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为了获得水平轴风力机在时变载荷作用下的动态响应,提出一种基于模态叠加法的复杂工况下风力机整机动态响应分析计算流程。在动响应计算中,采用叶素动量定理计算风力机叶片在各个运行工况下的时变载荷,并建立风力机整机结构有限元模型;以叶片动载荷为激励,运用模态叠加法对风力机的动态响应进行分析。搭建实验室规模的风力机动响应测试平台,通过测试结果与数值分析结果的对比分析,表明该文分析流程的正确性。以陆地2 MW大型风力机为研究对象,运用该文所提出的计算方法对风力机系统的动态响应进行分析,得到不同风况下轮毂的位移动响应时域历程,对激励中各频率成分对结构动响应的影响进行分析。结果表明,在湍流风的作用下风力机的横向位移会产生大幅波动;在强阵风作用下风力机轮毂振动加剧,振幅最大增加179.52%,在风力机结构设计时应给予一定重视。
In order to obtain the dynamic response of a horizontal axis wind turbine under time-varying loads, a dynamic analysis and calculation procedure of wind turbine based on modal superposition method is proposed. In dynamic response calculation, the time-dependent load of wind turbine blades under various operating conditions was calculated using the law of the element of vorticity, and the finite element model of wind turbine machine structure was established. With the dynamic load of the blade as the motivation, Wind turbine dynamic response analysis. Set up laboratory-scale wind power response test platform, through the test results and numerical analysis of the results of the comparative analysis shows that the analysis of the correctness of the paper. Taking the 2 MW large-scale onshore wind turbine as the research object, the dynamic response of the wind turbine system is analyzed by using the calculation method proposed in this paper. The time history of the displacement response of the hub under different wind conditions is obtained. Structural dynamic response should be analyzed. The results show that the lateral displacement of the wind turbine fluctuates sharply under the effect of turbulent wind. Under the action of strong gust, the vibration of the wind turbine hub aggravates and the maximum amplitude increases by 179.52%. Attention should be paid to the structure design of the wind turbine.