• Title/Summary/Keyword: 3D-FEM

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Fabrication and Characteristics Comparison of Piezoresistive Four Beam Silicon Accelerometer Based on Beam Location (빔 위치변화에 따른 4빔 압저항형 실리콘 가속도 센서의 제조 및 특성비교)

  • Shin, Hyun-Ok;Son, Seung-Hyun;Choi, Sie-Young
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.36D no.7
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    • pp.26-33
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    • 1999
  • In order to examine the effect of beam location n the performance of bridge type piozoresistive silicon accelerometer, three sensors having different location of beams were simulated by FEN(finite element method) and fabricated by RIE(reactive ion etching) and KOH etching method using SDB(silicon direct bonding) wafer, Results of the FEM simulation present that the 1st resonace frequency and Z axis sensitivity of each sensor are identical but the 2nd, and the 3rd resonace frequency and X, Y axis sensitivity are different. Even though the 1st resonance frequency and Z axis sensitivity measured from fabricated sensors do not perfectly coincide with each other, all 3 type sensors present 180 ~ 220N/G of Z sensitivity at 5 V supply voltage and 1.3 ~ 1.7kHz of the 1st resonance frequency and about 2% of lateral sensitivity.

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Field Pull-out Test and 3-D FEM Analysis for Steel Pipe Nailing Installed Foldable Wedge (접이식 웨지 장착 강관네일의 현장 인발시험 및 3차원 유한요소해석)

  • Kwon, Kyo-Keun;Choi, Bong-Hyuck
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.29 no.6C
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    • pp.313-319
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    • 2009
  • In this study, field pull-out test and 3-D FEM analysis have been performed for examining and reflecting the behavior of steel pipe nailing installed foldable wedge. Field pull-out test was performed under various conditions. As a result, the steel pipe nailing installed foldable wedge has an effect of pull-out resistance increased about 30% in comparison with non-wedge type steel pipe nailing. Through back analysis in 3-D FEM for behavior of non-wedge type steel pipe nailing, friction characteristics between nail to soil was analyzed and obtained first consistent with field pull-out behavior. Then, the frictional characteristic was used for analyzing the behavior of the steel pipe nailing installed foldable wedge. The result was compared with the test results. Consequently, friction coefficient (μ) of about 1.2 between grout to soil leads to good agreement with analysis results and test results. And a limited pull-out resistance, TL=32 tonf is similar to field pull-out test result which is improved about 33% in comparison with non-wedge type steel pipe nailing's TL=24 tonf.

Influence of Adjacent Structures using Numerical Method during funnel Blasting (터널발파굴착시 수치해석에 의한 구조물의 영향평가)

  • 김학문
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.4 no.3
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    • pp.274-278
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    • 2003
  • The numerical analysis indicated that the vibration response reduced sharply at the three times of tunnel diameter. Visual display of vibration response was possible through 3-D FEM computer program, and displacement of structure, particle velocity were obtained as output. It was found that the vibration velocity was maximum at distance one to two times of tunnel diameter for the given simplified blast loadings. The results of numerical analysis were compared with empirical based predictive equation of blasting. The empirical equation showed a good agreement with 3-D FEM results at a certain range of tunnel depth in this particular type of ground conditions.

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Optimal Design of Axial Type Brushless DC Motor Using 3-D FEM (3차원 유한요소법을 이용한 축방향 자속형 브러시리스 DC 전동기 최적 설계)

  • Hong, Sun-Ki
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.19 no.1
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    • pp.143-147
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    • 2005
  • In this paper, an axial type brushless DC motor which has double rotors using rare-earth magnet pieces is designed. This kind of motor has shorter axial length and is easier to assemble than the radial type motors. To get enough torque, NdFeB magnet is used and for the cost of production, the magnets are segmented to rectangle or disk shape. To design this motor, a equivalent circuit is adopted and the air-gap density is calculated using 3D finite element method to get exact parameters. The design variables are optimized with genetic algorithm. From the results of the simulations, the reference of the axial type BLDC motors can be obtained.

