Wind and Structures

  • 제24권1호
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  • Pages.59-78
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  • 2017
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

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)
  • 투고 : 2016.03.01
  • 심사 : 2016.11.21
  • 발행 : 2017.01.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

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