• Title/Summary/Keyword: FIELD EXPERIMENTAL DESIGN

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Characteristics of Design Parameters on the Regenerative Blower Used for Building Fuel Cell System (건물 연료전지용 재생블로어 설계변수 특성연구)

  • Jang, Choon-Man;Lee, Jong-Sung
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.24 no.10
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    • pp.739-744
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    • 2012
  • This paper describes the blower performance used for single-stage high pressure regenerative blower. The blower considered is widely applied to the field of a fuel cell system, a medical equipment and a sewage treatment plant. Flow rate and rotating frequency of a impeller of the blower are considered as design parameters for the proper operation of the blower. Three-dimensional Navier-Stokes equations are introduced to analyze the performance and internal flow of the blower. Relatively good agreement between experimental measurements and numerical simulation is obtained. Throughout a numerical simulation, it is found that small and stable vortical flow generated inside the blade passage is effective to increase pressure and efficiency of the blower. Large local recirculation flow having low velocity in the blade passage obstructs the generation of stable vortical flow, thus increases the pressure loss of the blower. Detailed flow field inside the blower is also analyzed and discussed.

Development of an Automated Progressive Design System for Manufacturing Product with Multi Processes, Piercing, Bending, and Deep Drawing (복합공정(피어싱, 벤딩, 디프드로잉)을 갖는 제품 제조를 위한 프로그레시브 설계 자동화 시스템 개발)

  • Hwang, Beom-Cheol;Kim, Chul;Bae, Won-Byong
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.12
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    • pp.55-64
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    • 2008
  • This paper describes a research work of developing an automated progressive design system for manufacturing the product with multi processes such as piercing, bending, and deep drawing. An approach to the system for progressive working is based on the knowledge-based rules. Knowledge for the system is formulated from plasticity theories, experimental results and the empirical knowledge of field experts. The system consists of three main modules, which are shape treatment, strip layout, and die layout modules. Based on knowledge-based rules, the system is designed considering several factors, such as material and thickness of a product, piercing, bending and deep drawing sequence, and the complexities of the blank geometry and punch profiles. It generates the strip layout drawing for an automobile product. Die design for each process is carried out through the die layout module from the results of the strip layout module. Results obtained using the modules enable the designers for manufacturing products with multi processes to be more efficient in this field.

Optimal Design of Electric Field Driven Liquid Crystal Fresnel Lens Using Taguchi's Method (다구찌 실험계획법을 이용한 액정 전계 프레넬 렌즈의 최적 설계)

  • Kim, Bong-Sik;Kim, Jong-Woon;Park, Woo-Sang
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.25 no.3
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    • pp.218-223
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    • 2012
  • A rigorous electro-optical simulation and ray tracing for an electric field driven liquid crystal Fresnel lens was proposed to obtain design parameters of the electrode pattern of the Fresnel lens. The optimal design was carried out using Taguchi's experimental method for 17.1"($368{\times}229.5$ mm) wide LCD panels with 9 views. For the calculation of the distribution of liquid crystal molecules and the optical transmission of the panel, finite difference method and extended Jones matrix method were used to deal effectively with highly nonlinear and complicated motional equations of the liquid crystal molecules and to obtain the oblique transmission characteristics of the LCD panel. As simulation results, the optimal lengths of the 3 electrodes of the Fresnel lens are 4.0 ${\mu}m$, 30 ${\mu}m$ and 83 ${\mu}m$, respectively, and the locations of the second and third electrodes are 32.9-33.0 ${\mu}m$ and 45.9-46.0 ${\mu}m$, respectively. The optimal applied voltage of the 3 electrodes are found to be 5.75 V, 7.80 V and 11.9 V, respectively.

Development of umbrella anchor approach in terms of the requirements of field application

  • Evirgen, Burak;Tuncan, Ahmet;Tuncan, Mustafa
    • Geomechanics and Engineering
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    • v.18 no.3
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    • pp.277-289
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    • 2019
  • In this study, an innovative anchoring approach has been developed dealing with all relevant aspects in consideration of previous works. An ultimate pulling force calculation of anchor is presented from a geotechnical point of view. The proposed umbrella anchor focuses not only on the friction resistance capacity, but also on the axial capacity of the composite end structure and the friction capacity occurring around the wedge. Even though the theoretical background is proposed, in-situ application requires high-level mechanical design. Hence, the required parts have been carefully improved and are composed of anchor body, anchor cap, connection brackets, cutter vanes, open-close ring, support elements and grouting system. Besides, stretcher element made of aramid fabric, interior grouting system, guide tube and cable-locking apparatus are the unique parts of this design. The production and placement steps of real sized anchors are explained in detail. Experimental results of 52 pullout tests on the weak dry soils and 12 in-situ tests inside natural soil indicate that the proposed approach is conservative and its peak pullout value is directly limited by a maximum strength of anchored soil layer if other failure possibilities are eliminated. Umbrella anchor is an alternative to conventional anchor applications used in all types of soils. It not only provides time and workmanship benefits, but also a high level of economic gain and safe design.

Design of X band Microstrip Directional Couplers (X-대역 마이크로 스트? 방향성 결합기의 설계)

  • 양인응;홍완희
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.12 no.4
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    • pp.7-14
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    • 1975
  • A significant new technique in the dsvelopment of micro-wave circuits is the process of untilization of coupled lines in the transverse electro-magnetic field. The bases for this technique are the application of even-and odd-mode characteristic impedances of the transmission line. This article describes the properties of directional couplers and explains a prccfdure usrd to design micro-strip directional couplers with the aid of the computer. The article also describes the experimental results obtained from seven microstrip couplers, which were built to verify the computer program and the approximate solutions. It can be seen that in cases at X-band where couplings of 10 to 20dB are required, the computer program and approximate solutions will produce good results.

