• 제목/요약/키워드: Experimental verification

검색결과 1,663건 처리시간 0.025초

유동해석에 의한 연료전지용 수소 재순환 블로워 개발 (Development of Hydrogen Recirculation Blower for Fuel Cell Vehicle by Flow Analysis)

  • 심창열;홍창욱;김영수
    • 유체기계공업학회:학술대회논문집
    • /
    • 유체기계공업학회 2005년도 연구개발 발표회 논문집
    • /
    • pp.684-689
    • /
    • 2005
  • Parametric calculation were conducted to estimate performance of variable geometry of hydrogen recirculation blower for fuel cell vehicle. The pressure rise and efficiency are effected by change of the geometric parameter of impeller and casing, and stripper clearance under various mass flow. Hydrodynamic performance were evaluated, and also the inner flow fields were investigated by CFD. Calculated results show good coincidence with experimental test results of total pressure performance. Performance of model designed by parametric calculations satisfied experimental data of verification model.

  • PDF

전산해석을 통한 열증기압축기 설계와 실험적 검증 (Design of Thermal Vapor Compressor by Numerical Analysis and Experimental Verification)

  • 박일석;박상민;하지수
    • 한국유체기계학회 논문집
    • /
    • 제8권6호
    • /
    • pp.33-39
    • /
    • 2005
  • A thermal vapor compressor in which the subsonic/supersonic flow appears simultaneously, has been accurately designed through the CFD analysis for the various shape parameters such as the primary nozzle shape, converging duct shape, mixing tube diameter, and so on. The performance of the developed thermal vapor compressor has been experimentally verified to be installed in a Multi Effect Desalination(MED) plant as an important element. In this paper, the effects of each parameter are discussed on the basis of CFD results and the experimental results for various boundary conditions(motive pressure, suction pressure, and discharge pressure) are presented in compared with CFD results. The two results show a good agreement with each other within 2 % accuracy with regard to the entrainment ratio.

등가 드로비드 모델의 실험적 검증 및 차체 스탬핑 해석에 적용 (Experimental Verification of Equivalent Drawbead Model and Application to Auto-Body Stamping Analysis)

  • 문성준;이자연;금영탁
    • 소성∙가공
    • /
    • 제18권5호
    • /
    • pp.371-376
    • /
    • 2009
  • An equivalent drawbead model(EDM) for sheet metal forming analysis, which replaces complex drawbead geometries with drawbead forces in modeling the stamping dies with finite elements, is experimentally verified and applied to the numerical simulation of auto-panel stamping process. The drawbead restraining and opening forces of elliptical drawbead, circular drawbead, square drawbead, and step drawbead are obtained by performing the drawbead pulling test and compared with those of EDM and commercial code models(CCM). Better agreement with experimental measurements is found in EDM than CCM. Furthermore, the excellence of EDM is demonstrated in its application to the auto-body stamping analysis.

유한요소법에 의한 흡음재 음향특성 연구 및 검증 (Finite Element analysis of Acoustic Behavior of Absorbent Materials with experimental Verification)

  • 정환익;김관주;박진규;김상헌
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2003년도 추계학술대회논문집
    • /
    • pp.874-878
    • /
    • 2003
  • Acoustic materials are used for the purpose of absorbing noise and reducing transmission of sound into the receiving room. The purpose of this research is to predict the performance of absorbent materials with respect to absorbing behavior and transmission loss as possible as accurately. The performance of the absorbent materials are carried out systematically as follows: The Biot parameter are measured, first. Then using above parameters as input, LMS's SYSNOISE and VIOLINS programs are used to predict absorption coefficient and transmission loss values, which magnitudes are compared with experimental results. As an sample acoustic material, SK SKY VIVA and PET are selected.

  • PDF

나노 인덴테이션 공정의 유한요소해석 및 실험적 검증 (Finite Element Analysis of Nanoindentation Process and its Experimental Verification)

  • 이정우;윤성원;강충길
    • 소성∙가공
    • /
    • 제12권4호
    • /
    • pp.382-387
    • /
    • 2003
  • In this study, to achieve the optimal conditions for mechanical hyper-fine pattern fabrication process, deformation behaviors of the materials during indentation were studied with numerical method by ABAQUS S/W. Brittle materials (Si, Pyrex glass 7740) were used as specimens, and forming conditions to reduce the elastic recovery and pile-up were proposed. The indenter was modeled a rigid surface. Minimum mesh sizes of specimens are 1-10nm. Comparisons between the experimental data and numerical result demonstrated that the finite element approach is capable of reproducing the loading-unloading behavior of a nanoindentation test.

