D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Constant Speed

Date : 2006-06-20
Personnel : B.S., T.S. and S.C.
Temperature (°F) : 72 Humidity (%) : 54
Wind Speed (mph) : 5 Wind Direction : w
Barometric Pressure (in.Hg) : 29.97
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): 44.7

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 76.7 1 77.7
2 77.4 2 77.4
3 76.3 3 77.4
4 76.3 4 77.0
5 76.1 5 77.8
Average of two highest actual noise levels = 77.1 dB(A) Average of two highest actual noise levels = 77.8 dB(A)