Researches On Wind Field Models And Extreme Loads Prediction Models Of HAWT CAD Software

The simulation of turbulence wind is the main research object of current wind turbine analysis and design technology, and also is one of the key technology problems to be solved in the national "863 Plan" project named "Full System Loads Analysis and Optimization of Wind Turbine Software" . This Paper develops a wind field model for the HAWT to contribute to the dynamic aerodynamic calculation for horizontal axis wind turbine. Based on this, the tool of Visual C++ is used to program wind field model and integrates the wind field module to the CAD software "Blade Design for windows" . This paper includes four parts: turbulence wind field model, gust model, extreme loads prediction model and the software development of the modules.The section of turbulence wind field discusses the relations among the discrete random series , the power spectrum and the fourier spectrum in the random theory, introduces several representative and commonly used velocity power density spectrums such as Harris spectrum, Karmal spectrunu von Karman spectrum etc. Based on the random theory , an arithmetic programmed using MATLAB has been developed to calculate the turbulence wind velocities . In addition, this section introduces three factors which influence the steady...