D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Constant Speed

Date : 2001-07-27
Personnel : S.C., B.S. & M.H.
Temperature (°F) : 70 Humidity (%) : 37
Wind Speed (mph) : Wind Direction : Calm
Barometric Pressure (in.Hg) : 30.3
Verify that microphone height is 4 feet, wind speed is less than 12 mpg and ambient temperature is between 30 F and 90 F: true checked by S.C.
Initial Sound Level Meter Calibration: false checked by S.C.
Exterior Ambient Noise Level dB(A): 34.0

Accelerating from Constant Speed
Curb (Right) Side
Accelerating from Constant Speed
Street (Left) Side
Run # Measured Noise Level dB(A) Run # Measured Noise Level dB(A)
1 80.0 1 79.2
2 79.2 2 79.1
3 78.1 3 79.3
4 79.0 4 79.7
5 79.1 5 79.2
Average of two highest actual noise levels = 79.6 dB(A) Average of two highest actual noise levels = 79.5 dB(A)