Dynamics Analysis of Nonlinear Stiffness Rotor-Bearing System with Crack Fault

Abstract

The model of nonlinear stiffness rotor-bearing system with crack fault was set up, and the nonlinear dynamic characteristics of the system were analyzed by numerical method. In critical rotational speed range, there are frequency division motions when the crack depth is sallow and chaotic motion when the crack is deep. In supercritical rotational speed range, the main motions are periodical frequency divisions. The numbers increase along with the depth of crack. In ultra-supercritical rotational speed range, there are quasi-periodic motion decreasing when the crack depth is sallow and periodical-3 motion when the crack is deep. The conclusions provide a theoretic basis reference for the failure diagnosis to the nonlinear stiffness rotor-bearing systems with crack fault.

Bifurcation analysis of a flexible balanced cracked rotor–bearing system

“…A nonlinear model of a cracked rotor-bearing system is used by Luo and Zhang [9]. Harmonic frequency method is used to study the presence of the crack.…”