30LFN

NORTH AMERICAN BUS INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Standstill

Date : 2004-03-24
Personnel : G.M., T.S. and S.C.
Temperature (°F) : 51 Humidity (%) : 35
Wind Speed (mph) : 5 Wind Direction : sw
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): 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 71.4 1 73.2
2 71.0 2 73.6
3 72.8 3 73.3
4 71.7 4 73.4
5 72.3 5 73.6
Average of two highest actual noise levels = 72.6 dB(A) Average of two highest actual noise levels = 73.6 dB(A)