Abstract—

The article presents an algorithm for and results from studying the motion of a rotor involving its simultaneous rubbing against the stator elements in the turbine set span and supports. The aim of the study was to develop the mathematical model describing vibration of the rotor resting in a few supports and to select the main assumptions regarding the contact interaction between the rotor and stator that will make it possible to model a real vibrational process that involves rubbing. An abrupt loss of balancing in the rotor’s second span section at the angular rotation speed is taken as the initial disturbance upsetting the turbine set’s normal operation. The case of a constant rotor rotation speed with loss of balancing followed by development of contact interaction between the rotor and stator elements is considered. This scenario seems to be the most plausible because the interaction persists for a short period of time during which the safety system still remains silent in producing the command to disconnect the steam supply to the turbine, and the torque on its shaft remains constant. It is shown that with the adopted clearances in the turbine set span and supports, with the loss of balancing corresponding to detachment of the mass of one turbine blade, and with increased damping in the supports, the rotor motion is accompanied by rubbing in the turbine set supports and span. If the damping coefficient in the supports does not exceed the value of this parameter in the plain bearing oil film, asynchronous reverse whirl of the rotor develops, which is characterized by self-excited vibration caused by the effect of contact interaction forces between the rotor and stator. Owing to consideration of the rotor design features, its frequency characteristics, including the change in the frequency characteristics of the rotor–supports system due to additional reactions arising at the moments in which the rotor comes into contact with the stator, it becomes possible to model the vibration development process not only during strong (when whirl is excited) but also during weak (possible excitation of low-frequency vibration) interactions between the rotor and stator and to analyze the influence of detuning from resonances and other factors on the development of self-excitation processes in systems closer to real ones.

中文翻译：

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涡轮发电机转子的振动以及跨度和支撑

摘要—

本文提出了一种算法，用于研究转子的运动并涉及转子的运动，该运动涉及同时摩擦涡轮机组跨度和支架中的定子元件。这项研究的目的是建立描述转子在几个支座上的振动的数学模型，并选择关于转子和定子之间的接触相互作用的主要假设，这将使模拟涉及摩擦的真实振动过程成为可能。 。转子第二跨度部分在角转速下突然失去平衡被视为扰乱涡轮机组正常运行的初始干扰。考虑具有恒定的转子转速而失去平衡，然后在转子和定子元件之间形成接触相互作用的情况。这种情况似乎是最合理的，因为这种相互作用持续了很短的时间，在此期间安全系统仍然保持沉默，无法发出断开向涡轮机供应蒸汽的命令，并且其轴上的扭矩保持恒定。结果表明，在涡轮机组跨度和支架之间采用间隙的情况下，由于失去了一个涡轮叶片的质量而失去了平衡，并且在支架中增加了阻尼，转子运动伴随着涡轮的摩擦设置支撑和跨度。如果轴承座中的阻尼系数不超过滑动轴承油膜中该参数的值，则会产生转子的异步反向旋转，它的特点是由转子和定子之间的接触相互作用力引起的自激振动。由于考虑了转子的设计特征，其频率特性，包括由于转子与定子接触的瞬间产生的附加反应而导致的转子-支撑系统的频率特性变化，因此可以进行建模不仅在强烈的（激振时）而且在弱的（可能激发低频振动）相互作用时，转子和定子之间的振动发展过程，并分析共振失谐对其他因素的影响。系统中的激励过程更接近真实的过程。