Analysis And Modeling Of Non-Gaussian Fluctuating Wind Speed Of Typhoon Based On Field Measurements

Every year many important engineering structures are destroyed by typhoon, typhoon cause huge economic damage and casualties, this cause extensive concern of civil engineers. Especially for various high, light and flexible structures, typhoon load is a decisive role. In the study of wind characteristics, people usually assume wind load process for stationary Gaussian random process. In the open field, this assumption for steady and normal wind is suitable, but for typhoon this does not apply. So for the typhoon Non-Gaussian studies and modeling are particularly important.Firstly, in this paper, the characteristics of field measurement of typhoon are compared and studied, using high order statistic analysis, K-S inspection and bicoherence spectrum analysis fluctuating wind speed of typhoon and fluctuating wind speed of normal wind is compared and analyzed, using rounds inspection and Hilbert-Huang Transform fluctuating wind speed of typhoon and fluctuating wind speed of normal wind is compared and analyzed. Through the above analysis, it is known that the fluctuating wind speed of typhoon is non-stationary and Non-Gaussian, but the fluctuating wind speed of normal wind is stationary and Gaussian. Then the parameters of wind turbulence properties and wind spectrum of typhoon are compared with normal wind.Finally because field measurement of typhoon is Non-Gaussian, the stationary and Non-Gaussian fluctuating wind speed is modeled. In the application of linear filter AR method the stationary and Gaussian fluctuating wind speed of both single point and multipoint is modeled, then the stationary and Non-Gaussian fluctuating wind speed is modeled by the Correlation Distortion method. Skewness, kurtosis, the spectrum characteristics and the correlation are used in confirmation of the simulation wind speed. Results show that the Correlation Distortion method is accurate.