Control of Imbalanced Shafting Transverse Vibration with Parallel Misa-lignment under Nonlinear Force Excitation

Reasonable control of propulsion shafting vibration can effectively reduce the structural noise radiation of an undersea vehicle. In this study, a differential equation of shafting transverse vibration in uniform motion process is established considering the coupling of nonlinear force, parallel misalignment and eccentric mass of rotating shaft. The influence of parallel misalignment amount on the shafting nonlinear vibration characteristics is analyzed via simulation. And the process control standard of the parallel misalignment amount is proposed according to the numerical calculation results. It is shown that: the coupling effect of parallel misalignment, nonlinear force and eccentric mass leads to the nonlinear dynamic behaviors of the shafting, such as chaos and bifurcation; the existing control theory is not applicable to the control of shafting nonlinear vibration due to the complex nonlinear vibration characteristics, while establishing the process control standard of the shafting parameters can achieve the purpose of restraining the nonlinear vibration. This work may provide a new method for controlling the propulsion shafting vibration and noise radiation of an undersea vehicle.