Question

Question 3 A third order process is to be controlled by a proportional controller (Kp) and is to havea unity feedback closed loop arrangement. The process consists of three first order lags that have the following parameters GP1-1s+1) GP2 8/(s+2) GP3 5(s+0.2) A) Draw the system closed block diagram 3 marks B) Using the Log-Linear graph paper attached at the end of the question paper, plot the Bode Diagram of the system with the proportional controller set to 1, using asymptotic approximations. (Remember to hand in the Bode Plot with your answer book and insert your enrolment number) 10 Marks C) Determine both gain and phase margins for the system when the proportional controller (Kp) = 1 3 Marks D) Calculate the limiting value of Kp in relation to stability and compare with that you would find from your Bode Diagram. 4 Marks

I am stuck on how to create the transfer function to be suitable for a bide plot, then actually plotting the Bode diagram

Answer 1

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