Fa2004 16.33310-3 Yaw Damper Part 2 Can avoid this problem to some extent by filtering the feed back signal Feedback only a high pass version of the r signal High pass cuts out the low frequency content in the signal steady state value of r would not be fed back to the controller New yaw damper: 8c=kr(rc- Hu(sr)where Hu(s)=Tsi is the washout filt Washout filter with a4_2 Figure 4: Washout filter with T= 4. 2 New control picture k H2(s)Fall 2004 16.333 10–3 Yaw Damper: Part 2 • Can avoid this problem to some extent by filtering the feedback signal. – Feedback only a high pass version of the r signal. – High pass cuts out the low frequency content in the signal ⇒ steady state value of r would not be fed back to the controller. • New yaw damper: δc = kr(rc − Hw(s)r) where Hw(s) = τs is the r τs+1 “washout” filter. 10−2 10−1 100 101 10−2 10−1 100 Washout filter with τ=4.2 |H w(s)| Freq (rad/sec) Figure 4: Washout filter with τ = 4.2 • New control picture δa p 1 φ - - - s Glat(s) δc rc r r 1 ψ - - H - - - kr r(s) – 6 s H  w(s)