滚装船-滑动车辆浮基多体系统的横摇研究

Rolling of Multibody System with Floating Base of Ro-Ro Ship and Slipping Vehicles

波浪和内部滑动车辆共同作用,使滚装船的横摇加剧。这是许多滚装船发生倾覆的重要原因之一。本文对由滚装船和滑动车辆组成的浮基多体系统中,取滚装船的横摇角和车辆在甲板上的横向位移为此系统的两个自由度。考虑非线性恢复力矩和非线性阻尼力矩的影响,运用浮基多体系统动力学方法,建立了系统的动力学方程。以某型海峡滚装渡轮为例,对在若干车辆同步滑动和波浪共同作用下的滚装船非线性横摇响应和车辆位移响应进行了数值计算,并与线性响应进行了比较,得出了考虑非线性时横摇角显著偏大的结论。

The simultaneous interferences of wave and slip of inside vehicles intensify rolling of ro-ro ship, which is one of the important reasons for ship overturn. The ro-ro ship and slipping vehicles are regarded as a multibody system with a floating base, where the rolling angle of the ship and the transverse displacement of the vehicles on desk are taken as two degrees of freedom. Considered the influence of the nonlinear restoration moment and damping moment, and adopted dynamic method of multibodies system with a floating base, the dynamic equations of the system are established. The numerical calculation for a channel ferry is carried out to find out the nonlinear rolling response of the ship and displacement response of the slipping vehicles under the simultaneous disturbances. It is concluded that the nonlinear rolling angle of the ro-ro ship increases remarkably as the nonlinear characteristics are taken into account.