Parallel Processing of 3D Rigid-Plastic FEM on a Cluster System (클러스터 시스템에서 3차원 강소성 유한요소법의 병렬처리)

  • Choi Young;Seo Yongwie
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.1
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    • pp.122-129
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    • 2005
  • On the cluster system, the parallel code of rigid-plastic FEM has been developed. The cluster system, Simforge, has 15 processors and the total memory is 4.5GBytes. In the developed parallel code, the distributed data of the column-wise partitioned stiffness are stored as the compressed row storage and the diagonal preconditioned conjugate gradient solver is applied. The analysis of block upsetting is performed with the parallel code on Simforge cluster system. In this paper, the analysis results are compared and discussed.

Development of Transmitter/Receiver Front-End Module with Automatic Tx/Rx Switching Scheme for Retro-Reflective Beamforming

  • Cho, Young Seek
    • Journal of information and communication convergence engineering
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    • v.17 no.3
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    • pp.221-226
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    • 2019
  • In this work, a transmitter/receiver front-end module (T/R FEM) with an automatic Tx/Rx switching scheme for a 2.4 GHz microwave power transfer is developed for a retro-reflective beamforming scheme. Recently, research on wireless power transfer techniques has moved to wireless charging systems for mobile devices. Retro-reflective beamforming is a good candidate for tracking the spatial position of a mobile device to be charged. In Tx mode, the T/R FEM generates a minimum of 1 W. It also comprises an amplitude and phase monitoring port for transmitting RF power. In Rx mode, it passes an Rx pilot signal from a mobile device to a digital baseband subsystem to recognize the position of the mobile device. The insertion loss of the Rx signal path is 4.5 dB. The Tx and Rx modes are automatically switched by detecting the Tx input power. This T/R FEM is a design example of T/R FEMs for wireless charging systems based on a retro-reflective beamforming scheme.

Parametric Modeling Technique in OPERA-3d Preprocessor (OPERA-3d 전처리기에서의 변수화 모델링 기법)

  • Lim, In-Taek;Lee, Sang-Jin
    • Proceedings of the KIEE Conference
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    • 1998.07a
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    • pp.214-216
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    • 1998
  • Parameterizing a model is one of the most efficient ways of conducting "virtual prototying" i.e. exploring the "What if?" scenario. But it is very difficult to construct parameterized models in commercial based FEM programs, because they usually adopt the mouse inputs in their GUI, which cannot be parameterized. We consolidated a parametric modelling technique in OPERA-3d preprocessor, which is one of world leading electromagnetic analysis programs, by combining the mouse inputs in GUI with it's FORTRAN-based self script command language.

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Characteristic Analysis of Spoke Type Permanent Magnet Generator Considering the Rotor Overhang (오버행을 고려한 Spoke Type 영구자석 발전기의 특성 해석)

  • Kim K. C.;Kim K. W.;Lee S. M.
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.785-787
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    • 2004
  • The purpose of this paper is characteristic analysis of permanent magnet generator for AVR power of brushless synchronous generator. However, the PMG has a spoke type rotor with overhang, so we perform the analysis considering overhang for the precise airgap flux density. In this paper, dynamic analysis model with 2D FEM considering overhang is proposed by use of 2D, 3D static FEM results. The proposed method is verified by the results of PMG load test.

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Effect of Process Parameters on Cylindrical Open Die Forging (FEM을 이용한 원형 자유단조의 공정인자 영향에 관한 연구)

  • 최성기;김원태;천명식;문영훈
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.221-224
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    • 2003
  • In the open die forging process, it is difficult to optimize process parameters such as die shape, initial ingot size, feeding pitch, rotation angle and other process parameters in the operational environments. Therefore in this study, 3D finite element analysis has been performed to obtain optimal process condition for open die forging process. FEM analyses at various feeding pitches and rotation angles provide process conditions to make round bar having precise dimensional accuracy.

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