CIFER®-MATLAB Interfaces: Development and ... - Cal Poly

Figure 4.22: Aileron - Roll Rate Responses
Figure 4.23: Elevator - Pitch Rate Responses
RMS values for the time history data were manually calculated in MATLAB and compared to the
equivalent values from CIFER ®
calculations as based on the frequency responses. These
comparisons were conducted for both flight and simulation data. Table 4.5 shows the results of
the study. The time RMS values were obtained from the pure control input data. The two
calculations compare well between the two domains.
Table 4.5: Frequency RMS compared to Time RMS
Flight
Simulation
Freq. Time Freq. Time
Ail: 6.05 5.83 9.07 9.01
Ele: 2.66 2.79 3.98 3.77
Rud: 2.36 1.96 2.95 2.85
Whl: 1.10 1.05 1.77 1.74
The crossover frequencies can also be examined by using the CIFER ® RMS calculations. Flight
and simulation results of the same on-axis responses are shown in Table 4.6. All of the cutoff
frequencies based on inputs agree well, which means the flight control performance is consistent
between the simulation and flight.
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