Layer | Fill | Outline |
---|
Map layers
Theme | Visible | Selectable | Appearance | Zoom Range (now: 0) |
---|
Fill | Stroke |
---|---|
Collaborating Authors
Freight & Logistics Services
Experimental Study On the Side-by-Side Offloading Operation of FSRU And LNGC
Cho, Seok Kyu (Korea Ocean Research & Development Institute (KORDI)) | Sung, Hong Gun Sung Gun (Korea Ocean Research & Development Institute (KORDI)) | Hong, Sa Young (Korea Ocean Research & Development Institute (KORDI)) | Hong, Seok Won (Korea Ocean Research & Development Institute (KORDI)) | Kim, Yong Su (DAEWOO Shipbuilding & Marine Engineering (DSME)) | Ha, Moon Keun (Samsung Heavy Industries (SHI)) | Choi, Young Dal (STX Offshore & Shipbuliding (STX)) | Yu, Byoung Suk (Total Marine Services (TMS)) | Jang, Rae Dae (Korean Register of shipping (KR))
ABSTRACT The motions and mooring loads of turret moored FSRU (Floating Storage & Regasification Unit) and LNGC (Liquefied Natural Gas Carrier) including sloshing are studied by experiments. Turret moored FSRU weathervanes on a turret and side-by-side (SbS) LNGC moves and interacts with FSRU. FSRU and LNGC have LNG cargo tanks and sloshing affects the motions and loads due to the coupling between sloshing and floating body motions. The performance of FSRU and LNGC offloading system is investigated through the assessment of global motions, accelerations, mooring loads and Ship-To-Ship (STS) loads. It is noted that although the direction of head moves to bow quartering, the sloshing occurs in longitudinal mode and affect the surge motion and mooring load. STS mooring affects the sway and roll motion of LNGC and interacts with LNGC sloshing. INTRODUCTION The side-by-side offloading operation of LNG can be influenced by many factors; mother ship's mooring system, STS mooring system, gap flow between two bodies, LNG sloshing, and environments etc. The performance of offloading operation is decided by the operation possibility (downtime) of LNG offloading system. The criteria of offloading operation are the relative motions of surge, sway and heave and the forces of fender and mooring rope. To assess the offloading operation precisely, the factors which influence motions and mooring loads should be considered. Representative studies for the side-by-side transportation are Voogt (2010, 2009), Jeong (2010), Hansen (2009), Hong (2009), and Wilde (2009). The previous works report the results without sloshing. But Cho (2011) presented that the longitudinal sloshing affect the motions of SbS FSRU and LNGC. Also the drift forces are changed by the coupled motions with sloshing. In order to investigate the important factors of offloading operation, experiments were carried out at KORDI (Korea Ocean Research & Development Institute)'s ocean engineering basin.
- Research Report > New Finding (0.66)
- Research Report > Experimental Study (0.51)
Experimental Study On Torsion Springing And Whipping of Large Container Ship
Hong, Sa Young (Marine Structure & Plant Research Department, Korea Ocean Research and Development Institute – Daedeok) | Kim, Byoung Wan (Marine Structure & Plant Research Department, Korea Ocean Research and Development Institute – Daedeok) | Nam, Bo Woo (Marine Structure & Plant Research Department, Korea Ocean Research and Development Institute – Daedeok)
As the size of container ships increases, the springing and whipping phenomenon has been among important design considerations due to its significant effect on wave loads and fatigue analysis. Thus the need for reliable model test data is increasing for validation of state-of-the-art analysis tools for the springing and whipping. In the present study, a model system for the measurement of torsion springing and whipping has been described. The model was composed of an elastic backbone and a segmented container ship in which the natural frequencies of bending and torsion were matched to the target values. A series of model tests has been conducted for the selected cases of springing and whipping in regular and irregular waves. Discussions were focused on the physics of torsion springing and whipping observed in the model test, and technical difficulties associated with interpreting the torsional moment from measured strains from the backbone model. INTRODUCTION As the size of container ships increases, the springing and whipping phenomenon has been among important design considerations due to its significant effect on wave loads and fatigue analysis. The increasing importance of evaluating the springing and whipping effects on large container ship's structural integrity continuously has been driving classification societies to develop and enhance their analysis tools and the procedures associated with the evaluation of structural loads and fatigue analysis. Most analysis tools for wave loads and dynamic responses, including hydroelastic effects used in major classification societies, have been based on potential theory and 3D panel methods combined with a simplified beam model or full FEM (Finite Element Method) model (G-Hydroflex, HydroSTAR, NLOAD3D, WISHFLEX (Hong et al., 2010), but the RANS (Reynolds Averaged Navier-Stokes equation) approach has become a potential alternative for analyzing nonlinear wave forces due to the recent advances in CFD (Computational Fluid Dynamics) technology.
- North America > United States (0.68)
- Asia (0.68)
- Research Report > New Finding (0.52)
- Research Report > Experimental Study (0.52)
- Transportation > Marine (1.00)
- Transportation > Freight & Logistics Services > Shipping > Container Ship (1.00)