D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Constant Speed

Date : 2008-05-15
Personnel : BS, TS and SC
Temperature (°F) : 61 Humidity (%) : 72
Wind Speed (mph) : 3 Wind Direction : n
Barometric Pressure (in.Hg) : 29.97
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 SC
Initial Sound Level Meter Calibration: false checked by SC
Exterior Ambient Noise Level dB(A): 48.8

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 77.1 1 78.1
2 77.3 2 79.0
3 77.9 3 79.7
4 77.9 4 78.4
5 77.8 5 79.0
Average of two highest actual noise levels = 77.9 dB(A) Average of two highest actual noise levels = 79.4 dB(A)