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 simulato

MODULE TITLE : CONTROL SYSTEMS AND AUTOMATION TOPIC TITLE : MODELLING OF PROCESSES AND CONTROL DEVICES AND SYSTEMS TUTOR MARKED ASSIGNME NT 2 NAME ............................................................................................................................. ........... ADDRESS ............................................................................................................................. .... ............................................................................................................................. ...................... ........................................................................................................... ........................................ ...................................................... HOME TELEPHONE ..................................................... EMPLOYER ................................................................................ .............................................. ............................................................................................................................. ...................... ........................................................... ........................................................................................ ...................................................... WORK TELEPHONE ...................................................... CSA - 2 - TMA (v 2.1) © Teesside University 201 9 THIS BOX MUST BE COMPLETED Student Code No. .................................................................................................... Student's Signature .................................................................................................. Date Submitted ........................................................................................................ Contact e -mail .................... ..................................................................................... 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 All rights reserved. No part of this publication may be reproduced, stored in a 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 otherwise, be lent, re -sold, hired out or otherwise circulated without the publisher's prior consent in any form of binding or cover other than that in which it is publishe d and without a similar condition including this condition being imposed on the subsequent purchaser. © Teesside University 201 9 Teesside University Open Learning (Engineering) Before you start please read the following instructions ca refully. 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 yo ur 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. 1 IMPORTANT © Teesside University 201 9 Teesside University Open Learning (Engineering) 1. A stead y state dist ill ati on process is shown di a g r a mma t i c a l l y a s FIGURE 1. Feed F kg s–1 60% X w/w 40% Y w/w Heat removed by condenser Top product T kg s–1 99% X w/w 1% Y w/w H e a t s u p p l i e d t o b o i l e r FIG. 1 2 © Teesside University 201 9 Teesside University Open Learning (Engineering) 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  © Teesside University 201 9 Teesside University Open Learning (Engineering)  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) = 4 t, 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/F eedback/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. © Teesside University 201 9 Teesside University Open Learning (Engineering) 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 t ransmitter 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'. (c) Describe how the control system responds to a disturban ce caused by a variation in the density of product A. Fig 4 6 © Teesside University 201 9 Teesside University Open Learning (Engineering) 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 . 7