• 한국정밀공학회지
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• 제28권11호
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• pp.1297-1308
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• 2011

The light-weight design of UTM (Urban Transit Maglev)-02 car-body frames are performed, based on initial configuration. The thicknesses of fourteen sub-structures are defined as design variables and the loading condition is considered according to weight of sub-structures, electronic and pneumatic modules and passengers. For efficient and robust process of design optimization, objective function and constraints are approximated by response surface approximation. Structural analysis is performed at some sampling points to construct the approximated objective function and constraints composed of design variables. Design space is changed to find many optimal candidates and best optimal design can be found eventually. The Matlab Optimization Toolbox is used to find optimal value and sensitivity analysis about each design variable is also performed.

• KSBB Journal
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• 제15권4호
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• pp.393-397
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• 2000

The cometaboic biodegradation conditionso f trichloroethylene(TCE) by Burkholderia cepacia G4 were optimized using response surface analysis. The experimental sets of phenol concentration temperature and pH were designed using central composite experimental design. The optimal conditions of phenol concentration temperature and pH were determined to be 0.91 ppm 21.5$^{\circ}C$ and 7.65 respectively by the Ridge analysis of the contour plot for TCE biodegradation rates. The TCE biodegradation rate could be enhanced up to 2.43 nmol.mg protein$.$min by response surface methodology.

• 한국추진공학회지
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• 제17권4호
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• pp.10-15
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• 2013

설계 최적화를 위해서 설계자는 우선적으로 설계영역 전반에 걸쳐 정확한 정보를 획득하고, 설계영역 탐색을 실시한 후에 최적화를 실시해야 한다. 최근에 설계영역 탐색을 우선적으로 실행하기 위하여 실험계획법과 반응표면모델에 최적화를 적용하는 통합설계 프레임워크의 적용이 산업체 전반으로 일반화되고 있다. 본 연구에서는 터보팬 엔진 설계점 최적화를 위하여, 설계영역의 정보를 조밀하게 얻을 수 있으며 통계학적인 직교성과 균형성을 모두 만족하는 7 수준 직교배열을 생성한 후에 반응표면모델을 구축한다. 구축된 반응표면모델에 전역 최적값을 찾기 위하여 다목적 유전자알고리즘을 적용하여 주어진 제한조건을 만족하는 최적값을 찾아 GasTurb 결과와 검증을 수행한다.

• Journal of Mechanical Science and Technology
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• 제15권7호
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• pp.876-888
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• 2001

For a large scaled optimization based on response surface methods, an efficient quadratic approximation method is presented in the context of the trust region model management strategy. If the number of design variables is η, the proposed method requires only 2η+1 design points for one approximation, which are a center point and tow additional axial points within a systematically adjusted trust region. These design points are used to uniquely determine the main effect terms such as the linear and quadratic regression coefficients. A quasi-Newton formula then uses these linear and quadratic coefficients to progressively update the two-factor interaction effect terms as the sequential approximate optimization progresses. In order to show the numerical performance of the proposed method, a typical unconstrained optimization problem and two dynamic response optimization problems with multiple objective are solved. Finally, their optimization results compared with those of the central composite designs (CCD) or the over-determined D-optimality criterion show that the proposed method gives more efficient results than others.

• 한국기계가공학회지
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• 제7권4호
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• pp.135-141
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• 2008

Independent suspension axle and final reduction gear for special-purpose vehicles such as a armored vehicles are almost imported in Germany etc. so, developing them is necessary to save cost. In severe condition (open fields, water surface driving, obstacle pass), special-purpose vehicles must work well. Drop box, axle and final reduction gear performed static analysis. We know that is possible weight reduction. The purpose of this paper is to find out the optimal shape of final reduction gear's case by means of response surface methodology. The response surface method is the statistical method which can be applied to the non-sensitivity based optimization. The response surface which is constructed by the least square method contains only the polynomial terms so that the global maximum and minimum points are easily obtained.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1999년도 춘계학술대회논문집
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• pp.143-148
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• 1999

Design optimization is performed to calculated the draw-bead force for satisfying the design re-quirements. For an analysis tool a rigid-plastic finite element method with modified membrane element is adopted. response surface methodology is utilized for constructing the approximation surface for the optimum searching of draw bead force in sheet metal forming process. the algorithm developed is ap-plied to a design of the draw bead forces in a deep drawing process. The results show that the design of process parameters is applicable in complex metal forming analysis. It is also noted that the present algo-rithm enhances the stable optimum solution with small times of optimization iteration.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
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• pp.135-142
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• 2001

Design optimization of a transonic compressor rotor (NASA rotor 37) using response surface method and three-dimensional Navier-Stokes analysis has been carried out in this work. Baldwin-Lomax turbulence model was used in the flow analysis. Three design variables were selected to optimize the stacking line of the blade. Data points for response evaluations were selected by D-optimal design, and linear programming method was used for the optimization on the response surface. As a main result of the optimization, adiabatic efficiency was successfully improved. Ana, it is found that the design process provides reliable design of a turbomachinery blade with reasonable computing time.

• 한국기계가공학회지
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• 제8권3호
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• pp.46-53
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• 2009

To find the working condition is one of the important factors in precision machining. In this study, we analyzed maximum working temperature by infra-red camera and surface roughness in side wall end milling using design of experiment (DOE): RSM(response surface methodology), ANOM(analysis of means) and ANOVA(analysis of variance) by table of orthogonal array. ANOM and ANOVA are well adapted to select sensitivity of design variables for maximum working temperature and surface roughness. The effective design variables and their levels should be determined using ANOM, ANOVA. RSM is presented 2nd order approximation polynomial of maximum working temperature and surface roughness is composed with design variables. Therefore, it is expected that the proposed procedure using design of experiment : table of orthogonal array, ANOM, ANOVA and RSM can be easily utilized to solve the problem of working condition.

• 한국해안·해양공학회논문집
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• 제23권2호
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• pp.163-170
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• 2011

해상풍력단지 설계과정의 일환으로 실험계획법의 일종인 반응표면분석법을 이용하여 풍력터빈의 최적 배치조건을 연구하였다. 총 36기 터빈을 해상에 설치한다는 가정 하에 터빈들의 행렬조합, 행간 및 열간거리를 반응표면 분석시의 설계변수로 사용하였으며, 터빈 후류손실에 의해 저하되는 발전효율과 내부 전력선 공사비를 목적함수로 고려하였다. 이러한 설계변수와 목적함수간의 관계를 이용한 반응 최적화 분석을 통해 목표 설계조건을 도출하였으며, 해상풍력단지의 경제성을 확보하기 위한 풍력터빈의 배치조건은 "설계범위에서 행수 및 행간거리를 최소화하고, 최적 열간거리를 산정하여 적용해야 한다"는 결과를 얻을 수 있었다.

• 한국항공우주학회지
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• 제33권10호
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• pp.68-74
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• 2005

전압력 회복률을 극대화시키기 위하여 램제트 엔진 흡입구 최적형상이 수치적으로 조사되었다. 각 설계인자의 설계영역에 대해 성능을 근사적으로 예측하기 위하여 반응표면법을 도입하였다. 설계인자로는 첫 번째 램프각, 목직경, 그리고 디퓨져 확대각이 선택되었다. 얻어진 반응표면의 신뢰성 검증을 위해서 ANOVA가 사용되었다. 얻어진 최적모델의 전압력 회복률은 기준모델에 비해 36% 향상되었다. 또한 디퓨져에서의 점성손실은 5% 미만인 것으로 조사되었다.