• 제목, 요약, 키워드: The Butterfly Model

검색결과 41건 처리시간 0.044초

CAE에 기반한 DACE 모델을 이용한 버터플라이밸브 디스크의 최적설계 (Optimization of Butterfly Valve's Disc Using the DACE Model Based on CAE)

  • 박영철;강정호;이종문;강진
    • 한국해양공학회지
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    • v.20 no.3
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    • pp.96-102
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    • 2006
  • The butterfly valve has been used to control the switch and flux of fluid. While research about the characteristics of butterfly valve fluid have been done, study of the optimum design, considering structural safety, must keep pace with it. Thus, a method is proposed for an optimum butterfly valve. Initially, the stability of the butterfly valve, using FEM and CFD, is evaluated, and a variable is selected using the initial analysis results. Also, the shape optimization design is accomplished using the DACE model. In terms of research results, the experiment satisfied the objective and limitation functions.

Optimum seat design for the quadruple offset butterfly valve by analysis of variance with orthogonal array

  • Lee, Sang-Beom;Lee, Dong-Myung
    • 한국마린엔지니어링학회지
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    • v.38 no.8
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    • pp.961-967
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    • 2014
  • In onshore and offshore plant engineering, a broad use of pipe system have been achieved and accordingly related technologies has been developed especially in the field of flow control valves. The aim of this study is to suggest the quadruple offset butterfly valve for bi-directional applications which show equivalent operating torque characteristics of the triple offset butterfly valve. Seat design parameters for the quadruple offset butterfly valve are determined by the proposed method utilizing both ANOVA (analysis of variance) and the orthogonal array. Through additive model considering the effect of design parameters on seating torque, mean estimation is performed and thus its optimization results are verified by design of experiment results. The insight obtained from the present study is beneficial for valve design engineers to develop reliable and integrated design of the quadruple offset butterfly valve.

LNG선용 버터플라이밸브의 유동특성에 관한 연구 (제1부 : CFD해석과 실험결과의 비교) (Flow Characteristics of Cryogenic Butterfly Valve for LNG Carrier (Part 1 : CFD Analysis and its Comparison with Experimentation))

  • 김상완;최영도;김정환;이영호
    • 한국유체기계학회 논문집
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    • v.11 no.2
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    • pp.13-19
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    • 2008
  • Butterfly valves are widely used as control valves for industrial process. For the definition of optimum configuration of the valve, wide range of related studies has been actively conducted in the case of working fluids of water or air under the normal temperature. Recently, internal flow and performance characteristics of cryogenic butterfly valve for LNG carrier take a growing interest in the field of research and development. Therefore, present study is aimed to investigate the internal flow and performance characteristics of the cryogenic butterfly valve because the study result for the valve can be hardly found at present. Part 1 of this paper describes the study result of a butterfly valve model under the condition of the normal temperature. Succeeding Part 2 of this paper will describe the internal flow characteristics of a cryogenic butterfly valve for LNG carrier. The results of Part 1 show that pressure loss coefficients and flow rate coefficients obtained by the present experiment and CFD analysis agree well each other. Moreover, internal flow visualization for the valve by CFD analysis and PIV measurement have revealed complicated flow patterns of the internal flow field in detail.

고무시트 버터플라이밸브의 가속수명시험을 통한 수명특성 연구 (A Study of Life Characteristics of Butterfly Valve Seated Rubber by Accelerated Life Test)

  • 이기천;이용범
    • 한국유체기계학회 논문집
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    • v.16 no.5
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    • pp.29-35
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    • 2013
  • Butterfly valve seated rubber has been widely used in water works and industrial fields because it has advantages which are small installation area and low weight. The size and material of butterfly valve have been selected by service environments and purposes. But there are out of the ordinary to find papers for the life characteristics of the butterfly valve. So, this study carries out the accelerated life test, which has an acceleration factor with pressure, using performance and life test equipment. Accelerated model is adopted with 3 stress level and the inverse power law model to estimate the life of the test samples. After the analysis of the test result, accelerated index has 7.0 and the acceleration factor has 208 which is applied with field condition with the pressure 6.3 bar.

트리즈의 물리적 모순에 대한 모순해결 나비모형의 모순관계와 해결차원 분류 (Classification of Contradiction Relations and their Solving Dimensions based on the Butterfly Model for Contradiction Solving for Physical Contradiction of TRIZ)

  • 현정석;박찬정
    • 지식경영연구
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    • v.15 no.4
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    • pp.15-34
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    • 2014
  • Creative problem solving has become an important issue in many fields. Among problems, dilemma need creative solutions. New creative and innovative problem solving strategies are required to handle the contradiction relations of the dilemma problems because most creative and innovative cases solved contradictions inherent in the dilemmas. Among various kinds of problem solving theories, TRIZ provides the concept of physical contradiction as a common problem solving principle in inventions and patents. In TRIZ, 4 separation principles solve the physical contradictions of given problems. The 4 separation principles are separation in time, separation in space, separation within a whole and its parts, and separation upon conditions. Despite this attention, an accurate definitions of the separation principles of TRIZ is missing from the literature. Thus, there have been several different interpretations about the separation principles of TRIZ. The different interpretations make problems more ambiguous to solve when the problem solvers apply the 4 separation principles. This research aims to fill the gap in several ways. First, this paper classify the types of contradiction relations and the contradiction solving dimensions based on the Butterfly model for contradiction solving. Second, this paper compares and analyzes each contradiction relation type with the Butterfly diagram. The contributions of this paper lies in reducing the problem space by recognizing the structures and the types of contradiction problems exactly.

