D4500/D4505

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Constant Speed

Date : 2011-03-21
Personnel : C.S., T.S. & S.C.
Temperature (°F) : 63 Humidity (%) : 60
Wind Speed (mph) : 8 Wind Direction : WSW
Barometric Pressure (in.Hg) : 29.87
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): 49.8

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 72.9
2 72.6 2 73.0
3 74.5 3 72.2
4 73.2 4 72.5
5 73.6 5 72.7
Average of two highest actual noise levels = 74.1 dB(A) Average of two highest actual noise levels = 73.0 dB(A)