An actuator for a disk drive uses a shock mount to absorb vibrational energy at approximately 60 Hz [14]. The Bode diagram of G(.(s)G(s) of the control system is shown in Figure E9.18. (a) Find the expected percent overshoot for a step input for the closed-loop
(a) Plot the Bode diagram and (b) determine the gain] K required to obtain a phase margin of 30°. What is

system, (b) estimate the bandwidth of the closed-loop system, and (c) estimate the settling time (with a 2% criterion) of the system.

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X: 486.93 Trans i Y:-4.5924 Y: 0.0 R#:3 #A: 100 Expand 40.000 GMAG DB 10.000I 486 Hz 600.00 Gan crossover 40,000 LG HZ X: 486.93 Trans l Y: 36.215 Y: 0.0 R#:3 #A:100 Expand 180.00 36.2 Phase margin Phase margin at crossover 40.000 LG HZ 486 Hz 600.00