D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Standstill

Date : 2008-04-09
Personnel : B.S. & T.S.
Temperature (°F) : 65 Humidity (%) : 60
Wind Speed (mph) : Calm Wind Direction : Calm
Barometric Pressure (in.Hg) : 30.09
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): 41.5

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 72.8 1 72.4
2 72.5 2 72.4
3 72.8 3 72.5
4 72.6 4 72.3
5 72.8 5 72.4
Average of two highest actual noise levels = 72.8 dB(A) Average of two highest actual noise levels = 72.5 dB(A)