Continuous multi-body dynamic analysis of float-over deck installation with rapid load transfer technique in open waters

Abstract

Targeting at the innovative float-over deck (FOD) installation with rapid load transfer technique, the continuous numerical simulations of the specific mating process are conducted based on the coupled multi-body model developed in the paper, where the detailed interaction effects of the Leg mating unit (LMU) and the Deck support unit (DSU), especially the time-varying hydrodynamic forces are considered simultaneously. The established model coincides with the experimental and SIMO results in terms of barge motion responses both at regular and random wave excitations. The motions of barge and topside as well as the corresponding loads of the LMU and DSU are analyzed. It shows that the quick load transferring operation leads to significant changes on barge motion responses and the trim angles of barge and topside have significantly influence on the loads of DSU and LMU. Moreover, the feasibility of the rapid FOD installation system at harsh open sea condition is carried out and arriving that it is functional well when suffering from long period swell. The results prove that the continuous simulation method representing the real-situation of the rapid load transfer technique can constantly investigate the consecutive responses and detect the potential risk of the FOD installation in advance.