• Title/Summary/Keyword: Load Simulation

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Biaxial Compressive Deformation Characteristics of Round Aluminum Pipe (Al 원형관의 2축압축 변형특성에 관한 연구)

  • Yoo, C.K.;Kim, K.J.;Won, S.T.
    • Transactions of Materials Processing
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    • v.21 no.2
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    • pp.89-95
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    • 2012
  • To examine the deformation characteristics of round aluminum pipe under biaxial compression, a horizontal biaxial compression die was fabricated. The change of material properties, punch load and deformation behavior were monitored in experiments using various compressive deformation rates in the range of 1mm/min.~400mm/min. The tensile and compressive strains were estimated from Vickers microhardness results. The punch load and deformation characteristic of the round aluminum pipes were found to change greatly at a deformation rate of about 200mm/min. The punch load decreased with increasing compressive deformation rate. Results of numerical simulation using Deform-2D were in good agreement with experimental results, and the measured hardness variation with the strain variation was predicted well by the simulation.

A GUIDE FOR NUMERICAL WIND TUNNEL ANALYSIS IN ORDER TO PREDICT WIND LOAD ON A BUILDING (건축물의 풍하중을 예측하기 위한 수치풍동기법)

  • Lee, Mung-Sung;Lee, June-Hee;Hur, Nahm-Keon;Choi, Chang-Koon
    • 한국전산유체공학회:학술대회논문집
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    • 2010.05a
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    • pp.5-9
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    • 2010
  • A numerical wind tunnel simulation is performed in order to predict wind loads acting on a building. The aim of the present study is to suggest a guideline for the numerical wind tunnel analysis, which could provide more detail wind load distributions compared to the wind code and expensive wind tunnel experiments. To validate the present numerical simulation, wind-induced loads on a 6 m cube model is predicted. Atmospheric boundary layer is used as a inlet boundary condition. Various effect of numerical methods are investigated such as size of computational domain, grid density, turbulence model and discretization scheme. The appropriate procedure for the numerical wind tunnel analysis is suggested through the present study.

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An Analysis of Backward Extrusion Process with Torsion (비틀림을 이용한 후방압출 공정의 해석)

  • 허진혁;김영호;박재훈;진영은;이종헌
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.846-849
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    • 2000
  • In this paper backward extrusion process with lower die rotation was studied to improve the conventional backward extrusion problems ; requirement of large forming machine, the difficulty to selecting of die material caused by high surface pressure, high cost of forming machine caused by improvement of noise and vibration, and etc. In this experiment, model material, plasticine, was used of specimen. The result values of torsional and conventional backward extrusions were analyzed and compared. FE-simulation is used for analysis with DEFPRM-3D. These results show that the torsional backward extrusion is very useful process because this process can obtain the homogeneous deformation, low forming load. Decreasing forming load improves die life and makes it possible to use press of relatively low capacity. Also this process can reduce corner cavity, improve the initial cast-structure, owing to the high deformation and uniform starin distribution.

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A Study on the Simplified Controller for the Heavy-Load Traverse Driving System Using Performance Estimation Program (성능추정 프로그램을 이용한 대부하 선회구동/제어 시스템 단순화 연구)

  • Choi, Keun-Kuk;Lee, Man-Hyung
    • Journal of Institute of Control, Robotics and Systems
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    • v.6 no.4
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    • pp.261-267
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    • 2000
  • In this study, a heavy-load servo-control driving system, which are composed of controller, electro-hydraulic servomechanism, hydraulic motor, reduction gearbox, turret slew bearing and turret structure, are investigated to simplify the servo-control system. To estimate the effect of each component, nonlinear modeling and simulation are carried out. In the first stage, to prove the validity of the performance estimation program, simulation results are compared with experimental results. In the second stage, the effect of each component of the control system is evaluated and then a simplified control system is suggested.

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Study on Seismic Load Characteristics of Regulations and Integrity Evaluation of Wind Turbine (풍력발전기의 규정에 대한 지진 하중 특성 연구 및 건전성 평가)

  • Kim, Miseon;Kim, Jeonggi;Park, Sunho;Bang, Johyug;Chung, Chinwha
    • Journal of the Earthquake Engineering Society of Korea
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    • v.21 no.6
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    • pp.295-301
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    • 2017
  • This paper relates to the study of load characteristics applicable to wind turbine generators induced by earthquakes. An artificial design earthquake wave generated through the target spectrum and the envelope function of Richter Magnitude Scale (ML) 7.0 as in ASCE4-98 was created. A simulation of earthquake loads were performed according to the design load cases (DLC) 9.5~9.7 of GL guidelines. Additionally, simulation of seismic loads experienced by Wind Turbines installed in the Gyeongju region were carried out utilizing artificial earthquakes of ML 5.8 simulating the real earthquakes during the Gyeongju Earthquakes of Sept. 2016.

