Lowering Simulation using Floating Crane in Waves

doi:2012.26.1.17

J. Ocean Eng. Technol. > Volume 26(1); 2012 > Article

J. Ocean Eng. Technol. 2012;26(1):17-26.
DOI: https://doi.org/10.5574/KSOE.2012.26.1.017

Nam Bo-Woo,Hong Sa-Young,Kim Byoung-Wan,Lee Dong-Yeop

Marine Stucture & Plant Research Department KORDI,Marine Stucture & Plant Research Department KORDI,Marine Stucture & Plant Research Department KORDI,Chungnam National University

파랑 중 해상 크레인의 하강 작업 수치 시뮬레이션

남보우,홍사영,김병완,이동엽

한국해양연구원 해양구조물.플랜트연구부,한국해양연구원 해양구조물.플랜트연구부,한국해양연구원 해양구조물.플랜트연구부,충남대학교 선박해양공학과

Keywords: Floating crane, Lowering simulation, Upending simulation, Wave-induced motion, Tension, Winch

핵심용어: 해상크레인, 하강 시뮬레이션, 상승 시뮬레이션, 파랑운동, 장력, 윈치

Abstract

A coupled analysis of a floating crane barge with a crane wire and hanging structure is carried out in thetime domain. The motion analysis of the crane barge is based on the floating multi-body dynamics, and thecrane wire is modeled as a simple spring tension. The hanging structure is assumed to be a rigid body with 3 degree-of-freedom translational motion. In this study, numerical simulations were conducted at three different stages. First, the developed code was validated by comparing the time-domain motion response of a crane barge with the frequency-domain results. Then, a coupled analysis of a crane barge and simple structure hanging by the crane wire was performed using the present scheme. The motion response and wire tension from the present calculations are compared with the results of OrcaFlex. The agreement between the two sets of results isfairly good. Last, lowering simulations in regular and irregular waves were conducted considering buoyancy changes in the hanging structure. The effects of the wave conditions, structure's weight, wire length, and lowering speed on the wire tension are considered.