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RISS 인기검색어
- 검색키워드
- 주제어 : cone calorimeter experiment (검색결과 3 건)
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최적화기법을 이용한 철도차량 바닥재의 화염 열유속 및 방사율 예측
박원희,윤경범,Park. Won-Hee,Yoon. Kyung-Beom 한국방재학회 2014 한국방재학회논문집 Vol.14 No.3
철도차량 바닥재로 사용되는 합성 고무를 시편으로 하여 콘 칼로리미터 실험을 수행하고 시편의 표면온도, 발화시간 및 질량감소율을 측정하였다. 측정된 결과를 이용하여 임계열유속 및 발화온도를 산출하고, 반발 입자 군집 최적화 알고리즘을 이용하여 시편 표면에서의 화염에 의한 열유속을 예측하였다. 본 연구에서 최적화된 열유속을 이용하여 계산된 표면온도는 실험에서 측정한 표면 온도와 잘 일치하였다. 본 연구에서 제안한 화염에 의한 열유속을 구하는 방법은 철도차량의 화재 시뮬레이션의 신뢰성 확보에 유용한 도구로 활용될 수 있다. Surface temperatures, ignition times and mass loss rates of the synthetic rubber for railway vehicle flooring are measured for different external heat fluxes by the cone calorimeter. The flame heat flux on the surface can reach the better value by applying the repulsive particle swarm optimization algorithm. During optimization process the critical heat flux and ignition temperature are calculated using measured results. Finally we estimated the optimized flame heat flux. The calculated surface temperatures obtained by using optimized flame heat flux on the surface in this study are matched well with those from the test. The suggested process of determining flame heat flux proposed might be a very useful engineering method for ensuring the validity of a fire simulation for railway vehicles.
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Kyung-Beom Yoon,박원희,김태국 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.6
Data for the convection heat transfer coefficient and the surface emissivity of a matter are not easily available from the literature and are usually assumed to be constant values in most studies of pyrolysis. In this study the convection heat transfer coefficient and the surface emissivity of a specimen placed within a cone calorimeter under different external heat fluxes are estimated by using the statistical repulsive particle swarm optimization (RPSO) method. The transient surface temperature distribution of the specimen are measured from the cone calorimeter experiments for different external heat fluxes and these data are then used to determine the convection heat transfer coefficient and the surface emissivity of the specimen inversely. To check the accuracy of this method, we compared the measured temperature and the recalculated temperature of the specimen by using the estimated convection heat transfer coefficient and surface emissivity and we confirmed that they were fairly well matched with each other. We conclude that the proposed RPSO method of estimating the convection heat transfer coefficient and surface emissivity can be an alternative way of obtaining these data for various fire analyses.
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화재이론에 기초한 천장재 종류별 위험성 분석에 관한 연구
김혜원 ( Kim¸ Hyewon ),김윤성 ( Kim¸ Yunseong ),이병흔 ( Lee¸ Byeongheun ),진승현 ( Jin¸ Seunghyeon ),구인혁 ( Koo¸ Inhyuk ),권영진 ( Kwon¸ Youngjin ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
In general, when a building fire occurs, the heat flow rises by buoyancy, which affects the temperature rise of the ceiling. In addition, when the ceiling ignites, the fire spreads rapidly due to horizontal spread and radiant heat. According to the fire investigation, most of the large fires have a common characteristic that the fire spreads to the ceiling and causes many casualties. Therefore, it is considered that it is necessary to review the fire risk of ceiling materials used in buildings to prevent the spread of fire to the ceiling. Therefore, in this study, combustion characteristics such as the amount of heat released and ignition time of each SMC, DMC, and gypsum board were checked using a Cone Calorimeter, and the ignition temperature was calculated by substituting them into the fire theory. As a result, the ignition temperature of SMC was 449K, that of DMC was 1492K, and that of gypsum board was 677K.
ScienceON
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