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신철봉(Shin, Chul-Bong),배재성(Bae, Jae-Sung),황재혁(Hwang, Jai-Hyuk),강국정(Kang, Kuk-Jeong),안상태(Ahn, Sang-Tae),한태호(Han, Tae-Ho) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.7
A fire-out-of-battery(FOOB) mechanism, which is a new recoil technology, can reduce dramatically the level of a recoil force compared to the conventional recoil system. The FOOB mechanism pre-accelerates the recoil parts in direction opposite of conventional recoil before ignition. This momentum of the recoil parts due to pre-acceleration can reduce the firing impulse. In this paper, the dynamics of the recoil system with this FOOB mechanism is formulated and simulated numerically. The results of the simulation show that the FOOB system can reduce the recoil force and stroke compared to the conventional system under normal condition. When the fault modes happen, the FOOB system may not perform well and may be damaged seriously due to excessive recoil force and stroke. Hence, the control of the fault modes is necessary to achieve the normal operation of the FOOB system. The results that an additional MR damper enables the FOOB system to perform well under all firing condition.
100% 면경편포의 정련, 표백 및 반응성염료 염색성에 관한 연구
김연주,신철봉,조현태,Kim, Yeon-Ju,Sin, Cheol-Bong,Jo, Hyeon-Tae 한국섬유공학회 1981 한국섬유공학회지 Vol.18 No.3
Effects of pH and temperature on shrinkage of grey knits (slip) and effects of scouring renditions on shrinkage, reflectance, handle and reactive dyeing Properties of loon cotton warp knits were studied. The results are as follows. In solution of room temperature and pH 71-13 the maximum area shrinkage was about 20%, pH has no effect on area shrinkage but on linear shrinkage. Three dimensional the loop which caused a knit to shrink was caused by the twist of yarn. Temperature has no effect on area shrinkage of grey knits. In mixed solution of sodium hydroxide and soda ash, the decrease of concentration ratio of soda ash made the reflectance decrease and the softness increase. Equilibrium adsorption was decreased as the pH of dye bath increased but the maximum fixation was obtained at pH 10. Scouring conditions have some effect on the rate of adsorption but a few effect on the rate of fixation.
배재성,신철봉,황재혁,강국정,Bae, Jae-Sung,Shin, Chul-Bong,Hwang, Jai-Hyuk,Kang, Kuk-Jeong 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.4
In order to reduce the level of recoil force, new recoil technology must be employed. The present study discusses a soft-recoil system that can reduce dramatically the recoil force. The firing sequence of the soft recoil system is radically different from that of a conventional system. The gun is latched and preloaded in its out-of-battery position prior to firing. When unlatched, the gun is accelerated and forward momentum is imparted to the recoiling parts. This momentum is opposed by the ballistic force imparted by firing and the recoil force and stoke will be reduced. In the present study, the soft-recoil system with hydraulic dampers is simulated and its characteristics are investigated theoretically. The results of the simulation show that the soft-recoil system could dramatically reduce the recoil force and the recoil stroke compared to the conventional recoil systems. However, the soft-recoil system was not able to perform well when the firing fault modes like prefire, hang-fire, and misfire happen. Hence, we need to employ a control algorithm to prevent the damage of the recoil system due to these fault mode.