• Title/Summary/Keyword: 3-D numerical analysis

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Analysis of Optical Pickup Actuator by 3-D EMCN method (3-D EMCN법을 이용한 광 픽업 액츄에이터의 해석)

  • Kim, Gin-A;Chung, Tea-Kyung;Choi, In-Ho;Hong, Sam-Yul
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.771-773
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    • 2001
  • In this paper, three dimensional Equivalent Magnetic Circuit Method(3-D EMCN method) a numerical analysis method which supplements to magnetic equivalent circuit adding numerical technique, is proposed for analysis Optical Pickup Actuator. (3) This method provides better characteristics both in precision of the analysis and in computation time than other analysis method such as three-dimensional Finite Element Method. We choose the simple 2-magnet moving coil type pickup actuator model and verify upper yoke effect using this method.

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Analysis and Optimal Design of Optical Pickup Actuator by 3-D EMCN method (3D-EMCN범을 이용한 광 픽업 엑츄에이터의 해석 및 최적설계)

  • Kim, Gin-A;Chung, Tea-Kyung;Choi, In-Ho;Hong, Sam-Yul
    • Proceedings of the KIEE Conference
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    • 2001.10a
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    • pp.12-14
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    • 2001
  • In this paper, three dimensional Equivalent Magnetic Circuit Method(3-D EMCN method), a numerical analysis method which supplements to magnetic equivalent circuit adding numerical technique, is proposed for analysis Optical Pickup Actuator. [3] This method provides better characteristics both in precision of the analysis and in computation time than other analysis method such as three-dimensional Finite Element Method. RCS Niching Genetic Algorithm are used for optimal design.

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The Study on the Stress Concentration Ratio of Low Slump Mortar Grouting Mixtures for Improving the Soft Ground (연약지반 보강을 위한 저유동성 몰탈 개량체의 응력분담비에 관한 연구)

  • Park, Eonsang;Kim, Byungil;Park, Seungdo
    • Journal of the Korean GEO-environmental Society
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    • v.21 no.9
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    • pp.15-24
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    • 2020
  • In this study, the stress concentration ratio for the improved material of the low slump mortar grouting was evaluated through the composite ground method, the ground arching theory, the plastic angle method, the 2D and 3D numerical analysis and the 3D model experiment. The stress concentration ratio calculated by the composite ground method was 89.3, 3.75~59.0 when the three-dimensional ground arching theory was applied, and 82.8 for the three-dimensional plastic angle method. As a result of the 2D numerical analysis, the stress concentration ratio was 63.0~77.0, which was found to increase as the improvement ratio increased. The results of 3D numerical analysis were predicted to be 50.0~56.0 smaller than the results of 2D analysis. In the case of a special model experiment using a large triaxial compression cell, the stress concentration ratio for each load step was 53.0~60.0, and the stress concentration ratio evaluated by the experiment was measured within 2D and 3D numerical analysis predictions. In this study, a predictive equation for the stress concentration ratio according to the improvement ratio is proposed based on the analysis and experimental values for the improved ratio of the low slump mortar grouting.

A Unified 3D Numerical Analysis of a Model Scramjet Engine with a Cavity Flame-Holder and Two Intake Side Walls (공동형 보염기를 갖는 모델 스크램제트 엔진의 흡입구 측면효과를 고려한 3차원 통합 유동해석)

  • Yeom, Hyo-Won;Kim, Sung-Jin;Sung, Hong-Gye;Kang, Sang-Hoon;Yang, Soo-Suk
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.11a
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    • pp.590-593
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    • 2009
  • To identify the detailed 3D flow characteristics of a model scramjet engine, a unified 3D numerical analysis was performed. The numerical domain of concern includes the entire flow path of the model scramjet engine extending from the intake to the nozzle exhaust. Turbulent models($k-{\omega}$ SST and low Reynolds number k-e with Sarkar model) were applied with comparison of experiment result. Intake side wall's effect on flow characteristics was analyzed in view points of flow quality at inlet duct and near the flame holder as well. The code is paralleled with multi-block feature using MPI(Massage Passing Interface) library to speed up the 3D calculation.

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Analysis and Evaluation of Separation Efficiency on Mass Flow of Mini Hydro Cyclone Separator Manufactured by 3D Printing (3D 프린팅을 적용한 미니 하이드로 싸이클론 분리기의 질량유량을 통한 분리효율 해석 및 평가)

  • Yi, Hyung-wook;Lee, Yeo-ul;Lee, Myung-won;Kwon, Je-young;Kang, Myungchang
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.7
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    • pp.89-96
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    • 2021
  • In this study, a mini hydro cyclone was designed and manufactured to achieve an inlet flow rate of 2 L/min in the experiment, which was conducted using alumina powder with a specific gravity of 3.97. This hydro cyclone was studied for using in steam and water analysis system (SWAS) of thermal power plant and was manufactured by 3D printing. Numerical analysis was performed with Solidworks Flow Simulation, utilizing the reynolds stress method (RSM) of fluid multiphase flow analysis models. Experimental and numerical analysis were performed under the three conditions of inlet velocity 2.0, 4.0, and 6.0 m/s. The separation efficiency was over 80% at all inlet velocity conditions. At the inlet velocity 4m/s, the separation efficiency was the best, and it was confirmed that the efficiency was more than 90%.

