Wave Attenuation of a PreTensioned Wire with Periodic Spring Supports Subjected to a Moving Force

doi:10.1142/S0219455420710091

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Title:	Wave Attenuation of a PreTensioned Wire with Periodic Spring Supports Subjected to a Moving Force
Authors:	Yang, Y. B.;Yau, J. D.;Urushadze, S.
Keywords:	Band gap;catenary;pantograph;periodic structure;resonator;unit cell;wave propagation.
Date:	2020-09-29
Issue Date:	2021-02-24 12:12:16 (UTC+8)
Publisher:	World Scientics
Abstract:	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.
Relation:	International Journal of Structural Stability and Dynamics 20(11), 2071009
DOI:	10.1142/S0219455420710091
Appears in Collections:	[Graduate Institute & Department of Civil Engineering] Journal Article

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