이동질량에 의한 탄성 지지된 보의 동적응답 실험 (Experiments on Dynamic Response of an Elastically Restrained Beam under a Moving Mass)

  • 이종원;류봉조;이규섭;김효준
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2003년도 춘계학술대회논문집
    • /
    • pp.275-280
    • /
    • 2003
  • This paper discusses on the dynamic responsed of an elastically restrained beam under a moving mass of constant velocity. Governing equations of motion taking into account of all inertia effects of the moving mass were derived by Galerkin's mode summation method, and Runge-Kutta integration method was applied to solve the differential equations. Numerical solutions for dynamic deflections of beams were obtained for the changes of the various parameters (spring stiffness, spring position, mass ratios and velocity ratios of the moving mass). In order to verify the numerical predictions for the dynamic response of the beam, experiments were conducted. Numerical solutions for the dynamic responses of the test beam have a good agreement with experimental ones.

  • PDF

SUV차량의 Idle 성능 개발 (Idle Vibration Development Procedure of 4WD SUV)

  • 최승우;이남영
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2003년도 춘계학술대회논문집
    • /
    • pp.120-124
    • /
    • 2003
  • NVH issue at idle condition is one of the major concerns of Passenger and Commercial Vehicle including Sports Utility Vehicle Especially steering wheel vibration at idle condition is a very complex problem and affected by firing frequency of the engine, stiffness of a steering wheel system and the body to which the steering wheel system is attached. To avoid vibration mode coupling between each system of a vehicle, experimental and analytical method has been used at the pre-prototype stage. The resonance frequency of the body and the frame has been decoupled by CAE and the resonance frequency of steering wheel system has been set in between the 1st bending frequency of body and frame. These Results has been used as design guidelines tot the prototype drawing stage. The experimental verification of tile modified pre-prototype vehicle shows good results of the vibration mode decouple. Modal test of prototype vehicle also confirms the vibration mode decouple between each system.

  • PDF

도로포장구조체의 제설 특성에 관한 실험적 연구(1) (The experimental study for the characteristice of snow removal on the Pavement structure (1))

  • 조병환;황정영;태기호
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 1997년도 봄 학술발표회 논문집
    • /
    • pp.663-668
    • /
    • 1997
  • In Korea, the temperature of winter seasons are really severe and cause lot's of snow-falling and iceing in the pavements. Several de-iceing mehtod have generally been adopted to melt the ice on the surface of pavement. Therefore, the Study of experimental in the first stage was given to the verification of the icers's effects. First, Contrete and asphalt pavement specimens were made and scattered with a CaC2-deicers. then 3cm and 5cm thickness of artificial snow were prepared on the surface of specimens. It reveals that the early calorification due to de- icers as high as the temperature of laboratory increases within about 10 minutes and last for more then 2 hours and the test of ice-formation on the surface of contrete and asphalt specimen due to snow leads to the similar rate of freezing time about 20 minutes. Second, three kinds of de-icers, such as CaC2 CaC2+Nacl, Cacl Flaket are rested in the snowy highway to check the iceing-resistance. The CaC2 is proved to be the most effective de-icers so far.

  • PDF

Real-Time Implementation of On-Line Trained Neuro-Controller for a BLDC Motor

  • Salem, M.M.;Zahran, M.B.;Atia, Yousry;Zaki, A.M.
    • Journal of Power Electronics
    • /
    • 제3권1호
    • /
    • pp.10-16
    • /
    • 2003
  • Implementation and experimental verification of a simple neuro-controller (SNC) as a speed controller for a brush less DC (BLDC) motor is presented. The SNC with one weight and a linear hard limit activation function is trained on-line using the back propagation algorithm. A modified error function is used to ensure good performance during the on-line training, which has been used without previous off-line training. The SNC has been implemented using a computer-interface card mounted on a PC. The driving system performance has been investigated by a number of experimental tests for a variety of input reference speed trajectories.

Upwind Navier-Stokes 방법을 이용한 진동하는 익형 주위의 비정상 천음속 유동해석 (Unsteady Transonic Flow Analysis over an Oscillatory Airfoil using upwind Navier-Stokes Method)

  • 오태훈;김상덕;송동주
    • 한국전산유체공학회:학술대회논문집
    • /
    • 한국전산유체공학회 1999년도 춘계 학술대회논문집
    • /
    • pp.137-143
    • /
    • 1999
  • The unsteady transonic viscous flow has been analyzed over an oscillatory airfoil. The CSCM(Conservative Supra Characteristic Method) upwind flux difference splitting method and the iterative time marching scheme having first order accuracy in time and second to third order accuracy in space was applied on dynamic meshes. A steady flow field of Mach number 0.7 has been calculated for the verification of unsteady algorithm. The time-accurate unsteady calculations have been done for NACA 0012 airfoil oscillating around quarter chord about freestream Mach number 0.6 on dynamic meshes. The results have been compared with the AGARD Case 3 experimental data. The periodic characteristics have been compared with the experimental results.

  • PDF