Spring 2003 10.450 Process Dynamics, Operations, and Control Problem Sets - 7 In this problem set, you’ll introduce a new capability and verify that your simulator is working properly. 1.First, install dead time between the manipulated variable (mv) and the controlled variable (cv). Do this by calculating the number of elements in the manipulated variable holding array (output) that constitute the dead time (suppose it’s 7, for example). Then drive cv NOT with the current value of mv (=output(200)), but with the value that it WAS one dead time earlier (=output(193)). See Marlin p,922 for guidance. 2.Now you have an FODT model. Validate your model by calculating step responses and comparing to the analytic solutions. First, a step in disturbance, which should not be affected by dead time. Second, a step in manipulated variable, which should show the dead time. Plot your sim450 traces together with the analytic solutions. (I found it convenient to issue the Matlab command sim_data = [ time’ setpt’ disturbance’ output’ contvar’ ]
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