• Title, Summary, Keyword: 링해석법

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Design and characteristics analysis of brushless rotary transformer for synchronous generator (동기 발전기 여자 시스템에서의 비접촉 회전형 변압기에 대한 설계 및 특성해석)

  • Son, Dong-Hyeok;Lee, Jong-Gab;Kim, Do-Sun;Cho, Yun-Hyun
    • Proceedings of the KIEE Conference
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    • pp.112-114
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    • 2007
  • 동기발전기 회전 계자형에서 비접촉 회전형 변압기를 제안함으로써 브러쉬와 슬립링을 이용하는 기존의 방식이 갖는 유지 보수와 정기적인 점거에 대한 문제점을 보완한다. 동기발전기 여자 시스템에 부합하는 비접촉 히전형 변압기를 설계하고 유한 요소법으로 특성을 해석하였다. 시작품 제작을 제작하고 실험함으로써 제안된 변압기의 타당성을 검증하였다.

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Massive Parallel Processing Algorithm for Semiconductor Process Simulation (반도체 공정 시뮬레이션을 위한 초고속 병렬 연산 알고리즘)

  • 이제희;반용찬;원태영
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.36D no.3
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    • pp.48-58
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    • 1999
  • In this paper, a new parallel computation method, which fully utilize the parallel processors both in mesh generation and FEM calculation for 2D/3D process simulation, is presented. High performance parallel FEM and parallel linear algebra solving technique was showed that excessive computational requirement of memory size and CPU time for the three-dimensional simulation could be treated successively. Our parallelized numerical solver successfully interpreted the transient enhanced diffusion (TED) phenomena of dopant diffusion and irregular shape of R-LOCOS within 15 minutes. Monte Carlo technique requires excessive computational requirement of CPU time. Therefore high performance parallel solving technique were employed to our cascade sputter simulation. The simulation results of Our sputter simulator allowed the calculation time of 520 sec and speedup of 25 using 30 processors. We found the optimized number of ion injection of our MC sputter simulation is 30,000.

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Time-lapse inversion of resistivity tomography monitoring data around a tunnel (터널 주변 전기비저항 토모그래피 모니터링 자료의 시간경과 역산)

  • Cho, In-Ky;Jeong, Jae-Hyeung;Bae, Gyu-Jin
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.11 no.4
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    • pp.361-371
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    • 2009
  • Resistivity tomography is very effective geophysical method to find out the resistivity distribution and its change in time around a tunnel. Thus, the resistivity tomogram can provide helpful information which is necessary for the effective maintenance of the tunnel. However, an air filled tunnel severely distorts tomography data, especially when the current or potential electrode is placed near the tunnel. Moreover, the distortion can often lead to misinterpretation of tomography monitoring data. To solve these problem, we developed a resistivity modeling and time-lapse inversion program which include a tunnel. In this study, using the developed program we assured that the inversion including a tunnel gives much more accurate image around a tunnel, compared with the conventional tomogram where the tunnel is not included. We also confirmed that the time-lapse inversion of resistivity monitoring data defines well resistivity changed areas around a tunnel in time.

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Comparison of Modelling Characteristics of Distinct Element Analysis Based on Implicit and Explicit Algorithm (Implicit 및 explicit 알고리즘에 기초한 개별요소 수치해석 방법의 모델 링 특성 비교 연구)

  • 류창하
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • pp.163-170
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    • 2000
  • The distinct element method has been effectively applied to the analysis of stability and behavior of jointed rock masses. In this paper the modelling characteristics of different types of distinct element model were investigated. Arch tunnel examples were chosen to compare the calculation results of two computer codes, NURBM and CBLOCK, where the former is based on implicit algorithm, and the other on explicit one. CBLOCK calculations show that joint properties are very important parameters in the stability analysis and that the joint stiffness ratio associated with joint configuration could be used as an indicator, whereas NURBM differ from that. Some other disagreements were also identified.

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Reliability Analysis Method with Variable Sampling Points (가변적인 샘플링을 이용한 신뢰도 해석 기법)

  • Yook, Sun-Min;Choi, Dong-Hoon
    • Proceedings of the KSME Conference
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    • pp.1162-1168
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    • 2008
  • This study provides how the Dimension Reduction (DR) method as an efficient technique for reliability analysis can acquire its increased efficiency when it is applied to highly nonlinear problems. In the highly nonlinear engineering systems, 4N+1 (N: number of random variables) sampling is generally recognized to be appropriate. However, there exists uncertainty concerning the standard for judgment of non-linearity of the system as well as possibility of diverse degrees of non-linearity according to each of the random variables. In this regard, this study judged the linearity individually on each random variable after 2N+1 sampling. If high non-linearity appeared, 2 additional sampling was administered on each random variable to apply the DR method. The applications of the proposed sampling to the examples produced the constant results with increased efficiency.

