102D3

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Standstill

Date : 1998-09-17
Personnel : B.L., S.C., and R.H.
Temperature (°F) : 69 Humidity (%) : 75
Wind Speed (mph) : 7 Wind Direction : N
Barometric Pressure (in.Hg) : 30.17
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 R.L.L.
Initial Sound Level Meter Calibration: true checked by R.L.L.
Exterior Ambient Noise Level dB(A): 40.1

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 78.2 1 78.0
2 81.0 2 79.6
3 81.2 3 79.8
4 78.3 4 79.6
5 81.5 5 79.2
Average of two highest actual noise levels = 81.4 dB(A) Average of two highest actual noise levels = 79.7 dB(A)