• 한국산학기술학회논문지
• /
• 제21권6호
• /
• pp.584-591
• /
• 2020

무기체계에 있어서 신뢰도는 중요한 요소이다. 신뢰도가 낮으면 무기체계가 제대로 기능하지 못할 가능성이 높으며, 이는 우리군의 전투력 약화로 직결된다. 본 논문에서는 현재 우리 군이 개인화기로 사용하는 5.56 mm 소총의 구조를 총열, 윗총몸, 노리쇠집, 가스활대, 복좌용수철 및 밀대, 아랫총몸, 개머리 총 7개의 조립체로 분류하고, 소총이 정상작동하기 위한 8대 기능에 대하여 설명하였다. 또한 소총의 신뢰도의 개념을 고장 간 평균사격발수(MRBF: Mean Round Between Failure, 이하 MRBF)로 정의하고, 수리가능 시스템에 대한 신뢰도 분석 이론으로서 포아송 과정 모형과 이 모형에 대한 추세를 검정하기 위한 방법으로 TTT(Total Time on Test, 이하 TTT) 도시방법에 대하여 설명하였다. 다음으로 소총의 고장을 주기성 교환품목을 제외한 부품의 교환으로 정의하여 획득한 야전운용제원을 정제하였으며, 정제된 야전운용제원을 MINITAB 프로그램에 입력하여 신뢰도를 분석하였다. 그 결과 소총의 신뢰도는 251.73발로 분석되었으며, 소총의 조립체별 신뢰도 분석을 통해 개선이 필요한 조립체로 총열, 아랫총몸, 개머리 조립체를 식별하였고, 개선이 필요한 세부 부품 10가지를 식별하였다. 마지막으로 현재 획득 가능한 야전운용제원을 이용한 신뢰도 분석의 한계점에 대하여 고찰하였다.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2004년도 춘계학술대회
• /
• pp.722-727
• /
• 2004

This paper includes the comparative study between Cr plating and nitriding process with an aim at improving corrosion, wear and maintainability for KNR(Korean Next Generation Rifle) 5.56mm barrel. The endurance test was conducted to compare the performance of standard barrel, Cr plating barrel and nitriding barrel. Main activities are described as follows; optimal Cr plating and nitriding process set-up for KNR 5.56mm barrel; durability test of each barrel(20,000 rounds); salt water immersion test; dispersion, initial velocity, inner diameter data acquisition. According to the results of this firing test, Cr plating barrel is superior to standard barrel and nitriding barrel in view of corrosion, wear and maintainability

• 품질경영학회지
• /
• 제48권1호
• /
• pp.13-27
• /
• 2020

Purpose: The purpose of this study is to present a recoil measurement and analysis of K2 rifle for the development of a virtual reality marksmanship training in the Republic of Korea Army. Methods: For the recoil measurement, a test-bed is built by a barrel that has exact dimensions of K2 rifle and three piezoelectric pressure sensors mounted on the barrel. Data of over 200 rounds of 5.56mm M193 and K100 bullets are collected and analyzed from live fire experiments. For the recoil analysis, both the free recoil method and the gas exhaust aftereffect method are used to calculate a recoil velocity, momentum and kinetic energy of K2 rifle by applying the law of conservation of momentum. In addition, a new method is proposed that uses the third law of motion and the chamber pressure model for the recoil measurement Results: The results show how different between the previous and proposed methods with respect to M193 and K100 bullets of K2 rifle. In M193, the free recoil method demonstrates 1.113, 4.197, and 2.335, the gas exhaust aftereffect method computes 1.698, 6.407, and 5.441, and the proposed method calculates 0.990, 3.734, and 1.848 in recoil velocity, momentum and kinetic energy, respectively. In K100, the free recoil method demonstrates 1.190, 4.487, and 2.669, the gas exhaust aftereffect method computes 1.776, 6.699, and 5.949, and the proposed method calculates 1.060, 3.998, and 2.119 in recoil velocity, momentum and kinetic energy, respectively. Conclusion: This study implements live fire experiments to provide recoil velocity, momentum, and kinetic energy of K2 rifle using both M193 and K100 bullets. For the development of the army virtual reality marksmanship, the results in this paper would be useful to design and produce a gun and/or a rifle of virtual reality.

• 한국군사과학기술학회지
• /
• 제7권1호
• /
• pp.5-12
• /
• 2004

This paper includes the comparative study between Cr plating and nitriding process with an aim at improving corrosion, wear and maintainability for KNR(Korean Next Generation Rifle) 5.5mm barrel. The endurance test was conducted to compare the performance of standard barrel, Cr plating barrel and nitriding barrel. Main activities are described as follows; optimal Cr plating and nitriding process set-up for KNR 5.56mm barrel; durability test of each barrel(20,000 rounds); salt water immersion test; dispersion, initial velocity, inner diameter data acquisition. According to the results of this firing test, Cr plating barrel is superior to standard barrel and nitriding barrel in view of corrosion, wear and maintainability.

