Nonlinear Motion Responses of a Moored Ship beside Quay

J. Ocean Eng. Technol. 2003;17(4):8-15.

안벽에 계류된 선박의 비선형 운동응답

이호영,임춘규,유재문,전인식

목포대학교 선박해양시스템,현대미포조선㈜ 사업기획부,충남대학교 공과대학 선박해양공학과,건국대학교 공과대학 토목공학과

Keywords: Source and Dipole Distribution Method, Drift Force, Time Domain Analysis, Quay, Rope Mooring

핵심용어: 소오스-다이폴 분포법, 표류력, 시간영역 해석, 안벽, 로우프 계류

Abstract

When a typoon sets into harbour, a moored ship shows erratic motions and even mooring line failure may occur. such troubles may be caused by harbour resonance phenomena, resulting in large motion amplitudes at low frequency, which is close ti the natural frequency of th moored ship. The nonlinear motions of a ship moored to quay are simulated under external forces due to wave, current including mooring forces in time domain. The forces due to waves are obtained from source and dipole distribution method in the frequency domain. The current forces are calculated by using slow motion maneuvering equation in the horizontal plane. The wind forces are calculated from the empirical formula of ABS and the mooring forces of ropes and fenders are modeled as linear spring.