• 제목/요약/키워드: analytical verification

검색결과 346건 처리시간 0.036초

박판성형시 컬 예측모델 개발(II)-실험적 검증 (Development of Prediction Model for Sidewall Curl in Sheet Meta1 Forming(II)-Experimental Validation)

  • 주병돈;박현규;김동우;문영훈
    • 소성∙가공
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    • 제16권6호
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    • pp.438-442
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    • 2007
  • Sidewall curl is the curvature that results from non-uniform through-thickness strain present in the sheet stamping process which involves material flow over a die radius. In order to understand and control curl for tight fit-up tolerances, an analytical model that can provide a reliable measure for the amount of curl would be very helpful. In this study, a model is developed based on the moment-curvature relationship during bending-under-tension operations. For the verification of analytical model, sidewall curl is experimentally measured after deformation of a strip using a bending-under-tension test system. The results show a consistent relationship between the theoretically predicted value and the experimentally obtained one, especially in regions of high curl.

Analytical solutions for bending of transversely or axially FG nonlocal beams

  • Nguyen, Ngoc-Tuan;Kim, Nam-Il;Lee, Jaehong
    • Steel and Composite Structures
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    • 제17권5호
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    • pp.641-665
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    • 2014
  • This paper presents the analytical solutions for the size-dependent static analysis of the functionally graded (FG) beams with various boundary conditions based on the nonlocal continuum model. The nonlocal behavior is described by the differential constitutive model of Eringen, which enables to this model to become effective in the analysis and design of nanostructures. The elastic modulus of beam is assumed to vary through the thickness or longitudinal directions according to the power law. The governing equations are derived by using the nonlocal continuum theory incorporated with Euler-Bernoulli beam theory. The explicit solutions are derived for the static behavior of the transversely or axially FG beams with various boundary conditions. The verification of the model is obtained by comparing the current results with previously published works and a good agreement is observed. Numerical results are presented to show the significance of the nonlocal effect, the material distribution profile, the boundary conditions, and the length of beams on the bending behavior of nonlocal FG beams.

표면 실장기(SMD) 성능 개선을 위한 민감도 해석 및 최적화 (The Senstivitiy Analysis and Optimiaztion for the Development of the SMD Performance)

  • 차인혁;한창수;김정덕
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1996년도 춘계학술대회 논문집
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    • pp.568-573
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    • 1996
  • In this paper, A design strategy of the Surface Mounting Device for accurate and better performance is studied. Analytical Modeling. Sensitivity analysis and optimization are being conducted. The ANSYS software and experimental method are used for verification of the analytical equations withboundary conditons. Through the sensitivity analysis, the most dominant design parameters can be detected. The optimum design parameters for performing given performing given perfomances are selected by using the optimization algorithm. The design tool based on the design strategy for the analysis, modeling and optimization will be useful for a re-design and better perofrmance of the SMD.

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표면 실장기(SMD) 성능 개선을 위한 민감도 해석 및 최적화 방안 (The Sensitivity Analysis and Optimization for the Development of the SMD Performance)

  • 차인혁;한창수;김정덕
    • 한국정밀공학회지
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    • 제14권2호
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    • pp.120-128
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    • 1997
  • In this paper, A design strategy of the Surface Mounting Device for accurate and better performance is studied. Analytical modeling, sensitivity analysis, and optimization are being conducted. The ANSYS software and experimental method are used for the verification of the analytical equations with boundary conditions. Through the sensitivity analysis, the most dominant design parameter can be detected. The optimum design parameters for improving the given performances are selected by using the optimiza- tion algorithm. The design tool based on the design strategy for the analysis, modeling, and optimization will be useful for are-design and better improving of the SMD.

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Simplified analytical model for flexural response of external R.C. frames with smooth rebars

  • Campione, Giuseppe;Cannella, Francesco;Cavaleri, Liborio;Monaco, Alessia
    • Structural Engineering and Mechanics
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    • 제66권4호
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    • pp.531-542
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    • 2018
  • In this paper an analytical model in a closed form able to reproduce the monotonic flexural response of external RC beam-column joints with smooth rebars is presented. The column is subjected to a constant vertical load and the beam to a monotonically increasing lateral force applied at the tip. The model is based on the flexural behavior of the beam and the column determined adopting a concentrated plasticity hinge model including slippage of the main reinforcing bars of the beam. A simplified bilinear moment-axial force domain is assumed to derive the ultimate moment associated with the design axial force. For the joint, a simple truss model is adopted to predict shear strength and panel distortion. Experimental data recently given in the literature referring to the load-deflection response of external RC joints with smooth rebars are utilized to validate the model, showing good agreement. Finally, the proposed model can be considered a useful instrument for preliminary static verification of existing external RC beam-column joints with smooth rebars for both strength and ductility verification.

