102D3

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Constant Speed

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: false checked by R.L.L.
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 73.5 1 73.2
2 73.8 2 73.4
3 73.5 3 74.2
4 73.5 4 74.4
5 75.8 5 73.6
Average of two highest actual noise levels = 74.8 dB(A) Average of two highest actual noise levels = 74.3 dB(A)