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나영인,김선범,Nah, Young-In,Kim, Sunbum 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.3
This paper describes the simplified simulation method of the wire-guided underwater test body with natural supercavitation. In this paper, the simulation based model of the wire-guided underwater body with natural supercavitation is proposed by using preceding research and commercial flow-analysis software. By using the model, the 1-dimensional wire-guided body motion in natural supercavitation can be solved very fast with reliability. The suggested model is validated by the comparison of simulation results with experimental data.
스크립트 임베딩을 활용한 수중운동체 M&S 전술처리기의 기능 확장
손명조,김태완,나영인,Son, Myeong-Jo,Kim, Tae-Wan,Nah, Young-In 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.5
In the simulation of underwater vehicles such as a submarine or a torpedo, various type of simulations like an engineering level simulation for predicting the performance precisely and an engagement level simulation for examining the effectiveness of a certain tactic is required. For this reason, a tactics manager which can change the behavior of a simulation model according to external tactics is needed. In this study the tactics manager supporting a script language and engine which can represent various tactics and can help users define external input tactics for the tactic manager easily is suggested. Python and Lua which are representative among script languages have been compared and analyzed from the viewpoint of a tactic manage, and the tactic manger using the script engines of those script languages was implemented. To demonstrate the effectiveness of the tactic manager, a target motion analysis simulation of the warfare between a submarine and a surface ship.
나영인,이심용,Nah, Young-In,Lee, Sim-Yong 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.6
The analysis of water-entry impact forces acting on the fin shaft of high speed water-entry body is described. During the entry of high speed body into water, the physical phenomenon and flow properties are analyzed. A proper analysis model is established and the method to estimate the flow force which causes impact torque at the fin shaft is described. It is assumed that the fin shaft is damaged by the force which is induced by contacting with cavity wall. The pressure distribution of fin and the maximum torque are estimated and compared with breaking force. Conclusively, it is hard to resist water-entry impact force in terms of the reinforcement of fin shaft. Additionally safe equipment is essentially required.
나영인,이심용,윤한샘,Nah, Young-In,Lee, Sim-Yong,Yoon, Han-Saem 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.5
Exploiting models and simulations are encouraged among the defense acquisition society, as now enforced by the Defense Aquisition Program Administration's regulations. They are useful and, sometimes, inevitable especially in an earlier phase of system development. Computer-simulation-based experimentation technique for the system operational performance analysis for a torpedo defense system is introduced in this paper. Problem definition for the torpedo defense system analysis and engineering efforts for models and simulations development are presented here, including defining measures of performance and effectiveness for the torpedo defense system, conceptual modeling for torpedo engagement and defense simulation, design of experimentation, design of simulator and experimentor, and hardware and software implementation of an analysis support tool - a system operations demonstration and experimentation simulator.
신명수,문일성,나영인,박종천,Shin, Myung-Soo,Moon, Il-Sung,Nah, Young-In,Park, Jong-Chun 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.2
This paper presents the experimental result to investigate the characteristics of turbulent wake generated by submarine. A SUBOFF nude model which was assumed as an axial -symmetric body was used to create wake, and a thin strut was mounted on the top of the model. The experiments were conducted in a circulating water channel(CWC), and a hot-film was used to measure the turbulence in wake cross-section at the distance range of 0.0~2.0L from the model. The hot film anemometer measured turbulent velocity fluctuations, and the timeaveraged mean velocity and turbulent intensity are obtained from the acquired time-series data. Measured results show well the general characteristics of turbulent intensity, kinetic energy and mean velocity distribution. Also, experimental equations are derived. These experimental equations show well the general characteristics of the turbulent wake behind the submerged body with simple configuration.
자항하는 SUBOFF 모형 난류항적 계측 및 실험식 유도
신명수,문일성,나영인,박종천,Shin, Myung-Soo,Moon, Il-Sung,Nah, Young-In,Park, Jong-Chun 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.3
This paper presents experimental results and derived experimental equations to investigate the turbulent wake characteristics generated by the self-propelled SUBOFF submarine model. A self-propelled SUBOFF model which was assumed as an axial-symmetric body was used to create wake, and a thin strut was mounted on the topside of the model. The experiments were conducted in a circulating water channel(CWC), and the hot-film was used to measure the turbulence in wake cross-section at the distance range of 0.0~2.0L from the model. The hot film anemometer measured turbulent velocity fluctuations, and the time-averaged mean velocity and turbulent intensity are obtained from the acquired time-series data. Measured results show well the general characteristics of turbulent intensity, kinetic energy and mean velocity distribution. Also, this paper presents derived experimental equations, which is extended result to the reference [1]. These experimental equations show well the general characteristics of the turbulent wake behind the self-propelled submerged body.
