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Shock and Vibration
Volume 2014, Article ID 473720, 11 pages
Research Article

Constrained Layer Damper Modelling and Performance Evaluation for Eliminating Squeal Noise in Trams

1CEIT and Tecnun, University of Navarra, Manuel de Lardizabal 15, 20018 San Sebastián, Spain
2CEIT, Manuel de Lardizabal 15, 20018 San Sebastián, Spain
3CAF, Jose Miguel Iturrioz 26, 20200 Beasain, Spain

Received 9 October 2013; Accepted 6 February 2014; Published 4 March 2014

Academic Editor: Peijun Xu

Copyright © 2014 Inaki Merideno et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents the modelling and design of a constrained layer damper to eliminate squeal noise in a particular tram. Even though resilient wheels are installed in every bogie, squeal noise is generated at the frequency of 780–800 Hz due to the small radius curves that the tram has to draw. Tuned constrained layer dampers provide a solution to this particular problem. Butyl rubber is chosen as the viscoelastic material for the damper, and conventional steel is used for the metallic sheets. The modelling approach and the final design of the damper are presented, together with evaluation of its performance in a real application. Experimental measurements on track have demonstrated that the constrained layer damper is properly tuned to the squealing frequency and that there is a significant reduction in noise when the proposed damper is attached to the wheels.