系泊多体海上平台非线性动力特性研究

海上浮式平台通常由多个大型浮体模块柔性连接，组成一个典型的刚柔流耦合的多振子网络系统。本文从网络动力学角度研究多体浮式海上平台，通过龙格库塔法求解海上浮式平台运动微分方程，得到海洋平台运动响应随连接件刚度变化情况。数值结果表明，连接件刚度变化使得多体海上浮式平台表现出丰富的非线性动力特性现象，例如幅值跳跃、分岔、混沌等现象。为进一步揭示非线性浮式平台的集体动力学行为，作出浮块在各响应阶段对应的时域图和相图比较。本文得到的初步研究结果及研究方法，可为大型海上浮体结构初步设计提供理论参考。

Nonlinear dynamic characteristics of mooring modules-offshore Platform

Offshore floating platform consists of multiple modules by flexible connectors. It is a typical dynamicnet-work system with flexible-rigid-fluid coupling. This article researches modules-offshore Platform from the perspective of network dynamics. Solving the differential equation of platform motion through the Runge-Kutta method and getting motion response of platform with fitting stiffness change. In numerical simulation, modules-offshore platform shows the abundant nonlinear dynamic characteristics, for example, the jump of amplitude, bifurcation and chaos. In order to further reveal the collective dynamics behavior of floating platform, making time-domain diagram and phase diagrams to compare.Prelimin-ary research results and research methods obtained in this paper can provide a theoretical reference for the design of very large floating structures.