Subharmonic Resonance Stability Prediction for Turbomachinery with Active Magnetic Bearings

A finite element computer program for evaluation of dynamic stability of turbomachinery supported by active magnetic bearings has been developed. The new program includes the capability to study the effect of sensor noncollocation and frequency dependent bearing characteristics on the predicted stability of high performance turbomachinery. This paper presents a summary of the verification of the PC-based computer program. The final case study presents the predicted stability variation considering the influence of sensor noncollocation for an eight stage compressor supported by active magnetic bearings.