D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Constant Speed

Date : 2015-06-10
Personnel : S.R., E.D. & R.S.
Temperature (°F) : 70 Humidity (%) : 66
Wind Speed (mph) : 6 Wind Direction : SW
Barometric Pressure (in.Hg) : 29.9
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 E.D.
Initial Sound Level Meter Calibration: true checked by E.D.
Exterior Ambient Noise Level dB(A): 41.6

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 76.5 1 78.5
2 76.5 2 78.0
3 76.9 3 74.9
4 76.9 4 76.8
5 76.1 5 76.2
Average of two highest actual noise levels = 76.9 dB(A) Average of two highest actual noise levels = 78.3 dB(A)