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강국정,고성호,곽영균,이덕주,이인철,Kang, Kuk-Jeong,Ko, Sung-Ho,Kwak, Young-Kyun,Lee, Duck-Joo,Lee, In-Cheol 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.3
The present work addresses an experimental study on sound attenuation characteristics of silencer by live firing test. When a gun fires, there exists excessive noise which propagates as a form of blast wave. As muzzle energy of the weapon systems increases, the level of impulsive noise also increases. It is well known that the impulsive noise from a gun gives a serious damage to human bodies and structures. The adverse effects of impulsive sound also cause both social and military problems. So it is very important to study the characteristics of the impulsive sound attenuation. The live firing test is performed to evaluate the effect of four different silencers. The test result is compared with the case of bare muzzle which is not installed the silencer. The frequency characteristics are also analyzed to investigate the diminution of sound pressure level. The results of this study will be helpful to the designing silencer for large caliber weapon systems.
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.
박선영,배재성,황재혁,강국정,안상태,Park, Sun-Young,Bae, Jae-Sung,Hwang, Jai-Hyuk,Kang, Kuk-Jeong,Ahn, Sang-Tae 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.6
A soft-recoil or FOOB (Fire-Out-Of-Battery) system can reduce the recoil force considerably. Its firing sequency is different from that of a conventional or FIB (Fire-In-Battery) system. In FOOB system, the gun is latched and preloaded in its battery position prior to firing. When unlatched, the gun is accelerated to the forward direction and then the forward momentum of the recoil part is generated. Since this momentum reduces the recoil impulse, the recoil force will decrease significantly. When designing the soft-recoil system it is important to design the forward momentum profile of a recoiling part. In the present study, the method to determine the forward momentum has been studied and its optimum value has been obtained theoretically. The numerical simulation of the soft-recoil system is performed to show that the present soft-recoil system works functionally well.
우대현,이영신,김흥태,전상배,이규섭,강국정,Woo, Dae-Hyun,Lee, Young-Shin,Kim, Heung-Tae,Jun, Sang-Bae,Lee, Kyu-Sub,Kang, Kuk-Jeong 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.4
In the soft recoil system, the recoiling parts are initially accelerated to the forward direction. These parts are returned to original position by the firing with intial acceleration speed. The latch of the soft recoil system keeps the high impact load when the recoil parts were recuperated to the forward direction. In this study, the latch of soft recoil system using the ADAMS program was analyzed. The optimal operation parameters were found that max. angle and expansion length of latch was $50^{\circ}$, 180 mm respectively. Dynamic structural analyses of model cases were performed using finite element model. The max. stress and deflection of latch was 230 MPa and 0.45 mm respectively.
김종현(Jong-Hyun Kim),김영남(Young-Nam Kim),이진욱(Jin-Wook Lee),강국정(Kuk-Jeong Kang),한태호(Tae-Ho Han),안상태(Sang-Tae Ahn) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The using of this researched system must be done outdoors, where environmental factors such as sunlight, precipitation and wind. Usually drift in gun muzzle orientation by solar heating are generally attributed to thermal stresses generated by temperature differences on gun barrel. So there are needed some tank cannon components, such as thermal shrouds which are used to reduce the amplitude of such drifts. One purpose of this study by numerical analysis is to clarify the thermal shroud effects about thermal deformation of the gun barrel by solar heating and wind, and the other purpose of this study is to set up the process of the coupled analysis of fluid dynamics with thermal stresses.
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.
주퇴력 저감을 위한 연식 주퇴 메커니즘의 매개변수에 관한 연구
양태호(Tae Ho Yang),이영신(Young-Shin Lee),이규섭(Kyu-Sub Lee),전상배(Sang-Bae Jun),강국정(Kuk-Jeong Kang) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.7
연식주퇴 메커니즘은 전방 운동량으로 주퇴력을 감소시키는 메커니즘이다. 연식주퇴 메커니즘에 영향을 미치는 매개변수는 사격 각도, 복좌기의 초기 압력, 발사위치등과 같이 다양하게 존재한다. 이런 매개변수들은 연식주퇴 메커니즘에서 전방 운동량을 결정짓는 요소가 된다. 연식주퇴 메커니즘의 설계를 위해 몇 가지 적당한 조건들을 고려하여 전방 운동량에 영향을 미치는 매개변수들에 대해 연구하였다. 여러 가지 매개변수들 중에서 복좌기의 초기 압력과 사격 위치가 전방 운동량에 영향을 미치는 중요한 요소로 확인하였다. 복좌기의 초기 압력이 180 일 때, 주퇴력이 가장 낮은 값을 가진다. The soft recoil mechanism was an effective mechanism for reducing the recoil force by forwarding momentum. There were some parameters such as the fire angle, firing position, and initial pressure of the recuperator, which influenced the forwarding momentum. These parameters affected the generation of the forwarding momentum in the soft recoil mechanism. To design for the mechanism, the parameters affecting momentum were studied to consider some reasonable conditions. Among the various parameters, the initial pressure of the recuperator and firing position was confirmed as a key factor to have affected the momentum. It was determined that the recoil force had a minimum value when the initial pressure of the recuperator was 180.