Accession Number : AD0701220

Title :   NOISE GENERATED BY SUBWAYS ABOVEGROUND AND IN STATIONS.

Descriptive Note : Technical rept.,

Corporate Author : BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS

Personal Author(s) : Bender,Erich K. ; Heckl,Manfred

Report Date : JAN 1970

Pagination or Media Count : 64

Abstract : The report presents and discusses subway noise data acquired near various outdoor subways in seven European cities as well as noise generated by trains entering and leaving nine subway stations. Outdoor noise is measured at distances between 3 and 300 feet. It was found that there are substantial variations (of the order of 20-30 dB) in levels generated by trains at a given distance on elevated sections, depending on whether the supporting structure is steel, concrete, or earthen. Rail joints and poor quality wheels are shown to increase noise levels by 8-10 dB. Trains on rails which have been ground smooth generate 6dB(A) less noise than trains on unground rails. Effects of train speed, distance from a train, and track grade are analyzed. Finally, noise levels in small stations lacking significant sound-absorbing surfaces are found to be 22 dB(A) higher than larger acoustically well-treated stations. (Author)

Descriptors :   (*RAILROADS, *NOISE), (*VEHICLE WHEELS, NOISE), RAILROAD TRACKS, SURFACE ROUGHNESS, ACOUSTIC PROPERTIES, PROPAGATION, METAL JOINTS, ACOUSTIC INSULATION, DAMPING, WEST GERMANY, GREAT BRITAIN, FRANCE, NETHERLANDS, SWEDEN, SPAIN

Subject Categories : Surface Transportation and Equipment
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE