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School of Engineering
6312ELE/6412ELE: Process Control
Coursework
Control system design and simulation for a chemical process
Module Name: Process control
Module Code: 6312ELE/6412ELE
Level: 6
Credit Rating: 20
Weighting: 30% (exam worth 70%)
Contact: If you have any issues with this coursework you may contact your lecturer.
Contact details are:
Issue Date: Monday 11 March 2024
Submission Deadline: Friday 19 April 2024 – uploading to Canvas.
Feedback: Feedback will be given on the marked coursework.
Programmes: BEng Electrical and Electronics Engineering
2
Introduction
This coursework is to be carried out individually. It includes some questions and is designed to meet the
Learning Outcomes of this module, as presented in the module proforma, i.e.
Learning Outcomes:
LO1 Identify the principles of cascade, feed-forward and ratio control of process plants,
with typical applications
LO2 Appraise typical componentsin processsystems and develop processmodelsfor
analysis and controller design
LO3 Characterise strategies for controlling systems possessing dead-time, inverse
response and interaction properties
LO4 Use computer based software packagesfor analysis, design and simulation of
process control systems
Additional learning outcomes:
1. Knowledge and understanding of scientific principles and methodology necessary to underpin
their education in their engineering discipline, to enable appreciation of its scientific and
engineering context, and to support their understanding of historical, current, and future
developments and technologies
2. Ability to apply and integrate knowledge and understanding of other engineering disciplines to
support study of their own engineering discipline
3. Understanding of engineering principles and the ability to apply them to analyse key engineering
processes
4. Ability to identify, classify and describe the performance of systems and components through
the use of analytical methods and modelling techniques
5. Ability to apply quantitative methods and computer software relevant to their engineering
discipline, in order to solve engineering problems
6. Understanding of and ability to apply a systems approach to engineering problems
Coursework Specification and Marking Scheme
A concentration control loop in an industrial chemical process can be represented by a second order
dynamics with a long transmission delay. The two time constants of the second order dynamics are T1 =
4 min and T2 = 6 min respectively. The steady state gain is 5 and the dead time is 12 min. The loop is to
be controlled to achieve a desired dynamics of first order with time constant Td = 2 min and zero steady state offset for a step reference. Produce solutions to the following questions.
3
(i) Identify the plant transfer function. Then, design a feedback control system with the
controller designed using Direct Synthesis method, where the time-delay is approximated
using the first-order Taylor expansion. Implement the controller with a standard industrial
PID controller.
Simulate the designed control system for 100 minutes using a unity step input as the
reference signal. Display the output and the set-point in the top figure, and the
corresponding control variable u(t) in the bottom figure.
[20 marks]
(ii) Design a feedback PID control system for the given plant, where the PID controller is
designed using the closed-loop Ziegler-Nichols empirical method. The Simulink model used
in the experiment to obtain the sustained oscillatory output curve should be displayed, and
the output curve should also be displayed. The controller design procedure should be
presented. Do the same simulation and display the results as in (i).
[20 marks]
(iii) Design a Smith Predictor control system for the given plant with the controller designed
using the Direct Synthesis method. A block diagram should be shown to demonstrate the
control system structure. The design details are also required. The designed controller
should be implemented using a PID controller. Do the same simulation as in (i).
[20 marks]
(iv) Construct a Simulink model with three sub-models with each for a control system designed
in the above. Run the simulation and display the results with three outputs and the set-point
in the top figure, and the three control signals in the bottom figure. Compare the
performance of the designed three control systems and comment on the performance.
[20 marks]
(v) Write a formal report to present the design, simulations and the results. The report should
have a content list, a brief introduction, description of the process to be controlled,
presentation of the control system design using each method, simulation models, control
systems outputs and corresponding control variables, and finally the comparison, comments
and conclusion.
The report should be written logically, clearly and completely. Mathematical expressions
would be presented using Microsoft Equation. All figures would have title, labels, units for
variables and legends as appropriate.
[20 marks]
Recommended Reading
4
References
Course Material Book
Author: Seborg, Edgar and Mellichamp
Publishing Year: 2011
Title: Process dynamics and control
Subtitle:
Edition: 3rd
Publisher: McGraw-Hill
ISBN: 978-0-470-64610-6
Author: Ogata, K.
Publishing Year: 1997
Title: Modern Control Engineering
Subtitle:
Edition: 3rd
Publisher: Prentice Hall International
ISBN: 0-13-261389-1
5
Guide to Performance Criteria (The Module Leader is advised to delete sections not applicable to
the coursework set and if necessary modify the criteria accordingly)
70% and above:
Your work must be of outstanding quality and fully meet the requirements of the coursework
specification and learning outcomes stated. You must show independent thinking and apply this to your
work showing originality and consideration of key issues. There must be evidence of wider reading on
the subject.
Key words which may describe a coursework at this level include: appraises, compares, concludes, contrasts,
criticizes, critiques, defends, discriminates, evaluates, explains, interprets, justifies, relates, supports.
60% - 70%:
Your work must be of good quality and meet the requirements of the coursework specification and
learning outcomes stated. You must demonstrate some originality in your work and show this by
applying new learning to the key issues of the coursework. There must be evidence of wider reading on
the subject.
Key words which may describe a coursework at this level include: categorizes, combines, compiles, creates,
devises, generates, modifies, reconstructs, identifies, illustrates, outlines, synthesizes.
50% - 60%:
Your work must be comprehensive and meet all of the requirements stated by the coursework
specification and learning outcomes. You must show a good understanding of the key concepts and be
able to apply them to solve the problem set by the coursework. There must be enough depth to your
work to provide evidence of wider reading.
Key words which may describe a coursework at this level include: demonstrates, changes, applies, operates,
produces, predicts, shows, solves, uses, translates, comprehends, converts, generalizes.
40% - 50%:
Your work must be of a standard that meets the requirements stated by the coursework specification
and learning outcomes. You must show a reasonable level of understanding of the key concepts and
principles and you must have applied this knowledge to the coursework problem. There should be some
evidence of wider reading.
Key words which may describe a coursework at this level include: comprehends, defines, describes, identifies,
knows, labels, lists, matches, outlines, recalls, recognizes, reproduces, selects, states, rewrites.
Below 40%:
Your work is of poor quality and does not meet the requirements stated by the coursework specification
and learning outcomes. There is a lack of understanding of key concepts and knowledge and no
evidence of wider reading.
6
Plagiarism
Plagiarism is considered as academic misconduct. The University takes cases of plagiarism very seriously
and all alleged cases of academic misconduct will be investigated thoroughly by a School Investigatory
Panel. Students are advised to ensure that any coursework submitted is their own work or, where the
work of others is referred to (this includes any third-part material e.g. text, images, diagrams, drawings),
it is correctly referenced. The University defines plagiarism in the following way:
• The representation of the work, written or otherwise, of any other person, from any source
whatsoever, as the candidate's own. Examples of plagiarism may be as follows:
• The verbatim copying of another's work without clear identification and acknowledgement –
including the downloading of materials from the internet without proper referencing and
acknowledgement
• The close paraphrasing of another's work by simply changing a few words or altering the order
of presentation, without clear identification and acknowledgement.
• Unidentified and unacknowledged quotation of phrases from another's work.
• The deliberate and detailed presentation of another's concept as one's own.