Assignment 4 - 2014

Due date(s):	28 February 2014, in class
(PDF)	Assignment questions

<rst> <rst-options: 'toc' = False/> <rst-options: 'reset-figures' = False/> .. rubric:: Assignment objectives: using MATLAB to simulate and test control systems; self-learning new concepts from the simulation.

.. question:: :grading: 15

#. What is the following MATLAB/Simulink simulation a representation of?

.. image:: ../figures/process-control/assignments/simulink-base-flowsheet.png :scale: 80 :width: 700px

#. Attach a copy of the ``Scope`` output for a step input of unit magnitude, occurring at a time of 2 units into the simulation. Your simulation should run until the process reaches steady state.

#. What is the final value of the ``Scope`` output variable when simulated until it reaches steady state?

Demonstrate/show/prove theoretically (i.e. without using Simulink) that this value is correct.

#. Add a time delay to the process of 2 units (as shown below) and resimulate the response to a point in time so that it reaches steady state.

.. image:: ../figures/process-control/assignments/simulink-base-flowsheet-time-delay.png :scale: 80 :width: 700px

Show the ``Scope`` output and describe what you notice.

Explain why it takes longer to reach steady state as compared to your answer in part 1.

#. Next, simulate the process with a time delay

a) of 5 units and b) of 10 units.

Attach the ``Scope`` output for these simulations, and explain why you observe the behaviour noticed.

#. In general, what do you conclude about time delays in a process?

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