Estimation of Dynamic Motions and Mooring Forces for Floating Type Offshore Platform Based on Hydrodynamic Analysis

doi:2012.26.2.48

J. Ocean Eng. Technol. > Volume 26(2); 2012 > Article

J. Ocean Eng. Technol. 2012;26(2):48-57.
DOI: https://doi.org/10.5574/KSOE.2012.26.2.048

Cha Ju-Hwan,Moon Chang-Il,Song Chang-Yong

Dept. of Ocean Engineering Mokpo National University,Dept. of Naval Architecture and Marine Engineering Graduate School of Mokpo National University,Dept. of Ocean Engineering Mokpo National University

동수력학 해석 기반 부유식 해양 플랫폼의 동적 운동 및 계류력 산정

차주환,문창일,송창용

목포대학교 해양시스템공학과,목포대학교 대학원 선박해양공학과,목포대학교 해양시스템공학과

Keywords: Floating type offshore platform, Hydrodynamic motion, Dynamic load, Mooring line, RAO (Response Amplitude Operators)

핵심용어: 부유식 해양 플랫폼, 동수력학적 운동, 동적하중, 계류삭, 진폭응답함수

Abstract

This paper deals with numerical analyses in the context of estimations of hydrodynamic motions and dynamic loads for a floating type offshore platform using some exclusive simulation code such as code for the simulation of a floating type of offshore crane based on multi-body dynamics, along with the commercial code AQWA. Verifications of numerical models are carried out by comparing the RAO results from the simulation code. In the verification analyses, hydrodynamic motions are examined in the frequency domain for the floating type offshore platform according to the mooring lines. Both the hydrodynamic motions and dynamic loads are estimated for floating type offshore platforms equipped with the catenary type and taut mooring lines. A review and comparison are carried out for the numerically estimated results. The structural safety of the connection parts in an offshore structure such as a floating type offshore platform is one of the most important design criteria in view of fatigue life. The dynamic loads in the connecting area between a floating type offshore platform and its mooring lines are estimated in detail according to variations in the mechanical properties of the mooring lines. The dynamic tension load on the mooring lines is also estimated.