• Title/Summary/Keyword: Shape Optimal Design

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Die Shape Optimal Design in Bimetal Extrusion by The Finite Element Method (유한요소법에 의한 이중 금속봉 압출 공정의 금형 형상 최적설계)

  • 변상민;황상무
    • Transactions of Materials Processing
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    • v.3 no.3
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    • pp.302-319
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    • 1994
  • A new approach to die shape optimal design in bimetal extrusion of rods is presented. In this approach, the design problem is formulated as a constrained optimization problem incorporated with the finite element model, and optimization of the die shape is conducted on the basis of the design sensitivities. The combinations of the core and sleeve materials.

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Shape Optimal Design to Minimize Stress Concentration in the Journal of the Heating Drum for a Hot-Rolling Press (열간압연 프레스용 가열드럼 저어널부의 응력집중 최소화를 위한 형상 최적설계)

  • Kim Won-Jin;Lee Boo-Youn
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.3
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    • pp.137-145
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    • 2005
  • The present research deals with structural analysis and optimal design of the heating drum of a hot-rolling press for medium density fiberboard. Stress concentration in the journal of the heating drum is analyzed by the submodel technique of the finite element method. The fatigue life under operating conditions is analyzed and evaluated by the stress-life theory. Shape optimal design problems, to minimize the maximum stress occurring in the journal, are formulated and shape parameters of the corner fillets of the journal are defined as the design variables. The problems are solved by the numerical optimization method and optimal shapes are found. The optimal designs are shown to be reliable in terms of the maximum stress and the fatigue life.

Shape Optimal Design of an Automotive Pedal Arm Using the Taguchi Method (다구찌 기법을 이용한 자동차 페달 암의 형상 최적설계)

  • Lee, Boo-Youn;Lee, Hyun-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.3
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    • pp.76-83
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    • 2007
  • The Taguchi method is applied to obtain the optimal design of an automotive pedal arm in consideration of the stiffness test specification. Design parameters are defined to describe shape of the pedal arm. Volume, maximum Von-Mises stress and maximum displacement of the pedal arm are established as the smaller-the-better characteristics. Optimal parameters are determined on the basis of the analyzed level averages of the characteristics.

A Finite Element Analysis and Shape Optimal Design with Specified Stiffness for U-typed Bellows (U형 벨로우즈의 유한요소해석과 특정 강성을 위한 형상최적설계)

  • Koh, K.G.;Suh, Y.J.;Park, G.J.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.6
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    • pp.96-111
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    • 1995
  • A bellows is a component installed in the automobile exhaust system to reduce the impact from an engine. It's stiffness has a great influence on the natural frequency of the system. Therefore, it must be designed to keep the specified stiffness that requires in the system. This study present the finite element analysis of U-typed bellows using a curved conical frustum element and the shape optimal design with specified stiffness. The finite element analysis is verified by comparing with the experimental results. In the shape optimal design, the weight is considered as the cost function. The specified stiffness from the system design is transformed to equality constraints. The formulation has inequality constraints imposed on the fatigue limit, the natural frequencies, the buckling load and the manufacturing conditions. A procedure for shape optimization adopts a thickness, a corrugation radius, and a length of annular plate as optimal design variables. The external loading conditions include the axial and lateral loads with a boundary condition fixed at an end of the bellows. The recursive quadratic programming algorithm is selected to solve the problem. The result are compared with the existing bellows, and the characteristics of the bellows is investigated through the optimal design process. The optimized shape of the bellows are expected to give quite a good guideline to the practical design.

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Shape Optimal Design to Minimize the Weight of a Mask-Frame for OLED Vapor Deposition (OLED 증착용 마스크 프레임의 무게 최소화를 위한 형상최적설계)

  • Lee, Boo-Youn
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.10
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    • pp.4685-4693
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    • 2013
  • Present work deals with a shape optimal design to minimize the weight of the mask-frame used in the process of OLED vapor deposition by the fine metal mask. A design concept for an optimal shape of the frame to increase the stiffness and to reduce the weight is derived using the topology optimization, shape design variables of the frame by adopting slots being defined. An optimal shape is determined by solving the shape optimization problem to minimize the weight of the frame under constraints of the maximum displacement. Weight of the optimal design is 117.6 kg, which is reduced by 138.4 kg(54.1%) of that of the first design, 256 kg.

