Processing of Experimental Signals to Assess the Dynamic Behavior of a Model Rotor System with Passive and Active Magnetic Bearings

The paper considers a complete magnetic suspension of a small-sized horizontal rotor in passive radial and active axial magnetic bearings. It describes experimental studies of the dynamics of a model rotor in a combined passive-active magnetic suspension. The studies were performed using the developed specialized software and hardware complex for measuring and analyzing the dynamic characteristics of rotors with magnetic suspension systems. Its software includes special algorithms of the mathematical data processing for measuring and evaluating the main parameters of the signals characterizing the vibration displacement of the rotor points. The results are presented in the form of vibrograms of rotor support section motion in the radial direction, spectrograms of these signals and amplitude-frequency characteristics. The work shows how the proposed experimental analysis of the vibration state of a rotor system with magnetic bearings allows modifying the rotor design to reduce the vibration amplitudes at rotation speed values close to the critical ones.