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Thread Subject:
Solutions for Plantwide Control

Subject: Solutions for Plantwide Control

From: rami

Date: 30 Dec, 2012 16:40:08

Message: 1 of 2

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 F

feedforward control based on measurements of z0
and F0
. Fsp,
the set point of the reactor ef?uent ?ow controller, can be
used to approximate F. The set point for the reactor level
controller would then be
In the following steps, you are to evaluate Luyben’s proposed
alternative. If necessary, detune any of the controllers to
keep oscillations to a minimum.
(a) Determine how Luyben’s proposed alternative structure
responds to a step change in z0
.
(b) Implement Luyben’s proposed feedforward controller—
that is the equation above—and implement a similar step
change in z0
.
(c) What can you say about the speed of response of this
controlled plant with and without the feedforward controller?
(d) What are the advantages and disadvantages of Luyben’s
proposal?
F.6 Implement Alternatives 3 and 4 using the Simulink
model. This will require tuning a cascade loop to control composition in each case.
HR, sp(t) =
z0
(t)
kRa
1
F0
(t)
  -
1
Fsp
b
(a) Evaluate the response of these controlled plants for a
step change in F0 without using the ratio controller proposed
by Wu and Yu.
(b) Repeat (a) with a controller used to ratio the column
feed ?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 looked
at in this chapter, (i.e., Exercises F.3, F.4a, and/or F.6).
(a) Compare the responses of each control structure to
step changes in reactor feed ?ow rate.
(b) Compare the sensitivities of each alternative to changes
in this variable.
F.8 The recycle plant discussed in this chapter utilizes a
composition-only model; that is, thermal effects are
neglected. Appendix H contains equations and parameters that can be used to model temperature effects in the
reactor. Implement the cooling coil equations for the reactor
and, 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 the
effect of a well-tuned controller for reactor temperature on
the responses of the other system variables such as F and D?
A


you can find this document on http://www.users.abo.fi/khaggblo/PWC/BMAppendixF.pdf

Subject: Solutions for Plantwide Control

From: Steven_Lord

Date: 31 Dec, 2012 03:53:46

Message: 2 of 2



"rami " <icreativeapp@gmail.com> wrote in message
news:kbpqp8$g3o$1@newscl01ah.mathworks.com...
> 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?

*snip*

This sounds like a homework question for a course. In general this newsgroup
requires people posting homework questions (or questions that SOUND LIKE
they're homework, even if they're not) to show what they've done to try to
solve the problem and to ask a SPECIFIC question before the readers will
offer any suggestions. Post the code you've written to try to solve these
exercises and indicate where EXACTLY you're stuck and someone may offer some
assistance.

I will give you a very general suggestion: I would consider using ODE45 in
MATLAB or creating a Simulink model of the system to solve these problems.

FYI, this was also asked on MATLAB Answers:

http://www.mathworks.com/matlabcentral/answers/57655-plantwide-control-training-and-answers

--
Steve Lord
slord@mathworks.com
To contact Technical Support use the Contact Us link on
http://www.mathworks.com

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