• Title/Summary/Keyword: 하우징

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Wide Bandwidth RFID Tag Antenna Design for Protection of Connection Part between Chip and Antenna (칩과 안테나 사이 연결부 보호를 위한 RFID 태그 안테나의 광대역 설계)

  • Lee, Ji-Chul;Min, Kyeong-Sik
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.2
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    • pp.154-160
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    • 2009
  • This paper describes a wide bandwidth RFID tag antenna design for protection of connection part between chip and antenna. A proposed tag antenna size, a resonant frequency and bandwidth are $53{\times}10{\times}1\;mm$, 900 MHz and 800 MHz($500{\sim}1,300\;MHz$) at -10 dB below, respectively. The dielectric materials with different relative permittivity such as polyethylene, glass and silicon were applied for protection of connection part between the proposed antenna and chip on the way of whole and partial housing. The measured return loss and radiation pattern agreed well with the calculation results. The read range of the proposed tag antenna without any housing and of tag antenna with housing covered over all by silicon with 3 mm thickness were observed about 5 m and 4 m, respectively.

Production Process Development and Prototype Evaluation for Roller Tappet Housing of Valvetrain (밸브트레인용 롤러태핏 하우징의 제작 공정 개발 및 시제품 평가)

  • Gwak, Eun-Jo;Park, Sung-Young
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.11
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    • pp.223-229
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    • 2016
  • In this study, a cold forging process was developed for the roller tappet housing of an engine valvetrain system. A tappet sample was manufactured and subjected to an endurance test. The material properties were obtained from a compression test, and forging analysis was carried out to design a forging process using a commercial program, Deform-3D. The forging process was set up based on the analysis results, and a die set and sample tappet housing were manufactured. To evaluate the sample, the dimensional accuracy, surface roughness, parallelism, and concentricity were measured and confirmed. To evaluate the actuation and durability, a special test rig was developed to simulate the valvetrain system of the engine. An actuation test was performed based on the idle speed of a general diesel engine, and an endurance test was done based on the maximum speed. The results show minor wear of 0.002 mm. The developed test rig will be used to evaluate the actuation and durability of other valvetrain parts.

Failure Analysis on Scale Formation of Thermostat Housing and Development of Accelerated Test Methodology (써모스타트 하우징의 침전물 생성에 관한 고장분석 및 가속시험법 개발)

  • Cho, In-Hee;Hyung, Sin-Jong;Choi, Kil-Yeong;Weon, Jong-Il
    • Applied Chemistry for Engineering
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    • v.20 no.2
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    • pp.177-185
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    • 2009
  • The failure analysis of scales deposited on automotive thermostat housing has been carried out. Observations using energy dispersive spectroscopy and electron probe micro analyzer indicate that the main components of scales are some of additives of coolant used. For a detailed investigation of organic matters pyrolysis-GC/MS is employed. The result shows that the main organic component is benzoic acid and furthermore, a small amount of acetophenone, benzene and phenyl group is detected. Based on the results of failure analysis performed, the scales on automotive thermostat housing appear due to the deposition of coolant components, followed by crevice corrosion, into gap between housing and rubber horse. New accelerated test methodology, which could mimic the scale formation and the crevice corrosion on thermostat housing, is developed considering the above results. In order to reproduce the real operating conditions, the accelerating factors, i.e. temperature and humidity, are changed and programmed. The reproducibility of the accelerated test proposed is confirmed after analyzing the scales obtained from the accelerated test.

Optimum Shape Design of Gearbox Housing for 5MW Wind Turbines (5MW급 풍력발전기용 기어박스 하우징의 형상 최적설계)

  • Jeong, Ki-Yong;Lee, Dae-Yeon;Choi, Eun-Ho;Cho, Jin-Rea;Lim, O-Kaung
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.25 no.3
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    • pp.237-243
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    • 2012
  • The thickness optimization of the gearbox housing for 5MW wind turbine is carried out with the help of the efficient structure analysis model and the approximation model of objective function. Wind turbine gearbox is a complex structural system composed of a number of gear trains, shafts, bearing and gearbox housing, requiring a tremendous number of elements for the structural analysis and design. In this paper, an effective analysis and design model considering the tooth stiffness of helical gears is proposed. It enables to significantly reduce the total element number and the analysis time. Through the numerical optimization of housing thickness making use of the effective gearbox model and the approximate model of objective function, the total weight of the gearbox housing is minimized. It has been observed from the numerical experiment that the approximation model is reliable and the optimization result is acceptable and verified analysis.