Specifications

Yaw Damper for a 747 Jet Transport
10-15
The washoutfilter places a zero at the origin,which constrains the spiral mode
pole to remain near the origin. We choose for a time constant of five
seconds and use the root locustechniqueto select the filtergain
H. First specify
the fixed part of the washout by
H = zpk(0,-0.2,1);
Connect the washout in series with the design model sys11 (relation between
input1andoutput1)toobtaintheopen-loopmodel
oloop = H * sys11;
and draw another root locus for this open-loop model.
rlocus(-oloop)
sgrid
Create and drag a data marker around the uppercurve to locate the maximum
damping, which is about .
a 0.2=
ssa+
()⁄
ζ 0.3=