• 제목/요약/키워드: One-dimensional numerical analysis

검색결과 691건 처리시간 0.03초

이차원 보증정책을 갖는 제품의 보증비용 모형 (Warranty Cost Models for a Product with a Two-Dimensional Warranty Policy)

  • 김제숭
    • 품질경영학회지
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    • 제28권1호
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    • pp.57-77
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    • 2000
  • A two-dimensional warranty policy, two types of warranty criteria, such as the age and mileage of an automobile, are employed simultaneously to determine the eligibility of a warranty claim. We deal with the analysis of a variety of combined two-dimensional free replacement warranty(FRW) and pro-rata replacement warranty(PRW). In this paper we also propose the analysis of policies with item failures modelled using the one-dimensional and two-dimensional approach, respectively. We obtain expressions for the expected warranty costs and illustrate through numerical examples.

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응답변위법에 의한 터널의 내진해석 (Seismic Analysis of Tunnel Response by Response Displacement Method)

  • 윤세웅;신종호;박두희
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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    • pp.457-462
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    • 2009
  • In this study, seismic analysis is performed using simplified method, analytical solution and numerical analysis based on one-dimensional seismic site response analysis. The results show that analytical solution of tunnel response is predicted more conservative than numerical solution. And simplified method is not appropriate for seismic analysis of tunnel response. In addition, it is reasonable to determine shear-modulus reduction ratio performing seismic site response analysis to consider ground nonlinear-behavior.

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Numerical Solution of Nonlinear Diffusion in One Dimensional Porous Medium Using Hybrid SOR Method

  • Jackel Vui Lung, Chew;Elayaraja, Aruchunan;Andang, Sunarto;Jumat, Sulaiman
    • Kyungpook Mathematical Journal
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    • 제62권4호
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    • pp.699-713
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    • 2022
  • This paper proposes a hybrid successive over-relaxation iterative method for the numerical solution of a nonlinear diffusion in a one-dimensional porous medium. The considered mathematical model is discretized using a computational complexity reduction scheme called half-sweep finite differences. The local truncation error and the analysis of the stability of the scheme are discussed. The proposed iterative method, which uses explicit group technique and modified successive over-relaxation, is formulated systematically. This method improves the efficiency of obtaining the solution in terms of total iterations and program elapsed time. The accuracy of the proposed method, which is measured using the magnitude of absolute errors, is promising. Numerical convergence tests of the proposed method are also provided. Some numerical experiments are delivered using initial-boundary value problems to show the superiority of the proposed method against some existing numerical methods.

Experimental Study and Numerical Simulation of Cavity Oscillation in a Conical Diffuser

  • Chen, Chang-Kun;Nicolet, Christophe;Yonezawa, Koichi;Farhat, Mohamed;Avellan, Francois;Miyazawa, Kazuyoshi;Tsujimoto, Yoshinobu
    • International Journal of Fluid Machinery and Systems
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    • 제3권1호
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    • pp.91-101
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    • 2010
  • Based on the one-dimensional stability analysis, the self-excited oscillation in hydraulic power generating systems was studied by a simple experiment and numerical simulation. It was shown that a cavity in a conical diffuser can cause surge. With the diffuser, a high amplitude and low frequency oscillation occurs at low cavitation number. This oscillation was not observed with the straight pipe. It was confirmed that the diffuser effect of the draft tube can be the cause of the full load surge in hydraulic power system. Numerical results were also analyzed to check the validity of the one-dimensional stability analysis.

비선형 동적해석을 통한 입체라멘 교각의 파괴 메카니즘 모사 (Numerical Simulation of Failure Mechanism of Space Frame Structure by Nonlinear Dynamic Analysis)

  • 김익현
    • 한국지진공학회:학술대회논문집
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    • 한국지진공학회 2000년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 2000
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    • pp.348-355
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    • 2000
  • The characteristics on non linear behavior and the failure mechanism of RC space frame structure serving railway under seismic action have been investigated by numerical analysis in time domain. The structure concerned is modeled in 3 dimensional extent and RC frame elements with fibers are employed. Fibers are characterized as RC one and PL one to distinguish different energy release after cracking. Due to deviation of mass center and stiffness center of entire structure the complex behavior under seismic action is shown. The excessive shear force is concentrated on the pier beside flexible one relatively, which leads to failure of bridge concerned.

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3차원 자유표면파 모사를 위한 수치 파수조에 관한 연구 (A Study of Numerical Wave Tank for 3-Dimensional Free Surface Wave Simulation)

  • 하영록;김용직
    • 동력기계공학회지
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    • 제15권6호
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    • pp.27-34
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    • 2011
  • The increasing capabilities of the computers enable us to utilize various numerical schemes for the time-domain simulations concerned with 3-dimensional free-surface wave problems. There are still difficulties to solve such kind of problems, however. That's because long time simulations with large computational domain are needed in time-domain analysis. So, we need faster and more efficient numerical schemes to get the solutions practically for these problems. In this paper, a high-order spectral/boundary-element method is used for the numerical investigation of physics involved in wave-body interaction. This method is one of the most efficient numerical methods by which the nonlinear gravity waves can be simulated and hydrodynamic forces also can be calculated in time-domain. To get the robust study in these topics, various numerical tests are performed and compared with others' works.

