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Wind and Structures
  Volume 24, Number 1, January 2017 , pages 059-78

Non-stationary and non-Gaussian characteristics of wind speeds
Yi Hui, Bo Li, Hiromasa Kawai and Qingshan Yang

    Non-stationarity and non-Gaussian property are two of the most important characteristics of wind. These two features are studied in this study based on wind speed records measured at different heights from a 325 m high meteorological tower during the synoptic wind storms. By using the time-frequency analysis tools, it is found that after removing the low frequency trend of the longitudinal wind, the retained fluctuating wind speeds remain to be asymmetrically non-Gaussian distributed. Results show that such non-Gaussianity is due to the weak-stationarity of the detrended fluctuating wind speed. The low frequency components of the fluctuating wind speeds mainly contribute to the non-zero skewness, while distribution of the high frequency component is found to have high kurtosis values. By further studying the decomposed wind speed, the mechanisms of the non-Gaussian distribution are examined from the phase, turbulence energy point of view.
Key Words
    full scale measurement; synoptic wind storm; signal processing; time-frequency analysis
Yi Hui: Wind Engineering Research Center, College of civil engineering, Hunan University, Changsha, 410082 China
Bo Li and Qingshan Yang: Beijing\'s Key Laboratory of Structural Wind Engineering and Urban Wind Environment,
School of civil engineering, Beijing Jiaotong University, Beijing, 100044, China
Hiromasa Kawai: School of Science and Engineering, Tokyo Denki University, Ishizaka, Hatoyama, Hikigun, Saitama 350-0394, Japan

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