Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Wind and Structures Volume 24, Number 1, January 2017 , pages 059-78 DOI: https://doi.org/10.12989/was.2017.24.1.059 |
|
|
|
Non-stationary and non-Gaussian characteristics of wind speeds |
||
Yi Hui, Bo Li, Hiromasa Kawai and Qingshan Yang
|
||
| 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. | ||
| Key Words | ||
| full scale measurement; synoptic wind storm; signal processing; time-frequency analysis | ||
| Address | ||
| 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 | ||