EFFECT OF VARIOUS ROTOR-BEARING SYSTEM PARAMETERS ON THE WHIRL STABILITY OF SYSTEM ROTATIONAL MODES OF MOTION

摘要

In this investigation, the linear stability of the rotational modes of whirling motion of a rigid appendage-shaft system mounted in flexible damped supports is presented. A set of sufficient conditions for the asymptotic stability of the rotational modes of motion is formulated in terms of various system nondimensionalized parameters. A comprehensive investigation of the influence of different system parameters on the whirl stability of the rotational motion has been performed through a variety of graphical representations of system stability boundaries in terms of system parameters. Among the results reached in this paper is the demonstration of the role played by (a) appendage mass and dimensions, (b) bearing stiffness isotropy, (c) bearing cross-coupling stiffnesses and (d) bearing-cross coupling damping coefficients as possible sources of whirl instability of system rotational motion.