MW级风电机组变桨系统动力学及结构仿真分析

发布时间：2018-05-16 12:04

本文选题：风力发电机组 + 变桨系统　；参考：《重庆大学》2014年硕士论文

【摘要】：变桨系统是水平轴风力发电机组的重要组成部分，主要功能是通过调节桨距角进行功率调节。为了研究风力发电机组变桨系统的工作性能和安全性能，论文运用多体动力学方法对风力发电机变桨时的动态特性进行了仿真分析，同时对变桨系统进行了结构有限元分析和疲劳分析。论文的研究方法为风力发电机组变桨系统的设计与校核提供了依据，具有一定的工程实用价值。论文的主要研究内容如下： ①研究了风力发电机组在变桨时的气动理论，阐述了MW级风力发电机组变桨系统基本结构与作用。 ②依据德国劳埃德船级社(GL)认证规范绘制风力发电机整机及变桨系统的拓扑图，根据拓扑图在SIMPACK中建立了变桨系统及整机动力学模型；建立自动变桨控制模型；依据IEC规定建立了变桨仿真时的风模型；建立了整机在变桨工况下的气-弹-控联合仿真模型，进行了时域分析。时域分析中分析了变桨过程中的桨距角变化、功率曲线变化和叶根处力和力矩的变化曲线。 ③依据风力发电机组变桨系统的受力特点，提出了用仅受压的三维杆单元link10模拟变桨轴承滚子的方法，建立了变桨系统的有限元模型并分析计算，得到了在单向载荷和变桨载荷下变桨机构的应力云图，以及变桨轴承的接触应力分布。 ④建立变桨轴承疲劳分析模型，应用有限元方法计算变桨轴承疲劳应力，运用雨流计数法处理得到疲劳载荷谱，进行材料的S-N曲线修正，，根据疲劳累积损伤理论，计算出变桨轴承在设计工作年限的疲劳损伤。
[Abstract]:The variable propeller system is an important part of the horizontal axis wind turbine, and its main function is to adjust the power by adjusting the pitch angle. In order to study the working performance and safety performance of wind turbine variable propeller system, the dynamic characteristics of wind turbine variable propeller system are simulated and analyzed by multi body dynamics method in this paper. At the same time, the finite element analysis and fatigue analysis of the variable propeller system are carried out. The research method of the paper provides the basis for the design and checking of the wind turbine variable propeller system, and has certain engineering practical value. The main contents of this thesis are as follows: The main contents are as follows: 1. The aerodynamic theory of wind turbine with variable propeller is studied, and the basic structure and function of variable propeller system of MW class wind turbine are expounded. (2) drawing the topology diagram of wind turbine and variable propeller system according to the German Lloyd's Classification Society (GLL) certification specification, establishing the dynamic model of the variable propeller system and the whole machine in SIMPACK, setting up the control model of the automatic variable propeller, and drawing the topology diagram of the wind turbine generator and the variable propeller system. According to the IEC rules, the wind model of the variable propeller simulation is established, and the air-elastic-control joint simulation model under the variable propeller condition is established, and the time-domain analysis is carried out. In the time domain analysis, the variation of pitch angle, power curve and the force and torque at the blade root are analyzed. According to the mechanical characteristics of variable propeller system of wind turbine, a method of simulating variable propeller bearing roller with link10, which is only subjected to compression, is put forward, and the finite element model of variable propeller system is established and analyzed and calculated. The stress cloud diagram of the propeller mechanism under unidirectional load and variable propeller load and the contact stress distribution of the variable propeller bearing are obtained. (4) the fatigue analysis model of variable propeller bearing is established, the fatigue stress of variable propeller bearing is calculated by finite element method, the fatigue load spectrum is obtained by using rain flow counting method, the S-N curve of material is corrected, and the fatigue cumulative damage theory is used. The fatigue damage of the variable propeller bearing in the design working life is calculated.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315

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