D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Standstill

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: true checked by SC
Exterior Ambient Noise Level dB(A): 49.5

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 79.4 1 79.4
2 79.1 2 79.3
3 79.1 3 79.3
4 79.3 4 79.7
5 79.6 5 79.8
Average of two highest actual noise levels = 79.5 dB(A) Average of two highest actual noise levels = 79.8 dB(A)