• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.150-153
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• 2005

The rifle impact of human body is affected by geometry of human for rifling. The interaction of human-rifle system influence a firing accuracy. In this paper, impact analysis of human model for standing postures with two B.C. carried out. ADAMS code and LifeMOD is used in impact analysis of human model and modeling of the human body, respectively. On the shooting, human model is affected by rifle impact during the 0.001 second. Also, Because Human Natural frequency is 5-200Hz, human impact is considered during 0.2-0.005 sec. Dut to the Firng test, Performed simulation time for shooting is 0.1 second. Applied constraint condition to human-rifle system is rotating and spherical condition. Also, The resulrt of changin the position of the grip is dfferent from the each other. As the results, The human model of firing was built successfully.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.423-424
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• 2014

ISO/TC 43 Acoustics 총회는 약 18개월 주기로 개최되어 음향분야 국제표준의 제,개정을 논의하고 추진한다. 최근의 ISO/TC 43회의는 2014년 5월 19일부터 23일까지 독일 베를린 DIN에서 개최되었다. ISO/TC 43의 관련 작업반(WG 1, 8, 9)회의와 함께 ISO/TC 43/SC 1 Noise 및 ISO/TC 43/SC 2 Building Acoustics의 관련 WG 회의도 진행되었다. ISO/TC 43에서는 ISO 1999 소음성 난청 평가 관련 표준을 개정하였다. ISO/TC 43/SC 1 Noise에서는 도로용 자동차의 쿨링팬 소음 측정방법, 사격장에서의 청력손실 측정방법, 헤드? 사용시 소음레벨 가이드 라인에 대한 표준 제정에 대한 NP(New Proposal)이 채택되었다. ISO/TC 43/SC 2 Building Acoustics에서는 소음 방사 효율 측정방법에 대한 표준안 제정이 제안되었다. 또한 ISO 10848-1 ~ 4 개정안 추진이 의결되었다. 건축물의 소음 평가 등급(WG 27) 및 소음성능 표시제도(WG 29)와 관련된 회의가 새롭게 진행되었다. ISO/TC 43 및 관련 SC, WG 회의를 통해 음향, 소음 전반에 걸친 국제표준의 제,개정이 의결되었으나, 국내 전문가들의 관심과 적극 참여는 부족한 것으로 판단된다. 향후 음향, 소음의 기술 및 연구 선도를 위해서는 국제표준활동에 대한 적극적인 참여와 지원이 필요하다.

• 대한토목학회논문집
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• 제42권5호
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• pp.671-679
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• 2022

국내 탄약 시험장과 군의 포탄 사격 훈련장은 잦은 사격과 폭발 실험으로 인해 충격파와 파편 등의 유해인자가 발생한다. 이에 따라 지역 주민의 민원이 급증하고 있으며 근접한 시설물과 인명피해의 위험이 크다. 최근 건설된 탄약 시험장은 부지확보 제한에 따라 반경 300 m 이내의 좁은 지역에서 화포 사격 및 로켓 추진기관 연소시험 시설을 구축하였으나 적절한 방호구조물이 없어 시설물 피해가 누적되고 있다. 따라서 본 연구에서는 화포 사격 및 로켓추진기관 실험 간 발생하는 소음, 진동, 충격파, 열 효과 등 유해인자에 대한 정량적 데이터를 측정하고 폭발 압력 특성을 분석하여 탄약 시험장의 강재 방호구조물 적용 연구를 수행하였다.

• 한국군사과학기술학회지
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• 제7권4호
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• pp.36-43
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• 2004

In 1909 Hiram P. Maxim invented one of the first metal silencers for reducing sound levels in firearms. Silenced me have been mainly applied in the hunting and military operation. In particular special force make use of silenced rifle because it is low sound level. This paper considers experimental analysis for the characteristics of shock wave caused by shooting of a silenced me. Experimental results Indicate that the sound level of K-7 silenced rifle was lower than the sound level of MP5 silenced rifle. And, Sound Power Level of K-7 silenced rifle at a distance more than 75m or loom have nearly the constant value. This results that suggested the characteristics data about K-7 rifle's impulse noise will be apply to design the silencer of a small arms.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 춘계학술대회논문집
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• pp.727-734
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• 2008

This research presents a laboratory study about difference of subjective response between with and without pictures. A main source is impulsive sound caused by leisure shooting. The sources are sampled from outdoor noise and their levels range from 40 to 75 dB at the interval of 5dB. The noise unit is based on A-weighted sound exposure level (ASEL; $L_{AE}$). To make equal ASEL of outdoor noise, finite impulse response (FIR) filter is applied to the originally sampled source to include the effect of distance attenuation. The evaluation method of the jury test adopted a Semantic Difference(SD) Method. The intersection point which two lines crossed was used as reference point. The intersecting point of mean response rating between with and without pictures was approximately 44ASEL and that of %HA was about 60ASEL. In the result of the test, the negative effect of pictures was given at a lower levels than intersection point while the positive effect was given at a higher levels than that.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.560-564
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• 2007

In order to reduce the level of recoil force, new recoil technology must be employed. The present study discusses a soft-recoil mechanism that can reduce dramatically the recoil force. The dynamics of the soft-recoil system with hydraulic dampers are described and simulated. The results of the simulation show that FOOB system can reduce the recoil force and the recoil stroke compared to conventional systems. However, the FOOB system is not able to perform well when the fault modes happen. Hence, this study uses the MR damper to achieving FOOB under fault modes.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 춘계학술대회 논문집
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• pp.588-593
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• 2012

Nowadays, various forms of electro-optical rifle scope have been developed and used in order to enhance the accuracy of small arms. However, firing shock acceleration has characteristics of pyroshock having a big acceleration value with very short duration time, which the electro-optical scopes should be designed to sustain. In this paper, the firing shock acceleration, which is transmitted to the electro-optical scope, was measured and SRS (Shock Response Spectrum) analysis was performed by using the measured firing shock acceleration. Furthermore, a shock test condition using a drop-table shock tester, which can simulate the actual firing shock acceleration, was devised. The devised shock test condition will be utilized to test the electro-optical scope itself before attaching it to the small arms.

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

• 한국소음진동공학회논문집
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• 제18권7호
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• pp.764-774
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• 2008

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.

• 대한교통학회지
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• 제28권3호
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• pp.51-57
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• 2010

본 연구는 전국의 공항 인근지역에 있는 190여개 초 중 고등학교를 대상으로 항공기 소음의 피해 현황을 파악하고, 학교의 피해의식예측 모형을 수량화이론 II류를 이용하여 구축하였고, 피해학교 교사 1,012명의 설문을 통하여 교사들의 수업진행방해 예측모형을 구축하였으며, 특히 군용/민간 공용비행장 4개소와 사격연습장 1개소 총 5개 지역의 항공기 소음을 조사하여 그 특성을 분석하였다. 그 결과를 요약하면 다음과 같다. 군용/민간 공용 공항에서의 항공기 소음 WECPNL 5개 지역 모두 피해지역 제1종 지역과 2종 지역으로 나타나 항공기 소음에 심각한 문제가 있음을 알 수 있어 대책이 수립되어야 하겠다. 학교의 항공기 소음 피해의식 모형에서 가장 영향이 높은 요인은 공항과 학교와의 거리로서 5 Km 미만에서 양의 관계를 나타내며 10 Km 이상에서 음의 관계를 나타내고 있다. 항공기 소음의 폭로시간과 폭로회수가 각각 설명이 높으며 공항의 종류와 창문의 구조에도 깊은 영향이 있음을 알 수 있고, 본 예측모형은 상관비 0.56으로서 적합성이 높다고 하겠다.