The degree to which it is possible to attenuate the effects of pressure pulses on the passengers in trains entering tunnels by modifying the normally abrupt portal of a constant-diameter single track tunnel was investigated. Although the suggested modifications to the tunnel entrance portal may not appreciably decrease the magnitude of the pressure rise, they are very effective in reducing the discomfort to the human ear by substantially decreasing the rate of pressure rise to that which the normal ear can accommodate. Qualitative comparison was made of this portal modification approach with other approaches: decreasing the train speed or sealing the cars. The optimum approach, which is dependent upon the conditions and requirements of each particular rail system, is likely to be the portal modification one for a rapid rail mass transit system.


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    Titel :

    Alleviation of pressure pulse effects for trains entering tunnels. Volume 1: Summary


    Beteiligte:
    Dayman, B., Jr. (Autor:in) / Hammitt, A. G. (Autor:in) / Holway, H. P. (Autor:in) / Tucker, C. E., Jr. (Autor:in) / Vardy, A. E. (Autor:in)

    Kongress:

    Intern. Symp. on the Aerodyn. and Ventilation of Vehicle Tunnels ; 1979 ; Sheffield


    Erscheinungsdatum :

    01.06.1979


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Alleviation of Pressure Pulse Effects for Trains Entering Tunnels. Volume 1: Summary

    B. Dayman / A. G. Hammitt / H. P. Holway et al. | NTIS | 1979


    Aerodynamic Effects Caused by Trains Entering Tunnels

    Liu, T.-h. / Tian, H.-q. / Liang, X.-f. | British Library Online Contents | 2010




    Communication with moving trains in tunnels

    Monk, N. / Winbigler, H.S. | Engineering Index Backfile | 1956