• Title/Summary/Keyword: Scale of vacuum

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Study on the Enhancement of the Uniform Contact Technology for Large Scale Imprinting with the Design of Vacuum Gripping Pad (진공척 흡착패드 형태에 따른 대면적 임프린팅 균일 접촉 향상 연구)

  • Jang, Si-Youl
    • Tribology and Lubricants
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    • v.24 no.6
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    • pp.326-331
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    • 2008

  • The contact surfaces between mold and target should be in parallel for a proper imprinting process. However, large size of contacting area makes it difficult for both mating surfaces (mold and target planes) to be in all uniform contact with the expected precision level in terms of thickness and position. This is caused by the waviness of mold and target although it is very small relative to the area scale. The gripping force for both mold and target by the vacuum chuck is other major effect to interrupt the uniform contact, which must be avoided in imprinting mechanism. In this study, the cause of non-conformal contact mechanism between mold and target is investigated with the consideration of deformation due to the vacuum gripping for the size $470{\times}370\;mm^2$ LCD panel.

  • https://doi.org/10.9725/kstle.2008.24.6.326 인용 PDF KSCI

The use of small scale model testing to compare connection methods of steel purlins

  • Urquhart, Stephen M.;Kavanagh, Kenneth T.
    • Structural Engineering and Mechanics
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    • v.6 no.5
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    • pp.571-582
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    • 1998

  • Testing of steel roof purlins is usually performed on full scale models in large vacuum test rigs. To undertake a comparison between web cleat connected purlins and flange bolted purlins a series of tests were performed on a 1:4 small scale model vacuum test rig. Various modelling issues need to be addressed to ensure reasonable comparison with actual constructed roof framing methods but still be suitable for an economical comparison between the connection methods. Model test results were supported by, and found to be in reasonable agreement with, deflection predictions from computer models based on finite element methods. This paper discusses the testing methods adopted and the value of small scale model testing programs as a means of obtaining comparisons between framing options.

  • https://doi.org/10.12989/sem.1998.6.5.571 인용