• Title, Summary, Keyword: full scale fire test

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Full Scale Testing of the Effect of Stairwell Pressurization on Pressure Differential and Flow Velocity

  • Son, Bong-Sae;Park, Kyung-Hwan;Chang, Young-Bae
    • Journal of Korean Society of Hazard Mitigation
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    • v.11 no.3
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    • pp.83-89
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    • 2011
  • A series of full-scale testing was conducted to examine the effect of stairwell pressurization on the pressure differential between the stairwell and the auxiliary room and between the auxiliary room and the residence. Also, flow velocity profiles at open doors were measured. The building tested was a condominium that had twenty floors above the ground and two floors underground. For pressurization of the stairs, a blower was used to supply air into the stairwell at one location underground. Thirteen different cases were tested, and test variables included the number of floors with open doors and the flow rate of the air supply. When the doors on the first floor were open, the pressure differential between the stairwell and the auxiliary room was distributed almost uniformly except for locations near the first floor. When the flow rate was in the range of 180~270 CMM and the doors of one floor were open, the flow velocity could satisfy the requirement of fire safety standards and the stairwell pressure was positive at all levels. However, the minimum pressure requirement (10 Pa) could not always be satisfied. When doors on two floors were open, the flow velocity requirement could be satisfied by increasing the flow rate, but it was found impractical to satisfy the minimum pressure requirement without causing excessive pressure differential in the area near the blower.

Design, Manufacture and Test of Subscale Solid Rocket Motor with Pulse Separation Device (펄스분리장치를 적용한 소형 추진기관의 설계, 제작 및 시험평가)

  • Ryu, Jung-Hun;Lee, Won-Bok;Suh, Hyuk;Kim, Won-Hoon;Oh, Jong-Yun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.133-137
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    • 2010
  • A dual pulse solid rocket motor has several advantages compared to the single one. The range and the terminal velocity of the guided missile can be remarkably increased by the application of the pulse separation device(PSD) to the solid rocket motor which resulted in appropriate thrust distribution. In this study, the subscale dual pulse solid rocket motor with the bulkhead type PSD was designed, manufactured, and fire-tested. The bursting pressure, thermal characteristics, and the structural safety of the PSD were obtained by the tests and the results will be applied to the design of full-scale dual pulse rocket motor.

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Study on Work-Efficiency in feild of PFB(POSCO E&C Fire Board) for High Sterength Concrete Spalling Control (고강도 콘크리트 폭렬제어를 위한 PFB(POSCO E&C Fire Board) 공법의 현장 시공성에 관한 연구)

  • Kim, Woo-Jae;Park, Dong-Cheol;Yang, Wan-Hee;Lee, Sea-Hyun
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.961-964
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    • 2008
  • There are researches in progress on ensuring the safety of the high impact concrete in case of fire which is a current rising social problem and this research institute also developed PFB technology, the explosion preventing technology. PFB technology is to apply POSCO E&C Fire Board, a fireproof board, with an adhesive agent on the construction site, and this technology passed 3-hour fireproof test and this technology was proven from a previous research that the temperature of main root is maintained under $200^{\circ}C$. Therefore, tests on basic contents was performed in this research before the actual construction, with a full scale of wooden prototype to apply PFB technology to actual construction sites and the tests were done on the workability of fireproof board, the adhesive power, the resistance against imprint of wooden nail, the heat conductivity and etc. As the results of these tests, PFB technology was proven to have an excellent workability at a construction site and to be easy for processing and also, this technology was proven to have a great resisting power against imprint of wooden nail. Therefore, this research has confirmed that PFB technology has no problem to be applied on a construction site.

