Analysis on nonstationary strong wind characteristics over an open flat terrain

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (23) : 68-73.

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Analysis on nonstationary strong wind characteristics over an open flat terrain

ZHANG Shao-feng1, LOU Wen-juan2, LV Zhong-bin1DUAN Zhi-yong2, HUANG Ming-feng2

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Abstract

The turbulent characteristics of nonstationary strong wind are analyzed based on field measured wind records of 1128-h long, collected at a height of 10 meters over an open flat terrain. According to the assumption that the average wind speed component was deterministic time-varying in a time interval, a nonstationary wind model was proposed and then applied to find its turbulent characteristics. The results were compared with those calculated by a stationary wind model, in which the average wind speed component was assumed constant. It is found that 55% samples of wind records are nonstationary, and the nonstationary wind model is more appropriate for charactering wind speed. The variations of turbulent characteristics for wind speed were studied, and it shows that the turbulent intensity seems to have no significant relationship with wind speed and mainly distributes within 0.16~0.20, a value slightly greater than that given in wind load codes; the gust factor decreases while wind speed increases, the turbulent integral scale the opposite; Davenport spectrum tends to be more accurate to characterize the energy distribution than other wind spectra.

Key words

field measurements / empirical mode decomposition / wind speed models / non-stationarity / turbulent characteristics

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ZHANG Shao-feng;LOU Wen-juan;LV Zhong-binDUAN Zhi-yong;HUANG Ming-feng. Analysis on nonstationary strong wind characteristics over an open flat terrain[J]. Journal of Vibration and Shock, 2014, 33(23): 68-73