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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The differences between the two calculations are very small with the exception of the first gain<br />
margin frequency. The difference in frequency could be a result of the time delay mentioned<br />
above, however this would have more effect at higher frequencies. It is reasonable that the results<br />
do not precisely match as they were obtained by different analytical methods. Figure 4.9 contains<br />
a plot of the response with the gain <strong>and</strong> phase margins called out.<br />
Gain Margin 1<br />
Gain Margin 2<br />
Phase Margin<br />
Figure 4.9: Broken Loop Roll Gain/Phase Margin Results<br />
In addition to the broken loop gain <strong>and</strong> phase margins, CIFER ® can also determine b<strong>and</strong>width<br />
values from frequency response data. Using both the <strong>MATLAB</strong> <strong>and</strong> Unix version of CIFER ®<br />
utility 8 for b<strong>and</strong>width calculations, the roll attitude response to lateral stick was examined <strong>and</strong><br />
compared to results obtained from CONDUIT ® . These comparisons are shown in Table 4.2, <strong>and</strong><br />
the difference between the two programs is very small. There was no difference between the<br />
<strong>MATLAB</strong> <strong>and</strong> Unix runs of CIFER ® . The ability to analyze nonparametric frequency responses<br />
is a useful feature of CIFER ® as it allows h<strong>and</strong>ling qualities of a system to be determined without<br />
identification of the full parametric math model.<br />
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