```Date: Dec 30, 2012 11:40 AM
Author: rami
Subject: Solutions for Plantwide Control

I am a software engineer for some of leading companies that specialist in building controller software and Application, I am going to build new software, that needs engineering skills beside to the software and coding skills. Everything going well with me, I started reading some of Plantwide Control pdfs and take a look into some of the related algorithms and diagrams.can you provide me with the solutions and answers for the exercises in each Appendix?Ex: Appendix Ffeedforward control based on measurements of z0and F0. Fsp,the set point of the reactor ef?uent ?ow controller, can beused to approximate  F. The set point for the reactor levelcontroller would then beIn the following steps, you are to evaluate Luyben?s proposedalternative. If necessary, detune any of the controllers tokeep oscillations to a minimum.(a) Determine how Luyben?s proposed alternative structureresponds to a step change in z0.(b) Implement Luyben?s proposed feedforward controller?that is the equation above?and implement a similar stepchange in z0.(c) What can you say about the speed of response of thiscontrolled plant with and without the feedforward controller?(d) What are the advantages and disadvantages of Luyben?sproposal?F.6 Implement Alternatives 3 and 4 using the Simulinkmodel. This will require tuning a cascade loop to control composition in each case.HR, sp(t) =  z0(t)kRa1F0(t)  -  1Fspb(a) Evaluate the response of these controlled plants for astep change in F0 without using the ratio controller proposedby Wu and Yu.(b) Repeat (a) with a controller used to ratio the columnfeed ?ow rate to the reactor feed ?ow rate. How do the responses in (a) and (b) compare?F.7 Evaluate any two of the four alternatives we have lookedat in this chapter, (i.e., Exercises F.3, F.4a, and/or F.6).(a) Compare the responses of each control structure tostep changes in reactor feed ?ow rate.(b) Compare the sensitivities of each alternative to changesin this variable.F.8 The recycle plant discussed in this chapter utilizes acomposition-only model; that is, thermal effects areneglected. Appendix H contains equations and parameters that can be used to model temperature effects in thereactor. Implement the cooling coil equations for the reactorand, using the cooling water ?ow rate as manipulated variable,design a PI controller that will control reactor temperature.Test your plant?s response to a step change in reactor feed?ow rate using any of the control structure alternatives discussed in this chapter. What can you conclude regarding theeffect of a well-tuned controller for reactor temperature onthe responses of the other system variables such as F and D?Ayou can find this document on http://www.users.abo.fi/khaggblo/PWC/BMAppendixF.pdf
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