국내 최대 기계 및 로봇 연구정보

공학설계D/B

공학설계D/B 게시판 내용
Volume Title	Wind Engineering
Volume No	Wind speeds and turbulence - mean hourly and gust speeds, extreme speeds, turbulence characteristics.
DATA Title	Strong winds in the atmospheric boundary layer. Part 2: discrete gust speeds.
DATA Item	83045
KEYWORD	atmosphere, gust, roughness, speed, terrain, turbulence, wind
ISBN	0 85679 460 0
ABSTRACT	ESDU 83045 gives a method for estimating the variation of the expected maximum gust speed with height above the ground for any gust averaging time greater than about 1 second. The method takes into account the roughness of the site terrain and also any roughness changes that occur upwind. The roughness of the terrain affects the mean-hourly wind speed and its turbulence component. Theoretical methods were used to account for these effects and the results combined into a simplified method that is presented in the form of convenient calculation sheets and equations for the data. A gust factor approach is used to relate the maximum gust speed to the corresponding mean-hourly wind speed given by ESDU 82026. The gust factor dependence on averaging time is derived using the spectral density of the fluctuating component of wind speed. The approach gives an extreme-value distribution that provides an estimate of the maximum value of the fluctuating component and hence the gust speed for any averaging time and time interval within which the wind speed is observed. Gust factors derived using this approach are presented graphically and in simplified equation form. A practical worked example illustrates the use of the data The methods on which these simplified procedures are based are programmed in ESDUpac A9232, see ESDU 92032.