Space Grant Consortium - University of Wisconsin - Green Bay

agrees with the accepted model for sound transmission. Tests were also done in a bell jar to
analyze the effects of air pressure on
sound. Figure 8 shows the tests being
done:
The program output a speed of 454.38
meters per second. Again, note the
attenuation from the control case, shown
below in Figure 9:
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
5 5.0001 5.0002 5.0003 5.0004 5.0005 5.0006 5.0007 5.0008 5.0009 5.001
Figure 9: Low Pressure Conditions
This time, the low peaks are shifted to the left. The calculated increase in speed also agrees with
the accepted system for analyzing sound transmission.
A second experimental apparatus of identical dimensions that returns the same numbers as the
flight apparatus was constructed. This setup will run under normal, dry air conditions during the
flight. This will serve as the control and basis for comparison of the flight data.
Table 2 shows additional results from the cold tests:
17
Figure 8: Bell Jar Testing