Lect9 - System type - 3/2/2010 Lecture Note 9 : Lecture...

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3/2/2010 1 Lecture Note 9 : Properties of Feedback: System Type AE353, Spring 2010 Prof. Soon Jo Chung ([email protected]) Chapter 4 Basic Properties of Feedback Why Feedback? System Type (Type 0, Type I, Type II, …. .)
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3/2/2010 2 Why Feedback Control? Robust w.r.t uncertain plant (Section 4.1.4) Robust to External Disturbances Better Performance! Stabilize Unstable System (Example 3.31 from Routh Stability) Chapter 1 and Chapter 4 discuss these in detail Equivalent Feedback Loop with Hr inside reference: R W: Disturbance + G(s) plant Controller D + Sensor: H /Hr=1 output: Y + + Sensor: Hy/Hr=1 Sensor Noise: V +
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3/2/2010 3 Let’s find error Error w.r.t. Reference Error due to Disturbance Error due to Sensor Noise Closed Loop Open Loop Less sensitive to disturbance Higher Gain D Increase performance & robustness In general, as the control gain D(s) increases, we will see smaller errors.
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This note was uploaded on 04/12/2010 for the course AE 353 taught by Professor Voulgaris,p during the Spring '08 term at University of Illinois, Urbana Champaign.

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Lect9 - System type - 3/2/2010 Lecture Note 9 : Lecture...

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