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Redundancy Management for a Duplex FBW Flight Control System (2중으로 다중화된 FBW/ FCS의 다중화 관리)

  • Nam, Yoon-Su;Hong, Sung-Kyung;Yoo, Chang-Sun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.32 no.10
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    • pp.46-52
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    • 2004
  • A design methodology of the redundancy management for a duplex FBW flight control system is introduced. A statistical analysis is applied to determine two design parameters in CCM(Cross Channel Monitor), threshold and persistence count. An analytic redundancy, which is implemented using a Kalman filtering algorithm is considered. The application of an analytic redundancy to the FCS design of the smart UAV has several advantages of increasing the aircraft's survivability and breaking the tie-condition for a duplex FCS. All the redundancy management algorithms are verified through the numeric simulation for the flight dynamics of the XV-15 tilt rotor.

Substructure Analysis of Steering System using Transfer Function Synthesis Method (전달함수합성법을 이용한 스티어링 시스템의 부분구조 해석)

  • Hong, Sung-Kyu;Kim, Do-Youn;Lee, Doo-Ho;Kim, Chan-Mook
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.201-206
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    • 2000
  • In this work transfer function synthesis method based on FRF data of each substructure is investigated for a complex structure composed of many substructures. Though the transfer function synthesis method has superiority to analyze the characteristics of interfaces among substructures effectively, many problems arise in the computation process, especially matrix inversion process. Due to computational problems, the error between the data obtained by test and the predictions through computations is inevitable. So in this paper, computational aspects in the transfer function synthesis method are examined through a steering system problem of passenger car. For the FBS method, frequency response functions of 3 substructures are measured experimentally. Effects of several parameters such as matrix inversion method, connection conditions between substructures and off-diagonal terms on system response are studied numerically.

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Design of New Hybrid-Ring Directional Coupler Using λ/6 Sections (λ/6선로를 이용한 새로운 형식의 하이브리드 링 방향성 결합기의 설계)

  • 양규식;이종악;김동일
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.16 no.3
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    • pp.275-283
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    • 1991
  • A design method of the new 7${\lambda}$/6 ring 3dB directional coupler using fundamental /6-sections is proposed and its frequency characteristics are analyzed. Furthermore, the experimental verification has been achieved in microstrip network, and hence, the validity of the design method of a microwave compoennt with the basic ${\lambda}$/6-sections proposed in this paper is confirmed.

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Buckling Analysis of Roll Forming Process using Finite element method (유한요소법을 이용한 롤포밍 공정에서의 버클링 해석)

  • Kim, Young-In;Kim, Jong-Hun;Jeoung, Young-Chul;Kim, Nak-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.9
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    • pp.1451-1456
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    • 2003
  • In code roll forming processes, the sheet metal strip is gradually and successively bent into a desired profile. Occurrence of buckling is one of the major defects. Buckling may occur due to longitudinal stress and it is difficult to predict buckling behavior. In this study an analytical method for buckling behavior during roll forming is proposed. All numerical simulations are performed by finite element analysis. The behavior of buckling can be predicted with the simulation modeling of the finite element method.

Analysis of Aluminium Ring Rolling Process Using Thermo-Rigid-Plastic Finite Element Method (강-열점소성 유한요소법을 이용한 알루미늄 링압연 공정 해석)

  • Koo, Sang-Wan;Lee, Jong-Chan;Yun, Su-Jin;Kim, Nak-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.5
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    • pp.815-822
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    • 2003
  • The ring rolling process involves not only three-dimensional non-steady material flow and continuous change of radius and thickness of the ring workpiece but also heat transfer among workpiece, rolls and environment. In this study, deformation and heat transfer analyses were conducted by using the three-dimensional thermo-rigid-plastic finite element method. Three cases of plain ring rolling process were, respectively, simulated for the predictions of roll forces and the highest temperature zone during the aluminum process that ductile fracture often occurs. In addition, to prevent fishtail phenomena of the ring workpiece, axial rolls were used for this study.