• 제목/요약/키워드: Experiment of Full-Scale Model

검색결과 88건 처리시간 0.024초

PSALI 연구를 위한 실물대 실험 장치와 축소 모형간의 유의성 검증 (Verification of Significancebetween Experiment Devices and Scaled-down Model for the Study of PSALI)

  • 이진숙;김소연;하태현;정용규
    • 조명전기설비학회논문지
    • /
    • 제25권12호
    • /
    • pp.11-20
    • /
    • 2011
  • PSALI is referred to the supplementary lighting for the interior lighting under the daily lighting situation, and pursuant to the pertinent regulations in energy savings design standard and others in recent architecture works, the importance thereof has been increasing gradually coupled with the energy performance index (EPI), energy savings plan and the like as well as expansion of submittal and implementation policies. However, this type of PSALI studies indeed have a number of limitations since it has surrounding environmental conditions in direction, season, region, climate, time, opening rate, window area ratio, actual index, reflection rate of finishing materials and others in the architecture work as well as frequent changes in interior lighting environment for variables in daily light volume flowing into the interior, and others. Therefore, this study has analyzed existing advance research cases to produce the actual-sized model and scaled-down model, and installed the artificial lighting of LED light source possible to reproduce with same capability on both models. As a result of comparison and analysis of the artificial lighting with the key light, it has certain level of error rate from the scaled down lighting device in certain rate and actual model butit was noticeably significant within specific scope.

에너지 흡수용 알루미늄 허니컴 재료의 압축거동 분석 및 설계 (An Analysis of Axial Crushing Behavior of Energy Absorbing Aluminum Honeycomb and Design of Cell Configuration)

  • 김중재;김상범;김헌영
    • 한국자동차공학회논문집
    • /
    • 제9권5호
    • /
    • pp.195-205
    • /
    • 2001
  • The mechanical properties of aluminum honeycomb on the direction of axial crushing under quasistatic loading test was investigated. The crushing process was simulated numerically by full-scale finite element models. Simulations reproduce the experimental results both qualitatively as well as quantitatively. From the investigation, we suggested the constitutive model of energy absorbing honeycomb structure for large scale impact analysis. Real impact test of the WB(Moving Deformable Barrier) was carried and compared with finite element simulation. Constitutive model used in the numerical simulation had a good correlation with experiment. By suggesting the optimizing method fur honeycomb cell configuration design, relationship between cell configuration and crush strength is studied.

  • PDF

미국과 유럽의 풍력터빈 풍동실험 (Wind tunnel test of wind turbine in United States and Europe)

  • 장병희
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 한국신재생에너지학회 2005년도 춘계학술대회
    • /
    • pp.42-46
    • /
    • 2005
  • In spite of fast growing of prediction codes, there is still not negligible uncertainty in their results. This uncertainty affects on the turbine structural design and power production prediction. With the growing size of wind turbine, reducing this uncertainty is becoming one of critical issues for high performance and efficient wind turbine design. In this respect, there are international efforts to evaluate and tune prediction codes of wind turbine. As the reference data for this purpose, field test data is not appropriate because of its uncontrollable wind characteristics and its inherent uncertainty. Wind tunnel can provide controllable wind. For this reason, NREL has done the full scale test of the 10m turbine at NASA-Ames. With this reference data, a blind comparison has been done with participation of 18 organizations with 19 modeling tools. The results were not favorable. In Europe, a similar project is going on. Nine organizations from five countries are participating in the MEXICO project to do full scale wind tunnel tests and calculation with prediction codes. In this study. these two projects were reviewed in respect of wind tunnel test and its contribution. As a conclusion, it is suggested that scale model wind tunnel tests can be a complementary tool to calculation codes which were evaluated worse than expected.

