Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3817
Título: Fractional order modelling of fractional-order holds
Autor: Machado, J. A. Tenreiro
Palavras-chave: Fractional calculus
Fractional-order holds
Genetic algorithms
Data: 2012
Editora: Springer
Relatório da Série N.º: Nonlinear Dynamics; Vol. 70, Issue 1
Resumo: 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.
Peer review: yes
URI: http://hdl.handle.net/10400.22/3817
ISSN: 0924-090X
Versão do Editor: http://link.springer.com/article/10.1007%2Fs11071-012-0495-y
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