Motor Racing Vehicles - Measurement Methods
3 Speedway – Gravel Track
Location
Slangerup Speedway
Date
99.05.22
Vehicle
One 500 cc-class, 3 different exhaust silencers, 4 passbys each
Microphone
1.5 m above ground (at security fence), 8.5 m from actual racing
line
Speed
Average driving speed on measurement section of track: 24 m/s
Frequency (Hz)
63
125
250
500
1k
2k
4k
8k
Total
LWA1 (dB re. 1pW)
99.7
112.
5
124.
2
130.
9
123.
1
122.
4
119.
8
118.
0
133.1
LpAmaxF1 (dB re. 20µPa)
-
-
-
-
-
-
-
-
102.3
LWA2 (dB re. 1pW)
99.7
112.
3
124.
0
131.
5
123.
6
121.
9
119.
6
118.
0
133.5
LpAmaxF2 (dB re. 20µPa)
-
-
-
-
-
-
-
-
102.5
LWA3 (dB re. 1pW)
102.
3
114.
1
126.
1
135.
9
127.
3
126.
8
125.
3
120.
2
137.6
LpAmaxF3 (dB re. 20µPa)
-
-
-
-
-
-
-
-
105.9
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