• Title, Summary, Keyword: Scaled model

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Development of a Dynamically Scaled Model of the Catenary for High Speed Railway (고속전철 가선계의 축소모델 개발에 관한 연구)

  • Kim, Jung-Soo
    • Journal of the Korean Society for Railway
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    • v.10 no.4
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    • pp.409-413
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    • 2007
  • A dynamically scaled model of the catenary with a nominal scaling factor of 18.5:1 is designed and constructed. The motivation for developing such a model is the great difficulty of making accurate measurements on the full-scale catenary and the difficulty of making experimental modifications to it. The scaled model is designed to be dynamically equivalent to the full scale catenary with respect to the mass and elastic strength. The scaled model is partially verified by comparing linear vibration and wave characteristics with those predicted by the simulation study.

Preliminary design of a scaled railway vehicle simulator (상사기법을 이용한 차량시뮬레이터 기초 설계)

  • Kim, Hong-Chan;Kim, Jeung-Tae;Lee, Hi-Sung;Oh, Se-Been
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.951-956
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    • 2008
  • The study is to develop a foundation design for a railway vehicle simulator using a scaled model. Although a scaled simulator is limited to manipulate the dynamics of a full-size railway vehicle, it has been known to have an advantage, since a scaled model could provide the fundamental dynamic behavior within a limited space of a laboratory facility and with a low operation cost while an experiment is conducted. This study is to propose a design strategy for a simulator so that a small scaled roller rig could be fabricated in a laboratory based on the design philosophy. The data obtained from the scale model is also experimentally investigated in conjunction with appropriate non-dimensional analysis so that the output results should be interpreted to the railway vehicle.

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Fragility Analysis of A Scaled Model of Reinforced Concrete Column in Accordance with Similitude Law (상사법칙이 적용된 철근콘크리트 기둥 축소모형의 지진 취약도 분석)

  • Park, Dong Uk;Jeon, Bub Gyu;Kim, Nam Sik;Park, Jamin;Cho, Jae-Yeol
    • Journal of the Earthquake Engineering Society of Korea
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    • v.21 no.2
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    • pp.87-93
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    • 2017
  • Many studies are conducted in several fields for fragility analysis of structures or elements which is a probabilistic seismic safety analysis in consideration with uncertainty of seismic loading. It is hard to directly conduct fragility analysis for an infrastructure with social importance due to its size. Therefore, a fragility analysis for an infrastructure mainly conducted in element level or conducted with scaled model built in accordance with similarity law. In this article, fragility analysis for prototype and scaled model of reinforced concrete column was conducted with numerical models which had been updated by the results of shaking table test and pseudo dynamic test. As a result, response stress from the numerical analysis result of prototype model was higher than that from scaled model due to different stiffness ratios between steel and concrete. However, the probability of failure for scaled model was higher than that for prototype model because failure criteria for scaled model was down due to similarity law. Also it was evaluated that probability of failure by using log normal standard deviation of response stresses by spectrum matched accelerograms was more reliable than probability of failure by using existing coefficient of variation normally used.

Performance Analysis of SSSC with Switching-level Simulation Model and Scaled Hardware Model

  • Han, Byung-Moon;Kim, Hee-Joong;Baek, Seung-Taek
    • Journal of Power Electronics
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    • v.1 no.1
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    • pp.48-55
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    • 2001
  • This paper describes a switching-level simulation model and scaled hardware model for SSSC, which is useful for analyzing the dynamic interaction between the SSC and the power transmission system. A detailed simulation model with EMTP was developed to verity the SSSC operation with control system, and its increasing capability of power transmission through the line for a typical one-machine infinite-bus system. The simulation results of the developed model are compared with the experimental results froma scaled model fo 2KVA rating for evaluation the whole system operation.

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A Study of Blasting Demolition by Scaled Model Test and PEC2D Analysis (축소모형실험 및 PFC2D해석에 따른 발파해체 거동분석)

  • 채희문;전석원
    • Tunnel and Underground Space
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    • v.14 no.1
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    • pp.54-68
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    • 2004
  • In this study, scaled model tests were performed on blasting demolition of reinforced concrete structures and the experimental results were analyzed in comparison with the results of numerical analysis. The tests were designed to induce a progressive collapse, and physical properties of the scaled model were determined using scale factors obtained ken dimension analysis. The scaled model structure was made of a mixture of plaster, sand and water at the ratio determined to yield the best scaled-down strength. Lead wire was used as a substitute for reinforcing bars. The scaled length was at the ratio of 1/10. Selecting the material and scaled factors was aimed at obtaining appropriately scaled-down strength. PFC2D (Particle Flow Code 2-Dimension) employing DEM (Distinct Element Method) was used for the numerical analysis. Blasting demolition of scaled 3-D plain concrete laymen structure was filmed and compared to results of numerical simulation. Despite the limits of 2-D simulation the resulting demolition behaviors were similar to each other. Based on the above experimental results in combination with bending test results of RC beam, numerical analysis was carried out to determine the blasting sequence and delay times. Scaled model test of RC structure resulted in remarkably similar collapse with the numerical results up to 900㎳ (mili-second).

