• Title/Summary/Keyword: FIELD EXPERIMENTAL DESIGN

Search Result 1,266, Processing Time 0.025 seconds

Comparative Study of Armature Reaction Field Analysis for Tubular Linear Machine with Axially Magnetized Single-sided and Double-sided Permanent Magnet Based on Analytical Field Calculations

  • Shin, Kyung-Hun;Park, Min-Gyu;Cho, Han-Wook;Choi, Jang-Young
    • Journal of Magnetics
    • /
    • v.20 no.1
    • /
    • pp.79-85
    • /
    • 2015
  • This paper presents a comparative study of a Tubular Linear Machine (TLM) with an Axially Magnetized Single-sided Permanent Magnet (AMSPM) and an Axially Magnetized Double-sided Permanent Magnet (AMDPM) based on analytical field calculations. Using a two-dimensional (2-D) polar coordinate system and a magnetic vector potential, analytical solutions for the flux density produced by the stator windings are derived. This technique is significant for the design and control implementation of electromagnetic machines. The field solution is obtained by solving Maxwell's equations in the simplified boundary value problem consisting of the air gap and coil. These analytical solutions are then used to estimate the self and mutual inductances. Two different types of machine are used to verify the validity of these model simplifications, and the analytical results are compared to results obtained using the finite element method (FEM) and experimental measurement.

Design of an Asymmetric-custom-surface Imaging Optical System for Two-dimensional Temperature-field Measurement

  • Guanghai Liu;Ming Gao;Jixiang Zhao;Yang Chen
    • Current Optics and Photonics
    • /
    • v.8 no.5
    • /
    • pp.484-492
    • /
    • 2024
  • In response to the difficulty of synchronously obtaining multiwavelength images for fast two-dimensional (2D) temperature measurement, a multispectral framing imaging optical system is designed, based on the segmented-aperture imaging method and asymmetric surface shape. The system adopts a common-aperture four-channel array structure to synchronously collect multiwavelength temperature-field images. To solve the problem of asymmetric aberration caused by being off-axis, a model of the relationship between incident and outgoing rays is established to calculate the asymmetric custom surface. The designed focal length of the optical system is 80 mm, the F-number is 1:3.8, and the operating wavelength range is 0.48-0.65 ㎛. The system is divided into four channels, corresponding to wavelengths of 0.48, 0.55, 0.58, and 0.65 ㎛ respectively. The modulation transfer function value of a single channel lens is higher than 0.6 in the full field of view at 35 lp/mm. The experimental results show that the asymmetric-custom-surface imaging system can capture clear multiwavelength images of a temperature field. The framing imaging system can capture clear images of multiwavelength temperature fields, with high consistency in images of different wavelengths. The designed optical system can provide reliable multiwavelength image data for 2D temperature-field measurement.

A Study on characteristic of sustainable design of architectural space on Norman Foster's works (Norman Foster의 건축 공간에 나타난 지속 가능한 디자인 특성에 관한 연구)

  • Kweon, Yeong-Jae;Kim, Jung-Shin
    • Korean Institute of Interior Design Journal
    • /
    • v.18 no.4
    • /
    • pp.11-20
    • /
    • 2009
  • Norman Foster has done about 300 projects over the world and has been understood as a global architect for sustainable design on various areas including urban design, architecture, interior, transport and furniture. The trend of Forster's work which had been changed positively as experimental trials from 1960 has established his design trend for sustainable design. The characteristics of Norman Foster's sustainable design leading the trend of contemporary architecture over the limit of the high-tech architecture is researched through the project report, literature, field study and interview based on sustainability aspects which are social, environment and economy especially. For systematic classification and modern analysis of Norman Foster's architecture, the research is analyzed architectural characteristics on case works focused on architecture and urban design after the middle of 1980 when Norman Foster's sustainable design was emerged clearly. Consequently, the research could be a substantial process for understanding sustainable design as current outstanding ideas which makes Norman Foster overcome his limit of Post-high tech architecture through looking at his spatial identity.

