Abstract
Neural networks (NN), genetic algorithms (GA), and
genetic programming (GP) are augmented with fuzzy
logic-based schemes to enhance artificial intelligence
of automated systems. Such hybrid combinations exhibit
added reasoning, adaptation, and learning ability. In
this expository article, three dominant hybrid
approaches to intelligent control are experimentally
applied to address various robotic control issues which
are currently under investigation at the NASA Center
for Autonomous Control Engineering. The hybrid
controllers consist of a hierarchical NN-fuzzy
controller applied to a direct drive motor, a GA-fuzzy
hierarchical controller applied to position control of
a flexible robot link, and a GP-fuzzy behavior based
controller applied to a mobile robot navigation task.
Various strong characteristics of each of these hybrid
combinations are discussed and used in these control
architectures. The NN-fuzzy architecture takes
advantage of NN for handling complex data patterns, the
GA-fuzzy architecture uses the ability of GA to
optimize parameters of membership functions for
improved system response, and the GP-fuzzy architecture
uses the symbolic manipulation capability of GP to
evolve fuzzy rule-sets.
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