원관내 버터플라이 밸브 후류에 대한 수치해석 및 실험적 연구 (Numerical and Experimental Study on the Wake Flow of a Butterfly-Type Valve)

  • 심요셉;허형석;서용권
    • 한국해양공학회:학술대회논문집
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    • pp.220-224
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    • 2002
  • In this paper, flow in the wake region of a butterfly valve is studied numerically and experimentally. The disk angle of the valve is fixed as $30^{\circ}$ and the free stream velocity as 0.13m/s in the experiment. Numerical analysis is performed in similitude of the experiment. The standard LES model is used to represent the turbulence effect in the commercial code Fluent 5.5. It is shown that the numerical result is similar to the experimental result for the wake flow of a butterfly-type valve.

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연성해석과 통계적 방법을 이용한 Butterfly Valve의 다목적 최적설계 (Multi-objective Optimization of Butterfly Valve using the Coupled-Field Analysis and the Statistical Method)

  • 배인환;이동화;박영철
    • 한국정밀공학회지
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    • v.21 no.9
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    • pp.127-134
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    • 2004
  • It is difficult to have the existing structural optimization using coupled field analysis from CFD to structure analysis when the structure is influenced of fluid. Therefore in an initial model of this study after doing parameter design from the background of shape using topology optimization. and it is making a approximation formula using by the CFD-structure coupled-field analysis and design of experiment. By using this result, we conducted multi-objective optimization. We could confirm efficiency of stochastic method applicable in the scene of structure reliability design to be needed multi-objective optimization. And we presented a way of design that could overcome the time and space restriction in structural design such as the butterfly valve with the less experiment.

The Relationship between Local Distribution and Abundance of Butterflies and Weather Factors

  • Choi, Sei-Woong
    • The Korean Journal of Ecology
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    • v.26 no.4
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    • pp.199-202
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    • 2003
  • According to the energy hypothesis, the energy input per unit area primarily determines species richness in regions of roughly equal area. Some energy-related ecological research included identification of major climatic variables to determine regional species richness. In this study, the local butterfly species richness was examined to find out whether weather variables affected the local distribution or abundance of butterfly populations. Butterfly monitoring data from May 2001 to April 2002 taken at Mt. Yudal, Mokpo, in the southwestern part of Korea, and six weather variables (monthly mean values of temperature, precipitation, evaporation, wind speed, air pressure, and sunlight) were analyzed. Multiple regression analysis showed that only temperature explained 80% and 70% of the variability of log-transformed number of species and individuals, respectively, indicating that temperature played an important role in local species richness. Furthermore, global warming could affect the abundance and distribution of butterflies regionally as well as locally.

특성함수를 이용한 Butterfly Valve의 최적설계 (A Optimization of Butterfly Valve using the Characteristic Function)

  • 박영철;최종섭;강진
    • 한국해양공학회지
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    • v.19 no.3
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    • pp.59-65
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    • 2005
  • In today's industry, the butterfly valve has been used to control a flow effectively. However, it is difficult to have the existing structural optimization using field analysis from CFD to structure analysis when the structure is influenced by fluid. Therefore, an initial model of this study is to evaluate the stability of the valve using FEM and CFD. And, it selected variable using initial analysis results. Also, it accomplished the shape optimization design using the orthogonal arrangement and characteristic function. Research result, a few experiments showed the optimal results of there dimensional structures to be multi-objective.

분할-결합 원리와 상태모형에 대한 학습이 모순문제 해결과 성장 마인드세트에 미치는 영향 (Learning Effects of Divide-and-Combine Principles and State Models on Contradiction Problem Solving and Growth Mindset)

  • 현정석;박찬정
    • 지식경영연구
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    • v.14 no.4
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    • pp.19-46
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    • 2013
  • This paper aims to show the learning process and the educational effects of Divide-and-Combine principles and State Models, which are included in the Butterfly Model for creative problem solving. In our State Models, there are Time State Model, Space State Model, and Whole-Parts State Model. We have taught middle school students (for 18 hours), high school students (for 24 hours), and undergraduate students (for 1 semester) about our proposed Models when they solved contradiction problems. Also, we have made the students learn our contradiction resolution algorithms by themselves based on team-based discussion. By learning and by using our Models, the students had the higher level of expertise in contradiction problems and had the growth mindset that made them have confidence in themselves and kept them challenging themselves about problems. Also, learning and solving with our Models improved the students' growth mindset as well as their problem-solving ability.

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