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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 305
Stability Augmentation 305
Real (w)
5 4 3 2 1
0
Imaginary ( jw)
0
1
2
3
4
5
6
7
8
X
X
X
Spiral
mode
locus
Dutch roll
mode locus
Roll mode
locus
K
f
0.2
0.5
1.0
X – Open loop poles
– Open loop zeros
– Gain test points
Graph scales – rad/s
s-plane
0.15
0.1
0.1
Coupled
roll-spiral
mode locus
1.7
Figure 11.21 Root locus plot – roll attitude feedback to aileron.
As K
φ
is increased the spiral mode pole moves to the left on the s-plane and
its stability increases very rapidly, a very small value of gain being sufficient
to place the pole on the left half of the s-plane. At a slightly larger value
of gain, K
φ
=−0.14 rad/rad, the spiral and roll ...
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Publisher Resources

ISBN: 9780750669276