  • PDF

ZONE MODEL을 이용한 아파트에서의 화재 해석 (Analysis of a Fire in an Apartment Building Using a Zone Model)

  • 박진국;김충익;유홍선;윤명오
    • 한국화재소방학회논문지
    • /
    • 제11권2호
    • /
    • pp.25-33
    • /
    • 1997
  • 화재 위험성올 조사하기위해 우리나라의 주거형태에서 가장 보편적인 공동주태을 사용하여 실물 화 재실험을 하였다. 화재 실험에서는 우리나라의 실제 생활에 사용되는 가구와 가연성물질풍을 사용하여 우리나라의 현실에 적합한 화재 위험성을 명가해 보았다. 이 실험에서 얻은 결과를 C-FAST라는 해석 모텔올 사용하여 얻은 예측치와 비교하였다. C-F AST의 제한성때문에 거실에서 발생한 화재에 대해서 만 결과를 비교해보았다. 실물 화재실험에서는 flash-over가 약 380초 경에 Zone-Model에서는 약 420 초 경에 발생하는 것으로 예측되었다. 그 외의 모든 실험 결과와 예측 결과에 의해 피난시간을 도출하 면 화재 실험과 Zone-Model 모두에서 250초 이내에 피난해야 한다는 결론을 얻었다.

  • PDF

소형탈선시뮬레이터를 이용한 1/5 축소대차의 주행안정성 시험 (A Running Stability Test of 1/5 Scaled Bogie Using Small Scale Derailment Simulator)

  • 엄범규;이세용;이영엽;강부병;이희성
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
    • /
    • pp.2600-2608
    • /
    • 2011
  • The dynamic stability of railway vehicle has been one of the important issues in railway safety. The dynamic simulator has been used in the study about the dynamic stability of railway vehicle and wheel/rail interface. Especially, a small scale simulator has been widely used in the fundamental study in the laboratory instead of full scale roller rig which is not cost effective and inconvenient to achieve diverse design parameters. But the technique for the design of the small scale simulator for the fundamental study about the dynamic characteristics of the wheel-rail system and the bogie system has not been well developed in Korea. Therefore, the research about the development of the small scale simulator and the bogie has been conducted. As this paper, To predict the dynamic behavior of railway vehicle, we studied running stability test of 1/5 scaled bogie that similarity laws is applied using small scale derailment simulator. For the operation of the small scale derailment simulator, it is required to investigate the performance and characteristics of the system. This could be achieved by a comparative study between an analysis and an experiment. This paper presented the analytical model which could be used for verifying of the test results and understanding of the physical behavior of the dynamic system comprising the small scale bogie and the simulator.

  • PDF

발코니 길이변화에 의한 화염분출성상의 실험적 고찰 (Experimental Study of the Blowoff Flame Phenomena Due to Changes of Balcony Length)

  • 김회천;손장열;박형주
    • 설비공학논문집
    • /
    • 제19권3호
    • /
    • pp.235-244
    • /
    • 2007
  • In the case of the fire outburst within a partitioned space, it can disappear inside it through smoldering process if the fire cannot obtain sufficient imflammability. On the contrary, if it obtains it, the fire is not restricted within the room, spreading to the higher levels beyond outside windows and the compartment room. The method to prevent the fire spread through windows is considered to build a balcony or equip with sprinkler facilities. This case study is to identify which effects and controlibility a balcony brings about on the spread of fire through a full scale model experiment. In order to understand the effects of fire spread on the upper levels of the room on fire by changing the length of balcony, the temperature was measured, radiant heat was investigated, and products of combustion were analyzed. The result showed that when fire occured, longer length of the balcony, which linked to the outside wall of the apartments, led to the blocking of the fire spread, lower level of radiant heat, and significantly less transfer of toxic gases, and the driving force of the outburst of flame was identified as the attractive force due to the turbulence of uncombusted gases, which exist on the upper level of the outbursting flame.

