限制水域船舶纵向下水的动力学分析

为了对限制水域内船舶纵向下水运动进行完整而准确的预报,考虑兴波阻力、粘性阻力、锚链力、钢缆力、水流力、横向侧推力的动力效应以及不对称水域等因素对下水运动的影响,针对下水各阶段建立了船体运动模型,提出了一种较为完善的限制水域内下水运动理论计算方法.采用该方法对一艘45000吨化学品/成品油轮的下水运动进行了预报,并与实船下水测试结果进行了比较分析.结果表明,此方法可以较好地模拟船舶下水运动,为分析和判断船舶下水的安全性提供了依据.

Dynamic analysis of Longitudinal Ship Launching in Restricted Water

In order to give a better prediction for the motion of launching ship in restricted water, the effects of dynamic forces such as wave resistance, viscous resistance, chain force, wirerope force, current force, side thrust and unsymmetrical water area on ship launching were considered. The motion models of ship were founded in every stage of launching. A rather perfect theoretical method to calculate the ship motion throughout its longitudinal gravitational launching in restricted water was presented. This method was used to calculate the motion of a 45000DWT chemistry/product oil tanker during launching. It indicated that this method can simulate the motion of ship launching very well by comparing the results of the theoretical calculation with that of the practical ship launching experiments. It will provide evidence for analyzing and judging the safety of ship launching.