• 제목/요약/키워드: 3-dimensional simulation analysis

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3차원 불연속변형해석법을 이용한 암반사면의 낙석과 전도 파괴 시뮬레이션 (Rockfall and Toppling Failure Simulation of Rock Slopes using 3-Dimensional Discontinuous Deformation Analysis)

  • 황재윤;오오니시 유조
    • 터널과지하공간
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    • 제22권3호
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    • pp.181-187
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    • 2012
  • 방재분야에서 컴퓨터 시뮬레이션 방법을 이용한 많은 연구는 재산 피해를 줄이고 인명을 구할 수 있다. 불연속변형해석법(DDA)은 불연속성 암반의 거동을 해석하기 위한 새로운 컴퓨터 시뮬레이션 방법이다. 현실적으로 대부분의 암반사면은 3차원적 문제이기 때문에 2차원 변형해석은 적용하는데 한계가 있다. 본 연구에서는 3차원 불연속변형해석법 관한 이론을 기술하였으며, 불연속성 암반에서의 컴퓨터 시뮬레이션 기법으로 새롭게 개발한 3차원 불연속변형해석법을 제안하고, 암반사면의 파괴 거동에 적용했다. 암반사면 현장에 적용하여 결과를 비교 검토함으로써, 암반사면의 변형과 파괴 메커니즘 해석에 있어서 개발한 3차원 불연속 변형 해석법의 적용성에 대한 검증을 하였다.

3차원 Bending Machine 설계에 관한 연구 (A Study on the Design of Three-Dimensional Bending Machine)

  • 이춘만;임상헌;박동근
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2003년도 추계학술대회
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    • pp.1852-1857
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    • 2003
  • This study is concerned about the development of three-dimensional bending machine for heat exchanger. Recently, three-dimensional bending is required for various heat exchanger. The purpose of this study is design of three-dimensional bending machine by analysis of bending process and structural analysis simulation. The analysis is carried out by FEM simulation using DEFORM and CATIA V5 software. The copper-tube is modeled by shell elements and the machine is modeled by placing proper shell and solid finite elements and fictitious mass properties to represent the real one. The final results of analysis are applied to the design of three-dimensional bending machine and the machine is successfully developed.

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마이크로 모터의 자동화된 FEA 시뮬레이션 (Automated FEA Simulation of Micro Motor)

  • Lee Joon-Seong
    • 한국시뮬레이션학회논문지
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    • 제11권3호
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    • pp.13-22
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    • 2002
  • This paper describes an automated evaluation of electrostatic field for micro motors whose sizes range 10 to 103um. Electric field modeling in micro motors has been generally restricted to in-plane two-dimensional finite element analysis (FEA). In this paper, the actual three-dimensional geometry of the micro motor is considered. An automatic FE mesh generation technique, which is based on the fuzzy knowledge processing and computational geometry techniques, is incorporated in the system, together with one of commercial FE analysis codes and one of commercial solid modelers. The system allows a geometry model of concern to be automatically converted to different FE models, depending on physical phenomena to be analyzed, electrostatic analysis and stress analysis and so on. The FE models are then exported to the FE analysis code, and then analyses are peformed. Then, analytical analysis and FE analysis about the torque generated by electrostatic micro motor are performed. The starting torque is proportional to $V^2$, the calculated starting torque from the two-dimensional analytical solutions are three times larger than those from the three-dimensional FE solutions.

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삼차원 프레스가공 시뮬레이션 기술을 활용한 수요가 가공공정 분석과 최적 재질선정 (Press forming severity analysis and selection of optimum sheet steel properties for customer lines by using 3-D simulation program.)

  • 박기철;한수식
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1996년도 자동차부품 제작기술의 진보
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    • pp.111-131
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    • 1996
  • In order to analyze stamping processes and to select optimum material properties of sheet steels for customer lines, 3-dimensional finite element analysis software were used. Commercial explicit finite element code, PAM-STAMP, was able to simulate 3-dimensional press formed parts with good accuracy and gave some useful results by orthogonal array experiments. Deformation of draw-bead were predicted by ABAQUS accurately, so that material selection for those parts by simulation were possible.

헛디딤 보행특성과 3 차원 모의해석결과 비교 (Comparison of Three-Dimensional Dynamic Simulation with Falling Gait Analysis)

  • 명성식;금영광;황성재;김한성;김영호
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2004년도 추계학술대회 논문집
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    • pp.359-363
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    • 2004
  • Numerous studies have been performed to analyze various phenomena of human's walking, gait. In the present study, unrecognized walking and recognized walking were analyzed by three dimensional motion capture system(VICON motion system Ltd., England) and simulated by computer program. Two normal males participated in measuring the motion of unrecognized and recognized walking. Six infrared cameras and four force plates were used and sixteen reflective markers were attached to the subject to capture the motion. A musculoskeletal model was generated anatomically by using ADAMS(MSC software corp., USA) and LifeMOD(Biomechanics Research Group Inc, USA). The inverse dynamic simulation and forward dynamic simulation were also performed. The result of simulation was similar to the experimental result. This study provides the base line for dynamic simulation of the falling walking. It will be useful to simulate various another pathologic gaits for old peoples.

