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송기혁 ( Kee Hyeok Song ),강우람 ( Woo Ram Kang ),이덕주 ( Duck Joo Lee ),김영남 ( Young Nam Kim ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.4
A portable recoilless guided missile generates a strong back blast and impulsive noise at the nozzle when it launches. In the case of indoor operations, the hazard of the blast noise from a recoilless weapon increases due to limited indoor spaces. Also, the noise levels determine the operational feasibility of a weapon; therefore, it is important to predict the blast noise levels distribution in the indoor space in advance. In addition, computational fluid dynamics (CFD) method generally used for fluid related simulations, requires high computing cost and time to simulate the whole domains. The domain includes both blast wave region and large and various indoor space region. Therefore, an efficient method for predicting the far-field noise level within a short time should be developed. This paper describes an analysis model for predicting the indoor noise distributions by considering the shape effect of the building within a short time. A new developed blast wave model was implemented using the noise source. Additionally, noise reflections at the closed surfaces such as walls and noise transmissions at the opened surfaces such as windows and doors were considered in calculating the noise levels. The predicted noise levels were compared with the experimental data obtained from the indoor launch test to validate the reliability of program.
송기혁 ( Kee Hyeok Song ),강우람 ( Woo Ram Kang ),박종호 ( Jong Ho Park ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.2
Recoilless weapons, which lead strong back blast and impulse noise more than 160 dB, have been used in compliance with the regulation of the safety zone for the safe operations. However, the safety zone regulations for the newly developed weapons should be prepared since the existing guidelines do not provide any information concerning the reason for the safety zone. In this study, the outdoor launch tests were performed to collect the data such as noise, pressure and temperature of the back blast. An assessment method using data obtained from launch tests has been proposed to determine the safety zone. The safety zone has been determined with consideration for the following criteria: Impulse noise, temperature and pressure of the back blast and blast angle. As a results, new safety zones for them have been established for the recoilless weapon developed by ADD (Agency for Defense Development). We expect that this research can be used as a guideline for establishing a new safety zone regulation of similar weapon to be developed.
송기혁(Kee-Hyeok Song),정성학(Sung-Hak Chung) 한국컴퓨터정보학회 2014 韓國컴퓨터情報學會論文誌 Vol.19 No.6
본 연구의 목적은170dB 이상의 고충격 소음원에서 실내 충격소음을 측정 평가 할 수 있는 측정시스템 구축 방법을 제안하는데 있다. 이러한 목적을 달성하기 위하여 실내충격소음 측정시스템용 시험장을 설계 및 구현하고, 충격소음 측정용 마이크로폰, Head & Torso Simulator, Ear Simulator를 구성하였다. 충격소음 측정 시 정확한 측정을 위하여 3가지 측정방법을 동시에 측정할 수 있도록 구현하였으며, 정확성과 신뢰성을 위하여 3가지의 실내충격소음 측정값을 상호 비교하였다. 3가지 측정방법에 따른 최대 음압레벨과 옥타브 밴드 결과를 비교 분석함으로써 실내 충격소음의 주파수 특성에 따른 차이점을 확인하였다. 이러한 결과는 반사파의 영향에 의한 것으로 판단된다. 이에, 시험장의 크기를 변형하면서 측정할 수 있도록 실내 충격소음 측정시스템을 구현하였다. 본 시스템 구현을 통하여, 충격 소음원의 특징분석과 해당 주파수별 스펙트럼의 반사파 영향들을 파악할 수 있을 것이며, 향후, 실내 충격소음에 대한 데이터 획득 및 분석을 위하여 유용하게 활용될 수 있을 것으로 판단된다. The objective of this study is to propose the measurement system implementation method for the evaluation and measurement of the indoor-impulsive over 170 dB noise source. For the purpose of measuring impulse noise, design and implementation constructed followed subsystems of the testing center, microphone, ear simulator, head and torso simulator and so on. Measurement systems for the accuracy and reliability of impulse noise are implemented when measuring 3 ways of measurements method by the simultaneous measurement system design. For the accuracy and reliability of three mutually indoor-impulse noise measurements were compared, three kinds of measuring methods in accordance with the peak sound pressure level and octave band. Comparing the results of data, the indoor-impulse noise by analyzing a frequency characteristic was validated in difference for the statistical significance. Result are determined by the influence of the reflected wave. Therefore, the flexible size of the interior test site while interior impulse noise measurement system was constructed. Throughout this system can be affected by parameters that are the impulse noise source and the corresponding frequency-characteristic analysis to determine the spectrum of the reflected wave. And, in the near future, indoor impulse noise measurement systems for acquisition and analysis are utilized in useful data.
