Control system & automation HNC 3rd assignment

julian kay

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1. (a) Models can be classified into three categories, depending upon how

they are developed.

(i) Name these three categories of model.

(ii) Give an advantage and disadvantage of each category.

(b) Explain what is meant by:

(i) a steady- state model

(ii) a dynamic model.

why.

2. A steady state distillation process is shown diagrammatically as

FIGURE 1.

FIG. 1

Heat removed by condenser

Feed F kg s–1

60% X w/w 40% Y w/w

Heat supplied to boiler

Bottom product B kg s–1

90% Y w/w 10% X w/w

Top product T kg s–1

99% X w/w 1% Y w/w

Teesside University Open Learning (Engineering)

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.

3. (a) FIGURE 2 shows two cylindrical tanks interconnected with a pipe

which has a valve that creates a constant resistance to flow of Rf when fully open. The height of liquid (of density ρ) in the first tank is hin and the second tank hout. The cross-sectional area of the first

tank is Ain m 2 and the second tank Aout m

FIG. 2

The flow rate of liquid through the valve is given by

where Q p

= =

flow rate in m s pressure due to he

3 –1

in iight of liquid in first tank (Pa) presoutp = ssure due to height of liquid in second tankk (Pa)

Q R

p p= ( )1 f

in out–

hin

hout

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Produce a mathematical model of the process to determine the

change in height of fluid in the second tank when the valve is open.

(b) Determine the time constant for the system.

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

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.

5. 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.

4 3 d

y t

t y t u t

( ) + ( ) = ( )

Teesside University Open Learning (Engineering)

(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 Open Learning (Engineering)

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