نتایج جستجو برای: variable order fractional calculus

تعداد نتایج: 1228236  

Journal: :J. Comput. Physics 2009
Igor Podlubny Aleksei V. Chechkin Tomas Skovranek Yangquan Chen Blas M. Vinagre

A new method that enables easy and convenient discretization of partial differential equations with derivatives of arbitrary real order (so-called fractional derivatives) and delays is presented and illustrated on numerical solution of various types of fractional diffusion equation. The suggested method is the development of Podlubny’s matrix approach (Fractional Calculus and Applied Analysis, ...

Journal: :Applied sciences 2023

Unsaturated soil exhibits extremely complex engineering mechanical properties under the coupling effect of moistening and stress fields. Firstly, effective principle limit equilibrium conditions unsaturated fields were discussed based on basic principles soil. Secondly, a fractional-order model considering viscoelasticity strain hardening was established fractional calculus theory. Then, damage...

Journal: :journal of sciences, islamic republic of iran 2016
e. hesameddini a. rahimi

fractional calculus has been used to model the physical and engineering processes that have found to be best described by fractional differential equations. for that reason, we need a reliable and efficient technique for the solution of fractional differential equations. the aim of this paper is to present an analytical approximation solution for linear and nonlinear multi-order fractional diff...

Journal: :Entropy 2013
Shengxi Zhou Junyi Cao Yangquan Chen

Fractional calculus has become an increasingly popular tool for modeling the complex behaviors of physical systems from diverse domains. One of the key issues to apply fractional calculus to engineering problems is to achieve the parameter identification of fractional-order systems. A time-domain identification algorithm based on a genetic algorithm (GA) is proposed in this paper. The multi-var...

2011
RADEK MATUŠŮ Tomas Bata

The main aim of this contribution is to introduce the fundamentals of the Fractional Order Calculus (FOC) and outline its possible application to analysis and synthesis of control systems. The basic theoretical concepts of FOC are followed by techniques for potential fractional order systems description and stability investigation. Moreover, the paper offers the overview of the existing fractio...

Journal: :Energies 2023

Battery aging is one of the key challenges that electrochemical energy storage faces. Models for both cycling and calendar are valuable quantitatively assessing their contribution to overall capacity loss. Since batteries stored employed under varying conditions temperature state charge in real-life operation, availability a suitable model anticipate outcome lithium-ion dynamic great interest. ...

2008
PETER E. KLOEDEN ARNULF JENTZEN

Random ordinary differential equations (RODEs) are ordinary differential equations (ODEs) with a stochastic process in their vector field. They can be analysed pathwise using deterministic calculus, but since the driving stochastic process is usually only Hölder continuous in time, the vector field is not differentiable in the time variable, so traditional numerical schemes for ODEs do not achi...

2012
Giulio Cottone Mario Di Paola Ralf Metzler

Fractional moments have been investigated by many authors to represent the density of univariate and bivariate random variables in different contexts. Fractional moments are indeed important when the density of the random variable has inverse power-law tails and, consequently, it lacks integer order moments. In this paper, starting from the Mellin transform of the characteristic function and by...

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