支撑刚度对水下航行器电机-推进轴系振动特性的影响规律分析及优化

A dynamic model of motor propulsion motor-shaft system in an unmanned underwater vehicle (UUV) is proposed to study the effects and optimization method of the dynamic responses of propulsion motor shaft system. The model considers the stiffness parameters of isolators, the internal electromechanical force of the motor rotor, the rolling bearing nonlinearity, the dynamic propeller excitation forces and the effects of flexible coupling. The effects of support stiffness parameters on the dynamic response characteristics of the propulsion motor shaft system were studied, the optimization process of propulsion motor isolator support stiffness were proposed, the optimization objective function of support stiffness was established based on the motor vibration responses, and then the optimal stiffness of the motor isolators were obtained. The results show that the isolator stiffness could reduce the low-frequency vibration caused by the unbalanced magnetic pull of the motor, and the vibration amplitudes is reduced by 25.6%~65.7%.