• Title, Summary, Keyword: 분산분석(ANOVA)

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Pridiction of chip breakability by an orthogonal array method (직교배열법에 의한 칩절단특성 예측)

  • 이영문;양승한;권오진
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1008-1011
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    • 2001
  • The purpose of this paper is to evaluate the chip breakability during turning using the experimental equation, which is developed by an orthogonal array method. The chip breaking index(CB), non-dimensional parameter is used in the evaluation of chip breakability. The analysis of variance(ANOVA)-test has been used to check the significance of cutting parameters. And using the result of ANOVA-test, the experimental equation of chip breakability, which consists of significant cutting parameters, has been developed.

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Optimum Working Condition of Surface Roughness for End-Milling Using Taguchi Design (다구찌 기법을 이용한 엔드밀 가공시 최적 표면거칠기를 위한 가공조건선정)

  • 이상재;배효준;전태옥;박흥식
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.553-556
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    • 2003
  • End-milling have been used in the industrial world because it is very effective to the manufacture of mechanical parts with various shape. Recently the end-milling processing is needed the high-precise technique with good surface roughness and rapid time in aircraft, automobile part and molding industry. Therefore this study carried to decide the optimum cutting condition for surface roughness and rapid manufacturing time using design of experiment and ANOVA. From the results of experimentation, surface roughness have an effect on cutting direction, spindle speed and depth of cut. And then the optimum condition used Taguchi design is upward cutting in cutting direction, 600rpm in spindle speed, 240mm/min feed rate, 2mm in axial depth of cut and 0.25mm radial depth of cut. By using design of experiment, it is effectively represented shape characteristics of working surface in end-milling.

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ANOVA for Water Repellent Finish data (발수가공 데이터의 분산분석)

  • Yun, Jung-Beom
    • Journal of the Korean Society for Quality Management
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    • v.16 no.1
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    • pp.43-48
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    • 1988
  • Most of silicone used for water repellent finish is MHP (methyl hydrodiene polysiloxane), which is formed by hydrolysis and condensation polymerization of MHD (methyl hydrodiene dichlorosilane: Me H Si $Cl_2$). The cross-linking theory explains the water repellent mechanism of MHP. The silicone finish on fiber could improve in handle, softness, abrasion resistance, soil repellency, tear strength and crease resistance, as well as water repellency. According to using method silicone-water repellent finishing agents, could be devided into air dry type and curing type. MHP is the typical curing type of water repellent finishing agent, and this type requires the curing temperature above $150^{\circ}C$ at least. High curing temperature is the very drawback of this curing type. For this reason, there has been global interest in the lowering of its temperature. The objective of this study is to investigate merits of alkali treatment for silicone finishing by ANOVA and LSD (least significant difference).

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Effects of Process Parameters on the Wear Behavior of Thermally Sprayed Ni-based Hard Coatings (니켈기 경질 용사코팅의 마모거동에 미치는 공정조건의 영향)

  • Kim, Kyun-Tak;Kim, Yeong-Sik
    • Tribology and Lubricants
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    • v.26 no.3
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    • pp.157-161
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    • 2010
  • This study investigated the effects of spray parameters on wear behavior of the Ni-based hard coatings fabricated by thermal spray process. The experiment was designed by an orthogonal array, the Ni-based hard coatings were fabricated according to this experimental design. The wear test was performed on these coatings using ball-on-disk wear tester. The ANOVA was used to analyze the effects of spray parameters on the wear rate of these coatings, as a result, oxygen gas flow and acetylene gas flow were determined as main factors effected on the wear rate. The effects of these two factors on wear behavior were observed by using SEM and EDX.

Optimal design of formed tool for die of rubber seals using design of experiments (실험계획법에 의한 러버실 금형가공을 위한 총형공구의 최적설계)

  • Li Lihai;Lim P.;Lee H.K.;Yang G.E.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.694-697
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    • 2005
  • The design of experiments are used for optimal design of formed tools to machine automobile bearing rubber seal die, which is classified into the high precision rubber mold. The clearance angle, rake angle and the length cutting edge are considered as the factors. The cutting force is selected to be a characteristic value and compared with the mean tool wear and life by repeated experiments. The design of the experiment is based on the repeated one-way factorial design, which finds the significance of the factors and the best level to predict the tool life by using ANOVA and regression.

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Investigation on the Injection Molding Characteristics Using Taguchi Method (다구찌법을 이용한 미세사출 성형 인자에 대한 고찰)

  • Shin K. H.;Yoon G. S.;Chang S. H.;Jung W. C.;Kim M. Y.;Heo Y. M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.147-152
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    • 2005
  • In recent industry, according to pursuit the miniaturization and high-precision of machine part with development of new technology as IT, BT the development of mold manufacturing technology for mass production is accompanied. In this study, the spiral type injection mold with a $200{\mu}m$ thickness shape is made for investigation of influence for injection molding process variables and the flow length is measured through an experiment. Beside, the result of each experiment Is compared with the analysis result of CAE. Taguchi method is used in this experiment and the obtained data are analyzed using ANOVA method.

