This problem set reviews the old procedure of estimating closed-loop stability by the Bode method, as well as tuning by gain and phase margins. The pretext is a change of controlled variable for the stirred reactor of Lesson 6; you will use the linearized model of Lesson 6 to do the engineering for this change. It should provide a striking illustration of the effect of nonlinearity on our linear models. Again, use the spreadsheet “exothermic reactor for pset8.xls” to calculate steady-state conditions.

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