Motor Racing Vehicles - Measurement Methods
1/1-Octave
frequency [Hz]
Soil tracks
Gravel tracks
Asphalt tracks
Microphone
pos:
soft surface
soft surface
soft surface
hard surface
average st.dev. average st.dev. average st.dev.
average
63
4.1
0.9
5.2
0.2
5.0
0.7
4.3
125
3.7
0.8
4.7
0.2
5.1
0.3
9.6
250
1.2
1.5
2.3
0.7
4.3
0.8
4.1
500
-4.2
2.0
-1.1
0.3
1.3
2.1
1.1
1000
-0.9
3.1
1.4
0.3
-0.7
3.4
0.5
2000
0.1
0.6
1.2
0.4
1.0
0.8
3.7
4000
-0.2
0.7
1.1
0.4
0.5
1.4
1.5
8000
-0.1
0.7
0.4
0.5
1.3
0.7
1.2
Table 1. Ground corrections for declaration purposes Lgd in dB
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