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Development of 6-DOF Equations of Motion for a Planning Boat Based on the Results of Sea Trial Tests
전명준,이동현,윤현규 한국항해항만학회 2016 한국항해항만학회지 Vol.40 No.5
n general, the attitude of a high-speed planning boat changes following a speed change. Since the hydrodynamic forces acting on a ship differ according to the change of its underwater shape, it is difficult to estimate its hydrodynamic force compared to that of a large commercial ship. In this paper, 6 Degrees Of Freedom (DOF) equations of motion that express the maneuvering motion of a planning boat are modeled by analyzing its motion characteristics based on various sea trial tests. Finally, a maneuvering simulation is carried out and a validation of the equations of motion is confirmed with the results of sea trial tests.
전명준,윤현규,박종열,이신형,서정화 대한조선학회 2022 International Journal of Naval Architecture and Oc Vol.14 No.1
This article introduces the process of identifying the dynamics models of a combatant in intact and damaged condition based on the measured data from free running model tests. The applied system identification method is an Estimation-Before-Modeling approach, which estimates state variables and parameters separately. After estimating the states, the tendency of the hydrodynamic force acting on the combatant in intact and damaged conditions is compared. The modeling hydrodynamic force in intact and damaged conditions is performed based on the estimated hydrodynamic force tendency. Then, the process and results of identifying the hydrodynamic derivatives constituting the modeled hydrodynamic force are described. Differences of the hydrodynamic derivatives in intact and damaged conditions are analyzed, and maneuvering simulation is performed to verify them. The identified hydrodynamic derivatives are verified by performing maneuvering simulation and comparing the results with the measured data, and the asymmetric maneuvering characteristics of starboard and port maneuvering in the damaged condition are also confirmed.
요소항력모델을 활용한 선저검사용 ROV 모델링 및 트래킹 시뮬레이션
전명준(MyungJun Jeon),이동현(DongHyun Lee),윤현규(Hyeon Kyu Yoon),구본국(Bonguk Koo) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.5
The large drift and angle of attack motion of an ROV (Remotely operated vehicle) cannot be modeled using the typical hydrodynamic coefficients of conventional straight running AUVs and specific slender bodies. In this paper, the ROV hull is divided into several simple-shaped components to model the hydrodynamic force and moment. The hydrodynamic force and moment acting on each component are modeled as the components of added mass force and drag using the known values for simple shapes such as a cylinder and flat plate. Since an ROV is operated under the water, the only environmental force considered is the current effect. The target ROV dealt with in this paper has six thrusters, and it is assumed that its maneuvering motion is determined using a thrust allocation algorithm. Tracking simulations are carried out on the ship’s surface near the stern, bow, and midship sections based on the modeling of the hydrodynamic force and current effect.