Design And Research On Magneto-rheological Damper Support For Magnetic Bearing

This thesis aimed at the designing and testing of the squeezing-MR damper, includingelectromagnetic field simulation, rotor dynamics simulation, mechanical structure design, experimentalsystem assembling and commissioning，rotating experimental study，all of which can enrich the way ofactive vibration control of the magnetic bearing rotor.First, the magnetic field distribution of the magnetic bearings and squeezing-MR damper wasacquired on the base of the finite element analysis of electromagnetic. And the MRF damper andmagnetic bearings magnetic field coupling problem was solved and the biggest extrusion reaction forcewas calculated by the phenomenological model.With the hard and soft bearing of the ANSYS rotor dynamics module, the modal, harmonic andtransient analyses of the magnetic rotor system were completed. Through the simulation, the researchfound that the increasing of the damping of the basis supporting (squeezing-MR damper) can restrainthe vibration of rotor effectively, especially when the damping of magnetic bearing was small, theeffect was becoming more obvious.Base on the simulation, the mechanical structure design, assembling and commissioning of thesqueezing-MR damper experimental system were completed. Then the modal，harmonic and transientimbalance response experiment was completed within the system of the magnetic suspension rotorsystem which supported on the hard bearing and squeezing-MR damper. As the result of the largedamping of the magnetic bearing and the stiffness of the support sleeve, the results of the experimentwere not perfect. The mechanical structure of the squeezing-MR damper still needed to be improved.Based on Exploration module of ANSYS Workbench, the optimization design of thesqueezing-MR damper and magnetic bearing structure parameters were completed to improve thebearing capacity of magnetic bearing and performance the squeezing-MR damper. In the same way, theoptimization design of the position of bearing was realized. And the results showed that the appropriaterotor-support position can effectively reduce the vibration of rotor in the first bending speed andimprove the rotor vibration characteristics.