• 제목/요약/키워드: Response Surface Methodology (RSM)

검색결과 743건 처리시간 0.03초

Vibration control of offshore wind turbine using RSM and PSO-optimized Stockbridge damper under the earthquakes

  • Islam, Mohammad S.;Do, Jeongyun;Kim, Dookie
    • Smart Structures and Systems
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    • 제21권2호
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    • pp.207-223
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    • 2018
  • In this inquisition, a passive damper namely Stockbridge Damper (SBD) has been introduced to the field of vibration control of Offshore Wind Turbine (OWT) to reduce the earthquake excitations. The dynamic responses of the structure have been analyzed for three recorded earthquakes and the responses have been assessed. To find an optimum SBD, the parameters of damper have been optimized using Response Surface Methodology (RSM) based on Box-Behnken Design (BBD) and Particle Swarm Optimization (PSO). The influence of the design variables of SBD such as the diameter of messenger cable, the length of messenger cable and logarithmic decrement of the damping has been investigated through response variables such as maximum displacement, RMS displacement and frequency amplitude of structure under an artificially generated white noise. After that, the structure with optimized and non-optimized damper has been analyzed with under the same earthquakes. Moreover, the comparative results show that the structure with optimized damper is 11.78%, 18.71%, 11.6% and 7.77%, 7.01%, 10.23% more effective than the structure with non-optimized damper with respect to the displacement and frequency response under the earthquakes. The results show that the SBD can obviously affect the characteristics of the vibration of the OWT and RSM based on BBD and PSO approach can provide an optimum damper.

유한 요소법과 반응표면법이 결합된 동기형 릴럭턴스 전동기의 특성해석 및 이방성 회전자 설계 (Characteristics Analysis & Optimum Design of Anisotropy Rotor Synchronous Reluctance Motor Using Coupled Finite Element Method & Response Surface Methodology)

  • 이일교;조용현;이중호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.754_755
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    • 2009
  • This paper deals with the characteristics analysis & optimum design of Synchronous Reluctance Motor (SynRM) with anisotropy rotor using a coupled Finite Element Method (FEM) & Response Surface Methodology (RSM). The focus of this paper is the characteristics analysis & optimum design relative to the output power on the basis of rotor materials of a SynRM. The coupled Finite Elements Analysis (FEA) & Preisach model have been used to evaluate nonlinear solutions. Comparisons are given with characteristics of normal synchronous reluctance motor and those of anisotropy rotor SynRM (ANISO-SynRM), respectively. The feasibility of using RSM with FEM in practical engineering problem is investigated with computational examples and comparison between the fitted response and the results obtained from an analytical solution according to the design variables of rotor in anisotropy rotor SynRM.

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최적화기법의 적용을 통한 냉간단조품의 성형공정 평가 (Evaluation of the Forging Process by the Application of Optimization Technology)

  • 여홍태;박건형;허관도
    • 소성∙가공
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    • 제15권3호
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    • pp.226-231
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    • 2006
  • The fuel injector is a pa.1 that controls the fuel supply of automotive engine. The housing of the fuel injector supports the rod, the needle valve and the solenoid. In this study, the rigid-plastic FE-analysis by using the design of experiments (DOE) and the response surface methodology (RSM) has been performed to produce the product reducing the under-fill and the maximum effective strain. From the results of DOE, the stem of counter punch and the face angle of punch at the $1^{st}$ process, and the stem of punch at the $2^{nd}$ process were determined as the significant design variables far each response such as the upper under-fill, lower under-fill and the maximum effective strain. From the results of RSM, the optimal values of the design variables have been also determined by simultaneously considering the responses.

반응표면법을 이용한 집중권선 동기 릴럭턴스 전동기의 토크 리플 저감에 관한 회전자 및 고정자 설계 (Rotor & Stator Design on Torque Ripple Reduction for a Synchronous Reluctance Motor with Concentrated Winding using Response Surface Methodology)

  • 최윤철;김홍석;이민명;이중호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 제38회 하계학술대회
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    • pp.860-861
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    • 2007
  • This paper deals with optimum design criteria to minimize torque ripple of concentrated winding Synchronous Reluctance Motor (SynRM) using Response Surface Methodology (RSM). The feasibility of using RSM with the finite element method(FEM) in practical engineering problem is investigated with computational examples and comparison between the fitted response and the results obtained from an analytical solution according to the design variables of stator and rotor in concentrated winding SynRM (6slot).

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Reliability analysis of a mechanically stabilized earth wall using the surface response methodology optimized by a genetic algorithm

  • Hamrouni, Adam;Dias, Daniel;Sbartai, Badreddine
    • Geomechanics and Engineering
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    • 제15권4호
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    • pp.937-945
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    • 2018
  • A probabilistic study of a reinforced earth wall in a frictional soil using the surface response methodology (RSM) is presented. A deterministic model based on numerical simulations is used (Abdelouhab et al. 2011, 2012b) and the serviceability limit state (SLS) is considered in the analysis. The model computes the maximum horizontal displacement of the wall. The response surface methodology is utilized for the assessment of the Hasofer-Lind reliability index and is optimized by the use of a genetic algorithm. The soil friction angle and the unit weight are considered as random variables while studying the SLS. The assumption of non-normal distribution for the random variables has an important effect on the reliability index for the practical range of values of the wall horizontal displacement.

