Abstract
In rotating machinery, suppressing large-amplitude resonances in the vicinities of the major critical speeds has been a challenging problem. A finite element model of a Jeffcott rotor with a preloaded snubber ring subjected to unbalance excitation has been developed. An initial gap is reserved between the snubber ring mounted on the support and the rotating shaft, and the nonlinear stiffness characteristic is achieved by using laminated springs with preload. When passing through the critical speed, the rotor is supported by additional discontinuous stiffness once it contacts the preload snubber ring, completing the switch from one regime to another by reserved clearance. Therefore, the resonance amplitude is suppressed by system switching. In this paper, we focus on the effects of the snubber ring inertia and the reserved clearance on the vibration characteristics and damping performance of the hybrid dynamical system. Finally, it is verified by experiments that the designed backup support with a preloaded snubber ring can provide good vibration suppression for the primary resonance vibrations of the rotor system, and the maximum amplitude suppression rate can reach about 80%.
Published Version
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