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A Study on the Application of Bushings Fire Prevent Structure to Prevent Fire Spread of Transformer (변압기의 화재확산 방지를 위한 부싱 방화구조체 적용에 관한 연구)

  • Kim, Do-Hyun;Cho, Nam-Wook;Yoon, Choung-Ho;Park, Pil-Yong;Park, Keun-Sung
    • Fire Science and Engineering
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    • v.31 no.5
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    • pp.53-62
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    • 2017
  • Electric power which is the energy source of economy and industries requires long distance transportation due to regional difference between its production and consumption, and it is supplied through the multi-loop transmission and distribution system. Prior to its actual use, electric power flows through several transformations by voltage transformers in substations depending on the characteristics of each usage, and a transformer has the structure consisting of the main body, winding wire, insulating oil and bushings. A transformer fire that breaks out in substations entails the primary damage that interrupts the power supply to houses and commercial facilities and causes various safety accidents as well as the secondary economic losses. It is considered that causes of such fire include the leak of insulating oil resulting from the destruction of bottom part of bushings, and the chain reaction of fire due to insulating oil that reaches its ignition point within 1 second. The smoke detector and automatic fire extinguishing system are established in order to minimize fire damage, but a difficulty in securing golden time for extinguishing fire due to delay in the operation of detector and release of gas from the extinguishing system has become a problem. Accordingly, this study was carried out according to needs of active mechanism to prevent the spread of fire and block the leak of insulating oil, in accordance with the importance of securing golden time in extinguishing a fire in its early stage. A bushings fireproof structure was developed by applying the high temperature shape retention materials, which are expanded by flame, and mechanical flame cutoff devices. The bushings fireproof structure was installed on the transformer model produced by applying the actual standards of bushings and flange, and the full scale fire test was carried out. It was confirmed that the bushings fireproof structure operated at accurate position and height within 3 seconds from the flame initiation. It is considered that it could block the spread of flame effectively in the event of actual transformer fire.

Heat Transfer Analysis and Experiments of Reinforced Concrete Slabs Using Galerkin Finite Element Method (Galerkin 유한요소법을 이용한 철근콘크리트 슬래브의 열전달해석 및 실험)

  • Han, Byung-Chan;Kim, Yun-Yong;Kwon, Young-Jin;Cho, Chang-Geun
    • Journal of the Korea Concrete Institute
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    • v.24 no.5
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    • pp.567-575
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    • 2012
  • A research was conducted to develop a 2-D nonlinear Galerkin finite element analysis of reinforced concrete structures subjected to high temperature with experiments. Algorithms for calculating the closed-form element stiffness for a triangular element with a fully populated material conductance are developed. The validity of the numerical model used in the program is established by comparing the prediction from the computer program with results from full-scale fire resistance tests. Details of fire resistance experiments carried out on reinforced concrete slabs, together with results, are presented. The results obtained from experimental test indicated in that the proposed numerical model and the implemented codes are accurate and reliable. The changes in thermal parameters are discussed from the point of view of changes of structure and chemical composition due to the high temperature exposure. The proposed numerical model takes into account time-varying thermal loads, convection and radiation affected heat fluctuation, and temperature-dependent material properties. Although, this study considered standard fire scenario for reinforced concrete slabs, other time versus temperature relationship can be easily incorporated.

An Estimation of the Temperature-dependent Thermal Conductivity for Hybrid-fiber Reinforced Shield Tunnel Lining (하이브리드 섬유보강 쉴드터널 라이닝의 온도의존적 열전도도 추정)

  • Lee, Chang Soo;Kim, Yong Hyok
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.16 no.4
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    • pp.99-106
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    • 2012
  • This study presents estimation method of temperature-dependent thermal conductivity by using solution of inverse heat conduction problem. Time and depth temperature distribution data from full-scale fire test were used for estimating temperature-dependent thermal conductivity on hybrid-fiber reinforced shield tunnel lining. At short heating time, estimated thermal conductivity sharply decreased within $100^{\circ}C$. On the other hand, it reflected thermal properties of concrete and effect of steel fiber at heating time of measured maximum heating temperature. Thus arbitrary time should be determined to estimate temperature-dependent thermal conductivity in time zone of measured maximum heating temperature. Estimated temperature-dependent thermal conductivity is similar to results of other study.

