IN-SITU MEASUREMENT OF THE ACOUSTIC CHARACTERISTICS OF NOISE BARRIERS

MESURE IN SITU DE CARACTERISTIQUES ACOUSTIQUES DES ECRANS CONTRE LE BRUIT

This paper describes a method of evaluating the transmission, absorption and reflection characteristics of noise barriers, which was developed by the Laboratoire Centrales des Ponts et Chaussees (LCPC) in France; the method enables noise screens to be tested on site after installation. It has led to the definition of new minimum requirements for the manufacture of noise barriers in France; the paper also states these requirements. The method's objective is to control the satisfactory manufacture and installation of barriers along roads. The noise transmission measurement procedure is described in Standard S 31089 (1986) and is based on the analysis of an impulse signal from an alarm gun. The transmitter is an omnidirectional source, which supplies a sound pressure near 160 dB at a distance of 1 m for about 1 millisecond. Transmission, absorption and reflection are evaluated by analysing and comparing the reception of the impulse signals by two microphones at different positions. The results of these measurements can be used to verify whether a specific screen is built according to the new minimum requirements; the test can be carried out under actual conditions of use, and should enable the design of the screens to be optimised. The paper was originally published in French in the Congres Routes et Circulation Routiere pour l'An 2000, Berlin, September 1988.

  • Corporate Authors:

    Transport and Road Research Laboratory (TRRL)

    Wokingham, Berkshire  United Kingdom 
  • Authors:
    • Bar, P
  • Publication Date: 1988-8

Language

  • English

Media Info

  • Pagination: 9 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00606119
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: T 3457
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1991 12:00AM