100 (s + 10) (s + 100) e 0.5s. s 100 (s + 10) (s + 100). G(s) =


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1 1 AME 3315; Spring 215; Midterm 2 Review (not graded) Problems: except parts 5 and except parts 4 and You are given the transfer function: G(s) = 1) Plot the bode plot for G(s) 1 (s + 1) (s + 1) e.5s. 2) Find the analytic solution to G(iω) and (G(iω)). Plot the bode plot for the transfer function: (A) G(s) = s 1 (s + 1) (s + 1). 1) Below are pole and zero locations for five different transfer functions G(s). Match the pole and zero locations to the corresponding bode plots in Fig. 1. You do not need to perform any calculations to receive full credit; however, you do need to provide a complete justification. Notes: (i)
2 2 a) There are more bode plots than pole/zero sets, so one bode plot will not have a match; b) (s i) (s i) = s 2 + 1s + 1; c) (s i) (s i) = s 2 + 1s + 9; d) (s i) (s i) = s 2 + 1s ) z = [ 5 ± 29.58i], p = [, 1, 5 ± 31.23i]: match = ; Justification: 2) z = none; p = [ 5 ± 8.66i]: match = ; Justification: 3) z = none; p = [, 1]: match = ; Justification: 4) z = none; p = [, 1]: match = ; Justification: 5) z = none; p = [ 5 ± 29.58i]: match = ; Justification:
3 3 a) b) c) d) e) 2 f) Fig. 1. Set of six different bode plots.
4 4 2) Your colleague is a cheapskate and wants to purchase a lessexpensive system with the input/output relationship for a harmonic input given by Fig. 1a. However, in certain operating modes (s)he may require a harmonic output with a frequency of 4 rad/sec. Write a letter to your colleague explaining why (s)he may want a system that has an input/output relationship that looks more like Fig. 1c, even if it is more expensive. 3) A system G(s) has the bode plot given in Fig. 1b. If this G(s) is in the feedback loop given in Fig., which bode plot in Fig. 1 corresponds to the transfer function Y (s) R(s) = G(s) 1+G(s) and which corresponds to the transfer function E(s) R(s) = 1 1+G(s)? R(s) +  E(s) G(s) Y(s) Fig. 2. Standard feedback loop. A stable plant is inherently more stable than an unstable plant when in a feedback loop. Prove that a stable, type firstorder or secondorder plant with positive gain, K >, is stable for all PDControl designs (k p and k d > ): P 1 (s) = K s + a ; P 2(s) = Also, prove that this is not true for unstable plants. K (s + a 1 )(s + a 2 ) ; or P ωn 2 3(s) = K s 2 + 2ζω n s + ωn 2 Consider the system shown in Fig. 3, which consists of a prefilter and a unity feedback system. 1) Determine the transfer function from R to Y.
5 5 2) Determine the steadystate error due to a step input. 3) Discuss the effect of different values of (K r,a) on the system s response. R K s+1 r s+a +  A s(τs+1) Y Fig. 3. Feedback system with a prefilter. You are given the bode plot in Fig. 4 and no other information about the system it represents. Approximate the transfer function, G(s), from the bode plot. Assume that, asymptotically, the plot maintains its form beyond the frequency range shown. Show the individual transfer function components you combined together to assemble the entire transfer function.
6 Fig. 4. Bode plot. Use Routh s stability criterion to determine how many roots with positive real parts the following equations have. Verify your answer with the Matlab function roots. 1) s 4 + 8s s 2 + 8s + 1 = 2) s 4 + 2s 3 + 7s 2 2s + 8 = 1) Consider the feedback control system shown in Fig. 5. The stability properties of the system are a function of the proportional feedback gain k p. a) Is the plant: P (s) = s + 1 s(s 1)(s + 6)
7 7 stable? Explain why. b) Determine the range of k p over which the feedback control system is stable. R(s) +  k p s+1 s(s1)(s+6) Y(s) Fig. 5. Feedback control system. 2) Find the range of controller gains (k p and k i ) so that the ProportionalIntegral (PI) controlled system in Fig. 6 is stable. R(s) +  k +k (1/s) p i 1 (s+1)(s+2) Y(s) Fig. 6. Feedback control system. You are designing a controlled system to accurately position the angle of a motor shaft. The plant (motor) has the transfer function Θ m (s) I a (s) = k τ s ( s where k τ is an unknown scalar parameter. The motor is in the feedback loop given by Fig. 7. )
8 8 (Franklin, Powell, 22) R(s) +  E(s) K(s) I (s) a Θ m(s) I (s) a Θ (s) m Fig. 7. Closedloop system for motor position control. (A) 1) (2pts) As a preliminary test you examined the response of the closedloop system to a unit step reference signal (r(t) = 1(t)); the measured response for motor position is given in Fig. 8. Given that you were using a proportional controller with K(s) = 1, estimate the value of k τ from the step response. 2) (1pts) Next, you are tasked with designing the closedloop system to have a rise time of.6 sec and an overshoot of 15%. Sketch in the complex plane given in Fig. 9 the region at which you should place the closedloop poles given these performance metrics.
9 θ (t) [rad] m Time [sec] Fig. 8. Step response of the closedloop system in Fig. 7 for an unknown k τ. 4 3 ζ=.76 ζ=.86 ζ=.64 ζ= ζ=.94 Imaginary Axis 1 1 ζ=.985 ω =5 ζ=.985 ω =4 ω =3 ω =2 n n n n n ω =1 2 ζ=.94 3 ζ=.86 ζ=.76 ζ=.64 ζ= Real Axis Fig. 9. Complex plane. Diagonal lines are level sets of a fixed ζ. Arcs are level sets of a fixed ω n.
10 1 Suppose you are given the plant: P (s) = 1 s 2 + (1 + α)s + (1 α) where α is a system parameter that is subject to variations; < α <. The plant is in a typical unity feedback loop and controlled by Pcontrol where K(s) = k p. Draw a map of the range of α > and k p > such that the closedloop system is stable. PID Control Design Problem (For those who want a challenge) An Analog Devices AD8131 opamp has the transfer
11 11 function: 2 G(s) = ( s + 1 ) 2. 2π ) Find the analytic solution for G(iω) and (G(iω)). 2) As you know, any periodic function can be written as a infinite sum of sinusoids, also called a Fourier Series. For instance, a square wave with magnitude A and period T can be written as: V i (t) = 1 2 A + k=1 ( ) A 2πk (1 cos(πk)) sin πk T t. (1) Of course it is impossible to have a sum of an infinite number of sinusoids, instead we typically approximate the periodic function by N sinusoids. Fig. 1 demonstrates a square wave approximation for N = 5, 5, and 5 sinusoids.
12 12 A N = 5 N = 5 N = 5 V i (t) [V] T 2T Time [msec] Fig. 1. Approximation of a square wave with N sinusoids. Given your analytic solution from Part 1, write the analytic solution for the output, V o (t), given that the input is the infinite sum in Equation (1). 3) Assuming you have the correct solution in Part 2, the actual output, V o (t), is shown in Fig. 11 for N = 5, and T = sec. The ideal output, 2V i (t), is plotted as well. Describe why the sharp corners to the square wave have been rounded off.
13 13 Ideal Actual V o (t) [V] A 2A T 2T Time [msec] Fig. 11. Ideal and actual output of the AD8131.
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