Analysis on Hull Block Erection Process Considering Variability
Abstract Research Institute of Marine Systems Engineering, Seoul National University, Seoul, South Korea The hull block erection network process, which is performed during the master production planning stage of the shipyard, is frequently delayed because of limited resources, workspace, and block preparation ratio. In this study, a study to predict the delay with respect to […]
Study on Ship Operation Performance in Actual Seaways Using Time-domain Free-Running Simulation
Abstract This study considers the evaluation of ship operational performance in real sea states using a time-domain approach. The current seakeeping-maneuvering coupling approach consists of two modules. First, in the seakeeping module, the time-domain three-dimensional Rankine panel method is applied to compute wave-induced forces and resultant ship motion. To validate this module, the computational results […]
Assessment Framework of Smart Shipyard Maturity Level via Data Envelopment Analysis
Abstract The fourth industrial revolution (“Industry 4.0”) has caused an escalating need for smart technologies in manufacturing industries. Companies are examining various cutting-edge technologies to realize smart manufacturing and construct smart factories and are devoting efforts to improve their maturity level. However, productivity improvement is rarely achieved because of the large variety of new technologies […]
Observation on Sloshing Flow and Hydrodynamic Pressures on Cylindrical Liquefied Natural Gas Tank with Swash Bulkhead
Abstract In this study, a series of sloshing model tests were conducted for type-C tanks, particularly to observe the effects of the inner bulkhead and rings. In regular pitch motion, the internal flow by swash bulkhead and rings located inside the tank was observed. The frequency range near the resonance frequency was checked at filling […]
Fatigue life prediction of ship and offshore structures under wide-banded non-Gaussian random loadings: Part II: extension to wide-banded non-Gaussian random processes
Abstract Ships and offshore structures are exposed to various cyclic loads such as winds, waves and currents in their lifetime. These loads can result in fatigue failures at hot spots, and to prevent such failures, accurate estimates of the fatigue life of hot spots should be performed in the design stage. The cycle distribution indicative […]
Numerical Study on Unsteady Pressure Distribution on Bulk Carrier in Head Waves with Forward Speed
Abstract This study deals with wave-induced unsteady pressure on a ship moving with a constant forward speed in regular head waves. Two different numerical methods are applied to solve wave–ship interaction problems: a Rankine panel method which adopts velocity potential, and a Cartesian-grid method which solves the momentum and mass conservation equations under the assumption […]
Study on Nonlinear Stochastic Process of Deck Slamming on Floating Offshore Platform
Abstract In this paper, a semi-analytic method is introduced to predict the deck-slamming probability and corresponding loads. This method is based on a nonlinear statistical approach that takes into account the linear and second-order components of the relative wave elevation up to the second order. The linear and second-order wave elevation is assumed to be […]
Underactuated Crane Control for the Automation of Block Erection in Shipbuilding
Abstract Block erection is one of the most common operations for moving a block in a shipyard. During the operation, the position and orientation of the block need to be precisely controlled to avoid accidents. However, the operation is performed manually, which is inefficient and potentially dangerous. Furthermore, the sophisticated cranes used for block erection […]
Experimental and Numerical Analysis of Wave Drift Force on KVLCC2 Moving in Oblique Waves
Abstract In this study, experimental and numerical methods were applied to estimate surge and sway wave drift forces and yaw drift moment acting on KVLCC2, advancing in oblique wave. An experiment was carried out in the ocean engineering basin of the Korea Research Institute of Ships and Ocean Engineering (KRISO). A series of regular wave […]
Fatigue predictions for flexible marine propellers using FSI analysis considering Euler force in the rotating frame
Abstract Analysis of flexible marine propellers in terms of their structural response and stress is the key to accurate fatigue prediction. At present, finite element method (FEM) analyses of flexible propellers have been performed as a part of the fluid–structure interaction (FSI) analysis using a numerical method for the flexible structures, which is identical to […]
