D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Standstill

Date : 2015-06-10
Personnel : S.R., E.D. & R.S.
Temperature (°F) : 72 Humidity (%) : 64
Wind Speed (mph) : 8 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): 43.8

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 76.8 1 78.1
2 76.8 2 78.5
3 76.9 3 78.4
4 77.1 4 78.6
5 77.0 5 78.6
Average of two highest actual noise levels = 77.1 dB(A) Average of two highest actual noise levels = 78.6 dB(A)