A simplified model of the longitudinal motion of a certain helicopter near hover has the
Chapter 5, Problem 5.15(choose chapter or problem)
A simplified model of the longitudinal motion of a certain helicopter near hover has the transfer function and the characteristic equation 1 + D(s)G(s) =0. Let D(s) = kp at first. (a) Compute the departure and arrival angles at the complex poles and zeros. (b) Sketch the root locus for this system for parameter K = 9.8 kp . Use axes 4 x 4; 3 y 3. (c) Verify your answer using MATLAB. Use the command axis([4 4 3 3]) to get the right scales. (d) Suggest a practical (at least as many poles as zeros) alternative compensation D(s) that will at least result in a stable system
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