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提出一种具有金属橡胶弹性外环的气膜阻尼环(AFD)作为转子系统的辅助支承阻尼元件.建立AFD的力学模型,解释其工作机理.建立带AFD转子系统的试验台和测控系统,对比无AFD转子系统的动力特性,验证AFD的辅助支承阻尼性能.通过对AFD振动位移和相位的测量,说明气膜环在转子运转过程中的跟踪振动响应过程.通过对比气膜环和转子轴颈在转子系统运转过程中的相位差,验证AFD的工作机理和阻尼减振性能.最后研究初始气膜间隙对AFD性能的影响.研究结果表明:由于AFD具有可动金属橡胶环,气膜环能够跟随转子轴颈的振动量,自动调整偏心振动量和相位,具有自适应特性.在金属橡胶和气膜的刚度和阻尼作用下,AFD作为转子系统的辅助支承阻尼元件,为转子系统提供附加支承刚度和有效阻尼,起到限幅减振的作用.而初始气膜间隙越小,辅助支承阻尼作用的效果越明显.
A damping film with damping ring (AFD), which is a metal rubber elastic outer ring, is proposed as an auxiliary supporting damping element of the rotor system.The mechanical model of AFD is established to explain the working mechanism of the AFD rotor system.A test rig and measuring and control system with AFD rotor system are established. The dynamic characteristics of the AFD rotor system are verified to verify the auxiliary damping performance of the AFD.Through the measurement of the vibration displacement and the phase of the AFD, the tracking vibration response of the gas film ring during the rotor operation is illustrated.Through the comparison between the film ring and the rotor journal The phase difference of the rotor system during the operation of the system to verify the working mechanism of the AFD and damping damping performance.Finally, the impact of the initial film gap on the performance of AFD was studied.The results show that: due to AFD has a movable metal rubber ring, AFD is an auxiliary supporting damping element of the rotor system with the stiffness and damping of the metal rubber and the gas film, providing additional support stiffness for the rotor system, following the vibration of the rotor journal and automatically adjusting the amount of eccentricity and phase. And effective damping, play the role of amplitude damping.And the smaller the initial gas film gap, the effect of supporting the damping effect of the more obvious.