随机海况下浮式结构物时域响应分析  

Time Domain Response Analysis of Floating Structures under Stochastic Sea Conditions

作　　者：杜海越 张天明 杨林林 李红涛[1] 崔洪宇[2] DU Haiyue;ZHANG Tianming;YANG Linlin;LI Hongtao;CUI Hongyu(Offshore Engineering Technology Center,China Classification Society,Tianjin 300457,China;Marine EngineeringCollege,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]中国船级社海洋工程技术中心,天津300457 [2]大连理工大学船舶工程学院,辽宁大连116024

出　　处：《船舶工程》2024年第1期134-141,共8页Ship Engineering

基　　金：国家自然科学基金项目(U20A20327,52271265)。

摘　　要：为快速准确地获得随机海况下浮式结构物的时域响应,提出一种快速计算结构时域响应的方法。建立有限元应力模式的动力学方程,论证节点在周期荷载作用下的稳态解形式;推导节点应力响应函数的计算公式;将海况波浪谱分解,通过叠加应力响应方式计算随机海况下节点应力的时域响应。通过数值仿真验证及具体的工程项目应用,证明了该方法的可行性和优越性,为浮式平台时域疲劳分析提供了一种新思路。In order to obtain the time domain response of floating structures under random sea conditions quickly and accurately,a method for calculating the time domain response is proposed.The dynamic equation of the finite element stress model is established,and the steady state solution of the node under periodic load is demonstrated.The calculation formula of the stress response function of the joint is derived.The sea state wave spectrum is decomposed and the time domain response of node stress under random sea state is calculated by means of superimposed stress response.The feasibility and superiority of the proposed method are proved by numerical simulation and concrete project application,which provides a new idea for time domain fatigue analysis of floating platform.

关 键 词：浮式结构物 时域疲劳分析 应力传递函数 海浪谱 数值验证 

分 类 号：U671.99[交通运输工程—船舶及航道工程]