CIFER®-MATLAB Interfaces: Development and ... - Cal Poly
CIFER®-MATLAB Interfaces: Development and ... - Cal Poly
CIFER®-MATLAB Interfaces: Development and ... - Cal Poly
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CIFER ® offers a utility for analyzing b<strong>and</strong>width <strong>and</strong> crossover properties of frequency responses.<br />
Use of the h<strong>and</strong>ling qualities portion of the B<strong>and</strong>width utility allows identification of –180-degree<br />
<strong>and</strong> –135-degree b<strong>and</strong>width frequencies <strong>and</strong> gains. Table 4.7 shows the –135-degree b<strong>and</strong>width<br />
frequencies for the main on-axis responses in flight <strong>and</strong> simulation. The attitude b<strong>and</strong>widths were<br />
determined by integrating the corresponding rate response.<br />
Table 4.7: -135-Degree B<strong>and</strong>width Frequencies<br />
Flight: Sim:<br />
PHI/AIL 2.75 2.33<br />
THETA/ELE 5.86 4.27<br />
PSI/RUD 2.32 2.39<br />
PSI/WHL 2.62 3.78<br />
BETA/WHL 1.53 none<br />
These results compare reasonably well between flight <strong>and</strong> simulation. As the cutoff frequency can<br />
be indicative of the b<strong>and</strong>width frequency it is useful to show comparisons between the two.<br />
Figures 4.26 through 4.28 show these comparisons for each axis on the attitude response for the<br />
aircraft. The results for the roll <strong>and</strong> pitch axes as well as the yaw flight data compare reasonably<br />
well. The cutoff <strong>and</strong> b<strong>and</strong>width frequencies for the yaw simulation data do not compare as well,<br />
which likely is a result of the differing output autospectra.<br />
Figure 4.26: Aileron to Roll Attitude Response<br />
Figure 4.27: Elevator to Pitch Attitude Response<br />
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