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3차원 Bending Machine 설계 및 개발에 관한 연구 (A Study on the Design and Development of Three Dimensional Bending Machine)

  • 이춘만;임상헌;김현진
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2004년도 추계학술대회 논문집
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    • pp.1448-1451
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    • 2004
  • This study is concerned about the design and development of three dimensional bending machine. The purpose of this study is design and development of three-dimensional bending machine by analysis of bending process and structural analysis simulation. The analysis is carried out by FEM simulation using DEFORM and CATIA V5 software. Based on this study, the three dimensional bending machine was developed. In order to evaluate a performance and reliability of the developed three dimensional bending machine, we used laser interferometer and three axial measuring system.

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3차원 휠-레일 접촉해석을 이용한 철도차량 동역학 해석 (Railway vehicle dynamic analysis using an 3-dimensional wheel-rail contact analysis)

  • 강주석
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2010년도 춘계학술대회 논문집
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    • pp.18-24
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    • 2010
  • 철도차량의 동특성 해석을 위한 기존의 연구는 대부분 2차원 접촉해석에 근거한 근사해법에 의존해 왔다. 최근에 휠-접촉해석에 대한 정확한 해를 구하기 위해 3차원적 접근방법이 제시되고 있지만, 계산시간의 과다로 인해 실제 시뮬레이션 적용에는 효과적이지 못했다. 본 연구의 주요 관점은 효율적인 3차원 휠-레일 접촉 해석을 통해 휠-레일 접촉력을 계산하여 철도차량의 동특성 해석의 새로운 방법을 제시하고자 하는 것이다. 이를 통해, 3차원 휠-레일 접촉해석 및 휠셋의 동적 계산식이 제시된다.

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최소자승법과 Level-set 방법을 이용한 3차원 슬로싱 유동의 수치해석 (Numerical analysis of three-dimensional sloshing flow using least-square and level-set method)

  • 최형권
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회B
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    • pp.2401-2405
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    • 2008
  • In the present study, a three-dimensional least square/level set based two-phase flow code was developed for the simulation of three-dimensional sloshing problems using finite element discretization. The present method can be utilized for the analysis of a free surface flow problem in a complex geometry due to the feature of FEM. Since the finite element method is employed for the spatial discretization of governing equations, an unstructured mesh can be naturally adopted for the level set simulation of a free surface flow without an additional load for the code development except that solution methods of the hyperbolic type redistancing and advection equations of the level set function should be devised in order to give a bounded solution on the unstructured mesh. From the numerical experiments of the present study, it is shown that the proposed method is both robust and accurate for the simulation of three-dimensional sloshing problems.

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컴퓨터 시뮬레이션을 이용한 3차원적 구조에서의 저항 특성 분석에 관한 연구 (A study on Calculating the Resistance characteristics analysis on Three-Dimensional Structure Using Computer Simulation Method.)

  • 장우순
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2005년도 추계종합학술대회
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    • pp.683-686
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    • 2005
  • By now, we have been analysing the resistance values on 3 dimensional structure using experimental statical method or theoretical modeling, while devices miniaturizing reveals the limitation of the traditional methods to calculate 3 dimensional resistance. In addition, 2 dimensional analysing can not produce 3 dimensional characteristic following miniaturizing. To solve the limitations , we must do high level modeling of semi-conductor process. In this thesis, we analyzed the Laplace equation that is the basic and important for 3 dimensional structure resistance with computer simulation method and on the basis of this, analyzed the characteristic of resistance of 3 dimensional structure communication semiconductor device.

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Large Scale Gap 시험의 전산모사연구 (Study on the Computational Simulation of Large Scale Gap Test)

  • 이진성;박정수;이영신
    • 한국군사과학기술학회지
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    • 제14권5호
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    • pp.932-940
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    • 2011
  • This study describes computational simulation results in 2-dimensional and 3-dimensional space concerning large scale gap test(LSGT) by using commercial hydrocode such as AUTODYN and LS-DYNA to analyze the detonation phenomenons of high explosives. To consider the possibilities of LSGT simulation, we used Lee - Tarver reaction rate model of PBX-9404 and Comp-B which were implemented AUTODYN's material library. Also we have tried the diverse numerical schemes such as Lagrangian, Eulerian and ALE(Arbitary Lagrangian Eulerian), SPH(Smoothed Particle Hydrodynamics) in LSGT simulations. After LSGT simulations, we compared the simulation results with published results to verify the LSGT simulations. According to the LSGT simulations, we have concluded as follows. In 2-dimensional and 3-dimensional space, Lagrangian solver provided the most reliable results based on analysis time and accuracy. When using two hydrocodes in 2-dimensional space, the simulation results are almost same except one explosive model. We have verified the modeling method and simulation results of the LSGT by using the commenrcial hydrocode in this study.