6412ELE代写、代做C/C++，Python编程

日期：2025-04-14 10:08

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.