Q3. (a) The Bode plot of a linear system is given in Figure Q3a. 101 50 10° 101 102 103 104 0 -50 Magnitude (dB) -100 -

[answerhappygod]

Q3 A The Bode Plot Of A Linear System Is Given In Figure Q3a 101 50 10 101 102 103 104 0 50 Magnitude Db 100 1 (162.67 KiB) Viewed 40 times

Q3. (a) The Bode plot of a linear system is given in Figure Q3a. 101 50 10° 101 102 103 104 0 -50 Magnitude (dB) -100 - 150 -200 1111 فيد பா -50 TTTTT דיייייי -100 -150 Phase (degrees) -200 -250 -300 10-1 10° 101 103 102 frequency (rad/s) 104 Figure Q3a Bode plot of the system i) ii) What are the approximate phase margin and gain margin of the system? 2 marks Design a lag compensator that provides a phase margin of around 30 degrees and a recovery factor of 6 in gain at low frequency. Make sure the frequency of the phase dip of the compensator is one decade less than the gain crossover frequency, o at which the desired phase margin is obtained. 5 marks °8_lag, iii) Describe the differences of feedback systems against open loop systems in terms of a) disturbance rejection, b) sensitivity, and c) time constant of the system. 3 marks