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Flight Dynamics Principles, 2nd Edition
book

Flight Dynamics Principles, 2nd Edition

by Michael V. Cook
February 2011
Beginner to intermediate content levelBeginner to intermediate
488 pages
17h 21m
English
Butterworth-Heinemann
Content preview from Flight Dynamics Principles, 2nd Edition
Ch11-H6927.tex 20/6/2007 16: 37 Page 287
Stability Augmentation 287
Thus, again, as K
θ
→∞so
ω
p
.
0.167
4.66
= 0.184 rad/s
2ζ
p
ω
p
8.728
21.716
= 0.402 rad/s (11.29)
and allowing for rounding errors,
ζ
p
1.0 (11.30)
The conclusion is then, that negative pitch attitude feedback to elevator tends to
destabilise the short period mode and increase its frequency whereas its effect on
the phugoid mode is more beneficial. The phugoid stability is increased whilst its
frequency also tends to increase a little but is bounded by an acceptable maximum
value. For all practical purposes the frequency is assumed to be approximately con-
stant. This result is, perhaps, not too ...
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Publisher Resources

ISBN: 9780750669276