The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
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MOORING SYSTEM DESIGN AND ASSESSMENT FOR A MULTI-MODULE VERY LARGE FLOATING STRUCTURE


Go-down ichd2016 Tracking Number 75

Presentation:
Session: Ship hydromechanics resistance III
Room: Room 1
Session start: 15:30 Mon 19 Sep 2016

Bo Wu   paulwu_china@163.com
Affifliation: China Ship Scientific Research Center, No.222 East Shanshui Road, Wuxi, Jiangsu, 214082, P.R.China

Xiaoming Cheng   chengxiaoming@cssrc.com.cn
Affifliation: China Ship Scientific Research Center, No.222 East Shanshui Road, Wuxi, Jiangsu, 214082, P.R.China

Chao Tian   ctian@cssrc.com.cn
Affifliation: China Ship Scientific Research Center, No.222 East Shanshui Road, Wuxi, Jiangsu, 214082, P.R.China

Xinyun Ni   nixinyun@cssrc.com.cn
Affifliation: China Ship Scientific Research Center, No.222 East Shanshui Road, Wuxi, Jiangsu, 214082, P.R.China


Topics: - Ship hydrodynamics resistance, propulsion, powering, seakeeping, manoeuvrability, slamming, sloshing, impact, green water

Abstract:

Very Large Floating Structure (VLFS) has a great potential for various industrial applications. A VLFS usually has large dimensions and consists of multiple modules, each can be a normal-sized floater. The mooring system design for a multi-moduled VLFS is a challenging task for the reason that the huge dimensions and mass of the structure will incur extremely high environmental loads and inertia forces, and to constrain the movement of such a structure using a mooring system, in particular in shallow water, requires accurate assessment of the environmental loads on the structure and careful design and optimization of the mooring system, any under-design may lead to a failure of the mooring system and severe consequences; on the other hand, an over-design can mean a significant cost increase. This paper presents the design, analysis and results of a mooring system for the positioning of a multi-moduled VLFS in shallow water. The mooring system is of a catenary type consisting of chains and steel wire ropes. The VLFS consists of five identical rigid modules with hinge-like connectors linking adjacent modules. The analysis was conducted numerically in both regular and irregular waves on the basis of linearized wave theory with the hydrodynamic interaction between modules taken into account. The numerical simulations were performed for the moored VLFS in various environmental conditions including wave, current and wind was carried out in time-domain. The mooring line tensions, VLFS motions in six degrees of freedom and connector forces were obtained for a number of wave, current and wind headings. The work presented in the paper can be used as a reference for the mooring system design and optimization of similar multi-moduled floating structures.