E9.18 An actuator for a disk drive uses a shock mount to absorb vibrational energy at approximately 60 Hz 14]. The Bode plot of the loop transfer function of the control system is shown in Figure E9.18.

(a) Find the expected percent overshoot for a step input for the closed-loop system,

(b) estimate the bandwidth of the closed-loop system, and

(c) estimate the settling time

(with a 2% criterion) of the system.

X: 486.93 Trans 1 40.000 LGMAG Y: -4.5924m Y: 0.0 R#:3 #A: 100 Expand -10.000 40.000 LG HZ 600.00 486 Hz Gain crossover (a)