• Title/Summary/Keyword: 3D-FEM

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Microcomputer FEM Analysis of Soil Cutting Process

  • Shen, J.;Kushwaha, R.L.
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 1993.10a
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    • pp.1063-1072
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    • 1993
  • Current finite element analysis programs for soil cutting process with tillage tools require mainframe computers. Several special treatments in developing a microcomputer FEM program were introduced to increase the capacity for solving large problems and reducing the total time cost. The program was evaluated by solving one 3-D example on a 489 microcomputer. The results showed a close agreement with the laboratory soil bin test.

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Estimation of Effective Coil Length of Superconducting Generator using 3D FEM

  • Shin, Pan-Seok;Park, Doh-Young
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.12B no.1
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    • pp.7-12
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    • 2002
  • This paper presents a method to estimate an effective length of a 1000-kVA superconducting generator using three-dimensional FE analysis. Flux linkage of stator coil and the induced voltage are calculated with FEM program and Faraday's law. An effective length of the stator coil is estimated using the calculated voltage and geometric configurationn of the machine. In order to verify the estimation method, 30-kVA superconducting generator is built and tested. The test result agrees reasonably well with the estimation.

The Study of Dynamic Characteristic of PMLSM According to Variable Load (영구자석형 선형 동기 전동기의 가변부하에 따른 동특성 해석)

  • Lee, Seung-Hoon;Jang, Ki-Bong;Kim, Gyu-Tak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.4
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    • pp.596-602
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    • 2008
  • This paper presents the dynamic characteristic analysis of Permanent Magnet Linear Synchronous Motor(PMLSM) according to variable load. In order to analyze dynamic characteristics, finite element method(FEM) was used for calculation of the parameter and the Matlab simulink was used for dynamic characteristic simulation. The measuring system of the dynamic characteristics was manufactured and the experiment results were compared with the simulation results.

Design of an Integrated Inductor with Magnetic Core for Micro-Converter DC-DC Application

  • Dhahri, Yassin;Ghedira, Sami;Besbes, Kamel
    • Transactions on Electrical and Electronic Materials
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    • v.17 no.6
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    • pp.369-374
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    • 2016
  • This paper presents a design procedure of an integrated inductor with a magnetic core for power converters. This procedure considerably reduces design time and effort. The proposed design procedure is verified by the development of an inductor model dedicated to the monolithic integration of DC-DC converters for portable applications. The numerical simulation based on the FEM (finite elements method) shows that 3D modeling of the integrated inductor allows better estimation of the electrical parameters of the desired inductor. The optimization of the electrical parameter values is based on the numerical analysis of the influence of the geometric parameters on the electrical characteristics of the inductor. Using the VHDL-AMS language, implementation of the integrated inductor in a micro Buck converter demonstrate that simulation results present a very promising approach for the monolithic integration of DC-DC converters.

A Studyon the Drawing of Rectangular Rod from Round Bar by using Rigid Plastic FEM and Neural Network (강소성 유한요소법과 신경망을 이용한 직사각재 인발공정에 관한 연구)

  • Kim, Y.C.;Choi, Y.;Kim, B.M.;Choi, J.C.
    • Transactions of Materials Processing
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    • v.8 no.4
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    • pp.331-339
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    • 1999
  • In this study, to analyze the shaped drawing process from round bar, the practical conical die with considering die radius and bearing was defined by a mathematical expression, and also a simple technique for initial mesh generation to the shaped drawing process was proposed. The drawing of rectangular section from round bar, one of the shaped drawing process, has been simulated by using non-steady state 3D rigid plastic finite element method in order to evaluate the influence of semi-die angle and reduction in area to corner filling. Other process variables such as friction constant, rectangular ratio, die radius and bearing length were fixed during the simulation. An artificial neural network has been introduced to obtain the optimal process conditions which gave rise to a fast simulation.

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Prediction of ultimate moment anchorage capacity of concrete filled steel box footing

  • Bashir, Muhammad Aun;Furuuchi, Hitoshi;Ueda, Tamon;Bashir, M. Nauman
    • Steel and Composite Structures
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    • v.15 no.6
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    • pp.645-658
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    • 2013
  • The objective of the study is to predict the moment anchorage capacity of the concrete filled steel box (CFSB) as footing by using the 3D finite element program CAMUI developed by authors' laboratory. The steel box is filled with concrete and concrete filled steel tube (CFT) column is inserted in the box. Numerical simulation of the experimental specimens was carried out after introducing the new constitutive model for post peak behavior of concrete in compression under confinement. The experimental program was conducted to verify the reliability of the simulation results by the FE program. The simulated peak loads agree reasonably with the experimental ones and was controlled by concrete crushing near the column. After confirming the reliability of the FEM simulation, effects of different parameters on the moment anchorage capacity of concrete filled steel box footing were clarified by conducting numerically parametric study.