딱딱한 막대 모양 분자로 이루어진 1차원 유체의 통계 역학적 분석 (A Statistical-Mechanical Analysis of One-Dimensional Fluid of Rigid Rods)

  • 임경희
    • 한국응용과학기술학회지
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    • 제26권1호
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    • pp.45-50
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    • 2009
  • Three-dimensional, statistical-mechanical formulations of problems are usually untractable analytically, and therefore they are commonly solved numerically. However, their one-dimensional counterparts are always to be solved analytically. In general analytical solutions sheds more insights to the problems than numerical solutions. Hence, solutions of one-dimensional problems may provide key properties to the problems, when they are extended to three dimensions. In this article, thermodynamic properties of one-dimensional fluid comprising molecules of rigid rods are analyzed statistical-mechanically. Molecules of rigid rods are characterized with repulsive or excluded volume effect. It is observed that this feature is well reflected in thermodynamic functions such as Helmholtz free energy. volumetric equation of state. chemical potential, entropy, etc.

육상구조물군에 작용하는 지진해일파력의 3차원수치해석 (Numerical Analysis for Three-Dimensional Tsunami Force Acting on Multi-Onshore Structures)

  • 이광호;하선욱;이귀섭;김도삼
    • 대한토목학회논문집
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    • 제31권2B호
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    • pp.175-185
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    • 2011
  • 본 연구에서는 복수의 육상구조물군에 작용하는 지진해일파력을 Navier-Stokes solver에 기초한 3차원혼상류해석법으로부터 수치적으로 검토하였다. 특히, 육상구조물의 배치형상과 호안에서의 이격거리 등에 따른 지진해일파력의 특성을 수치실험을 통해 조사하였다. 육상구조물군에 작용하는 지진해일파력에 대한 기존의 수리실험결과와 비교 및 분석하여 본 3차원수치해석의 적용성을 검토하였다. 그리고, 육상구조물에 작용하는 지진해일파력의 추정을 위해 정수압적인 방법과 동수압적인 방법을 각각 적용하여 기존실험결과 및 설계기준과의 비교를 통하여 3차원수치해석의 유용성을 검토하였으며, 기존실험결과와 수치해석결과를 동시에 고려하여 동수압적인 추정법에 관한 회귀식을 제안하였다. 이로부터 육상구조물에 작용하는 지진해일 파력의 산정에 관한 본 수치해석의 유용성을 확인할 수 있었다.

하천 만곡률과 홍수량에 따른 수면경사도 산정 (Estimation of the Water Surface Slope by the River Bend Curvature and Flood Discharge)

  • 최한규;이문희;백효선;박수진
    • 한국방재학회 논문집
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    • 제7권2호통권25호
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    • pp.65-71
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    • 2007
  • 본 연구는 만곡하천의 단면을 만곡률에 따라 1 2차원 수치해석을 실시하였다. 수치해석 결과 유 출입각에 따른 수위 편차가 발생하였으며, 홍수량 변동에 따른 편차가 증가하였다. 2차원 수치모형에 의한 수위편차를 보면 유 출입각 105도 일 때 홍수량 500CMS에서 최대경사가 6.67%가 나타났다. 우측은 90도를 초과하는 경우 1차원 수치모형과의 편차가 감소하였으며, 좌측의 수위는 105도를 초과하는 경우 1차원 수치모형과의 편차가 감소하는 것을 확인하였다. 이는 90도 이상의 만곡하천의 경우 수치해석보다는 수리모형실험을 통하여 검증하는 것이 바람직하겠다.

정규 압밀 점성토의 2차원 배수 압밀 거동에 대한 수치해석 (Numerical Analysis on Consolidation of Normally Consolidated Clays with 2-Dimensional Drainage)

  • 정영훈;정충기
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2000년도 봄 학술발표회 논문집
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    • pp.669-676
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    • 2000
  • The estimation of consolidation rate is one of the important factors in the construction on soft clayey deposits. A number of researches are carried out to predict the consolidation behavior in field, however, most of the results show the discrepancies between the prediction and observation. This paper analyzes consolidation behavior of normally consolidated clay in K/sub o/ condition with 2-dimensional drainage by use of the numerical methods. Elastic and elastic-plastic finite element analyses are compared in terms of the dissipation of excess pore pressure. These results are also compared with Terzaghi-Rendulic's equation that is implemented by finite difference method. The consolidation time calculated by using elastic model is found to be similar to the result of Terzaghi-Rendulic's equation. The consolidation predicted by MCC model takes more time than other cases. Initial increase of excess pore pressure in radial drainage can be shown, however, this phenomenon does not have a significant effect on tile final consolidation time.

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