基于内薄层法的船冰碰撞载荷机理探究
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摘要
应用内薄层法的基础理论,定量解释了船冰碰撞载荷的作用机理,给出了在考虑非线性项的条件下,涵盖速度项的显性解析表达式.提出了一种新的冰力计算公式,定量地描述了碰撞结束后冰力下降的卸载过程,并且得到了压力在接触区域上的分布形式.利用内外动力学耦合原理,以Fortran语言编写程序,利用船舶碰撞的滞后性对恢复系数进行迭代计算,求解出冰力时历曲线的同时,得到相应工况下的经验系数.在多种工况下对系数进行讨论,给出了该公式的适用范围及经验系数的推荐取值.
The mechanism of ship-ice collision load was explained by applying basic theory of the inner thin layer. The influence of nonlinear term was taken into account,and the explicit expression formula containing relative velocity was derived.A new ice-force formula was proposed to depict the process of unloading quantitatively where the ice force decrease,and pressure distribution in contact area was obtained.Then,based on the method of coupling both inner and external dynamics,a Fortran program was compiled,and the recovery coefficient was calculated iteratively according to the the hysteresis of ship collision.Te ice-force time curve was solved,and the empirical coefficient was calculated.Finally,the coefficient was discussed under various conditions.The applicable range of the formula and the recommended value of the empirical coefficient was given.
The mechanism of ship-ice collision load was explained by applying basic theory of the inner thin layer. The influence of nonlinear term was taken into account,and the explicit expression formula containing relative velocity was derived.A new ice-force formula was proposed to depict the process of unloading quantitatively where the ice force decrease,and pressure distribution in contact area was obtained.Then,based on the method of coupling both inner and external dynamics,a Fortran program was compiled,and the recovery coefficient was calculated iteratively according to the the hysteresis of ship collision.Te ice-force time curve was solved,and the empirical coefficient was calculated.Finally,the coefficient was discussed under various conditions.The applicable range of the formula and the recommended value of the empirical coefficient was given.
引文
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[2]YAKIMOV V V,TRYASKIN V N.Use of the stochastic simulation technique for estimation of the ice cover strength by interaction with ship hull[C]//Proc of Recent Development of Offshore Engineering in Cold RegionsInternational Conference on Port&Ocean Engineering Under Arctic Conditions.[s.n.],2013:1-9.
[3]LE T T,LIM Y I,PARK C K,et al.Effect of ship motion on separation efficiency in crude oil separator with coalescer[M].Amsteradm:Elsevier Inc,2018.
[4]DALEY C G.Energy based ice collision forces[C]//Proceedings of the 15th International Conference on Port and Ocean Engineering under Arctic Conditions(POAC).[s.n.],1999:674-686.
[5]DALEY C G.Reanalysis of ice pressure-area relationships[J].Marine Technology,2007,44(4):234-244.
[6]张宁.FORTRAN语言在船舶计算中的应用[J].船舶,2000(5):58-61.
[7]段海娟,孔祥安.Fortran 90与面向对象程序设计[J].微型电脑应用,2000,16(8):50-52.
[8]Pedersen P T,Zhang S.On impact mechanics in ship collisions[J].Marine Structures,1998,11(10):429-449.
[9]王自力,顾永宁.船舶碰撞运动的滞后特性[J].中国造船,2001,42(2):56-62.
[10]WANG Z L,GU Y N,HU Z Q.Motion lag of struck ship in collision[J].Journal of Ship Mechanics,2001,5(6):40-49.