Performance Analysis of TCSC by Experiment with Scaled Model (축소모형 실험에 의한 TCSC의 성능분석)

  • Han, B.M.;Kang, J.G.;Moon, S.I.;Kim, T.H.
    • Proceedings of the KIEE Conference
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    • pp.550-552
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    • 1997
  • This paper describes a detailed performance analysis of TCSC using experiment with a scaled model. A 3-phase scaled model of TCSC was built with rating of 2kVA to verify the operation. The variable reactance of TCSC with respect to the firing angle of thyristor switch analyzed theoretically and experimentally. And the limit of TCSC operation was investigated in whole range of the thyristor firing-angle. The experimental results with scaled model were compared with the simulation results for a periodic state space model using MATLAB.

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The Study on the Cooling Effects of the Atrium Interiors for the Roof Watering System by a Scaled Model (축소모형을 이용한 지붕담수시스템을 활용한 아트리움 실내의 냉각효과에 관한 연구)

  • Chung, Yu Gun
    • KIEAE Journal
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    • v.9 no.6
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    • pp.51-56
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    • 2009
  • The most important advantages of atrium buildings are to allow the abundant natural lighting and outside views. However, the abundant lighting frequently causes to increase a cooling load in summer. The roof watering systems are useful to reduce the cooling load and save the energy. This study aims to investigate the effects of the roof watering system in atrium through the scaled model experiments. For the study, the 1/20 scaled model was made and tests were performed under the clear sky conditions through August 24 to september 7 in 2008. The model size was $45{\times}45{\times}60(cm)$ and depth of roof water was 3(cm). As results, the thermal effects of two types of atrium(roof opening, and roof and front opening,) were evaluated through the experimental points and conditions. It is expected to use the results for the next research to develop the practical roof watering systems for atrium.

Wind Tunnel Test for Scaled Wind Turbine Model (Scale effect correction) (축소형 풍력터빈 풍동시험-축소효과 보상기법)

  • Cho, Tae-Hwan;Kim, Yang-Won;Park, Young-Min;Chang, Byeong-Hee
    • New & Renewable Energy
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    • v.4 no.2
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    • pp.87-93
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    • 2008
  • Wind tunnel test for the 12% scaled model of NREL Phase VI wind turbine was conducted in KARI low speed wind tunnel for $2006{\sim}2007$. The 1st and 2nd test was designed to find out the wind tunnel test method for the blade manufacturing accuracy and surface treatment method by using the composite and aluminum blades. And the 3rd test was designed to study the scale effect. The chord extension method which was used for Bo-105 40% scaled model was adapted for scale effect correction. Test results shows that the chord extension method works well for the torque slope but the maximum torque for scaled model is about 8% below than the real scale model. New correction method to correct this offset was proposed.

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A fundamental study on drag force of shield TBM cutter bit by scaled model test (축소모형실험을 통한 쉴드 TBM 커터비트의 절삭력 평가를 위한 기초 연구)

  • Kim, Sang-Hwan;Jang, In-Suk;Kim, Ji-Tae
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.14 no.3
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    • pp.277-292
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    • 2012
  • This paper presents the fundamental study on drag force of shield TBM cutter bit by scaled model test. Several theoretical analyses of the drag force of cutter bit have been studied. However, there are still some difference between the theoretical approaches and actual drag bit capacity. In order to study the drag forces of shield TBM cutter bit, the scaled model tests are carried out and analyzed. The results obtained from scaled model tests are compared with the existing theoretical equations. It is highly expected that the results of this study will be very essentially useful to design and develope the TBM cutterhead.

Development of Helicopter Chassis Dynamometer System for the Scaled Helicopter Ground Test (축소 헬기 지상시험을 위한 헬리콥터 섀시다이나모미터 개발)

  • Kim, Ick-Tae;Kim, Jae-Soo
    • Aerospace Engineering and Technology
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    • v.11 no.1
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    • pp.185-191
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    • 2012
  • This paper developed Helicopter Chassis Dynamometer System(HCDS) to perform the bench test of the scaled rotor blade and to design a scaled model helicopter flight test bed and accomplished the scaled helicopter ground test. The scaled helicopter should be checked the relation of thrust and power input to maintain regular RPM by collective pitch angle versus throttle input. It showed hovering performance results of IGE with OGE, the max. F.M. was 0.76 without ground effect. The results of the chassis dynamometer test of scaled helicopter will usefully apply to design the scaled helicopter and evaluate the rotor blade performance.