Experimental study on the properties of aeolian noise generated by transmission lines with different external diameters

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (6) : 40-45.

ZHU Yunxiang1,SHEN Guohui2,CHEN Liangjin1,GAO Zhilin3,ZHANG Yang2

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Abstract

In order to study the aeolian noise generated by transmission lines with different external diameters at different wind speeds, aeolian noise experiments of five kinds of transmission lines at four different wind velocities were carried out. The spectrum characteristics, peak frequency and corresponding Strouhal Number of the aeolian noises were analyzed. The overall sound pressure level and A-weighted overall sound pressure level were also studied. Finally, the aeolian noise of transmission lines and smooth circular cylinders with nearly the same external diameters were compared. The results show that the aeolian noise of transmission lines is mainly generated from the vortex-shedding of the passing flow, resulting in the fact that the peak frequency is very close to the vortex-shedding frequency. The Strouhal Number of the aeolian noises of transmission lines shows a rising trend with the increase of the Reynolds number. The A-weighted overall sound pressure level of aeolian noise of transmission lines increases with the increase of the wind speed and decreases with the increase of the external diameter. The A-weighted sound pressure level of transmission lines is smaller than that of smooth circular cylinders with the same external diameters in higher wind speed condition, and the difference between them will become larger if the wind speed increases.

Key words

transmission lines / aeolian noise / acoustic wind tunnel / wind tunnel testing / sound pressure level

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ZHU Yunxiang1,SHEN Guohui2,CHEN Liangjin1,GAO Zhilin3,ZHANG Yang2. Experimental study on the properties of aeolian noise generated by transmission lines with different external diameters[J]. Journal of Vibration and Shock, 2019, 38(6): 40-45

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