Engineering - Mechanical Engineering Automation assignment

CSA-2-TMAv2.2.pdf

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MODULE TITLE : CONTROL SYSTEMS AND AUTOMATION

TOPIC TITLE : MODELLING OF PROCESSES AND

CONTROL DEVICES AND SYSTEMS

TUTOR MARKED ASSIGNMENT 2

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CSA - 2 - TMA (v2.2)

THIS BOX MUST BE COMPLETED

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Published by Teesside University Open Learning (Engineering)

School of Computing, Engineering and Digital Technologies

Teesside University

Tees Valley, UK

TS1 3BA

+44 (0)1642 342740

retrieval system, or transmitted, in any form or by any means, electronic, mechanical,

photocopying, recording or otherwise without the prior permission

of the Copyright owner.

This book is sold subject to the condition that it shall not, by way of trade or

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Before you start please read the following instructions carefully.

1. This assignment forms part of the formal assessment for this module. If you

fail to reach the required standard for the assignment then you will be

allowed to resubmit but a resubmission will only be eligible for a Pass

grade, not a Merit or Distinction.

You should therefore not submit the assignment until you are reasonably

sure that you have completed it successfully. Seek your tutor's advice if

unsure.

2. Ensure that you indicate the number of the question you are answering.

3. Make a copy of your answers before submitting the assignment.

4. Complete all details on the front page of this TMA and return it with the

completed assignment including supporting calculations where

appropriate. The preferred submission is via your TUOL(E) Blackboard

account:

https://eat.tees.ac.uk

5. Your tutor’s comments on the assignment will be posted on Blackboard.

IMPORTANT

1. A steady state distillation process is shown diagrammatically as

FIGURE 1.

s u p p l i e d t o b o i l e r

FIG. 1

4 

Assuming no heat losses to the atmosphere:

(i) Write four balanced equations for this system.

(ii) Identify where any. constitutive equations may be required for the

modelling processes

2. A process can be represented by the first order equation

dyt  dt

y t   3u t 



Assume the initial state is steady (y = 0 at t = –0).

(a) Determine the transfer function of this process in the s domain.

(b) If the input is a ramp change in u(t) = 4t, determine the value of y(t)

when t = 10 s.

3. Using a simulator of your own choice, or the one used during the lessons

at the website;

http://newton.ex.ac.uk/teaching/CDHW/Feedback/OvSimForm-gen.html

note the initial values used by the simulator and the output produced.

For BOTH ON-OFF and PID control,

(a) sketch (or print copies) of the effect of changing the following

parameters from their existing value (resetting them to the original

after every change has been recorded):

(i) Increasing the proportional control by a factor of 10.

(ii) Decreasing proportional control by a factor of 10.

(iii) Increasing the integral control by a factor of 10.

(iv) Decreasing integral control by a factor of 10.

(v) Increasing the derivative control by a factor of 10.

(vi) Decreasing derivative control by a factor of 10.

(vii) Increasing the hysteresis by a factor of 10.

(viii) Decreasing hysteresis by a factor of 10.

(ix) Increasing the system lag by a factor of 10.

(x) Decreasing system lag by a factor of 10.

(b) Explain your results.

http://newton.ex.ac.uk/teaching/CDHW/Feedback/OvSimForm-gen.html

4. The purpose of the arrangement shown in FIGURE 4 is to

mix the two liquid products A and B in a fixed mass ratio.

Product A, which is itself a mixture, is a 'wild' flow, whilst

product B, a pure compound, is controlled. As the mixture

leaves the tank the transmitter TX measures its density.

(a) Complete the diagram to show how the arrangement

could be controlled by the method of 'variable ratio

control'.

(b) Identify which transmitter provides 'feedforward'.

disturbance caused by a variation in the density of

product A.

Fig 4

5. FIGURE 5 shows a partially completed diagram of a flow

control system. The flow controller is reverse acting and

has a 0.2 to 1.0 bar pneumatic output signal which will

supply both control valves V1 and V2.

The small range control valve, V2, only needs to operate on the

first 25% output change of the controller output signal. For

larger flow rates the small range valve will remain fully open

and control will be achieved by operation of the large range

valve. Note the differing air failure action of the two valves.

Fig 5

Design a system utilising valve positioners which will meet the prestated

specifications.