INVESTIGATION OF THE ROLLING NOISE SOURCES ON THE TRAM OF NANTES WITH A MICROPHONE ARRAY

As part of a research program on the acoustic emission of ground transportation, the tram of Nantes has been investigated. In relation with the development of a noise model of the tram, microphone array measurements have been achieved. Rolling noise being the main noise source, the investigations aimed at pointing out noise differences between driving bogies and bearing bogies, as well as the influence of the track construction. The measurement and processing involved an horizontal line array with focussing and dedopplerization. Acoustic cartographies for each pass-by of the tram in third-octave bands were drawn. Tram constant speeds spread from 10 to 50 km/h. Some accelerating runs were also measured. Three types of track construction were tested: classical track (concrete bed with absorbing pads between the rails and the sleepers), floating slab on a bridge, rails on ballast. Measurements of squeal noise in a curve were also achieved. The classical track appears to be the less noisy, with very few contribution of the rail except at higher speed. The measurements on the bridge show mainly the vibration of the whole structure, hiding even the pass-by of the wheels at lower frequencies. For the track on ballast, the contribution of the rail arises clearly and the rail may radiate even higher as the tram is leaving than between bogies. The contribution of each noise source can be estimated. (A) For the covering abstract see ITRD E113232.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/980655414
• Corporate Authors:

  CONGRESS SECRETARIAT

  VOORWEG 105-A
  ZOETERMEER,   Netherlands  NG 2715
• Authors:
  • PALLAS, M-A
  • LELONG, J
• Conference:
  • INTER-NOISE 2001 - ABSTRACTS FROM INTERNATIONAL CONGRESS AND EXHIBITION ON NOISE CONTROL ENGINEERING
  • Location: THE HAGUE , Netherlands
  • Date: 2001-8-27 to 2001-8-30
• Publication Date: 2001

Language

• English

Media Info

• Features: References;
• Pagination: p. 2127-32

Subject/Index Terms

• TRT Terms: Bridges; Conferences; Measurement; Noise; Pollutants; Railroad tracks; Railroad transportation; Speed; Trolley cars
• ITRD Terms: 3455: Bridge; 8525: Conference; 2442: Emission; 6136: Measurement; 2492: Noise; 1173: Rail bound transport; 1062: Railway track; 5408: Speed; 1284: Tram
• Subject Areas: Bridges and other structures; Environment; Railroads;

Filing Info

• Accession Number: 00928673
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 9-806554-1-4
• Files: ITRD
• Created Date: Aug 2 2002 12:00AM