Research On Dyhamic Characteristics Of Rotor Systems Supported On Rolling Bearing And Metal Rubber Ring

The vibration problems of rotating machinery cause complications for a long time. Metal rubber as a new functional material, which was used in the film damper and magnetic bearing-rotor system and the effects of reducing vibration were well. But for some rotating machinery working in the specific circumstances such as aerospace and high or low temperature, oil lubrication will not work and the complex oil lubrication system or magnetic levitation control system caused many difficulties in the operation and maintenance of machine.In this paper, the metal rubber ring is installed tightly between the rolling bearing outer ring and bearing block to constitute the metal rubber-rolling combination support. Firstly, the stiffness and damping mathematic model of this combined support was build and analyzed. The analysis results show that, with increase of porosity and thickness and decrease of width of the metal rubber ring, the stiffness and damping ratio of this combined support were smaller, and the effect of porosity is greater, while width and thickness is smaller.Secondly, based upon ANSYS, modal analysis, calculation of critical speed and unbalance response analysis of the rotors supported on this combined support and pure rolling bearing were completed. On one hand, the combined support make critical speed of rotor lower so that rotor can work at the speed further away from critical speed and it is more safety. On the other hand the combined support make bending deformation of shaft smaller and steady-state unbalance response at disc smaller so that avoid the rotor parts would be not broken due to excessive deformation.Also, the steady-state response mathematic model of the rigid rotor supported on the combine support was build. And Effects of metal rubber ring parameters on stiffness and damping of this combined support, critical speed of rotor, and steady-state response of rigid rotor were analyzed. The analysis results show that, the combined support make outward force transmitted by steady-state rotor significantly smaller thus reducing damage to bearing block. And with increase of porosity and thickness and decrease of width of the metal rubber ring, the stiffness and damping ratio of the combined support is smaller, critical speed of rotor is lower, critical speed region became narrower, and the rumored force is more tiny. So that rotor system can go across critical speed region faster and work steadily.In summary, the support combining metal rubber and rolling bearing can effectively reduce vibration of rotor system. And with increase of porosity and thickness and decrease of width of the metal rubber ring, the effect of reducing vibration is more obvious.In addition, the rotor experimental stand was designed. It laid the foundation for the experimental study.