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1983-10-04
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57 lines
10 being a reasonable starting point.
Now, we return to the network editor and retrieve (or
rewrite) the lowpass filter that we analyzed earlier. Then,
we come back to the optimization section. When selecting the
elements for inclusion in the optimization table, it is not
possible to select certain elements such as OPN, SHT, ONE,
TWO, IMP, and IMS, and none of the interconnections or trans-
formations, as variables. Doing so will illicit an error mes-
sage from the program. Also, the parameter number selected
is checked against the number of parameters for that element.
Selecting inappropriate parameter numbers will also result in
an error message.
In this example, we will select all three elements as
variables for optimization. We do this by selecting the ADD
option from the menu, entering the element number, and then
the parameter number, which in all three cases here is one.
Our listing should look like this:
ELEMENT PARAMETER GRADIENT
TYPE NUM NUM VALUE
1 CPP 1 1 1.967
2 INS 2 1 12.875
3 CPP 3 1 6.366
For the sake of curiosity, let's do a sensitivity analy-
sis of our network. Upon return, we observe the following:
ELEMENT PARAMETER GRADIENT
TYPE NUM NUM VALUE
1 CPP 1 1 1.967 -163.439
2 INS 2 1 12.875 9.968
3 CPP 3 1 6.366 72.048
ITERATION #0 ERROR = 125.9
We can now proceed right into the optimization procedure
by selecting option 5. The program now asks if hard copies of
the intermediate results are desired. This is optional. Next,
we are asked for the number of random moves desired. Since
this is a very simple problem, we will not require any random
searches, so we enter 0. The final result of all this is:
ELEMENT PARAMETER GRADIENT
TYPE NUM NUM VALUE
1 CPP 1 1 3.341 -3.631
2 INS 2 1 13.646 0.259
3 CPP 3 1 6.007 0.374
ITERATION #38 ERROR = 0.24
This is quite an improvement. Notice that the first ele-
ment made the most dramatic amount of change, whereas the sec-
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