Shape Optimal Design to Minimize Dynamic Twisting Deformation of the Door Frame of a Microwave Oven (전자레인지 도어 프레임의 동적 비틀림 변형 최소화를 위한 형상 최적설계)

  • Lee, Boo-Youn;Koo, Jin-Young;Kim, Won-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.11
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    • pp.1479-1485
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    • 2006
  • To minimize the leakage of microwave which can occur when one pulls the door of a microwave oven during its operation, shape optimization of the door frame is presented. A numerical optimization is implemented to minimize the dynamic twisting deformation of the door frame. Shape design variables are defined, which represent the dimension of the bead in the flange. Two optimal design problems are established to minimize the maximum twisting deformation from harmonic response analysis. The problems are solved, their results being compared and evaluated.

Application of Genetic Algorithm to Die Shape Otimization in Extrusion (압출공정중 금형 형상 최적화문제에 대한 유전 알고리즘의 적용)

  • 정제숙;황상무
    • Transactions of Materials Processing
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    • v.5 no.4
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    • pp.269-280
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    • 1996
  • A new approach to die shape optimal design in extrusion is presented. The approach consists of a FEM analysis model to predict the value of the objective function a design model to relate the die profile with the design variables and a genetic algorithm based optimaization procedure. The approach was described in detail with emphasis on our modified micro genetic algorithm. Comparison with theoretical solutions was made to examine the validity of the predicted optimal die shapes. The approach was then applied to revealing the optimal die shapes with regard to various objective functions including those for which the design sensitivities can not be deter-mined analytically.

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The Shape Optimal Design of Marine Medium Speed Diesel Engine Piston (박용(舶用) 중속(中速) 디젤엔진 피스톤의 형상최적설계(形狀最適設計))

  • Lee, Jun-Oh;Seong, Hwal-Gyeng;Cheon, Ho-Jeong
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.9
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    • pp.59-70
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    • 2008
  • Polynomial is used to optimize crown bowl shape of a marine medium speed diesel engine piston. The primary goal of this paper is that it's for an original design through a thermal stress and highest temperature minimum. Piston is modeled using solid element with 6 design variables defined the positional coordinate value. Global optimum of design variables are found and evaluated as developed and integrated with the optimum algorithm combining genetic algorithm(GA) and tabu search(TS). Iteration for optimization is performed based on the result of finite element analysis. After optimization, thermal stress and highest temperature reduced 0.68% and 1.42% more than initial geometry.

Shape Optimal Design of the Door Frame of a Microwave Oven to Minimize Its Twisting Deformation (비틀림 변형 최소화를 위한 전자레인지 도어 프레임의 형상 최적설계)

  • Lee Boo-Youn;Koo Jin-Young
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.8
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    • pp.1016-1023
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    • 2006
  • When one opens the door of a microwave oven during its operation, twisting deformation of the door occurs, which may cause leakage of microwave through the gap between the door and the front plate. A numerical optimization is implemented to minimize the gap by maximizing twisting stiffness of the door of the oven. Design variables are deformed, which describe the shape of the bead in the horizontal and vertical flanges of the door frame. To minimize the twisting deformation, Two optimal design problems to find shapes of the bead in the flange are established. The problems are solved by a numerical optimization technique, their results being evaluated.

Development of Shape Optimization System using Stress Control (응력 제어를 통한 형상 최적화 시스템 개발)

  • 한석영;배현우
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.8 no.3
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    • pp.52-58
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    • 1999
  • In this study, the growth-strain method was used for shape optimization. The adequate value of growth ratio in the method was used the value obtained by volume control. And the linear PID control theory was applied to control internal stresses by stresses required by a designer. The effect of the values of $K_{P}$, $K_{I}$, and $K_{D}$ was investigated and the adequate values of $K_{P}$, $K_{I}$, and $K_{D}$ were determined empirically. Finally, a shape optimal design system was built up by the improved the growth-strain method with a commercial software I-DEAS. The effectiveness and practicality of the developed shape optimal design system was verified by some examples.les.les.les.

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