PID - Feedback Control Systems Feedback Control: is an...

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Feedback Control Systems Feedback Control : is an operation that, in the presence of a disturbance, tends to reduce the difference between the output of a system and the reference input. Block diagrams: are used for the analysis and design of control systems. It is a pictorial representation of a dynamic system in terms of transfer functions. M k x(t) Displacement c f(t) Transfer Function Input, F(s) Output, X(s) 2 1 ( ) G s ms cs k = + +
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Feedback Control Systems: Block diagrams Input, F(s) Output, X(s) ( ) G s Uncontrolled System Reference R(s) Output, X(s) ( ) G s Controlled System ( ) H s Reference R(s) Output, X(s) ( ) G s Controlled System + - + - ( ) H s Error E(s) Control U(s) Error E(s) B(s) B(s) Controller Transfer Function Plant Transfer Function
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Feedback Control Systems: Closed-Loop Transfer Function Controlled System R(s) X(s) ( ) G s + - ( ) H s U(s) E(s) X(s) closed-loop ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 1 ( ) ( ) ( ) ( ) ( ) E s R s X s X s G s H s U s H s E s TF R s G s H s X s G s U s = - = = = + = R(s) X(s) ( ) ( ) 1 ( ) ( ) G s H s G s H s + A feedback control system behaves as a system with new dynamics defined by the closed loop transfer function
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This note was uploaded on 05/09/2009 for the course ME 3514 taught by Professor J.renno during the Fall '08 term at Virginia Tech.

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PID - Feedback Control Systems Feedback Control: is an...

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