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Evaluation and optimization of geometric error by using Taguchi method (다구찌기법에 의한 형상오차 평가 및 최적화)

  • 지용주;곽재섭;하만경
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.298-303
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    • 2004
  • parameters in surface grinding. Taguchi method which is one of the design of experiments has been introduced in achieving the aims. The process parameters were the grain size, the wheel speed, the depth of cut and the table speed. The effect of the process parameters on the geometric error was examined and an optimal set of the parameters was selected to minimize the geometric error within the controllable range of the used grinding machine. The reliability of the results was evaluated by the ANOVA.

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Application of ANOVA and DOE by Using Randomized Orders and Geometrical Properties (랜덤화 순서와 기하학적 특성을 고려한 분산분석과 실험계획의 응용방안)

  • Choe, Seong-Un
    • Proceedings of the Safety Management and Science Conference
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    • pp.277-292
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    • 2012
  • The research presents an application of Balanced ANOVA (BANOVA) by utilizing randomized orders for various Split-Plot Designs (SPDs) which include two cell designs, split-plot with one-way HTC (Hard to Control) factor, split-plot with two-way HTC factor, split-split-plot design and nested design. In addition, four MINITAB examples of 2-level split-plot designs based on the number of blocks and the type of whole-plots are presented for practitioners to obtain comprehensive understanding. Furthermore, the geometrical interrelated properties among three typical Designs of Experiments (DOE), such as Factorial Design (FD), Response Surface Design (RSD), and Mixture Design (MD) are discussed in this paper.

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Analyzing the Competence of Construction Engineers in Apartment Construction (아파트 공사에서의 건설기술자 역량 분석 연구 - 공무업무를 중심으로 -)

  • Kim, Hu Yong;Kim, Yea Sang
    • Korean Journal of Construction Engineering and Management
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    • v.19 no.6
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    • pp.14-23
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    • 2018
  • In the domestic construction industry, large-scale housing construction projects are being carried out by construction companies with competitiveness in the domestic top 10, it is said that the competence of the construction engineer is a factor for the success of the project. In Korea, there is National Competency Standards (NCS) that systematize contents of knowledge, technology, and attitude required in order to perform job in industrial field as the importance of individual ability is systemized in the country. Therefore, in this study, defined the detail competence in construction administration works, and examined the level of competence and degree of impotance detailed competency of construction engineers using AHP analysis & ANOVA. As a result, it was found that the current capacity of the Engineers in the apartment construction work is insufficient compared to the level of the competence they think they have, and that they have different competencies depending on their work experience and job position. This means that if the career is accumulated, the capacity that is possessed naturally will be changed. Therefore, it will be necessary to improve the capacity of the construction engineers who have a short work experience and a low job level.

A Study on Behavioral Characteristics for Ecotourism in Nature-Oriented Groups-Focus on Nature-Oriented Groups in the Metropolitan Area, Korea- (자연지향적 집단의 생태관광 행동특성에 관한 연구-수도권지역의 자연지향적 단체를 중심으로-)

  • 유기준;최인묵
    • Korean Journal of Environment and Ecology
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    • v.13 no.2
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    • pp.167-175
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    • 1999
  • 본 연구의 목적은 자연지향적 집단의 생태관광 행동특성을 파악하는 데 있다. 이를 위해 서울지역의 5개 지역 지향적 집단을 중심으로 설문조사를 실시하였다. 설문조사는 여행객의 행동특성, 행동특성에 미치는 영향요소들, 그리고 행동특성에 영향을 주는 변수와의 차이를 분석하는데 중점을 두었는데, 이를 위해서 행동특성에 대한 요인분석과 독립변수들과의 차이를 알아보기 위해 일원배치 분산분석을 실시하였다. 연구결과 절대환경론자 및 정태형 생활양식을 가진 사람들은 계절과 방문빈도에 민감했으며 조화론자 및 모험형의 사람들은 동기부여에 영향을 주는 요소들과 장애요소들에 민감하게 반응하는 것으로 나타났다. 본 연구의 결과는 국내의 잠재적인 생태관광 시장의 효과적인 홍보 및 마케팅 전략수립에 기초적인 자료로서 제공할 수 있을 것으로 판단되며, 자료의 이용효율성 증대를 위해서는 생활양식적 차이와 다양성 요구에 의한 심리적 유형의 차이 및 개인의 환경관 등이 행동에 작용하는 범주와 영향의 구체적 원인에 대한 세부적인 연구가 향후 계속 되어야 할 것으로 판단된다.

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