风力发电机高塔系统动力特性及动力响应研究

发布时间：2018-03-26 06:04

本文选题：风力发电机　切入点：自振特性　出处：《南京航空航天大学》2013年硕士论文

【摘要】：风力发电机是典型的高耸塔体结构。在设计中应根据自振特性分析选取合理的结构形式、结构材料等以尽量降低结构在工作环境下的共振效应，保证高塔系统整体稳定性。在风机工作环境中风荷载为控制荷载，，因此研究风力发电机塔架在风荷载作用下的风振响应和提取风振系数对实际工程具有重要意义。另外，考虑土-结相互作用对于结构在地震作用下的动力响应有着一定影响，因此在风力发电机结构设计中应充分考虑地基与结构之间的相互作用。本文对风力发电机高塔系统进行了叶片-机舱-塔架-基础-地基一体化建模，并进行了以下工作： (1)对某1.2WM典型风力发电机进行了模态分析，研究了其各阶自振频率和振型。并通过改变各尺寸变量，讨论了其对风力发电机自振频率影响。最后根据数值实验结果拟合出风力发电机几种尺寸变量对风机基频及倾覆频率的影响函数。 (2)通过输入不同风速谱，基于随机振动理论分析了风力发电机的风致振动响应及风振系数。并讨论了风速谱对风致响应的影响，以及风速谱和峰值因子对风振系数的影响。 (3)由土弹簧模拟地基土的影响，对风力发电机塔架-基础-地基系统进行地震反应分析，并与刚性地基情形的动力响应结果进行了对比，分析了土结相互作用对风力机塔架的地震响应影响。 (4)对本文工作进行总结，并给出风力发电机系统进一步动力分析的研究建议。
[Abstract]:Wind turbine is a typical towering tower structure. In order to reduce the resonance effect of the structure in working environment, the reasonable structure form and structural material should be selected according to the natural vibration characteristics in the design. In order to ensure the overall stability of tower system, the wind vibration response of wind turbine tower under wind load and the extraction of wind vibration coefficient are of great significance to practical engineering, since the wind stroke load is the control load in the wind turbine working environment, so the wind vibration response of wind turbine tower under wind load is studied and the wind-induced vibration coefficient is extracted. Considering the influence of soil-junction interaction on the dynamic response of structures under earthquake, Therefore, the interaction between foundation and structure should be fully taken into account in the structural design of wind turbine. In this paper, the integrated modeling of blade, engine room, tower, foundation and foundation of wind turbine tower system is carried out, and the following work is done:. In this paper, the modal analysis of a typical 1.2WM wind turbine is carried out, and the natural frequencies and modes of each order are studied. Finally, according to the results of numerical experiments, the influence functions of several dimensional variables of wind turbine on the basic frequency and overturn frequency of wind turbine are fitted. Based on the random vibration theory, the wind-induced vibration response and wind-induced vibration coefficient of wind turbine are analyzed, and the influence of wind speed spectrum on wind-induced response and the influence of wind velocity spectrum and peak factor on wind-induced vibration coefficient are discussed. 3) the seismic response analysis of wind turbine tower foundation foundation system is carried out by simulating the influence of soil spring on foundation soil, and the results are compared with the dynamic response results of rigid foundation. The influence of soil-junction interaction on the seismic response of wind turbine tower is analyzed. 4) summarize the work of this paper and give some suggestions for further dynamic analysis of wind turbine system.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU347;TU311.3

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