• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.30 no.3
• /
• pp.96-104
• /
• 2002

탄체가속기용 초기 발사장치로 사용 가능한 건국대 초고속 발사장치가 개발되었다. 이는 2단계 기포 (gas gun) 형태의 발사장치로 공기를 작동 기체로 사용하여 무게 22g의 탄체를 750m/sec로 가속할 수 있 는 성능을 보인다. 초고속 발사장치의 성능 특성을 알아보기 위하여, 구동부의 압축 특성과 작동 특성에 대한 성능 실험을 수행하였으며 실험으로부터 피스톤에 의한 압축 이득과 1,2차 구동부간에 발사장치의 성능을 최상으로 유지할 수 있는 값들이 존재함을 확인하였다. 초고속 비행체의 공력 특성 및 주위의 유동 해석에 응용 가능한 고속 탄환체에 대한 흐름의 가시화를 수행하여 수치적 계산 결과와 비교하였으며, 향후 고속유동의 물리적 현상 해석에 이용될 수 있음을 확인하였다.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.39 no.10
• /
• pp.912-918
• /
• 2011

The purpose of this research is to determine the dynamic roll-damping data of a spinning projectile in wind-tunnel testing. In the present work, the high-speed wind-tunnel tests for the roll-damping measurements were conducted on a spin-stabilized projectile model in the Agency for Defense Development's Tri-Sonic Wind Tunnel at spin rates about 12,000 rpm. The test Mach numbers ranged from 0.7 to 1.05, and the angles of attack ranged from -4 to +10 deg. The validity of the wind-tunnel measurement techniques was evaluated by comparing them with the previous test results on the same configuration.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2022.11a
• /
• pp.203-204
• /
• 2022

This study reviewed the impact resistance properties according to the thickness of concrete as part of a research on the protection technology for high-velocity projectile that may occur during an explosion of small green energy facilities such as a hydrogen station and an energy storage system.

• The Bulletin of The Korean Astronomical Society
• /
• v.37 no.2
• /
• pp.133.2-133.2
• /
• 2012

위성체는 발사체에 탑재되어 임무수행을 위한 우주설정궤도로 이동하게 된다. 이 과정중 발사체에서 분사되는 방대한 양의 추진제, 고속 추진에 따른 페어링 외기의 동압 변화등은 위성체가 안치되어 있는 페어링 내부에 수천 Hz의 주파수 대역에 걸쳐 130 ~ 150 dB에 이르는 음장을 형성한다. 이러한 페어링 내부의 고에너지 음장은 위성체 구조물 및 탑재물의 기계적인 진동을 유발하여, 물리적인 파손을 일으키거나 주요 기능에 중대한 결합을 유발 시킬 수 있다. 이에 따라 위성체는 개발단계에서부터 소음환경에 대한 검증시험을 수행하게 된다. 지상에서의 검증시험은 잔향실과 음향 모듈레이터로 구성되어 있는 음향챔버 시스템을 이용하여 수행된다. 음향 모듈레이터는 기화된 고압의 대용량 질소가를 이용하여 발사체에서 생성되는 고 에너지의 소리를 발생하게 된다. 본 논문에서는 음향환경 시험용 음향 모듈레이터에 대한 분석, 시험을 바탕으로 작동 원리 및 음향특성 분석을 수행하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2017.10a
• /
• pp.536-538
• /
• 2017

UHD high speed digital camera system will be installed around launch pad and launch complex tower to acquire high speed image for motion analysis of integral parts of launch vehicle during the lift-off of KSLV-II in the Naro space center. In this paper, We compared configuration of high speed digital camera system operating in the Naro space center with UHD high speed digital camera system for mission of KSLV-II.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2022.04a
• /
• pp.220-221
• /
• 2022

With reent changes in energy sources, infrastructure facilities for energy charging are increasing around living areas. The infrastructure facilities have a slight possibility of explosion, and for this research on protection is needed. In this study, the performance of the reinforcement type is reviewed by examining the destructive properties after applying the impact by the high-velocity projectile to the cement composite to which various reinforcement methods are applied.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2006.11a
• /
• pp.367-370
• /
• 2006

The ballistic range has long been employed in a variety of engineering fields such as high-velocity impact engineering, projectile aerodynamics, creation of new materials, etc, since it can create an extremely high-pressure state in very short time. Two-stage light gas gun is being employed most extensively. The present experimental study has been conducted to develop a new type of ballistic range which can easily perform a projectile simulation. The ballistic range consists of a high-pressure tube, piston, pump tube, shock tube and launch tube. The experiment is conducted to find out the dependence of various parameters on the projectile velocity. The pressure in high-pressure tube, pressure of diaphragm rupture and projectile mass are varied to obtain various projectile velocities. This study also addresses the effect of the presence of a shock tube located between the pump tube and launch tube on system study. The experimental results are compared with those obtained through an author's theoretical study.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2010.05a
• /
• pp.345-348
• /
• 2010

Light gas guns have a large number of applications in various fields of engineering. A two-stage light gas gun can develop an extremely high pressure in a very short interval of time. This can be employed efficiently in the application of ultra-high pressure liquid jets. In general, the two-stage light gas gun is made up of a high pressure tube, a compression tube and a launch tube, each stage being separated by diaphragms. The first diaphragm is installed downstream of the high pressure tube and the second, downstream of the compression tube. In the present study, experiments are carried out to investigate the projectile velocity and pressure behavior in the tubes according to the pressure changes at diaphragm opening. It is found that the rupture pressure of the first diaphragm has a dominant influence on projectile velocity. It is also observed that at pressures greater than 14 bar, the pressure in the launch tube exceeds that in the compression tube.

• Journal of Advanced Navigation Technology
• /
• v.27 no.5
• /
• pp.519-527
• /
• 2023

Air-launch means launching from aircraft such as fighter jets, and has various advantages, such as cost reduction and less environmental/weather impact during launch. However, there are no air-launch satellite in Korea. Examining air-based launch satellite and anti-satellite missiles operated and developed by foreign private companies and various countries confirmed the necessity of domestic research and development. In South Korea, various research activities, including satellite launch system design and development approaches for different launch platforms, have been carried out mainly by academia. Development of upward maneuver air launch technology which is launched in the air when the aircraft is moving upward is suggested. Additionally, an introduction to wind tunnel tests for safety separation verification is provided. A new concept for a test facility has been suggested to conduct drop tests.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2007.11a
• /
• pp.263-266
• /
• 2007

The ballistic range has long been employed in a variety of engineering fields such as high-velocity impact engineering, projectile aerodynamics, creation of new materials since it can create an extremely high-pressure state in very short time. Two-stage light gas gun is being employed most extensively. The present experimental study has been conducted to develop a new type of ballistic range which can easily perform a projectile simulation. The experiment is conducted to find out the dependence of various parameters on the projectile velocity. The pressure in high-pressure tube, pressure of diaphragm rupture and projectile mass and piston mass are varied to obtain various projectile velocities. The flow field is visualized to see flow around projectile.