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김기표,장쾌현,최상경,홍종태,Kim, Ki-Pyo,Chang, Kwe-Hyun,Choi, Sang-Kyung,Hong, Jong-Tai 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.6
A smart submunition drops through the expected trajectory to have a appropriate target searching footprint for the armored ground vehicles. Parachutes can be used as a tool to decelerate and spin the submunition. Usually submunition's descent velocity, spin rate, submunition inclination angle against vertical and dynamic stability affect to its target searching footprint. Therefore it is important to design optimal parachute and load configuration for the overall system performance. In this paper we described the dynamic motion of submunition by the mathematical model of parachute and load. Through the computer simulation we can analyze the submunition footprint affected by parachute and load design.
김형준,최성욱,권미라,황준식,장쾌현,Kim, Hyung Jun,Choi, Sung Wook,Kwon, Mi Ra,Hwang, Jun Sik,Chang, Kwe Hyun 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.3
The composition of bright flash device is a pyrotechnic mixture consisting of metal powder, oxidizer and additives. A pyrotechnic mixture of bright flash device generates a bright flash through burning after being ignited by initiator. The function of bright flash is to distract or incapacitate electro optical sensor systems and enemy eyes temporally. This study is to develop composition of pyrotechnic mixture of bright flash and to analyze the test results by considering intensity and efficiency of light.
김경식(Kyung-Sik Kim),안재운(Jae-Woon Ahn),장쾌현(Kwe-Hyun Chang) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
It is well known that high intensity flash can paralyzes various kinds of electro-optical sensors and causes flash blindness temporarily. The shoulder fired rocket launcher have been considered as a candidate of the munitions for the high intensity flash generator. The material properties of the shell for the high intensity flash should have high optical transmittances and mechanical durabilities to radiate the generated light effectively and withstand the set-back force. The polycarbonate has been selected as the shell material and the optimum thickness of the shell was determined by the structure analysis. In addition, the suitability of the polycarbonate at the optimum thickness is verified by the spectrum test. Also, the structure of the shell and the airtightness of the noble gas are confirmed by the explosion tests.
지능형 포탄의 저 감속 회수장치를 이용한 포탄의 감속방법
김명구(Kim, Myoung-Gu),조종두(Cho, Chong-Du),이승수(Lee, Seung-Su),유일용(Yu, Il-Young),장쾌현(Chang, Kwe-Hyun) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.9
With the development of micro electronic circuits and optical equipment, the demand for developing smart munitions with the ability to autonomously search for and attack targets has increased. Since the electronic components within smart munitions are affected by high temperatures, pressure, and impulsive forces upon the combustion of gunpowder, stability and reliability need to be secured for them. Securing those stability and reliability requires soft recovery system which can decelerate smart munitions. A theoretical analysis of flow is performed for the secure recovery of bullets on the basis of Euler equation for compressible fluids. The inner pressure on a pressure tube, the speeds of bullets, and the deceleration of munitions are calculated theoretically. Theoretical results are compared with the data from the experiment with soft recovery system set up at the laboratory.