• Journal of the Institute of Electronics and Information Engineers
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• v.49 no.11
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• pp.103-109
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• 2012

Samsung Thales has developed a small-sized autonomous underwater vehicle "BOTO" verified by a mathematical model simulation. The hydrodynamic coefficients and drag force were experimented at circulating water channel for validating cruising performance of the AUV. Based on the mathematical model, we simulated turning radius and way-point tracking on horizontal plane using way-point tracking algorithm. In this paper we introduce the vehicle system and the sea trial test results will be shown.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.49 no.4
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• pp.263-272
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• 2021

In this study, aerodynamic coefficients obtained from Computational Fluid Dynamics (CFD) using wind tunnel test-like method is compared with coefficients obtained by actual wind tunnel test. Unsteady analysis has performed with using harmonic equation for motion of the external store. Aerodynamic database is generated based on CFD results to simulate 6 degree-of-freedom store separation analysis. Trajectory is obtained from simulation using both CFD-based and test-based database, and results are compared with trajectory from flight test result. It is concluded that generation of database based on CFD with wind tunnel test technique is valid from good agreement of the trajectory.

• Journal of the Korea Society for Simulation
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• v.21 no.1
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• pp.89-96
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• 2012

Recent modeling and simulation technologies are being used in various fields, especially in the field of military simulation-based acquisition (Simulation Based Acquisition) is recognized as an essential policy. In test and evaluation phase of the SBA process, to build a simulation-based T&E(test and evaluation) environment is needed when T&E cannot be carried by real weapon system. To improve efficiency and reliability for T&E, interoperability, reusability and reliability for T&E equipments and systems are important. In this study, we propose applying simulation framework for efficienct test and applying VV&A process for reliable evaluation. We describes the characteristics of the development process, the actual test cases and the results of evaluation. Finally utilization plan and the future direction of research is described.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.69-70
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• 2016

선박과 유빙의 충돌로 발생하는 빙하중은 선체의 구조강도 문제뿐만 아니라 선박의 속력감소 및 조종운동에도 영향을 미친다. 이 연구에서는 DEM (Discrete Element Method) 기법을 이용하여 유빙을 항해하는 선박의 조종성능 평가를 위한 수치 시뮬레이션 프로그램을 개발한다. 여러가지 유빙 조건에서 선회성 시험 및 10/10 지그재그 시험을 시뮬레이션하여, 유빙의 상태가 선박의 조종성능에 미치는 영향을 파악한다.

• Journal of the Korea Society for Simulation
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• v.27 no.1
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• pp.111-117
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• 2018

It is indispensable for a missile to track a target under the flight condition since the tracking capability affects the system performance considerably. The best way to verify the tracker's performance is flight test while it costs too much. Consequently, captive flight test or CFT has an important role in the development of a missile system. CFT, however, cannot simulate missile dynamics and is an offline and open-loop test. In this paper, we propose a new integrated-flight simulation(IFS) method using CFT imagery to overcome the limitation of synthetic image-based IFS method. This method increases the utilization of CFT's outputs and compensates the reality of imagery which lacks in the synthetic image-based IFS. Using this method make it possible to verify the system capability in various simulation modes.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.13-13
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• 2017

선회시스템의 수명을 정확히 예측하기 위해서는 굴삭기의 상부회전체 및 선회시스템의 모든 구성요소들의 질량관성모멘트를 고려하여 선회감속기의 수명 평가를 수행해야 한다. 선회감속기의 수명 평가방법은 주로 실험실 시험으로 수행이 되며, 시험 장비는 장비 구축 편의성과 비용 등의 이유로 증속기와 굴삭기 상부회전체의 등가 관성체 등으로 구성된다. 굴삭기 선회시스템의 정확한 등가 실험실 시험을 위해서는 시험에 사용되는 등가 관성체의 관성모멘트를 정확히 결정하는 것이 매우 중요하다. 본 연구는 굴삭기 선회시스템의 등가 실험실 시험을 위해 굴삭기 상부회전체의 관성모멘트를 결정하기 위하여 수행되었다. 굴삭기 선회 시험을 통하여 선회감속기 입력 속도 및 토크를 측정하였고, 반복계산법을 이용하여 굴삭기 상부 회전체의 등가관성모멘트를 계산하였다. 굴삭기 상부회전체의 시뮬레이션 모델을 개발하여 선회 시험 결과와 시뮬레이션 모델 비교 분석을 통해 굴삭기 시뮬레이션 모델을 검증하고, 검증된 모델을 이용하여 상부회전체의 관성모멘트가 반영된 등가 실험실 시험 시뮬레이션 모델을 개발하였다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.29 no.6
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• pp.457-463
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• 2018

