D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Standstill

Date : 2001-07-27
Personnel : S.C., B.S. & M.H.
Temperature (°F) : 72 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: true checked by S.C.
Exterior Ambient Noise Level dB(A): 34.6

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 83.8 1 82.2
2 83.7 2 81.3
3 83.7 3 83.0
4 82.0 4 83.1
5 82.5 5 81.6
Average of two highest actual noise levels = 83.8 dB(A) Average of two highest actual noise levels = 83.1 dB(A)