Al 2024 합금의 측벽 엔드밀 가공 시 최적 가공조건 (Optimum Working Condition of Al 2024 Alloy in Side Wall End Milling)

  • 홍도관;안찬우;박진우;백황순
    • 한국기계가공학회지
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    • 제7권4호
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    • pp.37-43
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    • 2008
  • Working condition is one of the most important factors in precision working. In this study, we optimized the vibration acceleration level(VAL) of Al 2024 alloy to select optimum working condition of side wall end-milling using RSM(Response Surface Methodology). RSM was well adapted to make analytic model for minimizing vibration acceleration, created the objective function and saved a great deal of computational time. Therefore, it is expected that the proposed optimization procedure using RSM can be easily utilized to solve the optimization problem of working condition. The experimental results of the surface roughness and VAL showed the validity of the proposed working condition of side wall end-milling as it can be observed.

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Quality Prediction of Eggs Treated in Combination with Gamma Irradiation and Chitosan Coating Using Response Surface Methodology

  • Lee, Kyung-Heang;Jung, Samooel;Ham, Jun-Sang;Lee, Jun-Heon;Lee, Soo-Kee;Jo, Cheo-Run
    • Journal of Animal Science and Technology
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    • 제53권3호
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    • pp.253-259
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    • 2011
  • The aim of this work was to determine the method and predict the optimum conditions for egg quality stored for 7 days when combination treatments of irradiation and chitosan coating were applied using response surface methodology (RSM). A central composite design was chosen for the RSM in this study and the factors were irradiation dose (0~2 kGy) and concentration of chitosan coating material (0~2%). Performance of the irradiation and chitosan coating were evaluated by analyzing the egg quality and functional property factors. The predicted maximum level of Haugh units and foaming ability calculated by a developed model were 74.19 at 0 kGy of irradiation with coating by 0.96% chitosan solution and 50.83 mm at 2.0 kGy with 1.01%, respectively. The predicted minimum value of foam stability and 2-thiobarbituric acid reactive substances (TBARS) value were 2.97 mm at 0.39 kGy with 0.21% and 0.54 mg malonaldehyde/kg egg yolk at 0 kGy with 0.90% of chitosan solution, respectively. Results clearly showed that gamma irradiation negatively affected the Haugh unit and TBARS but positively affected the foaming capacity. The estimated value from the developed model by RSM was verified by no statistical difference with observed value. Therefore, RSM can be a good tool for optimization and prediction of egg quality when 2 or more treatments are combined. However, one should decide the target quality first to achieve a successful implementation of this technology.

내장재의 발화시간, 열방출율 및 최대화염 높이의 예측을 위한 반응표면방법론의 활용성 고찰 (The Applicable Investigation of Response Surface Methodology(RSM) for the Prediction of the Ignition Time, the Heat Release Rate and the Maximum Flame Height of the Interior Materials)

  • 하동명
    • 한국화재소방학회논문지
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    • 제20권2호
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    • pp.14-20
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    • 2006
  • 본 연구의 목적은 건축내장재의 발화시간과 열방출율을 예측하고자 한다. 반응표면방법론(RSM)과 문헌자료를 사용하여 건축내장제의 새로운 발화시간과 열방출율의 예측식을 제시하였다. 재료의 두께와 밀도에 의한 발화시간의 예측값과 문헌값의 A.A.P.E.는 4.35초, A.A.D.는 1.57초 그리고 상관계수는 0.987이였다. 버너의 폭과 열량에 의한 순열방출율의 예측값과 문헌값의 상관계수는 0.983이였으며, 버너의 폭과 열량에 의한 총열방출율의 예측값과 문헌값의 상관계수는 0.999였다. 또한 버너의 폭과 열량에 의한 최대 화염높이의 상관계수는 0.999로서, 제시한 예측식들에 의한 예측값은 문헌값과 일치하였다.

반응표면분석법(RSM)을 이용한 골탄의 불소 흡착 조건 최적화 (Optimization of Fluoride Adsorption on Bone Char with Response Surface Methodology (RSM))

  • 황지연;;;김준영;최영균;신귀암
    • 적정기술학회지
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    • 제5권2호
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    • pp.82-90
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    • 2019
  • 반응표면분석법(Response surface methodology, RSM)의 Box-Benhken Design (BBD) 모델을 사용하여, 350℃로 가열한 골탄의 수중 불소 흡착 조건을 최적화하였다. 최적화 변수로 수온, pH, 접촉시간, 초기불소농도를 선택하였고, Box-Behnken Design에 의한 29회의 매트릭스 실험값으로부터 2차 반응 표면식을 얻었다. 이 반응 모델식의 결정계수(R2)는 0.9249였고 모델의 p-value는 <0.0001로 나타나 실험 변수들이 흡착결과에 매우 유의미한 영향을 미친다는 것을 알 수 있었다. 반응 표면식에 의해 예측된 골탄의 불소 흡착 최적 조건은 수온 39.68℃, pH 6.25, 접촉시간 88.81 min, 초기불소농도 14.64 mgF/L이었으며 이때의 불소 흡착용량(adsorption capacity)은 6.46 mgF/g인 것으로 분석되었다.