CALCULATION OF NOISE CHARTS

BERECHNUNG VON LAERMKARTEN

In order to calculate the distribution of noise in built-up areas, a computer program has been developed for the Bavarian State Ministry for Land Development and the Environment, with which noise charts can be produced. The computing process takes account of non-static sources of noise (vehicles, aeroplanes) and static sources (the noise of construction and industry, sirens, etc). In particular, various classes of vehicles are differentiated (passenger cars, heavy goods vehicles, motor cycles, railways). Equally, the limiting factors relating specifically to the roads, such as right-of-way regulations, gradient and road surface are considered. The position and ground plans of buildings and walls, as well as differences in the ground level, all of which are relevant for the pattern of sound distribution, are extracted from flood charts and computerized. The heights of the sound buffers, where they cannot be obtained from municipal data, are, like the structure of the walls of houses, found by reconnaissance. These data are used to calculate the reflection, screening and absorption by obstacles. In the same way, the spectral atmospheric absorption is taken into consideration. The program was tested for practicability and accuracy by means of control measurements. Calculations and measurements of town districts with a total area of approximately 10 sq km were made. The districts chosen were industrial areas, old quarters, areas with tall buildings, residential suburbs, main thoroughfares and health resorts. The average calculation and measurement deviation in over 200 random samples is 2.6 db(a). A proportion of the deviations can be traced back to circumstances beyond the control of the program, such as exceeding the speed limits, inaccurate measurements and statistical fluctuations. /TRRL/

  • Corporate Authors:

    VDI Nachrichten

    Postfach 1139, Graf-Recke-Strasse 84
    4 Dusseldorf 1,   Germany 
  • Authors:
    • Bschorr, O
  • Publication Date: 1978-4

Language

  • German

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 111-113
  • Serial:
    • Umwelt
    • Volume: 8
    • Issue Number: 2
    • Publisher: VDI Nachrichten

Subject/Index Terms

Filing Info

  • Accession Number: 00301141
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Nov 7 1979 12:00AM