D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Standstill

Date : 2006-06-20
Personnel : B.S., T.S. and S.C.
Temperature (°F) : 72 Humidity (%) : 54
Wind Speed (mph) : 5 Wind Direction : 2
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: true checked by S.C.
Exterior Ambient Noise Level dB(A): 45.5

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 77.8 1 77.4
2 77.2 2 77.9
3 77.3 3 77.5
4 76.9 4 77.9
5 77.1 5 77.3
Average of two highest actual noise levels = 77.6 dB(A) Average of two highest actual noise levels = 77.9 dB(A)