최적화 기법을 이용한 비행체 구조물 동특성 해석 모델의 최신화 연구 (A Study on Updating of Analytic Model of Dynamics for Aircraft Structures Using Optimization Technique)

  • 이기두;이영신;김동수
    • 한국항공우주학회지
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    • 제37권2호
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    • pp.131-138
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    • 2009
  • 해석용 모델의 검증이란 완성된 모델이 실제 제품의 특성을 반영하고 있는지에 대한 확인절차이다. 일반적으로 해석모델작성 시 형상의 단순화 및 비선형특성의 반영에 대한 한계 등으로 공학적 가정을 이용하므로 실제 구조와는 다른 물리적, 기계적 특성을 갖게 된다. 본 연구에서는 순차적 2차계획법(Sequential Quadratic Programming, SQP)을 이용하는 목표달성기법(Goal-Attainment Method)의 다목적 최적화 기법을 이용하여 활공체 날개의 정적 처짐과 고유진동수 차이를 최소화하는 방법으로 구조모델의 최신화를 수행하였으며, 모드형상의 일치성을 정량적으로 판단하기 위하여 Modal Assurance Criterion(MAC)를 이용하였다.

특수 및 준특수 상세에 따른 철근콘크리트 전단벽의 비선형 내진거동 해석 (Analysis of Nonlinear Seismic Behavior of Reinforced Concrete Shear Wall Systems Designed with Special and Semi-Special Seismic Details)

  • 윤성준;이기학;천영수;김태완
    • 한국지진공학회논문집
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    • 제17권1호
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    • pp.43-51
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    • 2013
  • In this paper, analytical models for reinforced concrete shear wall systems designed based on Korean Building Code (KBC2009) are proposed, which have special and semi-special seismic details and are compared with experimental results for a verification of analytical models. In addition, semi-special seismic details aimed to improve constructability and enhance economic efficiency were proposed and evaluated. The analytical models were performed based on nonlinear static and dynamic analysis. Through the nonlinear analyses, two seismic details showed the similar seismic behavior from the cyclic test and the analytical models for the two different seismic details represented the behavior in terms of the initial stiffness, maximum strength and strength degradation. And newly proposed seismic details(semi-special) provided with similar hysterestic behavior as well as the maximum drift.

국지 부유퇴적물 농도의 결정을 위한 연직1차원 이류확산 방정식의 해석해 (An Analytical Solution of the Vertically One-dimensional Convection-Diffusion Equation for the Determination of Local Suspended Sediment Concentration)

  • Jung, Kyung-Tae;Jin, Jae-Youll;Kang, Hyoun-Woo;Cho, Hong-Yeon;Kim, Mee-Kyung;John Noye
    • 한국해안해양공학회:학술대회논문집
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    • 한국해안해양공학회 2003년도 한국해안해양공학발표논문집
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    • pp.208-215
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    • 2003
  • Convective-diffusion equations appear in various disciplines such as hydrology, chemical engineering and oceanography dealing with the transport problem of scalar quantities. Since it is nonlinear, numerical methods are generally used to obtain its solution. Very limited number of analytical solutions are available usually in cases when the convective velocity is constant or has a simple functional form (for some collection of the solutions, see Noye, 1987). There is however a continuing need to develop analytical solutions because of its practical importance. Analytical solutions of the convection-diffusion equation are valuable not only for the better understanding on the transport process but the verification of numerical schemes. (omitted)

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슬림 AU 합성보 내화성능 평가 (Fire Resistance Evaluation of SLIM AU Composite Beam)

  • 오명호;김명한
    • 한국공간구조학회논문집
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    • 제16권4호
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    • pp.53-58
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    • 2016
  • SLIM AU(A plus U-shaped) composite beam was developed for reducing the story height in the residential buildings, and saving the cosrtuction cost of floor structures. Structural performance and economic feasibility of the composite beam have been sufficiently approved through the structural experiments and the analytical studies. However, the verification for fire safety is necessary for the practical application of the composite beam. The fire resistance tests with and without loading were performed for the fire safety verification, and the test results were summarized in this paper.

규칙기반 고장진단 알고리즘의 실험적 연구 (A Study of Rule-based Fault Detection Algorithm in the HVAC System)

  • 조수;태춘섭;장철용;양훈철
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2005년도 동계학술발표대회 논문집
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    • pp.241-246
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    • 2005
  • The objective of this study is to develop a rule-based fault detection and diagnosis algorithm and an experimental verification using air handling unit. To develop an analytical algorithm which precisely detects a faulted component, energy equations at each control volume of AHU were applied. An experimental verification was conducted in the AHU at Green Building in KIER. In the experiment conducted in hot summer condition, the rule based FDD algorithm isolated a faulted sensor from HVAC components.

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