
(d
e
)
forced
(t) ¼ 5(0:1733e
100t
)(8:285)
The total response d
e
(t) and its components (d
e
)
slow
(t), (d
e
)
fast
(t), and (d
e
)
forced
(t) are shown in
Figure 8.50.
From the top graph, it is clear that both fast and slow components are present in d
e
(t). Despite the
existence of an appreciable slow component, d
e
(t) is nonetheless identified as a fast state variable.
Multirate simulation of the overall system must integrate d
e
(t) at the fast frame rate due to the
significant high-frequency component (d
e
)
fast
(t).
8.4.5 MULTIRATE INTEGRATION OF AIRCRAFT PITCH CONTROL SYSTEM
The MATLAB M-file ‘‘Chap8_multi_rate_integ.m’’ includes code for implementing multirate
integration ...