파랑 중 해상 크레인의 하강 작업 수치 시뮬레이션
Lowering Simulation using Floating Crane in Waves
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초록
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.
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.
참고문헌 (8)
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- 이종현, "Analytical Research of Topside Installation in Mating phase with Crane Vessel", 한국해양공학회지, 25(4), pp.1~6 (2011), 한국해양공학회
- 이진우, "2자유도 서보제어기를 이용한 크레인의 Anti-Sway 제어", 한국해양공학회지, 12(4), pp.117~123 (1998)
- 최경식, "4기 크레인에 의한 침몰선체의 인양력 계산", 한국해양공학회지, 14(1), pp.17~22 (2000)
- DNV, "Modelling and Analysis of Marine Operations" (2011), Det Norske Veritas
- 최윤락, "Numerical and experimental study on hydrodynamic interaction of side-by-side moored multiple vessels", OCEAN ENGINEERING, 32(-), pp.783~801 (2005), PERGAMON-ELSEVIER SCIENCE LTD
- "OrcaFlex User Manual", Orchina, ~ (2010)