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안진형,정찬희,Ahn, Jin-Hyeong,Jung, Chan-Hee 한국시뮬레이션학회 2012 한국시뮬레이션학회 논문지 Vol.21 No.1
In this study, underwater behaviors of negative buoyant body and positive buoyant body, which are ejected from a platform, are compared through eject test and simulation. CFD(Computational Fluid Dynamics) method is used to calculate the hydrodynamic derivatives of negative buoyant body with varied hull. Hydrodynamic derivatives that cannot be calculated with CFD are used with the same values of base shape. The pitch angles of test data are much bigger than those of simulated data, and the reason is supposed to be the trailing air effect. A more accurate simulation is possible via modified force modeling which reflects this phenomenon. The underwater behaviors of positive buoyant body and negative buoyant body are somewhat different with each other at the same eject condition, but it may not be a problem in the view of operation. 본 연구에서는 수중에서 사출되는 양성부력체와 음성부력체의 수중거동을 사출시험 및 시뮬레이션을 통하여 비교하였다. 다양한 형상을 갖는 음성부력체의 동유체력 계수는 전산유체역학(CFD: Computatioanl Fluid Dynamics) 기법을 이용하여 계산하였으며, CFD에 의해 계산될 수 없는 계수는 기본형과 같은 값을 적용하였다. 종동요각의 시험 값은 시뮬레이션 값보다 훨씬 크게 나타났는데, 이는 추종공기 효과로 추정하였으며, 이 현상을 반영하여 외력 모델링을 수정함으로써 더욱 정확한 시뮬레이션이 가능하였다. 양성부력체와 음성부력체의 수중거동은 같은 사출 조건에서 다소 차이를 보이지만, 운용의 관점에서는 별다른 문제가 없는 것으로 판단하였다.
도시 이미지 형성을 위한 건축물 외피 디자인에 관한 연구
안진형(Ahn Jin-Hyeong),김억(Kim Uk) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(계획계)
The purposes of this study are to analyze elements and methods that create urban images maximizing the value of a city and to apply methods that express urban images through the surfaces of downtown buildings in metropolitan cities. This study investigates the meanings, concepts and historical changes of urban images in theoretical ways and summarizes the elements of urban images in terms of social, humane studies, technological, scientific, ecological and geographical aspects using diagrams that shows the relations between the elements and urban characteristics. The organic relationship between the surface design of buildings and the construction of urban images is defined by connecting these urban image construction methods and application with the expression methods of the surface design of buildings. In addition, this study examines the types of urban environments with emotional expressions and symbolic expressions. This study also proposes a new design expression direction by connecting metaphorical elements such as rhythm, movement, transparency and ambiguity with one another in a ubiquitous urban environment so that citizens can emotionally recognize the sensual expression methods of the surface design of buildings such as texture, color, lighting, pattern, shape and movement.
선박의 조종성능을 반영한 충돌위험도 추론에 관한 기초 연구(Ⅰ)
안진형(Jin-Hyeong Ahn),이기표(Key-Pyo Rhee) 한국항해항만학회 2005 한국항해항만학회 학술대회논문집 Vol.1 No.-
선박의 충돌회피 문제에서 충돌위험도 모델은 보통 시뮬레이터 상에서 파라미터를 변화시켜 가며 수행한 전문가 인터뷰 결과를 이용하여 세우는 것이 일반적이며 이 때 파라미터로는 흔히 DCPA와 TCPA가 사용된다. 그런데 이 방법은 비용이 많이 들뿐더러 인터뷰 대상자와 운항 환경 등이 달라짐에 따라 다른 결과를 내게 된다는 단점이 있다. 본 연구에서는 운항자와의 인터뷰를 거치는 대신 시뮬레이션을 통해 확인된 자선의 조종성능을 반영한 퍼지 추론 시스템을 구성하기로 한다. 피항을 시작해야 하는 충돌 위험도 값에 대응하는 시간과 거리로는, 타선이 법규를 위반했을 때 자선이 피항을 시작해야만 하는 최소 여유 시간과 일반적으로 해상교통법 등에서 지시하는 최소 여유 거리를 각각 사용했다. 이렇게 구성된 퍼지 추론 시스템은 퍼지 소속 함수의 개수를 늘임으로써 비선형성이 강해진 충돌위험도 추론 시스템으로 재구성할 수 있다. In collision avoidance problem of a ship, collision risk model is usually set up using the interview results from experts who sit on a simulator by varying parameters, in which DCPA and TCPA are commonly used. This method, however, has the weakness in that not only it is expensive but also it shows different results depending on the interviewees and other navigational parameters. In this study, a fuzzy inference system is designed based on own ship's maneuverability verified from simulation instead of interviewing navigators. The time and distance corresponding to the collision risk value on which avoidance maneuver should be started are set to the minimum marginal time at which own ship starts maneuvering and the minimum marginal distance suggested by marine traffic rules respectively. This system can be reconfigured as a nonlinearity-strengthened one by increasing the number of fuzzy membership functions.
배호석,김완진,김우식,최상문,안진형,Bae, Ho Seuk,Kim, Wan-Jin,Kim, Woo-Shik,Choi, Sang-Moon,Ahn, Jin-Hyeong 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.4
Recently, unmanned systems are largely utilized in various fields due to the persistency and the least operational risk and an unmanned surface vehicle(USV) is the one of the representative application in the naval field. To assign multiple roles to an USV, we developed a sonar system which consists of a forward detecting sonar for the long-range detection, a downward detecting sonar for the small target scan and identification, and a strut type body for mounting sonar systems. In this paper, we described the developed sonar system for USV and the sea test results for verifying system performance. The test results showed that the developed sonar system was able to detect the underwater target about several kilometers away and could recognize a small object at the downside of the sonar system. We expect that the developed sonar system will be easily applied to other unmanned platforms without serious consideration.
시뮬레이션 기반 수중 운동체의 유체력 미계수 결정 및 6자유도 운동해석
고광수(Gwangsoo Go),안형택(Hyung Taek Ahn),안진형(Jin-Hyeong Ahn) 한국해양공학회 2017 韓國海洋工學會誌 Vol.31 No.5
This paper introduces a simulation-based determination method for hydrodynamic derivatives and 6DOF (degrees-offreedom) motion analysis for an underwater vehicle. Hydrodynamic derivatives were derived from second-order modulus expansion and composed of the added mass, and linear and nonlinear damping coefficients. The added mass coefficients were analytically obtained using the potential theory. All of the linear and nonlinear damping coefficients were determined using CFD simulation, which were performed for various cases based on the actual operating condition. Then, the linear and nonlinear damping coefficients were determined by fitting the CFD results, which referred to 6DOF forces and moments acting on an underwater vehicle, with the least square method. To demonstrate the applicability of the current study, 6DOF simulations for three different scenarios (L-, U-, and S-turn) were carried out, and the results were validated on the basis of physical plausibility.