百万千瓦电站汽动引风机组动态特性分析

发布时间：2018-05-11 00:24

本文选题：弯扭耦合 + 齿轮啮合　；参考：《东北大学》2014年硕士论文

【摘要】：百万千瓦电站汽动引风机组是电站的大型关键设备,其重要特征是原本相互独立的多个转子-轴承系统通过齿轮啮合而相互作用。目前国内外研究学者对齿轮耦合的多转子系统研究还相对较少。故本课题以两级齿轮减速传动的百万千瓦电站汽动引风机组的轴系为研究对象,进行齿轮耦合轴系的建模与振动分析,形成了一套适合于工程应用的含齿轮耦合轴系弯振、扭振和弯扭耦合振动的计算方法体系。主要研究内容有：(1)机组轴系的线性及非线性动力学模型建立根据轴系的实际数据,综合考虑各部件的结构特点、集中质量和集中转动惯量分布、材料特性及齿轮参数、轴承参数、联轴器型式等,建立汽动引风机轴系的动力学模型,其中包括近似计算的线性动力学模型和考虑非线性因素情况下的非线性动力学模型。(2)机组轴系的振动特性分析在考虑了陀螺力矩的基础上,主要分析了轴系中汽轮机、引风机、大齿轮-联轴器-引风机串联子系统以及整个轴系系统的各阶弯曲振动、扭转振动、弯扭耦合振动的临界转速和振型,并研究了汽轮机支撑轴承的交叉刚度和阻尼、齿轮箱支撑刚度和齿轮啮合刚度等参数变化对固有特性的影响。(3)机组轴系的不平衡响应分析综合考虑了由于齿轮和联轴器的耦合效应及非线性特性会使系统出现新的动力学特性,如由弯振引起的扭振、弯扭耦合振动等,在实际支撑条件下,确定了不平衡量及不平衡位置并对轴系存在不平衡量的情况下的不平衡响应进行分析,得到汽轮机、齿轮箱、联轴器、引风机以及综合考虑所有不平衡量时轴系系统中各关键节点的动态响应图,并分析了结构阻尼大小对系统不平衡响应的影响。(4)机组轴系在不平衡激励下的非线性响应分析综合考虑陀螺力矩、齿轮和联轴器的耦合效应、齿轮啮合刚度时变性等建立非线性动力学方程,采用固定界面模态综合法进行自由度降维,用无条件收敛的Newmark-β法求解汽轮机和引风机端各关键节点处的响应,近而分析了各关键节点的时域波形、轴心轨迹及幅频响应曲线,并分析比较了齿侧间隙和啮合刚度对各关键点的非线性影响。
[Abstract]:Millions of kilowatt power station steam induced fan set is a large key equipment of the power station, its important characteristic is that many rotor-bearing systems that are independent of each other interact with each other through gear meshing. At present, there are few researches on gear coupling multi-rotor system at home and abroad. Therefore, taking the shafting system of the steam induced fan set of the millions of kilowatts power station of the two-stage gear deceleration drive as the research object, the modeling and vibration analysis of the gear coupling shaft system are carried out, and a set of bending vibration of the coupling shafting system with gears suitable for engineering application is formed. The calculation method system of torsional vibration and bending-torsional coupling vibration. The main research contents are as follows: (1) the linear and nonlinear dynamic models of shafting are established. According to the actual data of shafting, the structural characteristics of each component, the distribution of concentrated mass and moment of inertia, the material characteristics and gear parameters are considered synthetically. Bearing parameters, types of couplings, etc., to establish a dynamic model of the shaft system of a steam induced fan, Including the approximate linear dynamic model and the nonlinear dynamic model under the consideration of nonlinear factors, the vibration characteristics of shafting are analyzed. On the basis of gyroscopic moment, steam turbine and induced fan in shafting are mainly analyzed. The critical speed and mode of the bending vibration, torsional vibration, bending and torsional coupling vibration of the series subsystem and the whole shafting system are studied. The cross-stiffness and damping of the bearing of steam turbine support are also studied. The influence of gear box support stiffness and gear meshing stiffness on the inherent characteristics. The analysis of the unbalanced response of the shafting system of the gear box considering the coupling effect of gear and coupling and the nonlinear characteristics of the system synthetically consider that the system will appear in the system. New dynamics, For example, torsional vibration caused by bending vibration, coupled bending-torsional vibration and so on, under actual supporting conditions, the unbalance quantity and unbalance position are determined and the unbalance response in the case of shaft system unbalance is analyzed, and the steam turbine and gearbox are obtained. The dynamic response diagram of the key nodes in the shafting system when the coupling, the induced fan and all the unbalance quantities are taken into account, The influence of structure damping on system unbalance response is analyzed. The nonlinear response of shafting system under unbalanced excitation is analyzed. The coupling effect of gyro moment, gear and coupling is considered synthetically. The nonlinear dynamic equations of gear meshing stiffness are established, the degree of freedom is reduced by the method of fixed interface modal synthesis, and the response of the key nodes of steam turbine and induced fan is solved by the Newmark- 尾 method of unconditional convergence. The time domain waveforms axis locus and amplitude-frequency response curves of each key node are analyzed and the nonlinear effects of tooth side clearance and meshing stiffness on each key point are analyzed and compared.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM62

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