Analysis Of Response Caused By Dynamic Load On Horizontal Axis Wind Turbine

The calculating method for the load response of the system is studied in this paper,according to the horizontal axis wind turbine structure and working feature, the outside environment and the international standard for wind turbine. Taking the 1.5MW variable speed pitch regulated wind turbine for example, the structural dynamics feature of the horizontal axis wind turbine system is studied, and an analysis model is upbuilt to analyze the whole machine dynamics for the wind turbine system, based on the research subject of"The overall design technology research and design software development for MW wind turbines"from Guangdong science plan project. The system consists of rotor,hub,nacelle,tower .The dynamic response caused by aerodynamic force and variable load is analyzed, and the overall model stabilization is considered.Firstly, with the accurate strip theory , considering the elements of the amount of the blades, hub losses, cascade effect ,tip losses ,etc. the aerodynamic load is calculated. The dynamic wake model and dynamic stall model is taken into consideration when using the model to calculate the aerodynamic performance, so that a calculating base is given for the design of the wind turbine structure.In the third chapter, the dynamic load on the blade and tower is calculated. The blade and tower model is set up respectively according to the modal analysis , the natural frequency and mode are calculated with matrix iteration method. All these results are coincident with the results obtained from Bladed for Windows. What's more, the dynamic response of the blade and tower are analyzed according to the linear acceleration method.The forth chapter is about the dynamic response calculation and the stabilization analysis for the coupled wind tube rotor/tower. With the help of the Modal synthesis,the structural dynamics analysis models for the wind turbine components and the whole machine are set up respectively. After figuring out the dynamic load on the rotor/tower with the aerodynamic model, the dynamic response of rotor/tower is calculated, an analysis on the stabilization of the rotor/tower is carried out, so that integrated analysis method of dynamic model of the whole wind turbine is initially formed. During the process of analyzing the whole machine mode, a dynamic analysis on the coupled tower-wind turbine-nacelle is performed. This kind of analysis is performed using the Modal synthesis. Besides, although the wind rotor/tower model is set up in this paper, the structural disposal on the sub-model is performed with the help of a domestic wind turbine model, Practical explore is needed to integrate the whole system. Despite of this, with the researches in this paper, the superiority of using the Modal synthesis when design the wind turbine is seen, and it is surly to be a good application.