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首页> 外文会议>International Symposium on Stability Control of Rotating Machinery(ISCORMA-4); 20070827-31; Calgary(CA) >DYNAMIC BEHAVIOR OF GTU ROTOR-BEARINGS-CASING SYSTEM
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DYNAMIC BEHAVIOR OF GTU ROTOR-BEARINGS-CASING SYSTEM

机译：GTU转子-轴承-轴承系统的动态特性

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摘要

Dynamic behavior and response to possible seismic loading of GTU rotor-bearing casing system are investigated. Power turbine rotor is supported by two fluid film bearings with four and six tilting pads. Finite element (FE) model of rotor with nonlinear supports and rotor-bearings-casing system model are developed. The problems of eigenvalues and eigenmodes determination, rotor dynamics investigation with usage of Newmark direct integration method and spectral analysis of the structural response to seismic loading are solved at different steps of investigation. Rotor finite element model, comprising special finite elements, described in [3,4], that consider fluid film bearing nonlinear stiffness and damping are used in for dynamic behavior analysis at the step of the structural design. Tilting pad and multilobe bearing models are developed for determination of special finite element stiffness and damping matrices. These models assume coupled solution of incompressible lubrication flow problem in the clearance between shaft journal and pad surfaces and the problem of each pad stable position definition with working surfaces compliance taken into account. Rotor orbits in bearings and spectrum cascade plots, corresponding to them are obtained for turbine startup. Bearing malfunctions influence on rotor dynamic behavior is investigated. Finite element model of rotor-bearings casing system is developed for structural response analysis under the action of up to 9 balls earthquake. Evaluation of dynamic reactions in supports and attachment elements is carried out. It is shown, that the action of rotor gyroscopic moments may cause changes in natural frequencies of the structure and leads to considerable rotor and casing relative displacements, that have an influence on gasdynamic route gap values.
机译：研究了GTU转子-轴承箱系统的动态行为和对可能的地震载荷的响应。动力涡轮转子由两个带有四个和六个倾斜垫的液膜轴承支撑。建立了带有非线性支撑的转子有限元模型和转子-轴承-壳体系统模型。在研究的不同步骤中，解决了特征值和特征模态确定，使用Newmark直接积分法进行转子动力学研究以及结构对地震荷载响应的频谱分析等问题。转子有限元模型，包括在[3,4]中描述的特殊的有限元，考虑了具有非线性刚度和阻尼的流体膜，被用于结构设计步骤中的动态行为分析。开发了倾斜垫和多瓣轴承模型，用于确定特殊的有限元刚度和阻尼矩阵。这些模型假定在轴颈和轴瓦表面之间的间隙中存在不可压缩的润滑流动问题的耦合解决方案，并且考虑了每个轴瓦稳定位置定义以及工作表面柔顺性的问题。获得轴承和频谱级联图中的转子轨道（与之相对应）以进行涡轮启动。研究了轴承故障对转子动力学行为的影响。建立了转子轴承壳体系统的有限元模型，用于在高达9个球的地震作用下进行结构响应分析。评估载体和附着元件中的动态反应。结果表明，转子陀螺力矩的作用可能引起结构固有频率的变化，并导致相当大的转子和壳体相对位移，从而影响气动路径间隙值。

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