Journal ArticleDOI
Frequency-band complex noninteger differentiator: characterization and synthesis
TLDR
In this article, the state-of-the-art on generalized (or any order) derivatives in physics and engineering sciences is outlined for justifying the interest of the noninteger differentiation.Abstract:
The state-of-the-art on generalized (or any order) derivatives in physics and engineering sciences, is outlined for justifying the interest of the noninteger differentiation. The problems subsequent to its use in real-time operations are then set out so as to motivate the idea of synthesizing it by a recursive distribution of zeros and poles. An analysis of the existing work is also proposed to support this idea. A comprehensive study is given of the synthesis of differentiators with integer, noninteger, real or complex orders, and whose action is limited to any given frequency bandwidth. First, a definition, in the operational and frequency domains, of a frequency-band complex noninteger order differentiator, is given in a mathematical space with four dimensions which is a Banach algebra. Then, the determination of its synthesized form, by a recursive distribution of complex zeros and poles characterized by complex recursive factors, is presented. The complex noninteger differentiation order is expressed as a function of these recursive factors. The number of zeros and poles is calculated to be as low as possible while still ensuring the stability of the synthesized differentiator to be synthesized. A time validation is presented. Finally, guidelines are proposed for the conception of the synthesized differentiator.read more
Citations
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Journal ArticleDOI
Tuning and auto-tuning of fractional order controllers for industry applications
TL;DR: In this article, a method for tuning the PI λ D μ controller is proposed to fulfill five different design specifications, including gain crossover frequency, phase margin, and iso-damping property of the system.
Proceedings ArticleDOI
Fractional order control - A tutorial
TL;DR: A tutorial on fractional calculus in controls is offered which may make fractional order controllers ubiquitous in industry and several typical known fractional orders controllers are introduced and commented.
Journal ArticleDOI
A General Formulation and Solution Scheme for Fractional Optimal Control Problems
TL;DR: In this article, a general formulation and a solution scheme for a class of Fractional Optimal Control Problems (FOCPs) for those systems are presented, where the performance index of a FOCP is considered as a function of both the state and the control variables, and the dynamic constraints are expressed by a set of FDEs.
Journal ArticleDOI
Analogue Realizations of Fractional-Order Controllers
TL;DR: In this article, an approach to the design of analogue circuits, implementing fractional-order controllers, is presented, based on the use of continued fraction expansions; in the case of negative coefficients in a continued fractionexpansion, negative impedance converters is proposed.
Journal ArticleDOI
Chaos and hyperchaos in the fractional-order Rössler equations
Chunguang Li,Guanrong Chen +1 more
TL;DR: In this paper, the authors numerically studied the chaotic behaviors in the fractional-order Rossler equations and found that chaos and hyperchaos exist in such systems with order less than 3.
References
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Journal ArticleDOI
Fractional Brownian Motions, Fractional Noises and Applications
Journal ArticleDOI
How Long Is the Coast of Britain? Statistical Self-Similarity and Fractional Dimension
TL;DR: Geographical curves are so involved in their detail that their lengths are often infinite or, rather, undefinable; however, many are statistically "selfsimilar," meaning that each portion can be considered a reduced-scale image of the whole.
Journal ArticleDOI
A Theoretical Basis for the Application of Fractional Calculus to Viscoelasticity
Ronald L. Bagley,Peter J. Torvik +1 more
TL;DR: In this article, the authors established a link between molecular theories that predict the macroscopic behavior of certain viscoelastic media and an empirically developed fractional calculus approach to visco-elasticity.
Journal ArticleDOI
The CRONE Control of Resonant Plants: Application to a Flexible Transmission
TL;DR: The CRONE control strategy based on complex non-integer integration is presented and significant modifications are provided to control the resonance modes of the plant.