An Analysis of Trends in Smoking-Related Research (흡연.금연 관련 연구동향 분석 - 국민건강증진기금 연구를 중심으로 -)

  • Yang, Sook-Ja
    • Journal of Korean Public Health Nursing
    • /
    • v.22 no.2
    • /
    • pp.255-265
    • /
    • 2008
  • Purpose: The principal objective of this study was to assess the topics and research methods of smoking-related research and to suggest future research directions. Methods: The subjects of this study were smoking research articles supported by the National Health Promotion Funds from 1998 to 2007. A total of 41 articles were selected and analyzed from 1999 to 2005 using the frameworks such as topics, subjects contents, subjects, research field, and research design. Results: The most frequent topic of smoking-related research was the development & evaluation of educational programs for smoking prevention and smoking cessation (34.1%). The majority of the research subjects were adults (42.2%) and adolescents (35.9%). 31.7% of the total research researches was conducted at the nationwide population level. The most popular research design was the descriptive study (36.6%) in the non-experimental studies and nonequivalent control group pretest-posttest design(19.5%) in the experimental study studies. Conclusion: The topics of smoking research should be planned under governmental strategies for decreasing to a 30% reduction in of smoking rates, as established in the 2010 Health Plan. With regard to the methodological aspects, longitudinal and nationwide research was first required so that we could plan an evidence-based program for smoking prevention and smoking cessation.

  • PDF

A Study on the Verification of Dynamic Properities on the basis of Vibration Criteria of Isolation Pad (제진대(Isolation Pad)의 진동허용규제치에 기준한 동특성(動特性) 규명에 관한 연구)

  • 백재호;이홍기;서항석
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2001.05a
    • /
    • pp.869-874
    • /
    • 2001
  • In order that precision equipment using high precision industrial operate normally. vibration criteria of expected area that equipment be set up is micrometer level. that method is a trust design for apply to in field, when there attend to quantifiable method. Hence, semi -empirical method that using on the basis of experimental data about undefined information (properities of vibration source, dynamic properities of structure, etc.,) for prediction of vibration response make the use of dynamic structure design of semiconductor & TFT-LCD in the inside and outside country. Like this, for doing an optimal design of dynamic about structure, it is best important to get trust data that apply to semi-empirical method that is method of prediction vibration level. In this paper, on the basis of experimental data which was offered by a manufacturing company Of precisin equipment that plan to set up in semiconductor factory, we predicted vibration response on expected area that equipment be set up.

  • PDF

The Arrangement Process Optimization of Vacuum Glazing Pillar using the Design of Experiments (실험계획법을 이용한 진공유리 Pillar의 배치공정 최적화)

  • Kim, Jae Kyung;Jeon, Euy Seik
    • Journal of the Semiconductor & Display Technology
    • /
    • v.11 no.1
    • /
    • pp.73-78
    • /
    • 2012
  • In this study, the optimal process condition was induced about the pillar arrangement process of applying the screen printing method in the manufacture process of vacuum glazing panel. The high precision screen printing is technology which pushes out the paste and spreads it by using the squeegee on the stainless steel plate in which the pattern is formed. The screen printing method is much used in the flat panel display field including the LCD, PDP, FED, organic EL, and etc for forming the high precision micro-pattern. Also a number of studies of screen printing method have been conducted as the method for the cost down through the improvement of productivity. The screen printing method has many parameters. So we used Taguchi method in order to decrease test frequencies and optimize this parameters efficiently. In this study, experiments of pillar arrangement were performed by using Taguchi experimental design. We analyzed experimental results and obtained optimal conditions which are 4 m/s of squeegee speed, $40^{\circ}$ of squeegee angle and distance between metal mask and glass.

NUMERICAL ANALYSIS OF THERMAL STRATIFICATION IN THE UPPER PLENUM OF THE MONJU FAST REACTOR

  • Choi, Seok-Ki;Lee, Tae-Ho;Kim, Yeong-Il;Hahn, Dohee
    • Nuclear Engineering and Technology
    • /
    • v.45 no.2
    • /
    • pp.191-202
    • /
    • 2013
  • A numerical analysis of thermal stratification in the upper plenum of the MONJU fast breeder reactor was performed. Calculations were performed for a 1/6 simplified model of the MONJU reactor using the commercial code, CFX-13. To better resolve the geometrically complex upper core structure of the MONJU reactor, the porous media approach was adopted for the simulation. First, a steady state solution was obtained and the transient solutions were then obtained for the turbine trip test conducted in December 1995. The time dependent inlet conditions for the mass flow rate and temperature were provided by JAEA. Good agreement with the experimental data was observed for steady state solution. The numerical solution of the transient analysis shows the formation of thermal stratification within the upper plenum of the reactor vessel during the turbine trip test. The temporal variations of temperature were predicted accurately by the present method in the initial rapid coastdown period (~300 seconds). However, transient numerical solutions show a faster thermal mixing than that observed in the experiment after the initial coastdown period. A nearly homogenization of the temperature field in the upper plenum is predicted after about 900 seconds, which is a much shorter-term thermal stratification than the experimental data indicates. This discrepancy may be due to the shortcoming of the turbulence models available in the CFX-13 code for a natural convection flow with thermal stratification.