Behavior of Geotextile Tube by Numerical Analysis (수치해석기법을 이용한 지오텍스타일 튜브의 거동분석)

  • 신은철;오영인;조인휘
    • Proceedings of the Korean Geotechical Society Conference
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    • 2003.03a
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    • pp.385-392
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    • 2003
  • Traditional forms of river and coastal structures have become very expensive to build and maintain, because of the shortage of natural rock. Geotextile tubes hydraulically or mechanically filled with dredged materials have been applied in hydraulic and coastal engineering in recent years(shore protection structure, detached breakwater, groins and jetty). Recently, new preliminary design criteria supported by model and prototype tests, and some stability analysis calculations have been studied. In this study, the numerical analysis was performed to investigate the behavior of geotextile tube with various properties of geotextile and hydraulic pumping conditions. Numerical analysis was executed to compare with the results from the large-scale field model tests, and also compared the results of 2-D plane strain analysis and 3-D FEM analysis. A geotextile tube was modeled using the commercial finite element analysis program ABAQUS and the one-quarter of tube was modeled. Behavior of geotextile tube during the hydraulic pumping procedure was analyzed by comparing the large-scale field model test and numerical analysis. The shape variation and maximum tube height between the numerical analysis results and large-scale filed test results are turned out to be a good agreement.

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Probability analysis of optimal design for fatigue crack of aluminium plate repaired with bonded composite patch

  • Errouane, H.;Deghoul, N.;Sereir, Z.;Chateauneuf, A.
    • Structural Engineering and Mechanics
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    • v.61 no.3
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    • pp.325-334
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    • 2017
  • In the present study, a numerical model for probability analysis of optimal design of fatigue non-uniform crack growth behaviour of a cracked aluminium 2024 T3 plate repaired with a bonded composite patch is investigated. The proposed 3D numerical model has advanced in literatures, which gathers in a unique study: problems of reliability, optimization, fatigue, cracks and repair of plates subjected to tensile loadings. To achieve this aim, a finite element modelling is carried out to determine the evolution of the stress intensity factor at the crack tip Paris law is used to predict the fatigue life for a give n crack. To have an optimal volume of our patch satisfied the practical fatigue life, a procedure of optimization is proposed. Finally, the probabilistic analysis is performed in order to a show that optimized patch design is influenced by uncertainties related to mechanical and geometrical properties during the manufacturing process.

A Numerical Analysis Study for Prototype Crushed-Stone Compaction Pile (실물크기 쇄석다짐말뚝에 대한 수치해석 연구)

  • Hwang, Geun-Bae;Jung, Sung-Min;Lee, Min-Hee;Choi, Yong-Kyu
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.66-73
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    • 2004
  • Prototype crushed-stone compaction pile(${\Phi}=700mm$) were constructed on specific test site. Static loading tests for crushed-stone compaction piles were performed. Based on the static loading test results, finite element analysis was performed using software PENTAGON 3D. Numerical analysis were done for the area replacement ratio($a_s$) of $20{\sim}70%$ and $a_s$ was varied as a step of 10%. In the single crushed-stone compaction pile, settlement was decreased as $a_s$ was increased. In the group pile, this tendency was similar. In the in-sit test and numerical analysis, as $a_s$ increased, the stress concentration ratio was increased. But $a_s$ in the numerical analysis were more than that of in-situ test, greatly.

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Parametric Study with the Different Size of Meshes in Numerical Analysis Considering the Dynamic Soil-Pile Interactions (지반-말뚝 동적 상호 작용을 고려한 말뚝의 수치 모델링 : 메쉬 크기와 형상에 대한 매개 변수 연구)

  • Na, Seon-Hong;Kim, Seong-Hwan;Kim, Myoung-Mo
    • Proceedings of the Korean Geotechical Society Conference
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    • 2009.09a
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    • pp.1441-1446
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    • 2009
  • Numerical analysis is a powerful method in evaluating the soil-pile-structure interaction under the dynamic loading, and this approach has been applied to the practical area due to the development of computer technology. Finite Difference Method, one of the most popular numerical methods, is sensitive to the shape and the number of mesh. However, the trial and error approach is conducted to obtain the accurate results and the reasonable simulation time because of the lack of researches about mesh size and the number. In this study, FLAC 3D v3.1 program(FDM) is used to simulate the dynamic pile model tests, and the numerical results are compared with the 1G shaking table tests results. With the different size and shape of mesh, the responses of pile behavior and the simulation time are estimated, and the optimum mesh sizes in dynamic analysis of single pile is studied.

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Evaluation of Performance Characteristics by Dual Arrangement of Mini-hydrocyclone Separators (미니 하이드로 사이클론 분리기의 이중배열을 통한 성능특성 평가)

  • Kwon, Je-Young;Kim, Seung-Kyung;Hong, Jun-Gyu;Yi, Hyung-Wook;Kang, Myungchang
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.11
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    • pp.17-23
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    • 2021
  • A cyclone is a dust-separating mechanism that works on the principle of centrifugal force. The performance of a cyclone is evaluated using pressure loss and collection efficiency. A multi-cyclone arrangement is used to improve the collection efficiency within a limited area. In this study, experiments and numerical analyses were conducted on a dual arrangement of mini-hydrocyclone separators, which was fabricated using 3D printing. The experiment was performed at an inlet flow rate of 0.7 m/s, and alumina powder with a particle size of 0.5, 15, and 50 ㎛. ANSYS FLUENT, was used for the numerical analysis. The reliability of the numerical analysis was verified through a comparison with the experimental results. The errors in the experiment and numerical analysis were confirmed to be 2% at the outlet flow rate.