Question 3
c) Proportional Control is to be used on the above system to achieve a phase margin of 50°. What value of proportional gain is required? (4 marks) d) Estimate the system's order and type number. (You are given that a system's type number is equal to the number of integrators it contains in the open loop) (4 marks)
The results of an open loop frequency response test are presented in Table Q3. @ (rad/s) 0.1 0.5 1 2 4 7 10 20 50 100 26.0 20.0 14.0 5.0 -3.0 -9.0 -24.0 -46.5 Phase () -90 -99 -107 -124 -149 -174-192 -221 -250 Gain (dB) 40.0 -65.5 -260 Table Q3 The results of an open loop frequency response test are presented in Table Q3. @ (rad/s) 0.1 0.5 1 2 4 7 10 20 50 100 26
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