ELEC
480 – Notes on Grading Proportional Control Projects:
In grading laboratory reports, different aspects of the report are graded
differently. Here are grading schemes for the different aspects of
the report.
Grade for Technical Portion of Report for
Lab
3 (PID Control) What is in report
|
Grade
|
What is in the
report.
|
|
0
|
It worked! (Apparently
a miracle occurred.)
|
|
1
|
It worked and
the results checked.
|
|
. . .
|
|
|
6
|
Good experimental
procedure and good data. |
|
7
|
Requirements
for 6 + measured SSE. |
|
8
|
Requirements
for 7 + measured speed of response, possible using two different measures
of speed. |
|
9
|
Requirements
for 8 + predicted SSE and speed of response from open loop transfer function |
|
10
|
Requirements for 9
+ evaluated/compared experimental results with theoretical results and
explained differences. |
You need to be clear about what needs to be done. Be aware of the
following.
-
The essence of this lab
is to go beyond what you did before, both in technology (use a new technology)
and the sophistication of your controller (beyond PID or use a compensator).
-
At this point in the course
you should be able to predict SSE and time of response, including any effects
on the steady state produced by offsets, thresholds, etc.
-
You should account for
all offsets, thresholds, etc, and predict the steady state for your system.
-
You should use root locus
techniques (at minimum) to get estimates of pole locations in order to
predict response time.
-
Then, you should measure
your system's response and compare measurements to theoretical predictions.
-
Explain any discrepancies
to the best of your ability.
-
The essence of this lab
is to be able to merge theory and experiment, and to use that information
to judge (i.e. evaluate) the quality of the control you implement.
If you don't do all
of that, you haven't done the lab. The lab is not the measurements
and fiddling with a gain value to get something that looks good.
Your use of theory to explain measurements is the only way the instructor
can be certain that you understand proportional control.