신명수,문일성,나영인,박종천,Shin, Myung-Soo,Moon, Il-Sung,Nah, Young-In,Park, Jong-Chun 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.1
This paper presents bubble wake measurement results generated by the planing hull. The bubble was generated by SNAME TMB model(No. 4876) with hard chine at the CWC(Circulating Water Channel). ABS(Acoustic Bubble Spectrometer) was used to measure bubble wake measurement. The manufactured model is one meter in length and uniform velocity to generate the bubble at CWC is 3m/s, relatively higher speed than conventional hull form. Measurements were performed successfully and measured results show well the general characteristics of bubble wake generated by planing hull. Furthermore, experimental equations are proposed for the practical use.
점성 및 비점성 해석법을 이용한 초월공동 유동 수치해석
안병권,김지혜,최정규,김형태,나영인,이도형,Ahn, Byoung-Kwon,Kim, Ji-Hye,Choi, Jung-Kyu,Kim, Hyoung-Tae,Nah, Young-In,Lee, Do-Hyung 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.1
Recently supercavitating torpedo has been studied because of its high-speed performance as the next generation of underwater weapon systems. In this study, we present a numerical method based on the potential flow. Characteristic features of the shape of supercavities and drag forces are investigated. In addition, we introduce a viscous-potential method to compensate for the effects of viscosity. The results are compared with viscous calculations using a commercial package, FLUENT V13.
DEVS 통합개발환경 기반 모의 어뢰 표적탐지부 연동장비 개발
이민규,황근철,이동훈,나영인,김우식,Lee, Min Kyu,Hwang, Kun Chul,Lee, Dong Hoon,Nah, Young In,Kim, Woo Shik 한국시뮬레이션학회 2015 한국시뮬레이션학회 논문지 Vol.24 No.1
무기체계의 합리적인 요구사항 도출을 위해서는 많은 경험과 시행착오가 필요하지만, 현실적으로는 개발 비용과 위험 등의 이유로 M&S를 통한 접근이 일반적이다. 무기체계 획득 이외에도, 개발된 무기체계의 분석 또는 훈련을 목적으로도 M&S가 광범위하게 사용되고 있다. 국방과학연구소에서는 이러한 M&S의 필요성을 충족시키기 위해 모의실험 및 체계분석 구현에 필요한 M&S 공통기반기술 제공을 목적으로 해군 전투실험을 위한 DEVS 통합개발환경(QUEST)을 개발하였다. 본 논문에서는 모의 어뢰 표적탐지부 연동 아키텍처를 설계하고, QUEST의 무기체계 시뮬레이션 기능을 활용하여 모의 어뢰 표적탐지부 연동장비를 개발하였다. 모의 어뢰 표적탐지부 연동장비는 표적탐지 결과를 제공하는 어뢰 표적탐지부와 어뢰 표적탐지부의 성능 시험에서 필요한 시뮬레이션 시나리오를 제공하는 QUEST 시나리오 발생기로 구성된다. 모의 어뢰 표적탐지부 연동 아키텍처는 QUEST 시나리오 발생기와 어뢰 표적탐지부와의 연동을 통해 어뢰 표적탐지부의 성능 및 인터페이스를 검증할 수 있도록 설계되었다. It is necessary for us to undergo trial and error for eliciting the rational requirement of the acquisition of weapon systems, but the M&S is general approach due to costs and risk of the development. In addition to the acquisition of weapon systems, M&S is extensively employed in the analysis and the training of developed weapon systems. The ADD (Agency for Defense Development) has developed DEVS integrated development environment (QUEST) that provides M&S general ground technique composed of simulation model implementation services, simulation result analysis services, and simulation interface services. This paper describes the interface architecture and the implementation of torpedo target detection section interface simulation system using QUEST. The torpedo target detection section interface simulation system is composed of torpedo target detection section which calculates a result of target detection and the QUEST scenario generator which provides simulation scenario for performance test of the torpedo target detection section. The interface architecture of torpedo target detection section interface simulation system is designed to verify the interface and performance of the torpedo target detection section by linking with the QUEST scenario generator.