滚装船和滑动载荷组成的浮基系统的非线性横摇

波浪和内部重载荷滑动共同作用,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。对由滚装船和滑动重载荷组成的浮基系统,取滚装船的横摇角和重载荷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,运用多体系统动力学方法,建立了浮基系统的动力学方程。以某型海峡滚装渡轮为例,对在若干重载荷同步滑动和波浪共同作用下的滚装船非线性横摇响应和重载荷位移响应进行了数值计算,并与线性响应进行了比较,从而得出了考虑非线性时横摇角显著偏大的结论。

THE NONLINEAR ROLLING OF FLOATING BASE SYSTEM WITH A RO-RO SHIP AND SLIPPING LOADS

Common effect of wave and slip of internal heavy loads will exacerbate rolling of the ro-ro ship. This is one of the important reasons for overturn of ro-ro ships. The floating base system is composed of a ro-ro ship and slipping heavy loads. The rolling angle of the ship and the transverse displacement of the heavy loads on deck are taken as two degrees-of-freedom. Considering the influence of the nonlinear restoration moment and nonlinear damping moment, and making use of dynamic method of multibodies system, dynamic equations of the floating base system are established. Taking a certain channel ferry as an example, numerical analysis is carried out for nonlinear rolling response of the ship and displacement response of the slipping heavy loads under common effect of synchro-slipping heavy loads and wave, and compared with linear response. Results show that the nonlinear rolling angle of the ro-ro ship increases markedly when considering the nonlinear characteristics.