40 LFW

NORTH AMERICAN BUS INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Standstill

Date : 1998-05-13
Personnel : B.L., S.C., and R.H.
Temperature (°F) : 64 Humidity (%) : 49
Wind Speed (mph) : Wind Direction : Calm
Barometric Pressure (in.Hg) : 30.19
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 A
Exterior Ambient Noise Level dB(A): 1.0

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 72.0 1 73.5
2 71.9 2 74.3
3 72.1 3 75.4
4 72.1 4 75.0
5 72.8 5 75.5
Average of two highest actual noise levels = 72.4 dB(A) Average of two highest actual noise levels = 75.5 dB(A)