Rotordynamic Stability - A Simplified Approach.

LecturePg. 3-10Straightforward mechanics are used to give a physical understanding of the important parameters involved in rotor dynamic instability. A concise analysis procedure is proposed for assembling available information into a meaningful design stability analysis of between-bearing rotors. The technique combines the destabilizing effects on the rotor into an equivalent single source at the rotor mid-span, and uses an excitation "threshold value" to rate the system stability. Results of applying this design analysis technique to an unstable compressor and the benefit from bearing redesign are presented