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
