• Title/Summary/Keyword: 실험계획법

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Molding Design Factors Optimization for Maximizing Shrinkage Uniformity of Injection Molded Part using Design of Experiments (실험계획법을 이용한 사출품의 균일 수축을 위한 성형 설계인자의 최적화)

  • Park, Jong-Cheon;Kim, Kyung-Mo;Yin, Jeong-Je;Lee, Jae-Hoon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.6
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    • pp.70-76
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    • 2011
  • This paper presents an optimization procedure for reducing warpage of injection molded part by using a volumetric shrinkage deviation as an objective function. A design of experiments based on orthogonal arrays was used in the optimization procedure, and the entire optimization was performed through a two stage process - a preliminary experimentation and a principal experimentation. Proposed optimization method was applied to the design of a CPU-base part in computer. With the moderate number of experiments, an optimal molding condition for uniform distribution of volumetric shrinkage was obtained, as a result, the warpage of the molded part was significantly reduced.

Optimum selection of machining parameters of Wire Electrical Discharge Machining using Taguchi method (다구찌 실험계획법을 이용한 와이어 방전가공의 최적 가공조건 선정)

  • 임세환;김주현;이위로;박주승
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.10a
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    • pp.123-128
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    • 2002
  • The machining parameters for the wire electrical discharge machining(WEDM), including no load voltage, pulse-on time, pulse-off time, wire tension, water flow rata offset etc. should be chosen properly so that a better performance can be obtained An optimum selection of machining parameters relies heavily on the operators technologies and experience. This study presents a method by means of Taguchi method to select optimal machining parameter combination for an cutting speed or surface roughness. Experimental results demonstrate that the machining models are appropriate and the derived machining parameters satisfy the real requirements in notice.

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Performance Evaluation for Coordinate Measuring Machine using Design of Experiments (실험계획법을 이용한 3차원 좌표 측정기의 성능 평가)

  • Lee, Seung-Pyo;Ha, Sung-Kyu
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.4
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    • pp.133-139
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    • 2008
  • With the increasing demand for higher production quality and growing competition in the global market, coordinate measuring machine(CMM) has been widely used in industry to improve the efficiency and effectiveness of measurement. In this paper the performance evaluation of coordinate measuring machine is proposed using design of experiments. A factorial design is applied to carry out the performance test proposed by ISO 10360 with a length bar and to investigate CMM measurement errors associated to orientation and length in the work volume. The determination of the significance of effects in an experiment is made through the analysis of variance(ANOVA). The results show that the proposed method is suitable to analyze the factors which affect the CMM measurement performance.

Design Optimization of a RC Building Structure for Minimizing Material Cost (재료비 최소화를 위한 RC 빌딩 구조물의 최적설계)

  • Ahn, Hee-Jae;Park, Chang-Hyun;Choi, Dong-Hoon;Jung, Cheul-Kyu
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2010.04a
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    • pp.568-573
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    • 2010
  • 본 논문에서는 압축하중 및 풍하중, 지진하중을 받는 RC (Reinforced Concrete) 빌딩 시공에 필요한 부재의 재료비를 최소화하기 위해 부재의 부피를 최소화하는 최적설계를 수행한다. 최적설계 수행을 위해 상용 PIDO (Process Integration and Design Optimization) 툴인 PIAnO (Process Integration, Automation and Optimization)에서 제공하는 다양한 설계기법들을 이용한다. 먼저 실험계획법을 사용하여 실험계획을 세우고, 실험점에 따라 범용 구조해석 프로그램인 MIDAS Gen을 사용하여 구조해석을 수행한다. 그리고 해석결과를 바탕으로 각 응답에 대한 근사모델을 생성한 후 근사모델과 최적화기법을 이용하여 최적설계를 수행하고, 제한조건을 만족하면서 부재의 부피를 최소화함으로써 제안된 설계방법의 유효성을 보인다.

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Design Optimization of Centrifugal Pump Impeller Using DOE (실험계획법을 사용한 원심펌프 임펠러 최적설계)

  • Kim, Sung;Choi, Young-Seok;Yoon, Joon-Yong;Kim, Deok-Su
    • The KSFM Journal of Fluid Machinery
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    • v.11 no.3
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    • pp.36-42
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    • 2008
  • In this paper, the performance characteristics of the impeller in a centrifugal pump were investigated using DOE(Design of Experiment) with commercial CFD software. Geometric parameters of vane plane development were defined with the meridional shape and frontal view of the impeller. The incidence angles and the exit blade angle were selected as main parameters using 2k factorial and the influences of selected design parameters were examined through the optimization process using RSM.

