波箔气体轴承支承的转子非线性振动的研究

Research on Nonlinear Vibration of Rotor Supported by Bump Foil Bearings

为提高波箔气体轴承支承的微型透平机械转子在高速运转时的稳定性,需要对由波箔轴承气膜力和箔片摩擦力引起的非线性振动进行研究。建立在轴承气膜力和箔片摩擦力共同作用下的转子局部受力模型,运用4阶变步长Runge-Kutta法计算转子在不同转速下的振动响应,观察转子升速过程中的混沌运动成分,分析转速对转子非线性动力学性能的影响。结果表明,转速变化会引起响应形态的变化,非线性振动作用在临界转速区不明显,远离临界转速区时较明显。

To improve the stability of high speed rotors supported by bump foil bearings,this paper researches on nonlinear vibration caused by the bearing＇s air film force and friction,establishes the model of the partial rotor by the action of the air film force and the frictional force of the chaff and calculates the rotor＇s response under different speeds,using 4 order Runge-Kutta Method. The result shows that response change depends on the rotational speed,the nonlinear vibration is less in critical speed zone while more away from the zone.