Small-Sample Inspection Plans for the New Product Quality Level Evaluation of Finite Population : Focused on Guided Weapons in Development Stage (생산수량이 한정된 신제품의 품질수준 평가를 위한 샘플링검사 방법 : 개발단계 유도무기를 중심으로)

  • Shin, Byung-Cheol;Byun, Jai-Hyun;Lee, Chang-Woo;Lee, Ki-Yong;Choi, Jong-Soo;Woo, Hee-Sung;Seo, Bo-Gil
    • Journal of Korean Institute of Industrial Engineers
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    • v.41 no.5
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    • pp.481-487
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    • 2015
  • In the product development stage, it is very important to ensure demanded quality level before moving to the full-scale manufacturing. For example, in developing guided weapons, live-fire tests are required to verify the final performance of the weapons which are very expensive. The quality evaluation of the guided weapons needs destructive testing, which makes it necessary to test as small number of samples as possible. This paper presents sampling inspection plans and calculating system for finite population guided weapons, which can meet the demanded quality level and confidence level with the minimum number of performance tests. The result of this paper can be useful for any kind of costly destructive testing.

Numerical Simulation of Crash Impact Test for Fuel Tank of Rotorcraft (회전익항공기용 연료탱크 충돌충격시험 수치모사 연구)

  • Kim, Hyun-Gi;Kim, Sung-Chan;Lee, Jong-Won;Hwang, In-Hee;Kim, Kyung-Soo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.24 no.5
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    • pp.521-530
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    • 2011
  • Since aircraft fuel tanks have many interfaces connected to the airframe as well as the fuel system, they have been considered as one of the system-dependent critical components. Crashworthy fuel tanks have been widely implemented to rotorcraft and rendered a great contribution for improving the survivability of crews and passengers. Since the embryonic stage of military rotorcraft history began, the US army has developed and practised a detailed military specification documenting the unique crashworthiness requirements for rotorcraft fuel tanks to prevent most, hopefully all, fatality due to post-crash fire. The mandatory crash impact test required by the relevant specification, MIL-DTL-27422D, has been recognized as a non-trivial mission and caused inevitable delay of a number of noticeable rotorcraft development programs such as that of V-22. The crash impact test itself takes a long-term preparation efforts together with costly fuel tank specimens. Thus a series of numerical simulations of the crash impact test with digital mock-ups is necessary even at the early design stage to minimize the possibility of trial-and-error with full-scale fuel tanks. In the present study the crash impact simulation of a few fuel tank configurations is conducted with the commercial package, Autodyn, and the resulting equivalent stresses and internal pressures are evaluated in detail to suggest a design improvement for the fuel tank configuration.

A Study on Configuration Optimization for Rotorcraft Fuel Cells based on Neural Network (인공신경망을 이용한 연료셀 형상 최적화 연구)

  • Kim, Hyun-Gi;Kim, Sung-Chan;Lee, Jong-Won;Hwang, In-Hee
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.25 no.1
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    • pp.51-56
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    • 2012
  • Crashworthy fuel cells have been widely implemented to rotorcraft and rendered a great contribution for improving the survivability of crews and passengers. Since the embryonic stage of military rotorcraft history began, the US army has developed and practised a detailed military specification documenting the unique crashworthiness requirements for rotorcraft fuel cells to prevent most fatality due to post-crash fire. Foreign manufacturers have followed their long term experience to develop their fuel cells, and have reflected the results of crash impact tests on the trial-and-error based design and manufacturing procedures. Since the crash impact test itself takes a long-term preparation efforts together with costly fuel cell specimens, a series of numerical simulations of the crash impact test with digital mock-ups is necessary even at the early design stage to minimize the possibility of trial-and-error with full-scale fuel cells. In the present study a number of numerical simulations on fuel cell crash impact tests are performed with a crash simulation software, Autodyn. The resulting equivalent stresses are further analysed to evaluate a number of appropriate design parameters and the artificial neural network and simulated annealing method are simultaneously implemented to optimize the crashworthy performance of fuel cells.