舰载旋转机械基础冲击响应建模和数值计算

针对舰载旋转机械的水下非接触爆炸冲击动力学响应问题,提出了一种基础冲击转子-轴承系统建模理论.结合牛顿运动定理、动量矩定理和Timoshenko梁理论,推导出了系统动力学微分方程,方程综合考虑了转子的旋转惯性力、剪切力、陀螺效应、轴向力、轴向扭矩以及轴承的油膜力.通过在时间域和空间域分别采用直接积分法和Galerkin...

Shock response modeling and computation of shipboard rotating machinery subjected to base-transferred shock force

A rotor-bearing system under base-transferred shock excitation was established by applying the Galerkin finite element model to simulate the shipboard rotating machinery subjected to underwater non-contact explosion.Based on the Newton’s theorem,moment-of-momentum theorem and Timoshenko beam theory,the dynamic differential equations of this system were derived by synthetically considering the rotating inertia,shear force,gyroscopic effect,axial force,axial torque and oil film force.The dynamic differential equations were solved by using the finite difference methods in the time domain and the finite element method in the space domain,respectively.And the time-varying shock responses of this system were obtained.The accuracy of the proposed model was verified.Finally,an application example was given to analyze the influences of the gyroscopic effect and steady work loading on the shock responses of this system.Investigated results show that the accuracy of the proposed modeling and computation method can meet the engineering requirement and the gyroscopic effect has an obvious influence on the shock responses;and that the work loading can tone up the system response,but the overall response with the steady work loading being considered is distinct from the sum of the steady response and the shock response without the steady work loading being considered.