期刊
NONLINEAR DYNAMICS
卷 38, 期 1-4, 页码 155-170出版社
SPRINGER
DOI: 10.1007/s11071-004-3752-x
关键词
Al-Alaoui operator; fractional differentiator; fractional-order dynamic systems; fractional-order differentiator; discretization; Tustin operator
This paper attempts to present an expository review of continued fraction expansion (CFE) based discretization schemes for fractional order differentiators defined in continuous time domain. The schemes reviewed are limited to infinite impulse response (IIR) type generating functions of first and second orders, although high-order IIR type generating functions are possible. For the first-order IIR case, the widely used Tustin operator and Al-Alaoui operator are considered. For the second order IIR case, the generating function is obtained by the stable inversion of the weighted sum of Simpson integration formula and the trapezoidal integration formula, which includes many previous discretization schemes as special cases. Numerical examples and sample codes are included for illustrations.
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