Dynamic Behaviors of Rotor Nonlinear System Supported in Axial-Groove Gas Bearings

doi:10.3901/JME.2022.07.103

Abstract

Abstract: The unbalance responses and bifurcation of dynamic behaviors of rotor nonlinear dynamic system supported in axial-groove gas bearings are investigated. A dynamic model of axial-groove gas bearing-rotor nonlinear system is proposed by coupling the rational function model of gas bearing with the motion model of the rotor. The rational function model of gas bearing is established by using the vector fitting approximate method. The proposed model avoids the repeated calculations of dynamic gas film forces and saves the computing cost. The unbalance responses and bifurcation of the rotor system supported in axial-groove gas bearings are investigated by the trajectory, frequency spectrum, Poincaré map and bifurcation diagram of the journal and rotor disk centers. The route from period-doubling root to chaos of the nonlinear system is investigated by rotor speed taken as bifurcation parameter. The inverted bifurcation behavior of period-doubling motion of the nonlinear system is investigated by using mass eccentricity as bifurcation parameter. The numerical results show that the complex dynamic phenomenon and bifurcation behavior exist in the rotor nonlinear system supported in axial-groove gas bearings.

Key words: rotor system supported in gas bearings, nonlinear, vector fitting approximation, rational function

CLC Number:

TH133

LI Sha, LÜ Yanjun, LUO Hongbo, ZHANG Yongfang, SHI Rui. Dynamic Behaviors of Rotor Nonlinear System Supported in Axial-Groove Gas Bearings[J]. Journal of Mechanical Engineering, 2022, 58(7): 103-116.

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