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http://dx.doi.org/10.12989/was.2017.24.1.059

Non-stationary and non-Gaussian characteristics of wind speeds  

Hui, Yi (Wind Engineering Research Center, College of civil engineering, Hunan University)
Li, Bo (Beijing's Key Laboratory of Structural Wind Engineering and Urban Wind Environment, School of civil engineering, Beijing Jiaotong University)
Kawai, Hiromasa (School of Science and Engineering, Tokyo Denki University)
Yang, Qingshan (Beijing's Key Laboratory of Structural Wind Engineering and Urban Wind Environment, School of civil engineering, Beijing Jiaotong University)
Publication Information
Wind and Structures / v.24, no.1, 2017 , pp. 59-78 More about this Journal
Abstract
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.
Keywords
full scale measurement; synoptic wind storm; signal processing; time-frequency analysis;
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Times Cited By KSCI : 2  (Citation Analysis)
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