• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1999.10a
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• pp.17-17
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• 1999

액체램제트 추진기관은 고체로케트 추진기관에 비해 복잡한 구조와 작동원리를 가지고 있지만 산화제인 공기를 대기로부터 직접 흡입하므로 비행체의 크기와 중량을 줄이고 순항거리를 최대한 증대시킬 수 있는 장점을 가지고 있다. 이러한 램제트 추진기관의 개발 및 실용화를 위해서는 램제트 추진기관의 유동 및 연소지상시험 설비의 구축이 필수적이다. 본 연구에서는 그 기초연구로서 연소기 입구의 속도, 온도와 같은 실제 액체램제트 추진기관의 비행조건을 완벽하게 모사할 수 있는 Vitiated Air Heater의 설계기술 확보에 연구목적을 두었다.

• Aerospace Engineering and Technology
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• v.9 no.2
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• pp.51-56
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• 2010

There are two main software in COMS ground station at the normal mode operation - stationkeeping and wheel off-loading. In this paper, ground software validation test for wheel off-loading is summarized and described. The wheel off-loading was performed the design change from E3000 heritage and analyzed. The wheel off-loading of ground software has two part; one is wheel off-loading management for parameters change at the thruster set switching time and the other is wheel off-loading set-point being sent to satellite for the reference momentum.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.781-783
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• 2011

The oxidizer filling system, ground facility of the launch complex, should accept difficult requirements from the launcher sufficiently. The launcher do not have unnecessary insulators for mass reduction and manages liquid oxygen mass fastidiously to satisfy the mission requirement. So, the ground facility should be able to accept its requirements, then we should make the operating process being adjusted. In this paper, the operating process design and verification results on the oxidizer filling ground facility for liquid rocket is demonstrated.

• Journal of Aerospace System Engineering
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• v.11 no.6
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• pp.17-25
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• 2017

Vertical reaction force between ground and tire is an important parameter determining the ground behavior characteristics of aircraft. This parameter can be used to calculate the lateral force and friction. However, it is hard to obtain this parameter in real-time when the aircraft is taxiing. Therefore, pre-analysis of ground behavior and vertical reaction force should be conducted using ground simulation results to prevent rollover or hazardous scenarios. In this paper, a Landing Gear and Full-Aircraft model was constructed using VI-Aircraft S/W. The roll behavior of aircraft was analyzed using steering simulation results compared with taxi-test data.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.42 no.12
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• pp.997-1003
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• 2014

This paper describes modeling process to obtain precise landing gear model which is necessary to design a control law for ground auto-taxi, auto take-off/landing of UAV. In this paper, landing gear side force modeling is studied to complete a landing gear model of UAV. Side force modeling is performed by calculating cornering angle including steering angle. And ground directional controller is designed by using nose wheel steering and rudder steering at the same time to control course angle error. Accuracy of landing gear side force modeling and ground directional controller is proved by comparing of auto-taxi test results with simulation results.

• Journal of the Korean Society of Propulsion Engineers
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• v.15 no.2
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• pp.23-28
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• 2011

The engine ground and altitude tests were carried out to investigate the effect of jet fuel alteration on the performance of a small turbojet engine. JP-S was supplied 8% higher than JP-8 by fuel metering system at the same command. The employment of JP-S showed the similar starting characteristic to that of JP-8, however, difference in the ignition time and acceleration rate of engine speed due to the difference of fuel flow rate by fuel metering system was observed. In spite of jet fuel alteration, the test results yield the similar steady-state engine performance in net thrust, air flow, exhaust gas temperature, etc. On the other hand, the fuel consumption of JP-S increased by 5 % compared with that of JP-8. In point of specific fuel consumption (SFC), SFC of JP-S was approximately 1.1~2.6 %, 5 % higher than that of JP-8 in ground and altitude tests respectively at the same thrust.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.11a
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• pp.410-415
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• 2010

The engine ground and altitude tests were carried out to investigate the effect of jet fuel alteration on the performance of a small turbojet engine. JP-S was supplied 8% higher than JP-8 by fuel metering system at the same command. The employment of JP-S showed the similar starting characteristic to that of JP-8, however, difference in the ignition time and acceleration rate of engine speed due to the difference of fuel flow rate by fuel metering system was observed. In spite of jet fuel alteration, the test results yield the similar Steady-State engine performance in Net thrust, Air flow, Exhaust Gas Temperature, etc. On the other hand, the Fuel consumption of JP-S increased by 5 % compared with that of JP-8. In point of Specific Fuel Consumption (SFC), SFC of JP-S was approximately 1.1~2.6 %, 5 % higher than that of JP-8 in ground and altitude tests respectively at the same thrust.

• Journal of the Korean Society of Propulsion Engineers
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• v.26 no.1
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• pp.77-87
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• 2022

In order to perform the scramejt engine intake ground test using the Scramjet Engine Test Facility(SETF) of the Korea Aerospace Research Institute. we introduced the test availability check procedure that is generally conducted. The design process of the newly manufactured Mach 5 nozzle for the scramjet intake test was summarized, a device for checking the core flow distribution of the nozzle was explained, and the core flow test analysis results were written. Through a series of test results, it was confirmed that the intake was located in the new Mach 5 nozzle core.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.11a
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• pp.407-410
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• 2008

TEST CELL(엔진 시운전실)은 다양한 형태의 자원들이 결합한 종합 시스템이다. 즉, 건물 및 각종 설비로부터 엔진운용에 직접적으로 필요한 각종 제어 및 계측장비, 그리고 엔진운용자가 안전하고 정확하게 엔진을 구동하고 그 결과를 빠르고 쉽게 분석하게 하는 장비 및 운용 소프트웨어에 이르기까지 다양한 특성의 많은 서브 시스템들이 유기적으로 결합되어야 한다. 또한 주변 환경에 최대한 영향을 주지 않도록 소음, 진동 등이 발생되지 않아야 하므로 그 전체 시스템구성이 복잡하고 다양한 분야의 전문적인 지식과 시스템기술을 필요로 한다. 엔진의 지상성능시험에는 여러 단계의 시험을 거쳐야 하는데 그 중에서 지상성능시험은 엔진의 성능상태를 확인하는 시험이다. 여기에 TEST CELL(엔진시운전실)의 구성품을 추구하는데 저렴한 비용으로 설계하는 방안을 열거하고자 한다.

• Journal of Digital Contents Society
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• v.16 no.2
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• pp.275-282
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• 2015

Since starting of terrestrial digital broadcasting in 2001, there has been discussion on introduction of multiple broadcasting services, one of advantages of digital broadcasting. In the mean time, task force on terrestrial multiple channel experimental broadcasting was formed with government organizations, broadcasting companies and household appliance companies in Oct. 2013, and terrestrial multiple channel experimental broadcasting was started between Jan. to April, 2014. Based on this experimental result, EBS started 2HD MMS experimental broadcasting first in Korea on Feb. 11, 2015. This study was carried out in consideration of operation of 2 HD channels in existing 6MHz bandwidth based on MPEG-2 codec with development of compression technology. A study on image quality optimization was carried out and applied to 2HD MMS experimental broadcasting through application experiment of variable bit rate and change according to 1080i and 720p scanning type.