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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.
안상태,강국정,홍석균,Ahn, Sang-Tae,Kang, Kuk-Jung,Hong, Suk-Kyun 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.3
The necessity for harmonically growing of economy and environment has been on the rise late in the twentieth century. Green transformation is defined as efficiency enhancement of conventional guns and ammunitions. We also define green innovation as evolution of fire power systems breaking with conventional methodology. This kind of green innovation could even change a paradigm of warfare in the future. In this paper, we classify the green technology in the field of fire power into five technological groups, and the research and development trend of green technology in the field of fire power is analyzed.
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.
〈응용논문〉 : 내부압력 작용하에서 자긴가공 실린더 구조의 응력거동
김학인(Hakin Gimm),강국정(Kuk Jung Kang),안상태(Sang Tae Ahn),홍석균(Suk Kyun Hong) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
압력용기와 실린더 형태의 구조설계 문제에 관한 이론과 실험적 연구는 매우 고전적인 문제임에도 여전히 연구 대상이다. 특히 군사용 포신 설계에서 자긴 가공으로 불리는 포열 두께 상에 과도변형 부여에 의한 압축 잔류응력 상태를 형성하여 포신의 허용 압력 증대와 이로 인한 피로수명을 높이는 기술은 새로운 포신 설계기술과 소재 발전에도 여전히 유효하다. 본 연구에서는 중공 장축 실린더 구조에 대해 자긴 이론에 관한 고찰과 이에 따른 수치해석을 통해 내부 압력이 작용된 실린더의 응력거동에 대해 살펴보았다. Although the efforts on theories and experimental works regarding the pressure vessels and gun tubes in cylinder are old aged issues, the subjects still remain the serviceable works to be continued in these days. Particularly the auttofrettage and overstraining for the gun tube in military use are still valid measures, even the advance in the technologies of gun and metallurgy, in order to enhance the operational performance with the improvement in fatigue life. Current work investigates the stress behaviors on the autofrettaged hollow cylinder which is subjected to an internal pressure loading, using the numerical methods as well as the review of theories
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.
박정삼,배재성,황재혁,강국정,Park, Jungsam,Bae, Jaesung,Hwang, Jaihyuk,Kang, Kukjeong 항공우주시스템공학회 2008 항공우주시스템공학회지 Vol.2 No.3
Eddy current are induced when a nonmagnetic, conductive material is moving as the result of being subjected to the magnetic field, or if it is placed in a time-varying magnetic field. These currents circulate in the conductive material and are dissipated, causing a repulsive force between the magnet and conductor. Using this concept, eddy current damping can be used as a form of viscous damping. This paper investigated analytically and experimentally the characteristics of an eddy current damping when a permanent magnet is placed in a conductive tube. The theoretical model of the eddy current damping is developed from electromagnetics and is verified from Maxwell program and experiments. From these comparisons, although predictability is not accurate at high excitation frequencies, the present model can be used to predict damping force at low excitation frequencies. In order to improve the prediction of the characteristics of an eddy current damping, the induced magnetic flux densities have to be considered in following researches.
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.
A Study on Analysis and Experiment of Composite Overwrapped Barrel
Ahn Sang Tae(안상태),Gimm Hak In(김학인),Kang Kuk Jung(강국정) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
SAFE is the abbreviation of operational procedure of weapon systems; see, aim, fire and eliminate. Reduction of weight of weapon systems helps obtain better performance on the steps of "aim" and "fire" out of the four steps. High strength steels have been normally used for conventional large caliber weapon systems. For the purpose of lightweight large caliber weapons, various materials could be concerned such as aluminum alloys, titanium alloys and advanced composite materials. By using composite materials for gun tubes, some benefits could be achieved. First, it basically helps reduce the overall weight of the weapon system as well as that of the gun tube itself. Second, smaller drive systems may be used. Third, better aiming accuracy could be achieved. As the first stage of the development of full scale gun tube with composite materials, a subscale thick-walled cylinder was manufactured and tested.
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.