with diameter of 4 mm and a spacing of 10 cm; if two disturbing streamlines are arranged side by side, better noise reduction effect can be obtained.

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smooth circular cylinder / aeolian noise / acoustic wind tunnel / wind tunnel tests / denoising measure

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SHEN Guohui1, ZHANG Yang1, ZHENG Chong2, SONG Gang3, WANG Yiwen3. Denoising measures against aeolian noise of smooth circular cylinders[J]. Journal of Vibration and Shock, 2020, 39(23): 52-57

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