Complexed Active Magnetic Bearing Metal Rubber Ring Performance Parameters Optimization

Abstract

To reduce the vibration of flexible rotor supported on Active Magnetic Bearing (AMB), Metal Rubber Ring (MRR) is introduced and set around the AMB, hereafter called Complex Bearing (CB). Dynamic characteristics and Parameters Optimization of the system supported by CBs are studied in this thesis by theoretical analysis, Experimental Modal Analysis (EMA) and actual operation of the system. The main contents are as follows: 1) Presentation of the components and working principle of the CB-rotor system, highlighting the structure of the CB. 2) Analysis of demonstrative bearing-rotor system has been carried out to guarantee the whole modelling and analysis of the system is valid. The mathematic model of Free-Free rotor and CB are individually established in Patran and their natural frequencies calculated by MD-Nastran. 3) The mathematic model of CB-rotor system is also established and natural frequencies, modal damping, unbalance response and influence of CB performance parameters on dynamic characteristics of the system are investigated. 4) An optimization method is adopted and a case study with four design variables was conducted by using Nastran solution 200. 5) Dynamic characteristics of the CB-rotor system are investigated by EMA and actual operation of the system. The research results show that the first four modal damping ratios of the CB-rotor system are heavy and the system can get across the first two bending critical speeds safely