Noise measurements of a passing train at a distance 7.5 m from the middle of the track indicate that the rolling of the wheels over a straight, long welded rail without corrugations produces a noise with a broad-frequency spectrum. This is mainly radiated by the wheels, the rail and the structure (viaducts, bridges and tunnels). The conclusion to be drawn from the investigations of P.J. Remington are that in the noise, the wheel dominates in the sound radiation at the low frequencies, and the rail dominates over the rest of the frequencies. The physical explanation is that at low frequencies the wheel impedance rises as the frequency to the first power, which will be similar to the frequency dependence of a simple mass. For the rest of the frequencies the rail impedance agrees with the impedance of a simple beam-in-bending. In the low frequencies dips in the impedance result from the rail resonance on the foundation, as the rail is a very inefficient radiator at these low frequencies; the frequencies around 100 Hz can only be radiated by a large construction like a viaduct or bridge.

Media Info

  • Pagination: p. 771-774

Subject/Index Terms

Filing Info

  • Accession Number: 00189746
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: May 11 1979 12:00AM