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

La
Length: Lm = [4.14]
N
τ
a
Time Constant: τ
m
= [4.15]
N
Frequency:
ω = N
[4.16]
m
ω a
Figure 4.29 shows results for the roll axis plotted on the scaled WL-TR-84-3162 12 handling
specification for roll attitude. The flight bandwidth is within the level 1 handling qualities
boundary while the simulation result is level 2. Though the bandwidths of the two tests are
similar, the phase delay is significantly different: 0.093 for simulation and 0.001 for flight. This is
a result of the differences in the phase curve of the frequency response, shown in Figure 4.30 with
the 180-degree and twice 180-degree frequencies marked. The simulation data rolls off much
more quickly than the flight data. The discrepancy between the two tests would need to be cleared
up before a solid conclusion on the handling qualities could be reached.
Level 3
Level 2
Level 1
Figure 4.29: Scaled Roll Bandwidth Criteria
Figure 4.30: On Axis Roll Attitude Response
The analogous scaled specification for pitch attitude bandwidth is shown in Figure 4.31. Only
flight data was calculated as the simulation data did not exhibit a –180-degree phase crossing at
55