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针对燃气轮机支承座的设计目的,使得转子振幅尽量降低,以现有的转子系统动力学方程模型下,在三维坐标系中建立出支承刚度、阻尼和转子质点无量刚振幅的曲面关系。通过软件开发与计算,得到刚度-阻尼平面的一个区域内,多个不同的偏心率下最大振幅云图以及所产生振幅的转速云图。根据这些云图总结出转子系统在启动或停止时,偏心率的不同使可能造成事故的刚度、阻尼匹配点分布的变化规律,引入了极大振幅线的概念,并从中讨论了高速转子启动和停止时支承参数适合选择的位置。结果表明支承参数的选取在稳定情况下使转子处于最小振幅时反而是不安全的,应当在低偏心率变化下,极大振幅线快速划过的区域选取刚度-阻尼点。
According to the design purpose of the gas turbine bearing seat, the rotor amplitude is reduced as much as possible. Under the existing model of rotor system dynamics, the surface relationship of the bearing stiffness, damping and the amplitude of the immature moment of the rotor particle is established in the three-dimensional coordinate system. Through software development and calculation, the maximum amplitude of the cloud under a number of different eccentricities and the velocity profile of the generated amplitude are obtained in a region of the stiffness-damping plane. Based on these cloud images, the conclusion is drawn that the eccentricity of the rotor system during starting or stopping can make the stiffness of the accident and the variation rule of the damping matching point distribution, introduce the concept of extremely large amplitude line, and discuss the starting and stopping of high speed rotor When the support parameters suitable choice of location. The results show that it is not safe to choose the support parameters at the minimum amplitude of the rotor under steady conditions. The stiffness-damping point should be selected in the area where the maximum amplitude line rapidly traverses under the condition of low eccentricity.