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首页> 外文期刊>Thermal engineering >Forces exciting generation roll at rotor vibrations when rotor-to-stator rubbing
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Forces exciting generation roll at rotor vibrations when rotor-to-stator rubbing

机译：转子与定子之间的摩擦时，在转子振动时迫使产生激励的轧辊

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摘要

The consequences of emergencies of turbosets for different application are revealed, the cause of forced shutdown and even catastrophic destructions of which many researchers consider the rotor-to-stator rubbing and development—to a greater or lesser extent—of the phenomena of the rotor generation roll over the stator. The synchronous or asynchronous generation roll is determined by the rotor precession direction, coinciding or not coinciding with the self-rotation direction of the rotor. Asynchronous generation roll is the most dangerous form of the rotor-stator contact interaction with the vibrations with rubbing. The basic equations of rotor vibrations are presented: symmetric rotor fixed on two supports and that fixed on several supports after abrupt imbalance with and without rotor coming in contact with a flexible stator. The vibration process is considered as the rotor motion in a backlash with subsequent contact with the stator, loss of contact, or development of generation roll. The latter essentially depends on the properties of the “rotor-support-stator” dynamic system. The stator stiffness characteristic is specified in “force-deformation” coordinates that make it possible to take into account damping in the supports and power loss in the stator. The diagram of elastic-damping device was presented, which makes it possible to ensure a certain level of power loss at the stator displacements. The exciting forces promoting development of self-exciting vibrations of the rotor in the form of asynchronous generation roll were compared with the exciting forces of oil film of sliding bearings and forces of aerodynamic excitation in the turbine flow path and sealings. For the rotor systems of high and medium pressure of a 300 MW capacity turboset, the simulation results of the process of development of asynchronous generation roll at the vibrations with rubbing were revealed, and the basic characteristics of development of generation roll in a span between supports and time variation of casual coefficients of contact stiffness defining the forces exciting the generation roll at the contact interaction of the rotor with the stator were presented. The dependence of coefficients of contact stiffness on the rotor displacements submits to the hyperbolic law. The increase of damping decreases the probability of occurrence of dangerous consequences of emergencies, which are defined by many factors, including the rotor imbalance level.
机译：揭示了不同应用场合涡轮机组紧急情况的后果，强迫停机甚至灾难性破坏的原因，许多研究人员认为，转子生成定子现象或多或少在转子到定子的摩擦和发展中起着重要作用。滚过定子。同步或异步发电辊由转子进动方向确定，该进动方向与转子的自转方向一致或不一致。异步发电辊是转子-定子接触摩擦与振动的最危险形式。提出了转子振动的基本方程：对称转子固定在两个支架上，对称转子在突然不平衡之后固定在几个支架上，无论转子是否与柔性定子接触。振动过程被认为是转子在反冲中的运动，随后与定子接触，失去接触或产生轧辊。后者基本上取决于“转子－支承－定子”动态系统的属性。定子刚度特性在“力-变形”坐标中指定，可以考虑到支撑中的阻尼和定子中的功率损耗。给出了弹性阻尼装置的示意图，可以确保在定子位移时一定程度的功率损耗。将以异步发电辊的形式促进转子自激振动发展的激振力与滑动轴承油膜的激振力以及涡轮机流路和密封件中的空气动力激振力进行了比较。对于300 MW容量涡轮机组的高中压转子系统，揭示了在摩擦振动下异步发电辊发展过程的仿真结果，以及在支架之间跨度中发电辊发展的基本特征。给出了接触刚度系数的随时间的变化，这些系数定义了在转子与定子的接触相互作用时激发发电辊的力。接触刚度系数对转子位移的依赖性服从于双曲线定律。阻尼的增加降低了紧急情况危险后果发生的可能性，这种可能性由许多因素确定，包括转子不平衡水平。

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