滚装重荷载应急卸载过程的浮基多体系统动力学分析(英文)

Dynamic Analysis of Floating Base Multi-bodies System for Emergent Unloading Process of Roll-on Heavy Loads

在救灾和战争等非常情况下,利用中小型近海滚装渡轮或改装后的渔轮渡海输送重荷载,具有可征用船只数量多和装卸载不依赖吊装设备等优点。缺乏港口屏蔽的海浪环境中重荷载进行滚动卸载时,必须考虑波浪对船的作用和重荷载与船的相互作用。本文通过对船在波浪中所受表观重力和表观浮力的分析,导出波浪作用力矩的计算公式。运用浮基多体系统动力学方法,建立波浪—浮基—重荷载系统的动力学方程。使用标准的龙格—库塔四阶方法进行数值积分求解。考虑海况、船型和重荷载在船上运动参数等因素,计算了各工况下的横摇运动响应。进而给出了重荷载安全快速卸载的驾驶操作要求及相关运动规律。

On disaster relief and war condition,to make use of medium and small size roll-on ferry-ing ships and refitted fishing ships to transport heavy loads possesses advantages as these ships are numerous and no lifting facilities are needed.When unloading heavy roll-on loads in sea wave con-dition lack of harbor shielding,it is necessary to consider the effect of sea waves on the ships and mutual effects between the ships and the loads.Through analyses of ships subjected to the apparent buoyancy and the apparent gravitation in sea waves,the calculation formulas of sea wave effect mo-ments are derived,and the dynamic equations for wave-floating base-heavy load system by apply-ing the floating base multi-bodies dynamic method are established.The solution is by use of the fourth order Runge-kutta method.Considering the factors of sea condition,ship model,and parameters of heavy loads moving on ship,roll motion effects are calculated under different working conditions.And then driving operation requirements and relevant motion rules for fast and safe unloading of heavy loads are provided.