Outdoor noise measurements compared with predictions by Nordic models

Tapio Lahti

Research output: Book/ReportReport

Abstract

Outdoor noise measurements of road traffic at 16 sites, rail traffic at 7 sites, and of two large industrial sources are reported. The measured sound levels are compared with the levels calculated by the respective Nordic prediction models. The prediction of the equivalent level of road traffic noise was very accurate: the mean prediction error was less than 0.5 dB. The maximum level predictions were obviously worthless. The rail traffic noise comparisons contain three sets of data: 228 train passings of the Finnish measurements and additional Danish and Norwegian measurement data with 529 train passings. The rail traffic noise model was shown to be reasonably accurate. The mean prediction error for the sound exposure level was less than 1 dB and the internal bias between exposure and maximum levels in the model was 1 to 2 dB. Tentative values for the necessary train type corrections are given for some Nordic types. The results of the industrial noise comparison were not satisfactory, which reflect the various problems encountered with large sources and propagation to long distances. Advanced signal processing and propagation calculation techniques were applied for checking the results. These showed that results with an apparently good agreement may in fact be unreliable due to contamination by background.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages70
ISBN (Print)951-38-1988-4
Publication statusPublished - 1984
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tiedotteita
Number300
ISSN0358-5085

Fingerprint

noise measurement
traffic
rails
predictions
roads
propagation
acoustics
signal processing
contamination

Keywords

  • outdoor noise
  • measurements
  • traffic noise
  • mathematical models

Cite this

Lahti, T. (1984). Outdoor noise measurements compared with predictions by Nordic models. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tiedotteita, No. 300
Lahti, Tapio. / Outdoor noise measurements compared with predictions by Nordic models. Espoo : VTT Technical Research Centre of Finland, 1984. 70 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 300).
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Lahti, T 1984, Outdoor noise measurements compared with predictions by Nordic models. Valtion teknillinen tutkimuskeskus. Tiedotteita, no. 300, VTT Technical Research Centre of Finland, Espoo.

Outdoor noise measurements compared with predictions by Nordic models. / Lahti, Tapio.

Espoo : VTT Technical Research Centre of Finland, 1984. 70 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 300).

Research output: Book/ReportReport

TY - BOOK

T1 - Outdoor noise measurements compared with predictions by Nordic models

AU - Lahti, Tapio

PY - 1984

Y1 - 1984

N2 - Outdoor noise measurements of road traffic at 16 sites, rail traffic at 7 sites, and of two large industrial sources are reported. The measured sound levels are compared with the levels calculated by the respective Nordic prediction models. The prediction of the equivalent level of road traffic noise was very accurate: the mean prediction error was less than 0.5 dB. The maximum level predictions were obviously worthless. The rail traffic noise comparisons contain three sets of data: 228 train passings of the Finnish measurements and additional Danish and Norwegian measurement data with 529 train passings. The rail traffic noise model was shown to be reasonably accurate. The mean prediction error for the sound exposure level was less than 1 dB and the internal bias between exposure and maximum levels in the model was 1 to 2 dB. Tentative values for the necessary train type corrections are given for some Nordic types. The results of the industrial noise comparison were not satisfactory, which reflect the various problems encountered with large sources and propagation to long distances. Advanced signal processing and propagation calculation techniques were applied for checking the results. These showed that results with an apparently good agreement may in fact be unreliable due to contamination by background.

AB - Outdoor noise measurements of road traffic at 16 sites, rail traffic at 7 sites, and of two large industrial sources are reported. The measured sound levels are compared with the levels calculated by the respective Nordic prediction models. The prediction of the equivalent level of road traffic noise was very accurate: the mean prediction error was less than 0.5 dB. The maximum level predictions were obviously worthless. The rail traffic noise comparisons contain three sets of data: 228 train passings of the Finnish measurements and additional Danish and Norwegian measurement data with 529 train passings. The rail traffic noise model was shown to be reasonably accurate. The mean prediction error for the sound exposure level was less than 1 dB and the internal bias between exposure and maximum levels in the model was 1 to 2 dB. Tentative values for the necessary train type corrections are given for some Nordic types. The results of the industrial noise comparison were not satisfactory, which reflect the various problems encountered with large sources and propagation to long distances. Advanced signal processing and propagation calculation techniques were applied for checking the results. These showed that results with an apparently good agreement may in fact be unreliable due to contamination by background.

KW - outdoor noise

KW - measurements

KW - traffic noise

KW - mathematical models

M3 - Report

SN - 951-38-1988-4

T3 - Valtion teknillinen tutkimuskeskus. Tiedotteita

BT - Outdoor noise measurements compared with predictions by Nordic models

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Lahti T. Outdoor noise measurements compared with predictions by Nordic models. Espoo: VTT Technical Research Centre of Finland, 1984. 70 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 300).