Picture of neon light reading 'Open'

Discover open research at Strathprints as part of International Open Access Week!

23-29 October 2017 is International Open Access Week. The Strathprints institutional repository is a digital archive of Open Access research outputs, all produced by University of Strathclyde researchers.

Explore recent world leading Open Access research content this Open Access Week from across Strathclyde's many research active faculties: Engineering, Science, Humanities, Arts & Social Sciences and Strathclyde Business School.

Explore all Strathclyde Open Access research outputs...

An investigation into the mechanical damping characteristics of catenary contact wires and their effect on aerodynamic galloping instability

Stickland, M.T. and Scanlon, T.J. and Craighead, I.A. and Fernandez, J. (2003) An investigation into the mechanical damping characteristics of catenary contact wires and their effect on aerodynamic galloping instability. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 217 (2). pp. 63-71. ISSN 0954-4097

[img]
Preview
Text (strathprints004991)
strathprints004991.pdf - Accepted Author Manuscript

Download (393kB) | Preview

Abstract

Measurement of the damped oscillation of a section of the UK East Coast Main Line (ECML) catenary/contact wire system was undertaken, and the natural frequency and mechanical damping were found to be 1.4Hz and 0.05 respectively. This information was used to assess the effect of increasing the mechanical damping ratio on the susceptibility of the system to an aerodynamic galloping instability. The section of line tested was known to gallop at wind speeds of approximately 40 mile/h, and theoretical and experimental work verified this. A friction damper arm was designed and three units were fitted to the section of line affected. The introduction of increased mechanical damping was found to raise the mechanical damping coefficient of the line to between 0.095 and 0.18, and the mathematical analysis produced a theoretical wind speed for galloping oscillation of between 75 and 141 mile/h respectively. For over a year since the units were fitted, no problems with galloping instability have been observed.