Super Resilient Rail Fixation Systems to Reduce Squeal Noise, Vibration, and Rail Corrugation

This paper describes how Metros running in a tunnel generate vibrations that propagate, through the soil to nearby buildings, causing vibrations and/or ground borne noise inside these buildings. This is aggravated by vehicles running over corrugated rails. Light rail cars running in streets through tight curves generally produce wheel squeal that can reach significant noise levels in the environment. In order to find solutions at track level to reduce these annoyances, a complete dynamic study of these phenomena was carried out under the EC research programs SQUEAL and CORRUGATION. These studies are based on site measurements and numerical simulations. This has lead to the development of a resilient pre-loaded rail fixation system (APT-ST system). It significantly reduces noise and vibration at the source whilst maintaining track stability. A super resilient pre-loaded fastener has been further developed, enabling them to obtain a very low dynamic stiffness for the complete rail fixation system (APT-BF system). The very low dynamic stiffness is obtained by using very resilient base plate pads and by ensuring a complete unloading of the preloading springs during vehicle passage. Three applications of these resilient preloaded rail fixation systems are discussed: squeal noise reduction in a paved light rail track, superior vibration mitigation in a metro tunnel (New-York) and corrugation growth reduction in a curved metro track. It is demonstrated that these resilient fastener solutions exhibit similar noise and vibration mitigation behavior as the most effective classical solutions (floating slabs, noise barriers) at a fraction of their cost: component costs, installation costs and maintenance costs are drastically reduced. This makes these resilient fasteners very valuable alternatives to floating slabs, noise barriers.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures;
  • Pagination: 8p
  • Monograph Title: Rail Transit Conference Proceedings, 2005

Subject/Index Terms

Filing Info

  • Accession Number: 01002171
  • Record Type: Publication
  • ISBN: 1931594155
  • Files: TRIS
  • Created Date: Jul 19 2005 10:07AM