Synthesized silicon oxide thin film by low pressure chemical vapor deposition(LPCVD) (저진공 화학기상증착법을 이용한 산화실리콘 박막 제작)

  • Lee, Gyeong-Hwang;Kim, Sang-Won;Park, Jong-Won;Park, Yeong-Hui;Heo, Gyu-Yong
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2008.11a
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    • pp.59-60
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    • 2008
  • 산화실리콘 박막은 생체적합성, 폴리머 필름의 gas barrier, 저유전율, 환경차단 보호막 등 다양한 특성을 갖고 있어 연구개발이 활발하게 이루어지고 있다. 본 연구는 저진공 화학기상증착법 (LPCVD)를 이용하여 산화실리콘 박막을 제작하였다. 실리콘 박막을 위한 전구체는 환경 친화적이며 상온에서 비교적 높은 증발점을 갖는 hexamethyldisiloxane (HMDSO)을 이용하였으며, 이때 기판은 실리콘을 이용하였다. LPCVD의 공정변수는 전구체 공급량(진공도)과 RF power를 중심으로하여 Taguchi 실험계획법에 따라 박막을 제작하였다. 또한, 실험계획법에 의해 최적 전구체 공급량과 RF power를 결정하고 산소분압의 변화에 따른 산화실리콘 박막을 제작하였다. 산화실리콘 박막은 표면특성 및 화학적 결합상태를 수접촉각, SEM, AFM, FTIR 등을 이용하여 관찰하고 분석하였다.

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Pedestrian Protection System Design for SUV Using the Design of Experiments (실험계획법을 이용한 SUV의 보행자 보호 시스템 설계)

  • Lee, Youngmyung;Choe, Wonseok;Park, Gyung-Jin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.1
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    • pp.24-32
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    • 2016
  • The mortality rate of car-pedestrian accidents is quite high, compared to the frequency of accidents. Researches on pedestrian protection are being actively performed worldwide. The A-pillar and lower part of the wind shield cause the most serious damage to the pedestrians. Typical devises to protect the pedestrians are the hood lift system and pedestrian airbag. The design of such devices for an sport utility vehicle is performed based on a design process using design of experiments (DOE). The design results are obtained by an orthogonal array (OA), analysis of mean (ANOM) and analysis of variance (ANOVA). A metamodel is also used in the design process.

Sequential Design of Experiment Based Topology Optimization (순차적 실험계획법을 이용한 위상 최적 설계)

  • Song, Chi-Oh;Park, Soon-Ok;Yoo, Jeong-Hoon
    • Transactions of the Society of Information Storage Systems
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    • v.3 no.4
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    • pp.178-182
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    • 2007
  • Topology optimization methods are classified into two methods such as the density method and the homogenization method. Those methods need to consider relationships between the material property and the density of each element in a design domain, the relaxation of the design space, etc. However, it is hard to apply on some cases due to the complexity to compose the design objective and its sensitivity analysis. In this paper, a modified topology optimization is proposed to assist designers who do not have mathematical or theoretical background of the topology optimization. In this study, optimal topology of structures can be achieved by the sequential design of experiment (DOE) and the sensitivity analysis. We conducted the DOE with an orthogonal array and the sensitivity analysis of design variables to determine sensitive variables used for connectivity between elements. The modified topology optimization method has advantages such as freedom from penalizing intermediate values and easy application with basic DOE concept.

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Error-robust experimental designs: D- and heteroscedastic G-optimalities (D-와 이분산 G-최적을 중심으로 한 오차로버스트 실험계획법)

  • 김영일
    • The Korean Journal of Applied Statistics
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    • v.6 no.2
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    • pp.303-309
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    • 1993
  • In this paper we have defined two approaches to be error-robust when the precise form of error-structure is unknown. An experiment is optimal by the first criterion if it maximizes the minimum effciency over all candidates of error structure and is optimal by the second if it maximizes the minimum average of the efficiency over all candidates of error structure. In order to appreciate the basic implications of each design criterion, these approaches are applied to two different experimental situations, D- and heteroscedastic G-optimalities.

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Optimal Parameter Design for Al/SiC Composites using Design of Experiments (실험계획법에 의한 Al/SiC 복합재료의 최적공정 설계)

  • Lee, K.J.;Kim, K.T.;Kim, Y.S.
    • Journal of Power System Engineering
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    • v.15 no.5
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    • pp.72-76
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    • 2011
  • In this work, the parameter optimization for thermal-sprayed Al/SiC composites have been designed by $L_9(3^4)$ orthogonal array and analysis of variance(ANOVA). Al/SiC composites were fabricated by flame spray process on steel substrate. The hardness of composites were measured using micro-vickers hardness tester, and these results were analyzed by ANOVA. The ANOVA results showed that the oxygen gas flow, powder feed rate and spray distance affect on the hardness of the Al/SiC composites. From the ANOVA results, the optimal combination of the flame spray parameters could be extracted. It was considered that experimental design using orthogonal array and ANOVA was efficient to determine optimal parameter of thermal-sprayed Al/SiC composites.