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High-Order Surface Gradient Coil Design Using Target Field Approach

  • Lee, J.K.;Yang, Y.J.;Jeong, S.T.;Choi, H.J.;Cho, Z.H.;Oh, C.H.
    • Journal of Biomedical Engineering Research
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    • v.17 no.1
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    • pp.19-24
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    • 1996
  • The purpose of this paper is to design high-order (or radial) surface gradient coil (SGC), which can provide multi-dimensional spatial selection. Although the spatial Selection with High-Order gradienT (SHOT) can provide a 2-D selection with only one selective RF pulse, the high-order gradient pro- duced by conventional cylindrical-shape coils has not been clinically useful due to the large selection size caused by the limited radial gradient intensity. However, by using the proposed high-order SGCs located near the imaging region, the size of volume selection can be reduced to a clinically useflll size of 1-2 cm in diameter by applying stronger radial gradient field with much less gradient driving power. So far radial SGCs have been designed by using the field component method and may cause distortion in the selection shapes. In this paper, by using the target field approach for the coil design, selected volumes became almost circular. A 40 cm-by-40 cm $z^2$_surface gradient coil has been designed and implemented by using the target field approach. Phantom and volunteer studies have been performed Experimental results using spatially localized MRI show good agreement to the theoretically predicted behavior.

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An Experimental Study for Basic Performance Evaluation According to the Glossing Surface Design Concrete (문양콘크리트의 광택화를 위한 기초적 성능평가에 관한 실험적 연구)

  • 김재은;김우상;조상영;김성식;임남기;정상진
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2004.05a
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    • pp.109-112
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    • 2004
  • Contemporary, architecture calls for a wide range of surface textures and treatments. A surface compatible with the architecture's design may vary from a glass-smooth finish to one requiring special sculptured ornamentation. These surfaces require many different types of form sheathing and lining. The purpose, of study development new design form and made elaborateness shape. Easy to used in field that architecture finish material not used expect effective reduce of working hours, personnel expenses, architecture finish material, cost, through this study, we have figured out the best mix proportion for durability and glossability of glossing exposure concrete.

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The Value and Meaning of 'Limited Edition' in 'Art Furniture' ('Art Furniture'에 있어서 'Limited Edition'의 의미와 가치 연구)

  • Choi, Byung-Hoon;Suh, Myoung-Won
    • Journal of the Korea Furniture Society
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    • v.23 no.1
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    • pp.38-46
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    • 2012
  • This article aimed to identify the significance of 'Limited Edition' in 'Art Furniture' field, which is rather well known in fine art like printing and sculpture. The consumer never responded to 'Art furniture' positively for its artistic quality and authenticity before than these days. For this, Author featured out current tendencies of 'Art Furniture' in terms of 'Limited Edition' can be easily found in well-known designer or artist's work, suggests designers should aim for their design. This desire, as a result, gave an opportunity to designers to produce new products in various different ways. And at the same time, suggest a new method in furniture design. Furthermore, 'Limited Edition' became a channel and opens a new environment for designers to explore and come up with new experimental designs.

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An Experimental Study on method of Design-Concrete & Development of Design-Form used Building Wall (건축벽체용 문양거푸집 개발을 통한 의장콘크리트 공법 연구)

  • 임현준;김종원;조상영;김우재;김성식;정상진
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.10a
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    • pp.501-506
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    • 2002
  • Contemporary architecture calls for a wide range of surface textures and treatments. A surface compatible with the architect's design may vary from a glass-smooth finish to one requiring special sculptured ornamentation. These surfaces require many different types of form sheathing and lining. The purpose of study development new design form and made elaborateness shape. Easy to used in field that architecture finish material not used expect effective reduce of working hours, personnel expenses, architecture finish material, cost. After this, building wall apply a variety shape in concrete surface

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Theoretical Terrains and Design Strategies of Landscape Urbanism (Landscape Urbanism의 이론적 지형과 설계 전략)

  • 배정한
    • Journal of the Korean Institute of Landscape Architecture
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    • v.32 no.1
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    • pp.69-79
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    • 2004
  • This Paper examines theoretical terrains and design strategies of landscape urbanism which is an emerging hybrid field at the intersection of architecture, landscape architecture, and urbanism. Landscape urbanism offers alternative approaches for theory, education, and practice in contemporary landscape architecture. It views the emergent urban complex sites-post-industrial sites, landfill, brownfield, urban void, etc., not as a weakness, but as a strength. Landscape urbanism poses an understanding of landscape as an element of urban infrastructure. In this sense, the landscape is seen in the context of contemporary urban development and public works. As a complex amalgam, landscape urbanism is more than a design style it is an ethos, an attitude, a way of thinking and acting. We can chart the main characteristics of landscape urbanism such as horizontality and surface, infrastructure, process, technique, and ecology. Multilayered examples of landscape urbanism can be seen in several experimental practices such as worts of Rem Koolhaas, MVRDV, Adriaan Geuze/West 8, James Comer, etc. It is possible to summarize the productive strategies for landscape urbanism as follows : thickening, folding, new materials, nonprogrammed use, impermanence, and movement.