关键词: 风力发电钢塔, 钢筋混凝土风力发电塔, 一体化有限元模型, 随机Fourier谱, 旋转Fourier谱, 动力放大效应, 拍振

Abstract:

Wind loads are considered to be one of the main harmful factors to threats the structural safety of wind turbine systems. Based on the typical pitch regulated 125 MW steel wind turbine system, an integrated finite element model consisting of the rotor, the nacelle, the tower and the foundation is established using the commercial software ANSYS. Then, on the basis of the random function description of stochastic processes, a physical model of the rotational Fourier spectrum is proposed according to the physical mechanism of wind speeds loading on rotating blades. Furthermore, the wind field of the target site is generated based on the random function method, and the wind-excited dynamic response analysis is thereafter done. In order to evaluate the dynamic amplification effect, the dynamic response results are compared with the static ones. The results show that the wind-induced dynamic amplification effect is remarkable, and this effect should be taken into consideration in the structural design phase. Moreover, obvious beat vibrations exist in the dynamic response analysis of steel wind turbine system, while similar phenomenon does not exist for the reinforced concrete wind turbine system.

Key words: steel wind turbine system, reinforced concrete wind turbine system, integrated finite element model, random Fourier spectrum, rotational Fourier spectrum, dynamic amplification effect, beat vibration