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Multibody dynamic analysis of a soft YOKE mooring system based on symplectic characteristics

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Indexed by:Journal Papers

First Author:Jin, Feng

Correspondence Author:Wu, Wenhua(lxyuhua@dlut.edu.cn)

Co-author:Wu, Wenhua,Lyu, Baicheng,Wang, Yanlin,Yue, Qianjin

Date of Publication:2019-10-05

Journal:Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University

Included Journals:EI、PKU

Volume:40

Issue:10

Page Number:1776-1783

ISSN No.:10067043

Abstract:The soft yoke mooring system (SYMS) is one of the typical single-point mooring systems in FPSO (Floating, Production, Storage, and Offloading). As a typical rigid multibody dynamic system, SYMS releases the rotational freedom of FPSO through the joint action of multi-hinge structure, realizing dynamic positioning of FPSO. In this paper, a multibody dynamic model of SYMS was established, and a symplectic algorithm, based on the Zu-type numerical integral method, is presented. The model was designed to solve the difficulty faced when solving differential-algebraic equations. The solution formulas were simple and satisfied the symplectic characteristics of the Hamilton system automatically. It also provided high accuracy for nonlinear systems. Two groups of prototypical monitoring data of six degrees of freedom (DOF) of FPSO under different sea conditions were selected to calculate the dynamic responses and corresponding mooring restoring force of SYMS. Simulated results indicated that, compared with traditional statics design methods, the present multibody symplectic dynamics calculation carried out in this paper could derive the structural stress state with a clear dynamic characteristic. The overall mechanical analysis of the structural displacement and stress behavior of mooring legs, YOKE, etc., can comprehensively evaluate the global mechanical behavior of SYMS. ? 2019, Editorial Department of Journal of HEU. All right reserved.

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