Technical Reports

Noise Assessment and Abatement in Rapid Transit Systems

  • 01
  • Sep
  • 1974
AUTHOR: L.G. Kurzweil, R. Lotz, E.G. Apgar
SUBJECT: Train Horn Noise
KEYWORDS: Noise, Rapid Transit, Transportation Noise, Rail Vehicle Noise, Noise Assessment, Noise Abatement, Noise Control
ABSTRACT: As Systems Manager for the Urban Rail Supporting Technology Program sponsored by the Rail Programs Branch of the Urban Mass Transportation Administration, the Transportation Systems Center is conducting an effort in Urban Rail Noise Abatement. A portion of this effort, described herein, is concerned with the assessment of noise and of the potential for noise abatement on existing U.S. transit properties. A methodology is described for assessing the noise climate and for selecting the combination of abatement techniques which reduces the existing noise to user specified levels for minimum cost. This methodology, developed in a pilot study of the Massachusetts Bay Transportation Authority (MBTA) rapid transit lines, takes into account the large number of interrelated acoustic and economic considerations present in rail transit systems. The various noise receivers include riders and operating personnel in cars and stations, and individuals in the wayside community. Noise sources include several types of wheel-rail noise, propulsion, power pick-up, auxiliary equipment and braking noise. Noise propagation paths include airborne and structure-borne components establishing both direct and reverberant sound fields in tunnels, stations, transit cars, and communities. In the pilot application to the MBTA, minimum-cost noise control options were determined for noise level goals in the range 75 to 90 dBA.