Self-learning fuzzy controller

Jayeeta Banerjee (eeejbane@livjm.ac.uk)
Thu, 8 Apr 1999 04:06:40 +0200 (MET DST)

Hello everbody,

Please take sometime to read this and help a hapless research student if
you can.

I am working with a standard self-learning fuzzy logic controller and
unfortunately,I've come across some problems that I can't seem to be
able to solve. So I was wondering if there's anyone out there, who can
give me some suggestions.

1. The controller is trying to track a square wave. It has an empty
rule-base initially . The output response improves within the first two
cycles, but then it subsequently 'unlearns' and the behaviour
deteriorates and then some more cycles down its performance stays
constant.
I can't seem to understand why it 'unlearns'.

2. The number of changes to the rule-base made per cycle remains
constant and doesn't decrease. Obviously the learning isn't converging.
What can I do?

3. If I want to regulate a load disturbance, do I have to have a
different type of rule-base?

4. Would anyone know of any references,etc to tackle decoupling for a
multivariable process using a fuzzy controller?

Thank you for your time.

Regards

Jay

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