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    題名: Wave Attenuation of a PreTensioned Wire with Periodic Spring Supports Subjected to a Moving Force
    作者: Yang, Y. B.;Yau, J. D.;Urushadze, S.
    關鍵詞: Band gap;catenary;pantograph;periodic structure;resonator;unit cell;wave propagation.
    日期: 2020-09-29
    上傳時間: 2021-02-24 12:12:16 (UTC+8)
    出版者: World Scientics
    摘要: The pantograph-catenary system is essential to the operation of modern railways. The overhead
    catenary system serves to deliver steady electric power to the trains running on the railways.
    The propagation of waves in the catenary system can be signi¯cantly a®ected by its interaction
    with the pantograph. To investigate the wave transmission via the contact wires of a catenary
    system, a simpli¯ed model composed of a pre-tensioned wire suspended by periodic spring
    supports is adopted. For a periodic structure with wider band gaps (or stop bands), a larger
    cluster of frequencies of the transmitting waves can be ¯ltered out. This is bene¯cial to the
    maintenance of the catenary system as unwanted vibrations have been reduced. To widen the
    band gaps, a resonator can be equipped on each of the spring supports for attenuation of a wider
    range of transmitting waves in the pre-tensioned wire. In this study, a unit cell conceived as the
    spring–resonator–wire unit is adopted to formulate the dispersion equation in closed form, from
    which the critical condition for widening the band gaps is derived. In addition, the moving
    pantograph is modeled as a moving force. From the exemplar study, it was shown that the
    installation of proper resonators on a catenary system can increase the gap bandwidth, such
    that the pantograph-induced wave transmission in the contact wires will be attenuated or
    filtered out.
    關聯: International Journal of Structural Stability and Dynamics 20(11), 2071009
    DOI: 10.1142/S0219455420710091
    顯示於類別:[土木工程學系暨研究所] 期刊論文

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