Load Flow Calculation and EMTP Simulation of AC/HVDC System (AC/HVDC 시스템의 조류계산 및 EMTP 시뮬레이션)

  • Kim, Jin-Ha;Chung, Gyo-Bum;Oh, Sung-Chul
    • Proceedings of the KIEE Conference
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    • 1997.11a
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    • pp.432-434
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    • 1997
  • In order to find the steady-state operating condition of HVDC system interacting with AC power system, the load flow calculation of AC/HVDC system is performed. For the calculation, each generating unit is modeled by an equivalent voltage source and coupled impedance. The rectifier station is modeled by a controlled DC voltage source. EMTP simulation of the AC/HVDC system is also performed to verify the result of the load flow calculation.

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Photovoltaic System Operation Optimal Technique Considering Climate Condition and Residential Loads Pattern (기후조건 및 실부하패턴을 고려한 태양광 시스템 최적 운전기법)

  • Moon, Hee-Sung;Choe, Gyu-Yeong;Kim, Jong-Soo;Lee, Yeong-Guk;Lee, Byoung-Kuk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.12
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    • pp.2385-2390
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    • 2009
  • Based on the detailed analysis of output characteristics of PV array and residential load usage pattern, a design method to calculate optimal battery capacity for stand-alone PV generation systems is proposed. And also, according to power flow Actual irradiation and temperature data are analyzed to compose a PV array simulator and also six representative home appliances are electrically modeled for load simulator, along with 24hours usage pattern. The surplus and insufficient power can be calculated from the proposed simulation platform, so that selection of an optimal battery capacity can be possible. The theoretical analysis and design process will be explained, along with informative simulation results.

Numerical study of wind load on the high-rise building (고층건물에 작용하는 풍하중에 관한 수치 해석적 연구)

  • Song, C.S.;Park, S.O.;Kim, D.W.;Ha, Y.C.
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03b
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    • pp.205-208
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    • 2008
  • The wind load on building surface is numerically investigated. The geometry of target building is a square cross section and aspect ratio (height (H) to width (d)) is 6. On building surface, the pressure was measured, compared to obtained value from numerical simulation. The numerical simulations were done using URANS with three different turbulence models such as v2-f model, k-${\omega}$model, and k-${\varepsilon}$ model, respectively. The v2-f model showed the best agreement with experimental data in simulating mean pressure coefficients on front, rear and side surface. But unsteady characteristics of pressure history measured on surface is shown a discrepancy between experiment and numerical simulation.

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A Study on Designing a Proper External Shading Device to Diminish the Cooling Load of a Transparent Glazing Office Building (투명 유리 사무소 건물의 냉방부하 감소를 위한 적정 외부차양 배치에 관한연구)

  • Yim, Sang-Joon;Seo, Hye-Soo;Kim, Byung-Seon
    • KIEAE Journal
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    • v.2 no.4
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    • pp.21-26
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    • 2002
  • Modem architecture represent a great capitalistic, polishing, high-technology image to the public by design. As a result, glass architecture which show 'transmittance' in desinging play a leading part, consequently a role of machine is increasing in controlling an internal environment of building. These movement look like assisting an universal standard building disregarding a each nation's climate peculiarity, if glass building is applied by a proper external shading device. the shading device has a great effect on the reduction of cooling load energy, this research to propose the proper designing scheme of the fixed external shading device. The effect of proper external shading device on the cooling load is evaluated by the numeric simulation.

The Study on Control System Simplification of Underdevelop ing Heavy-Load Driving System Using Developed Performance-estimation program (대부하 구동/제어 시스템 성능추정 프로그램을 이용한 제어시스템 단순화 연구)

  • 최근국;이만형;윤강섭
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.999-1003
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    • 1996
  • In this study, underdeveloping heavy-load driving servo control system, which are composed of controller, electro-hydraulic servo-valve, hydraulic motor, reduction gear box, turret slew bearing and turret structure, are investigated to simplify the control system. To estimate the effect of each component, model ins and simulation of linear and nonlinear system are carried out. In the first stage, to prove the retiability of performance estimation pro-gram, simulation results are compared with experimental results. In the second stage, the effect of each component of control system is evaluated and then a simplified control system is suggested.

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