• Title, Summary, Keyword: Vibration-proof fastening system

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Evaluation of the Performance Test Load through the Estimation of Vertical Loads on Vibration-Proof Fastening Systems (방진체결장치에 작용하는 수직하중 평가를 통한 성능시험하중 평가)

  • Yang, Sin Chu
    • Journal of the Korean Society for Railway
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    • v.19 no.6
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    • pp.777-784
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    • 2016
  • In this study, regulation of the performance test load of a vibration-proof fastening system used in urban railways was established through evaluation of the loads that it bears in the field. In order to investigate the range of the dynamic stiffness of the vibration-proof fastening system, dynamic stiffness tests were carried out for three types of vibration-proof fastening system that can be domestically supplied. Train and track interaction analyses in the frequency domain were carried out to evaluate the dynamic wheel loads. The track irregularity, which is a very important input factor in train and track interaction analysis, was considered as a PSD (Power Spectral Density) function, which was derived based on the measured data. The loads on the vibration-proof rail fastening system were evaluated considering various operating conditions in the urban railway. Regulation of the performance test load of the vibration-proof rail fastening system was established based on the evaluated loads.

An Experimental Study on the Evaluation of Fastening Unit Insulation Developed for the Insulation of Curtain Wall

  • Kim, Bong-Joo;Kim, Kyeong-A
    • Journal of the Korea Institute of Building Construction
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    • v.12 no.2
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    • pp.243-256
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    • 2012
  • This study is the experimental study to improve the insulation of the fastening unit system, which has the most vulnerable insulation in the curtain walls. The Fastening Units were designed and fabricated to minimize the connection part of mullions. In addition, slight movements were taken into account and the performance of the middle layer was evaluated by forming an insulation layer with the vibration-proof rubber and the silicon to satisfy the mechanical and thermal performance criteria. A total of 10 experiments were performed under various conditions, such as indoor-outdoor temperature difference, type of insulation material, thickness of insulation material, and others. using the fabricated Fastening Units. As a result, the vibration-proof rubber insulation showed the temperature difference of $2.2^{\circ}C-5.0^{\circ}C$, and the silicon insulation showed the temperature difference of $2.8^{\circ}C-4.5^{\circ}C$, compared to the non-insulated Fasteniirature difference, typesng Units. When these results were compared with the psychometric chart graph, the insulated Fastening Unit designed in this study can be considered to prevent the dew condensation.