单点系泊船舶非线性动力学特性的试验研究

对潮流作用下单点系泊船舶的静态分岔特性和动态分岔特性进行了试验研究.通过试验确定了船舶的平衡系泊点及其Liapunov运动稳定性.以来流速度和系缆长度为分岔控制参数,研究了船舶系泊运动的静态分岔与Hopf分岔特性.对系统的动力学行为进行了定性分类,据此在参数空间中给出了局部分岔集.它将参数平面划分为四个不同的区域,每个区域中船舶的运动模式均不相同,但同一区域内系统的动力学行为是一致的.研究表明,单点系泊船舶具有复杂的动力学响应,试验中观察到吸引子的共存与跳跃和Hopf分岔现象.局部分岔集的确定为系泊系统设计参数的选择提供了依据.

Experimental research on the nonlinear dynamic characteristics of single point mooring vessels

Experimental research on the static bifurcation characteristic and dynamic bifurcation characteristic of a single point mooring (SPM) ship model subjected to tidal current was presented.The equilibrium points of mooring and their stability of motion in the sense of Liapunov were investigated by means of experiments.Static bifurcation characteristic and Hopf bifurcation characteristic were investigated while current velocities and mooring line lengths were defined as the bifurcation control parameters.Local bifurcation set was found in the parameter space according to the classifications of the dynamic responses of the moored ship model.The bifurcation control parameters space could be divided into several parts.There are different motion modes when bifurcation control parameters are in the different area of the parameters space.It is shown that complex dynamic responses exist in the motions of SPM moored vessels,and the coexistence of different attractors,stability loss of equilibriums and Hopf bifurcations are all observed.The local bifurcation set under the conditions of this experiment is obtained while its importance to the design of mooring systems is also indicated.