Results 21 to 30 of about 217,424 (259)

Dynamic Response of a Permanent Magnet Synchronous Generator to a Wind Gust

Energies, 2019
In this paper, a new analytical approach is proposed to investigate the electrical and mechanical behavior of a low-power permanent magnet synchronous generator (PMSG) in the presence of a wind gust.
Nicolae Herisanu, Vasile Marinca, Gheorghe Madescu, Florin Dragan   +3 more
doaj   +3 more sources

Extension of optimal auxiliary function method to nonlinear Sine Gordon differential equations

Partial Differential Equations in Applied Mathematics
In this paper, the new semi-analytical method called optimal auxiliary function method has been extended for finding the approximate solution of the non-linear Sine Gordon and Burger equations. The parameters of the auxiliary function’s optimum values control convergence, and they were determined using the well-known collocation approach.
Aaqib Iqbal, Rashid Nawaz, Rashid Ashraf, null Mehran, Nick Fewster-Young, null Hina   +5 more
openaire   +4 more sources

Modified optimal auxiliary functions method for approximate-analytical solutions in fractional order nonlinear Foam Drainage equations

Partial Differential Equations in Applied Mathematics
The study aims to obtain new approximate analytical solutions for the fractional order nonlinear Foam Drainage equation through a novel modification of the well-known Optimal Auxiliary Functions Method (OAFM).
Mimoon Ismael, Saba Hat, Osama Alabdali, Showkat Ahmad Lone, Ali Hasan Ali   +4 more
doaj   +2 more sources

A Solution Procedure Combining Analytical and Numerical Approaches to Investigate a Two-Degree-of-Freedom Vibro-Impact Oscillator

Mathematics, 2021
In this paper, a new approach is proposed to analyze the behavior of a nonlinear two-degree-of-freedom vibro-impact oscillator subject to a harmonic perturbing force, based on a combination of analytical and numerical approaches.
Nicolae Herisanu, Vasile Marinca
doaj   +1 more source

Analysis of the Vibro-Impact Nonlinear Damped and Forced Oscillator in the Dynamics of the Electromagnetic Actuation

Mathematics, 2023
In this work, the effect of vibro-impact nonlinear, forced, and damped oscillator on the dynamics of the electromagnetic actuation (EA) near primary resonance is studied. The vibro-impact regime is given by the presence of the Hertzian contact. The EA is
Nicolae Herisanu, Bogdan Marinca, Livija Cveticanin, Vasile Marinca   +3 more
doaj   +1 more source

An Efficient Analytical Approach to Investigate the Dynamics of a Misaligned Multirotor System

Mathematics, 2020
This paper deals with the analytical investigation of a multirotor system connected by a flexible coupling subjected to dynamic angular misalignment. A novel analytical approach is employed for this purpose, namely the optimal auxiliary functions method,
Nicolae Herisanu, Vasile Marinca
doaj   +1 more source

Value Analysis of the Machine-Building Enterprise Repair Facilities Activities [PDF]

MATEC Web of Conferences, 2021
This article is devoted to the problems of the organizational structure optimization by the method of Value Analysis (VA). The analysis of the control system is of particular relevance in modern conditions.
Mineeva Tatyana A., Kuznetsova Nadezhda A., Kalinina Nataliia E.   +2 more
doaj   +1 more source

Inexact Model: A Framework for Optimization and Variational Inequalities [PDF]

, 2020
In this paper we propose a general algorithmic framework for first-order methods in optimization in a broad sense, including minimization problems, saddle-point problems and variational inequalities.
Agafonov, Artem, Dvinskikh, Darina, Dvurechensky, Pavel, Gasnikov, Alexander, Kroshnin, Alexey, Pasechnyuk, Dmitry, Piskunova, Victorya, Stonyakin, Fedor, Tyurin, Alexander   +8 more
core   +3 more sources

Approximate Analytical Solutions to Nonlinear Oscillations of Horizontally Supported Jeffcott Rotor

Energies, 2022
The present paper focuses on nonlinear oscillations of a horizontally supported Jeffcott rotor. An approximate solution to the system of governing equations having quadratic and cubic nonlinearities is obtained in two cases of practical interest ...
Vasile Marinca, Nicolae Herisanu
doaj   +1 more source

Approximate Solution of Generalized Modified b-Equation by Optimal Auxiliary Function Method

International Journal of Emerging Multidisciplinaries: Mathematics, 2022
In this study, the implantation of a new semi-analytical method called the optimal auxiliary function method (OAFM) has been extended to partial differential equations. The adopted method was tested upon for approximate solution of generalized modified b-equation.
Aatif Ali, Laiq Zada, Rashid Nawaz
openaire   +2 more sources