船舶推进轴系的动态模型

DYNAMIC MODEL OF MARINE SHAFTING SYSTEM

根据船舶轴系的结构特点与运动形式,先利用船体与轴承的有限元模型计算了轴系支承处的刚度,然后根据滑动轴承的运动方程,建立了滑动轴承油膜的有限元模型,分析了带有多个滑动轴承的船舶轴系的各轴承位置,并利用船舶系统的动刚度及油膜的动力特性以及螺旋桨的水动力,建立了轴系的动态计算模型,计算了在三个不同转速下轴系的动态响应。与实船测试的结果比较表明,轴系的动态模型是可信的,模型的建立为分析船舶在航行过程中的动态响应提供了方便。

The stiffness of shaft at bearing supporting places is calculated with finite element model of ship shell and bearings according to the characteristics of construction and movement of shafting system, the finite element models of oil films of sliding bearings are set up based on its motion equation and the equilibrium positions of multiple sliding bearings in the shafting system are analyzed. The dynamic model of the shafting system is then established on the basis of the determination of dynamic stiffness of shell, dynamic characteristics of oil films and hydrodynamic excitation of propeller. The dynamic response of shafting system are calculated at three different rotation speeds. It is verified through comparing test data with theoretical results that the dynamic model of the shafting system is credible. It is convenient to estimate the response of the shafting system under operation with this dynamic model.