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This study performs a systematic dynamic analysis of a gear-bearing system with time varying stiffness, gear backlash and surface friction. At first the period expansion method is proposed to build a six-degree-of freedom nonlinear dynamic model of a spur gear pair. Then the dynamic orbits of the system are observed using the bifurcation diagrams with the mesh stiffness and the rotational speed ratio...
A nonlinear dynamic model is established to analyze the complicated dynamic behaviors of a rotor-bearing system with coupled faults in this paper, where the time-varying crack stiffness, rub-impact force and nonlinear oil-film force are taken into consideration. The numerical simulation focuses on the effects of crack depth on the onset of instability and nonlinear vibration responses of the rotor-bearing...
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