Finite-element modeling of a light-framed wood roof structure

  • Jacklin, Ryan B.;El Damatty, Ashraf A.;Dessouki, Ahmed A.
    • Wind and Structures
    • /
    • 제19권6호
    • /
    • pp.603-621
    • /
    • 2014
  • Past high speed wind events have exposed the vulnerability of the roof systems of existing light-framed wood structures to uplift loading, contributing greatly to economic and human loss. This paper further investigates the behaviour of light-framed wood structures under the uplift loading of a realistic pressure distribution. A three-dimensional finite-element model is first developed to capture the behaviour of a recently completed full-scale experiment. After describing the components used to develop the numerical model, a comparison between the numerical prediction and experimental results in terms of the deflected shape at the roof-to-wall connections is presented to gain confidence in the numerical model. The model is then used to analyze the behaviour of the truss system under realistic and equivalent uniform pressure distributions and to perform an assessment of the use of the tributary area method to calculate the withdrawal force acting on the roof-to-wall connections.

3D 직교 직물 복합재료 평판의 미시구조를 고려한 손상 거동 연구 (A Study of damage behaviors of 3D orthogonal woven composite plates under Low velocity Impact)

  • 지국현;양정식;김승조
    • 한국복합재료학회:학술대회논문집
    • /
    • 한국복합재료학회 2005년도 추계학술발표대회 논문집
    • /
    • pp.53-56
    • /
    • 2005
  • In this study, the material characterization and the dynamic behavior of 3D orthogonal woven composite materials has been studied under transverse central low-velocity impact condition by means of the micromechanical model using finite elements. To build up the micromechanical model considering tow spacing and waviness, an accurate unit structure is stacked in x-y-z direction repeatedly. First, the mechanical properties of 3D orthogonal woven composites arc obtained by means of virtual experiment using full scale Finite Element Analysis based on the DNS concepts, and the computed elastic properties arc validated by comparison to available experimental results. Second, using the implementation of this validated micromechanical model, 3D transient finite-clement analysis is performed considering contact and impact, and the impact behavior of 3D orthogonal woven composite is investigated. A comparison study with the homogenized model will be carried out in terms of global and local behaviors.

  • PDF

Multi-Domain과 행렬 보간법을 이용한 강 하구와 연안의 2차원 수치해석 (Numerical Simulation of 2-D Estuaries and Coast by Multi-Domain and the Interpolating Matrix Method)

  • 채현식
    • 한국전산유체공학회지
    • /
    • 제2권1호
    • /
    • pp.21-28
    • /
    • 1997
  • This paper presents a two-dimensional horizontal implicit model to general circulation in estuaries and coastal seas. The model is developed in non-orthogonal curvilinear coordinates system, using the Interpolating Matrix Method (IMM), in combination with a technique of multi-domain. In the propose model, the Saint-Venant equations are solved by a splitting-up technique, in the successive steps; convection, diffusion and wave propagation. The ability of the proposed model to deal with full scale nature is illustrated by the interpretation of a dye-tracing experiment in the Gironde estuary.

  • PDF

제주도 주변해엽 고등어 포착망의 연구 - 1 . 정수에 있어서 망형 변화에 관한 모형실험 - (Studies on the Mackerel Purse Seine Operation in the Sea Area of Cheju Island - 1 . Model Experiment on the Changes of Net Shape in Stagnant Water -)

  • 박정식
    • 수산해양기술연구
    • /
    • 제22권2호
    • /
    • pp.7-15
    • /
    • 1986
  • In order to investigate the performance for the mackerel purse seine of one boat purse seiner using in the sea area of Cheju Island, a model net is made of the scale of 1/400 of its full scale, and model test on the shape of net and the tension of purse line is carried out in the stagnant water channel of the circulating water tank. Designing and testing for the model net are based on the Tauti's law. The obtained results are as follows; 1. The sinking rate of net is maximized the value of 6.40 m/min from 5 to 10 minutes after shooting net, and the mean value is 6.13 m/min. 2. The enclosed area formed with the float line after pursing operation is 76-84% of the area which is formed immediately after the shooting operation. At that time, purse seine is pulled inward the circle of surrounding net about 26.5% of the diameter. 3. In operating, when longitudinal section area of the central part of the net is maximized, the split area of both the wing-ends is 31-32% of the former. 4. When the time for the completing of pursing is 20 minutes, the maximum tension of the purse line is about 10.2 tons.

  • PDF