This paper compares the results of ${\Sigma}{\Delta}-STAP$ applied to actual radar test data and simulation data. The radar received a target signal from a virtual target generator and the clutter signal from a signal generator in an anechoic chamber. The simulation data were generated from ideal baseband radar signal modeling using the same parameter as that for the test radar. The ${\Sigma}{\Delta}-STAP$ results of the test and simulation data are similar in terms of the target signal shape and noise level. The SINR(Signal-to-Interfrence-plus-Noise Ratio) loss also had similar aspects, but the simulation result shows 1~2 dB higher SINR loss than the test result. This result verified that the simulation data can be a reasonable alternative test data when the ${\Sigma}{\Delta}-STAP$ is applied.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.4 s.97
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• pp.178-188
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• 1999

충격하중을 받는 시험편 높이의 1/4 길이의 notch를 가진 3점 굽힘시험편들의 기계적 거동에 관한 컴퓨터 시뮬레이션을 하고 이 시뮬레이션에 대한 실험적 검증도 하여 그 타당성을 입증하였다. 시험편들의 양쪽 가장자리(지지점)에서 작용되어지는 여러 가지의 하중속도에 대한 경우들과 탄소성 von Mises 재질인 모델들을 시뮬레이션에 포함시켰으며 이들에 대한 결과들을 간극 개구 변위, 반력, 크랙선단 개구 변위 및 변형률등이 속도에 의존되는 재질(점소성 재질)에 대한 시뮬레이션 결과와 비교하였다. 또한 여러가지의 동적 하중을 받는 상황하에서의 안정성이 본 연구의 시뮬레이션을 통하여 비교되었으며 그 차이점들이 규명되었다.

• Journal of Advanced Navigation Technology
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• v.28 no.1
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• pp.95-101
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• 2024

This paper aims to establish a reconfigurable flight simulation environment to conduct safety evaluation of various electric vertical take-off and landing (eVTOL) aircraft. Since the inceptor, aircraft dynamics model, and controller applied to each eVTOL aircraft are different, it was configured to be variable so that a simulation can be executed for each eVTOL aircraft. Test elements and performance indicators were set to perform safety evaluation of eVTOL aircraft. Ground auxiliary equipments were designed and implemented in a simulation environment according to test procedures for each test element. In addition, to analyze safety performance, a simulation flight data collection environment based on MATLAB/Simulink and a tool for safety performance analysis were implemented. Test flight and analysis were conducted in the implemented simulation environment in this paper. Finally, this study shows the environment was verified by confirming that it was performed normally.

• Journal of the Korea Society for Simulation
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• v.23 no.4
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• pp.211-218
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• 2014

The Test and Evaluation (T&E) system became more important due to its advancement and complexity of the weapon system. Time and cost saving T&E related studies are in progress mainly with advanced countries. By utilizing the Modeling and Simulation (M&S) technology recently, we may save time and money. Also, overcome security and safety limitations. There are many M&S based research activities in South Korea but it is way behind of the system that some countries already have developed. i.e.; United States. This area of study requires new way of developing strategies in the T&E system of Korea. This study is to design the Operational T&E system for weapon systems based on modeling of processes. And we modeled the processes of operational performance evaluation through utilizing resources and performance modules of weapon systems and combined it with the simulation engine for 3D visualization. Through this, we propose the Operational T&E system for weapon systems based on modeling of processes that represent operational performances visually.