Measurement devices and their dynamics influence the
Chapter 16, Problem 16.1(choose chapter or problem)
Measurement devices and their dynamics influence the design of feedback controllers. Briefly indicate which of the two systems below would have its closedloop performance enhanced significantly by application of cascade control (see Fig. 16.4 for notation and assume Gp2 = 1 and Gd1 = Gp1). Using the controller settings shown below, evaluate the effect of a unit step disturbance in D1 on both systems A and B. System A System B Gv = 5 Gv = 5 2 Gpl = lOs+ 1 2 Gpl = lOs+l Gmz = 0.5 2 0.5s + 1 Gmz = 5s + 1 1 G 0.2 Gml = 5s + 1 ml = 5s + 1 Kcl = 0.5 Kcl = 2.5 'TJl = 15 'TJl = 15 Kcz = 1.0 Kcz = 0.25 All time constants are in minutes
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