Analysis of Hydroforming Process for an Automobile Lower Arm by FEM (유한요소법을 이용한 자동차 로어암의 액압성형 해석)

  • Kim, J.;Chang, Y.C.;Kang, S.J.;Kang, B.S.
    • Transactions of Materials Processing
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    • v.10 no.7
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    • pp.534-542
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    • 2001
  • Tubular hydroforming has attracted increased attention in the automotive industry recently. In this study, a professional finite element program for analysis and design of tube hydroforming processes, has been developed, called HydroFORM-3D, which is based on a rigid-plastic model. With the developed program HydroFORM-3D, the hydroforming process for an automobile lower arm is analyzed and designed. The manufacturing process for a lower arm consists of tube bending, preforming, and final hydroforming. To accomplish successful hydroforming process design, thorough investigation on proper combination of process parameters such as internal hydraulic pressure, axial feeding, and tool geometry is required. This paper describes the influences of forming conditions on the hydroforming of a lower arm by using simulation to predict strain and tube shape during bending, preforming, and final hydroforming processes.

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A Study on the Minimization of Cutting Slope around Tunnel Portal (지형과 사교하는 갱구부의 비탈면 최소화 방안 연구)

  • Jeong Kwan Sik;Park Ji Hoon;Kim Gun Ho;Lee Wan Jae
    • 한국터널공학회:학술대회논문집
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    • 2005.04a
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    • pp.359-371
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    • 2005
  • The Cutting slope is to be minimized when a tunnel meets the contour of slope terrain at a right angle around its portal. However, a tunnel portal has been generally installed at a right angle to the longitudinal axis of a tunnel with no consideration of the intersection angle with the slope terrain. This sometimes tended to cause huge cutting slope that resulted in many disadvantage in terms of safty, economy and environment. Therefore, the minimization of cutting slope is studied by taking the intersection angle into account, and the result is compared with that by the conventional method. In addition a design method for the inclined portal to the tunnel axis is proposed through 3D-FEM analysis, also the applicable ground condition is suggested.

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Design and Analysis with the magnetic shape coefficients of Linear Homopolar Synchronous Motor for vehicles (자기부상/추진 일체형 차량용 LHSM의 자기형상계수를 고려한 설계와 특성해석)

  • Jang, S.M.;Jeong, S.S.;Lee, S.H.;Seo, J.H.
    • Proceedings of the KIEE Conference
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    • 1997.11a
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    • pp.22-24
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    • 1997
  • The 4-pole LHSM was composed of the figure-of-eight shaped 3-phase armature windings. DC field windings, and the segmented secondary with the transverse bar track. The motor was designed on the base of the performance characteristic equations and the equivalent circuit model, with the coefficients of the magnetic shape. These coefficients were computed from the analytical expressions and examined from FEM analysis. The magnetic equivalent circuit of 3-D model of LHSM was obtained. and this concept provided the equivalent models for 2-D FEM analysis. Therefore, the airgap field, the lift and thrust force were calculated and compared with the results of magnetic equivalent circuit method.

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Design and Performance Evaluation of Extension-Type Actuators with a Displacement Amplification Mechanism Based on Chevron Beam

  • Jo, Yehrin;Lee, Euntaek;Kim, Yongdae
    • Journal of Aerospace System Engineering
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    • v.15 no.6
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    • pp.1-9
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    • 2021
  • In this study, a new design of an extension-type actuator (ExACT) is proposed based on a chevron structure with displacement amplification mechanisms by local heating. ExACT comprises diamond-shaped displacement amplification structures (DASs) containing axially oriented V-shaped chevron beams, a support bar that restricts lateral heat deformation, and a loading slot for thin-film heaters. On heating the thin film heater, the diamond-shaped DASs undergo thermal expansion. However, lateral expansion is restricted by the support bar, leading to displacement amplification in the axial direction. The performance parameters of ExACT such as temperature distribution and extended displacement is calculated using thermo-mechanical analysis methods with the finite element method (FEM) tool. Subsequently, the ExACTs are fabricated using a polymer-based 3D printer capable of reproducing complex structures, and the performance of ExACTs is evaluated under various temperature conditions. Finally, the performance evaluation results were compared with those of the FEM analysis.