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2 Demonstratio Mathematica

2 2023

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Analytical and numerical analysis of damped harmonic oscillator model with nonlocal operators

Alharthi Nadiyah Hussain, Atangana Abdon, Alkahtani Badr S.

Demonstratio Mathematica

2023

Vol. 56, nr 1

art. no. 20220230

Nonlocal operators with different kernels were used here to obtain more general harmonic oscillator models. Power law, exponential decay, and the generalized Mittag-Leffler kernels with Delta-Dirac property have been utilized in this process. The aim of this study was to introduce into the damped harmonic oscillator model nonlocalities associated with these mentioned kernels and see the effect of each one of them when computing the Bode diagram obtained from the Laplace and the Sumudu transform. For each case, we applied both the Laplace and the Sumudu transform to obtain a solution in a complex space. For each case, we obtained the Bode diagram and the phase diagram for different values of fractional orders. We presented a detailed analysis of uniqueness and an exact solution and used numerical approximation to obtain a numerical solution.

Analysis of Cauchy problem with fractal-fractional differential operators

Alharthi Nadiyah Hussain, Atangana Abdon, Alkahtani Badr S.

Demonstratio Mathematica

2023

Vol. 56, nr 1

art. no. 20220181

Cauchy problems with fractal-fractional differential operators with a power law, exponential decay, and the generalized Mittag-Leffler kernels are considered in this work. We start with deriving some important inequalities, and then by using the linear growth and Lipchitz conditions, we derive the conditions under which these equations admit unique solutions. A numerical scheme was suggested for each case to derive a numerical solution to the equation. Some examples of fractal-fractional differential equations were presented, and their exact solutions were obtained and compared with the used numerical scheme. A nonlinear case was considered and solved, and numerical solutions were presented graphically for different values of fractional orders and fractal dimensions.