D4000 N

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Standstill

Date : 2002-08-15
Personnel : E.D., T.S., & B.S.
Temperature (°F) : 82 Humidity (%) : 63
Wind Speed (mph) : 2 Wind Direction : W
Barometric Pressure (in.Hg) : 30.18
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): 30.18

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 78.5 1 79.3
2 78.0 2 79.0
3 78.5 3 79.3
4 78.2 4 79.2
5 78.3 5 79.1
Average of two highest actual noise levels = 78.5 dB(A) Average of two highest actual noise levels = 79.3 dB(A)