MECH 466 - Lecture7-Routh-HurwitzCriterion-2009W

Difficult small difference between high and low

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Unformatted text preview: change of water level may Overcause full action of valve.) This can be avoided by a proportional control. High limit desired Low limit High limit desired Low limit 2008/09 MECH466 : Automatic Control 29 2008/09 Proportional control (P-control) MECH466 : Automatic Control 30 Prelab for Lab 2 Before going to Lab 2, think about how to complete the blank part for both on-off and P-control! onP- Set value (desired level) Set Controller gain KP (design parameter) (design Controller Command voltage (See Slide 26 for notation) Command Note that there is a steady state error. Note error. Set value 2008/09 MECH466 : Automatic Control 31 2008/09 MECH466 : Automatic Control 32 8 Some useful LabVIEW blocks coerced(x) coerced(x) x (TRUE or FALSE) If “s”=TRUE, then the output is “t”. If “s”=FALSE, then the output is “f”. 2008/09 MECH466 : Automatic Control 33 9...
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