송기혁(Kee Hyeok Song),강우람(Woo Ram Kang),이덕주(Duck Joo Lee),공병학(Byung Hak Kong),이수갑(Soo Gab Lee),정성수(Sung Soo Jeong),박종호(Jong Ho Park) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.12
본 논문에서는 실내공간에서 발생하는 충격소음의 특성에 대해 연구되었다. 로켓추진장치가 분석을 위한 소음원으로 사용되었으며 동일 성능의 로켓추진기관을 가지고 실외와 실내에서 순차적으로 실험이 진행되었다. 실내실험의 경우 세 가지 실내 공간 크기(27, 35, 50 m3)에서 실험이 수행되었다. 실험 결과에 따르면 실외에 비해 실내에서 최고음압레벨(Peak sound pressure level)과 잔향시간이 크게 증가하였으며 주파수 분석을 통해 100 Hz이하 저주파 영역에서 모드주파수가 발생했음을 확인하였다. 실내공간 크기에 대한 모드주파수 분석 결과에 따르면 실험값이 이론값과 비슷함을 알 수 있었다. In this paper, the characteristics of impulsive sound pressure generated inside the building were studied. The rocket propulsion motors were used as a source of impact sound pressure and sound pressure was measured by using microphones, through launching test to analyze both outdoor and indoor noise characteristics. Indoor launching tests were carried out under three types of indoor size conditions: 27, 35, and 50 m3. According to the indoor launching test results, both peak sound pressure level and reverberation time were highly measured in comparison with the outdoor test cases. The frequencies of the fundamental mode existed in the low-frequency region, below 100 Hz, were found through frequency analysis. These results were well matched with calculated theoretical values.
공간크기에 따른 로켓모타 충격소음의 비교분석에 관한 연구
송기혁 ( Kee Hyeok Song ),정성학 ( Sung Hak Chung ),강우람 ( Woo Ram Kang ),이덕주 ( Duk Ju Lee ),박종호 ( Jong Ho Park ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.3
The purpose of this study is to analysis the 3 differential size of the interior space for impulse noise. To achieve this goal the 3 kinds (27, 35, 50 m3) of interior space were performed comparing the impulse noise. Result of this study, the standard error of the mean peak sound pressure of value from 0.19 to 0.27dB and there was no significant difference (p<0.01). And B-duration is significant differences (P<0.01) range from 3.98 to 7.93ms. This is respectively less than 10ms. These findings are confirmed in accordance by the 3 differential space size of the indoor-impulse noise due to 0.3 dB or less, so there was no difference to the operational influence. And also below 100 Hz were found fundamental mode frequency analysis. Results were matched with calculated theoretical values.
유도탄 사출시 연소 생성물의 인체 안전성 평가에 관한 연구
송기혁(Kee Hyeok Song),정성학(Sung Hak Chung) 한국산업경영시스템학회 2014 한국산업경영시스템학회지 Vol.37 No.4
The objective of this study is to safety assessment for human body on the guided missile combustion products. This study is to verify the safety assessment when operating the interior missile ejection take on verify the safety of the human body. During the missile ejection of combustion products, this study is analyzed combustion products. Result are accepted NIOSH and KOSHA of the safe guideline, and 6 exposure gas to the specified values 42% (CO), 22% (CO2), not detected (others) are within minimal exposures criteria of the reference value respectively. Contribution of these results supported that interior missile ejection during combustion products may have been ensured human safely. Therefore, the future for improving the environmental safety of the shooting projectile steel plate round, dust collector, ventilation and other facilities is to improve environmental safety and efficient renovated design needed by target focused areas.
정성학(Sung-Hak Chung),송기혁(Kee-Hyeok Song) 한국컴퓨터정보학회 2014 韓國컴퓨터情報學會論文誌 Vol.19 No.5
본 연구의 목적은 170 dB 수준의 충격 소음원에서 주파수별 귀마개의 차음성능을 확인하고, 주파수 특성과 패턴 형상을 분석하는데 있다. 충격 소음에서의 Combat Arm Earplug와 3M Form types 1100 Earplug의 주파수별 귀마개 차음성능을 산출하였다. 차음성능을 확인하기 위해서 B&K Head and Torso Simulator와 Ear Simulator를 제작하여 충격 소음원의 주파수별로 차음성능을 비교하였다. 기존의 연구들은 충격 소음원이라 할지라도 대부분 140 dB 수준의 고충격 소음원이였으나, 본 연구는 그보다 더 높은 수준의 충격 소음원이라는 특징을 가지고 있다. 연구결과, 주파수별 충격소음의 차음효과는 평균 28.58 dB 인 것으로 나타났다. The objective of this study is the frequency of the noise source 170 dB level of impulsive sound attenuation performance by earplugs to identify, to analyze the frequency characteristics of a shape and pattern. The attenuation performance of the impulsive noise by the frequency levels on the Combat Arm and 3M Form types 1100 Earplugs were evaluated. In order to check the sound attenuation performance of the B&K head and torso simulator and sound attenuation performance of the ear simulator data was verified. Previous studies have most impact, even in the noise source and the impulse noise level is 140 dB, but this study is higher than that of the impulsive noise source features. The results of the impulse noise attenuation effect is frequency-dependent mean 28.58 dB.