Design and Analysis of A Pico Propeller Hydro Turbine Applied in Fish Farms using CFD and Experimental Method

  • Tran, Bao Ngoc;Kim, Jun-ho
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.25 no.3
    • /
    • pp.373-380
    • /
    • 2019
  • In this paper, a pico hydro turbine employing low head circulation water at fish farms is designed and evaluated. Due to the advantages of simple structures, small head requirements, and low-cost investment, the constant thickness propeller turbine is considered as a feasible solution. The design process based on the free vortex method is presented in full detail, and a 4-blade runner is built using BladeGen. The turbine performance is analyzed both numerically and via experimental methods. Despite slight differences, the results show similar trends between CFD simulations and experiments carried out on factory test-rigs in a wide range of working conditions. At the design flow rate, the turbine achieves the best efficiency of 70 %, generating 3.5 kW power when rotating at 420 rpm. The internal flow field, as well as the turbine's behavior, are investigated through the distribution of blade streamlines, pressure, and velocity around the runner. Moreover, the pressure coefficient on the blade surface at 3 span positions is plotted while the head loss for each simulation domain is calculated and displayed by charts.

Development of BIM-based 3D Modeling Instruction Materials and its Application Analysis for Professional Drafting Subject of Specialized Vocational High School (특성화고 전문제도 과목을 위한 BIM 기반 3D 주택설계 수업자료 개발 및 적용)

  • Kwon, Se-Jeong;Yoo, Hyun-Seok
    • 대한공업교육학회지
    • /
    • v.43 no.1
    • /
    • pp.1-19
    • /
    • 2018
  • As the BIM designing technology has been applied recently in the construction field, architectural design education in the field of work and university has been changing to 3D modeling. Nevertheless, architectural design & drafting education in the construction specialized vocational high school is not responding appropriately to change. Despite the fact that students need to have 3D modeling design ability, there is a very lack of 3D housing design instructional material that can satisfy the change. The purpose of this study is to develop BIM-based 3D modeling instruction material and apply to analyze effect on interest and task performance ability on Housing Design. The 3D modeling instruction material used in this study was developed through four stages of preparation, development, implementation and evaluation according to the PDIE model procedure. Also, the experimental design model for hypothesis testing was used nonequivalent control group pretest-posttest design. Based on the experimental design model, BIM-based 3D modeling instruction material was performed in the experimental group and 2D CAD-based standard instruction material was taught in the control group. Experimental treatment was conducted on the students of construction specialized vocatinonal high school, and applied to the subject of Professional Drafting in the 12 hours. Before and after the experimental treatment, the interest and task performance ability on Housing Design were tested. Based on the test results, we analyzed the effects of the 3D modeling instruction material through the independent samples t-test. The results of the study are as follows. First, BIM-based 3D modeling instruction material was developed of 'Housing Design & Drafting' unit on the subject of Professional Drafting in construction specialized vocational high school. Second, the application of 3D modeling instruction material has shown to be effective in improving students' interest. Third, the application of 3D modeling instruction material has shown to be effective in improving students' task performance ability on Housing Design.

A Study on the Educational Programs for Experimental Typography (실험 타이포그래피의 교육 프로그램 연구)

  • 원유홍
    • Archives of design research
    • /
    • v.13 no.2
    • /
    • pp.33-44
    • /
    • 2000
  • Typography is the field be needed the most emotional and potential originality in the visual designers works. The design process introduced by aesthetic results is depended on a designers sensibility and originality. Accordingly this study includes more detail suggestions for mental switchover and developing whole area of sense and its education which make more sincere and easy communication of sentences in typographic and messages, removing fixed ideas, that are, prejudice and preconception, is one of big problems in making originality through the educational programs for experimental typography approaching with a new vision. Today, the change of typographic environment carried the substance and effectiveness of traditional typography be suspected and new ways are growing fast to escape from these traditional value. This study introduces some education programs such as Typortrait, Typeface, Typographic Essay, Kinetic Typography to realize the experimental typography to meet a new stream and social needs under the situation of exoplosive change and harmony fairly with proposition of coexisting of inspiration and technology, and finally expected to develop and promote typography experiment newly and to make educational section understand and confirm them.

  • PDF