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The Influence of Friction in Rotor-Stator Contact Nonlinear Dynamics

2018; Springer Nature (Netherlands); Linguagem: Inglês

10.1007/978-3-319-99268-6_30

2211-0992

Rodrigo Veronese Moreira, Alberto Paiva,

Adhesion, Friction, and Surface Interactions

This work deals with the nonlinear analysis of a nonsmooth rotordynamic system subjected to friction during contact between rotor and stator. The system consists of a Jeffcott rotor surrounded by a stator, both modeled as linear oscillators with two degrees of freedom each. Impact between rotor and stator is modeled as an elastic interaction, subjected to Coulomb friction. Numerical simulations are carried out using the fourth-order Runge-Kutta method to integrate the differential equations of motion. The contact possibility ensures a nonlinear behavior, which motivates investigations concerning parameters variation, such as: rotating speed, contact stiffness and friction coefficient. Initially, a qualitative space parameter analysis involving these quantities is performed, in order to identify the contact nature (no contact, intermittent contact and permanent contact). Then, bifurcation diagrams are used to characterize the system response dynamical complexity, as a function of the friction coefficient. For some specific parameters sets of special interest, trajectories in state subspaces and Poincare sections reveal a vast dynamical behavior richness, mainly associated to intermittent contact conditions, including the possibility of chaos.