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Authors
Advisor(s)
Abstract(s)
Discrete time control systems require sample-
and-hold circuits to perform the conversion from
digital to analog. Fractional-Order Holds (FROHs) are
an interpolation between the classical zero and first
order holds and can be tuned to produce better system
performance. However, the model of the FROH
is somewhat hermetic and the design of the system
becomes unnecessarily complicated. This paper addresses
the modelling of the FROHs using the concepts
of Fractional Calculus (FC). For this purpose,
two simple fractional-order approximations are proposed
whose parameters are estimated by a genetic
algorithm. The results are simple to interpret, demonstrating
that FC is a useful tool for the analysis of these
devices.
Description
Keywords
Fractional calculus Fractional-order holds Genetic algorithms Control