D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Constant Speed

Date : 2004-11-11
Personnel : T.S., S.C., and R.C.
Temperature (°F) : 56 Humidity (%) : 45
Wind Speed (mph) : 8 Wind Direction : sw
Barometric Pressure (in.Hg) : 30.1
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): 43.6

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 72.8 1 72.4
2 74.6 2 75.5
3 73.0 3 73.8
4 73.5 4 74.8
5 74.0 5 74.4
Average of two highest actual noise levels = 74.3 dB(A) Average of two highest actual noise levels = 75.2 dB(A)