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Investigation of the complex dynamics of float-over deck installation based on a coupled heave-roll-pitch impact model

机译:基于升沉-倾角-倾角耦合模型的浮桥安装复杂动力学研究

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摘要

This paper describes an efficient methodology for analysing the dynamics of float-over deck installation, particularly arising from the wave-induced impacts between multiple structures. A coupled heave-roll-pitch impact model is developed in the time-domain to analyse the complex impact behaviour associated with float over deck installations. The resulting time-domain model is very efficient since the time-consuming convolution terms are replaced by state-space models. The shock absorbers known as Leg Mating Units (LMUs) at the deck to-substructure (DTS) connections, and Deck Support Units (DSUs) at the deck-to-barge (DTB) connections, are modelled as spring-damper systems with limited load capacities. By considering the coupled heave-roll pitch motions of the float-over system, the resulting impact model is applied to analyse the complex vertical interactions between the deck and barge and between the deck and substructure at both the 0% and 100% load transfer stages. LMU/DSU impacts and DTS/DTB impacts are analysed here. In addition, the effects of varying wave excitations are investigated based on the coupled impact model.
机译:本文介绍了一种有效的方法,用于分析浮桥式甲板安装的动力学,尤其是由波浪引起的多个结构之间的碰撞所引起的动力学。在时域中开发了一个耦合的升沉-倾角-倾角碰撞模型,以分析与甲板上方漂浮物相关的复杂碰撞行为。最终的时域模型非常有效,因为耗时的卷积项被状态空间模型代替。甲板至子结构(DTS)连接处的腿部匹配单元(LMU)和甲板至驳船(DTB)连接处的甲板支撑单元(DSU)的减震器被建模为弹簧阻尼器系统负载能力。通过考虑浮标系统的升沉-滚动俯仰运动的耦合,将所得的冲击模型应用于分析在0%和100%载荷传递阶段甲板与驳船之间以及甲板与下部结构之间的复杂垂直相互作用。 。此处分析了LMU / DSU影响和DTS / DTB影响。另外,基于耦合冲击模型研究了变化的波激励的影响。

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