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Prediction of noise changes due to traffic speed control
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10.1121/1.2769972
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Affiliations:
1 Institute of Acoustics, A. Mickiewicz University, 61-614 Poznan, Umultowska 85, Poland
a) Author to whom correspondence should be addressed. Electronic mail: makaaku@amu.edu.pl
J. Acoust. Soc. Am. 122, 2074 (2007)
/content/asa/journal/jasa/122/4/10.1121/1.2769972
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/4/10.1121/1.2769972

## Figures

FIG. 1.

A road consists of three cruise segments (with the vehicle speeds , , and the A-weighted sound exposures , , ), deceleration segment (with ) and acceleration segment (with ).

FIG. 2.

Distance (Eq. 6) between the vehicle and the receiver .

FIG. 3.

Noise reduction at the height , calculated for the hard ground in Japan , with the traffic speeds and , where the road segment length .

FIG. 4.

Noise reduction at the height , calculated for the soft ground in Japan , with the traffic speeds and , where the road segment length .

FIG. 5.

Noise reduction at the height , calculated for the hard ground in Poland , with the traffic speeds and , where the road segment length .

FIG. 6.

Noise reduction at the height , calculated for the soft ground in Poland , with traffic speeds and , where the road segment length .

FIG. 7.

Noise reduction at the height , calculated for the soft ground with the emission characteristic , traffic speeds and , where the road segment length .

FIG. 8.

Noise reduction at the height , calculated for the soft ground with the emission characteristics, , and steady speeds , , where the road segment length .

FIG. 9.

The critical length as the function of the noise emission characteristic, , for the traffic speeds (, ), (, ), and (, ). The required deceleration rates, , and acceleration rates, , have been taken from Tables I and II.

## Tables

TABLE I.

Automobile deceleration rate for the steady speed and the reduced speed (see Ref. 29).

TABLE II.

Automobile acceleration rate for the steady speed and the reduced speed (see Ref. 29).

TABLE III.

Critical lengths and of the road segment (with the reduced speed ) calculated from Eq. (58) and Tables I and II), for automobiles driving in Japan and in Poland .

/content/asa/journal/jasa/122/4/10.1121/1.2769972
2007-10-01
2014-04-21

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