Whirl and whip—Rotor/bearing stability problems

摘要: A mathematical model of an unloaded symmetric rotor supported by one rigid and fluid lubricated bearing is proposed. The represented generalized (modal) parameters its first bending mode. rotational character the force taken into account. yields synchronous vibrations due to unbalance as a particular solution equations motion, rotor/bearing system natural frequencies corresponding self-excited known “oil whirl” whip”. stability analysis rotative speed threshold stability. also gives evaluation vibrations. In balance resonance region two more thresholds are encountered. width this directly related amount unbalance. results based on stand with very good agreement field observations dynamic behavior experimental data.