When a heavy load such as a vehicle slips freely on a ro-ro ship due to malfunction of its securing device, the heavy load slipping on deck will become more and more with the time going on because of repeated collision. Common effect of wave and slip of internal vehicles will induce serious rolling of the roll-on ship. This is one of the important reasons for overturn of the ro-ro ships.The multibody system with a floating base is composed of ro-ro ship and two slipping vehicles.This paper takes the rolling angle of the ship and the transverse displacements of the two slipping vehicles on deck as three degrees of freedom. Making use of dynamic method of multibody system, dynamic equations of the system are established.Taking a certain channel ferry as an example, numerical calculations were carried out for rolling response of the multibody system with a floating base of a ro-ro ship and displacements response of the two slipping vehicles under both effects of free slipping vehicles and wave,and a conclusion was drawn that the motion of the numerous free slipping heavy loads may lead to be synchronous under restraining of the side-wall bulkhead with the time going on because of repeated collision.%滚装船中车辆等重载荷由于固定装置失效而随船摇荡作自由滑动时,往往由于反复碰撞致使在甲板上作自由滑动的重载荷随着时间增多.由于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.本文对由滚装船和两辆滑动车辆组成的浮基多体系统,取滚装船的横摇角和两辆自由滑动车辆在甲板上的横向位移为此系统的三个自由度,运用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,对在两辆车自由滑动和波浪共同作用下的滚装船浮基多体系统的横摇响应和车辆位移响应进行了数值计算,得出了多个自由滑动的重载荷因相互碰撞在舷侧舱壁的约束下随着时间的延长其运动将趋于同步的结论.
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