• 한국산학기술학회논문지
• /
• 제21권9호
• /
• pp.49-56
• /
• 2020

소총 사격 중 발생하는 고온의 열은 총기의 성능을 저하시킬 뿐 아니라 사용자의 원활한 운용에 제한을 가져온다. 본 연구에서는 인간공학 설계 기준을 참조하여 사격에 따른 총열덮개의 온도변화를 측정하고 재질에 따른 운용성을 검토하였다. 인간공학 설계 기준은 피부에 직접적으로 닿을 경우 단열재를 필요로 하는 것을 명시하고 있다. 이에 따라 사격시험을 위하여 총열덮개의 재질별로 대한민국 제식소총 3종과 해외 모델 1종을 선정하였으며, 접촉식 온도 측정기를 이용하여 사격시험을 실시하였다. 시험결과 열전도도가 낮은 플라스틱 총열덮개를 사용하는 소총과 열전도도가 높은 알루미늄 총열덮개를 사용하는 소총 모두 낮은 온도에서 100발 이상 사격에도 맨손으로 운용이 가능하였다. 그러나 평균 대기온도에서 약 60발 이상 사격 시 알루미늄 총열덮개는 맨손으로 운용이 제한되며, 다량으로 빠른 시간에 사격이 이뤄질 경우 덮개 재질에 관계없이 총열덮개의 운용이 제한되었다. 소총의 발열에 의한 운용제한 해소를 위해서는 장갑 또는 손잡이, 덮개 등을 활용하여 피부와 직접적인 접촉 차단이 필요하다. 본 연구를 통해 소총의 열 위험에 대한 운용성을 파악할 수 있었으며, 타 소총 및 군수품의 인간공학적 설계를 위한 기초자료로 활용 될 수 있을 것으로 기대된다.

• 대한기계학회논문집A
• /
• 제31권7호
• /
• pp.764-776
• /
• 2007

On the human-rifle system, the human body is affected by the firing impact. The firing impact will reduce the firing accuracy and change the initial shooting posture. Therefore the study of biomechanical characteristics using human-rifle modeling and numerical investigation is needed. The musculoskeletal model is developed by finite element method using beam and spar elements. In this study structural analysis has been performed in order to investigate the human body impact by firing of 5.56mm small caliber machine gun. The firing experiments with the standing shooting postures were performed to verify analytical results. The result if this study shows analytical displacements of the human-rifle system and experimental displacements of the real firing. As the results, the analytical displacement and stress of human body are presented.

• 한국군사과학기술학회지
• /
• 제22권1호
• /
• pp.27-34
• /
• 2019

This paper presents a chamber pressure model development of K2 rifle by applying Gaussian mixture model. In order to materialize a real recoil force of a virtual reality shooting rifle in military combat training, the chamber pressure which is one of major components of the recoil force needs to be investigated and modeled. Over 200,000 data of the chamber pressure were collected by implementing live fire experiments with both K100 and M193 of 5.56 mm bullets. Gaussian mixture method was also applied to create a mathematical model that satisfies nonlinear, asymmetry, and deviations of the chamber pressure which is caused by irregular characteristics of propellant combustion. In addition, Polynomial and Fourier Regression were used for comparison of results, and the sum of squared errors, the coefficient of determination and root-mean-square errors were analyzed for performance measurement.

• 한국군사과학기술학회지
• /
• 제10권3호
• /
• pp.208-216
• /
• 2007

As the propellant mass is being accelerated out of the gun chamber along with the projectile, a continuous pressure gradient exists between the end of chamber and the base of the projectile. For this reason, the base pressure-travel curve is very important to design a conventional gun barrel in the interior ballistics, but it is not obtained briefly by empirical or theoretical method. In this paper, a simple relation between chamber pressure and base pressure was determined by the factor of base pressure(Cb) obtained from the experimental method. The simple relation gives a reasonable prediction for the reduction of pressure between the breech and the base of projectile owing to the axial gradient in the gun tube. The predictions have been validated by the infrared screen sensor and the PRODAS(PROjectile Design and Analysis System) for interior ballistic systems. Therefore, the base pressure-travel curve could be calculated from the chamber pressure measured by piezoelectric sensor. The base pressure-travel curve obtained from the simple relation offers initial information to gun barrel designer and is used for calculation of muzzle velocity.

• 분석과학
• /
• 제23권3호
• /
• pp.322-329
• /
• 2010

총기사고에서 용의자 식별의 기초자료로 활용하기 위하여 3가지 유형의 한국형 총기인 K1A 기관단총, K2 소총, K5 권총의 뇌관화약잔사(Primer GSR)를 SEM-EDX로 분석하였다. 실내사격장에서 각 1발씩 3회 사격하여 얻은 뇌관화약잔사의 형태, 크기, 입자수 그리고 성분분석을 통한 각 입자의 원소 함량비율을 확인하였다. 뇌관화약잔사 입자는 대부분 Ba>>Pb>Sb의 함량비율을 갖고 있었지만 특정 형태의 입자에서는 Sb>Pb>Ba 혹은 Pb>Sb>Ba 등 Ba원소보다 Sb원소의 함량이 많게 나타난 입자가 발견되었다. 원소 성분비율이 차이가 나는 각 입자들을 통계처리 한 결과 사용된 탄의 종류에 따라 5.56 mm 탄을 사용한 K1A, K2 소총에서보다 9 mm 탄을 사용하는 K5권총에서 Sb원소가 Ba원소보다 함량비율이 큰 입자의 수가 3~8배 많은 것으로 확인되어 소총과 권총을 구분할 수 있었다. 또한 입자의 크기와 입자의 수에서도 역시 구분이 가능함을 확인할 수 있었다.

• 한국소음진동공학회논문집
• /
• 제26권5호
• /
• pp.578-583
• /
• 2016

In order to provide a basis data for design of small arms and their silencer, an experimental study on firing noise of small arms was performed around the muzzle of a gun. For this experimental comparison analysis, the target small arms were included most operating small arms in our country. The sound pressure levels were measured at a certain distance which was predetermined according to US army firing test procedure, TOP 3-2-045. By this experimental study, the sound pressure levels of 5.56 mm caliber small arms are 143 dB ~ 145.4 dB and 7.62 mm caliber small arms are 144 dB ~ 145.2 dB. Between the heavy machine gun K12 and M60, the sound pressure level of K12 is slightly lower than M60.Also silencer for K14 snifer rifle was tested. Using this result, it has been found that the reduction effect of the silencer is 15.4 dB but the improvements of silencer performance in the high frequency range have to be studied later on.