INVESTIGATION INTO THE NOISE EMISSION OF OVERHEAD RAILWAYS

UNTERSUCHUNGEN DER GERAEUSCHABSTRAHLUNG VON HOCHBAHNEN

The noise emission from overhead railways in the vertical plane shows a reduction of about 5 to 7 dba independent of vehicle speed compared to the highest emission levels for angles between 0 deg and 30 deg from the horizontal and a reduction of about 8 dba to the area below 45 deg from the horizontal shielded by the fly-over structure. Vehicle speed has the greatest influence upon noise, so that an increase of 10 km/hour in the 20 km/hour to 60 km/hour band effects an increase of 4 to 5 dba in the noise level. Above 60 km/hour the noise increase per 10 km/hour speed increase is 1 to 3 dba less than at the lower speeds. With a tram system using rails set in an aggregate bed there is about 3 dba noise increase per 10 km/hour speed increase--a lower increase than for the Rotterdam metro (4 to 5 dba)--in the 22 km/hour to 50 km/hour band. Where both sides of an overhead railway are built up, the noise level on the eleventh floor of adjoining property rises by 3 to 5 dba. An increase in the clearance to each side of the structure, from 10 m to 20 m reduces the level of noise on the eleventh floor by 1 to 2 dba. In open areas, however, the noise reduction by doubling the clearance up to 25 M is 4 dba, from 25 M to 50 M it is 5 dba and at great distances the metro acts as a point noise source with 6 dba noise reduction for each doubling of the clearance. Trams with unground wheels on unground track emit up to 3 dba higher noise levels than the same with ground wheels on ground track.

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• Corporate Authors:

  VDI Nachrichten

  Postfach 1139, Graf-Recke-Strasse 84
  4 Dusseldorf 1,   Germany 
• Authors:
  • Buchta, E
• Publication Date: 1975-11

Language

• German

Media Info

• Features: Figures; References; Tables;
• Pagination: 72 p.
• Serial:
  • Fortschrift-Berichte der VDI-Zeitschriften
  • Issue Number: 22
  • Publisher: VDI Nachrichten
  • ISSN: 0506-3167

Subject/Index Terms

• TRT Terms: Acoustic measuring instruments; Acoustics; Noise; Operating speed; Railroad bridges; Railroad trains; Rapid transit; Sound level; Speed; Train operations
• Old TRIS Terms: Acoustic measurement; Rapid transit noise
• ITRD Terms: 4559: Coarse aggregate; 9009: Decrease; 1092: Freight terminal; 9149: Prevention; 6748: Sound; 6747: Sound level; 5408: Speed; 6255: Test; 1372: Wheel
• Subject Areas: Environment; Public Transportation; Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00170020
• Record Type: Publication
• Source Agency: Bundesanstalt für Straßenwesen (BASt)
• Report/Paper Numbers: Monograph
• Files: ITRD, TRIS
• Created Date: Jan 30 1981 12:00AM