Exercise EE
189
From the graphs obtained, select values of P, I and D that give the best results.
Perform a final test run, logging the pressure P3 over time as it rises from a low
value. Compare this to the initial graph.
Results
For easy identification or results, it is suggested that each results sheet is renamed
with a descriptive title (e.g. ‘Set Point’, ‘Integral Setting’, etc.). The entire workbook
should be saved with a suitable filename for future reference (e.g. PCT40 Exercise
EE).
Each set of data not already graphed as part of the procedure should be plotted on a
graph of pressure P3 against time.
Make a comparison of each variation in the experimental conditions against the
graph of the initial set of results, noting the difference in response. Comment on the
results obtained by varying the values of P, I and D, and on the ease of optimisation
of the process. If the level and temperature control exercises have already been
performed, compare the ease of optimisation for pressure control with the
optimisations for PID level and temperature control. Discuss the suitability of PID
pressure control for regulating flow rate.
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