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Browsing by Subject "Numerical methods"

Now showing items 1-20 of 33

A class of Steffensen type methods with optimal order of convergente

Cordero Barbero, Alicia; Torregrosa Sánchez, Juan Ramón (Elsevier, 2011-06-01)

In this paper, a family of Steffensen type methods of fourth-order convergence for solving nonlinear smooth equations is suggested. In the proposed methods, a linear combination of divided differences is used to get a ...
A comparative study to the numerical approximation of random Airy differential equation

Cortés López, Juan Carlos; Jódar Sánchez, Lucas Antonio; Romero Bauset, José Vicente; Roselló Ferragud, María Dolores (Elsevier, 2011-11)

The aim of this paper is twofold. First, we deal with the extension to the random framework of the piecewise Fröbenius method to solve Airy differential equations. This extension is based on mean square stochastic calculus. ...
A fluid dynamic model for unsteady compressible flow in wall-flow diesel particulate filters

Torregrosa Huguet, Antonio José; Serrano Cruz, José Ramón; Arnau Martínez, Francisco José; Piqueras Cabrera, Pedro (Elsevier, 2011-01)

The use of particulate filters (DPF) in Diesel engines has become in recent years the standard technology for the control of soot aerosol emissions. Once emissions reduction through the management of filtration and ...
A piecewise-linearized algorithm based on the Krylov subspace for solving stiff ODEs

Ibáñez González, Jacinto Javier; Hernández García, Vicente; Ruiz Martínez, Pedro Antonio; Arias, Enrique (Elsevier, 2011-02)

Numerical methods for solving Ordinary Differential Equations (ODEs) have received considerable attention in recent years. In this paper a piecewise-linearized algorithm based on Krylov subspaces for solving Initial Value ...
Adaptive Inertia Determination

Fernández Martín, Enrique (Universitat Politècnica de València, 2019-07-22)

[EN] The project addresses the problem of mass estimation of an unknown object with rigidly attached agents capable of exerting force on the object. A distributed control layer regulates the interaction force between the ...
An efficient integral equation technique for the analysis of arbitrarily shaped capacitive waveguide circuits

Quesada Pereira, Fernando Daniel; Vera Castejon, P.; Alvarez Melcon, Alejandro; Gimeno Martinez, Benito; Boria Esbert, Vicente Enrique (American Geophysical Union (AGU), 2011)

In this contribution a new and efficient integral equation formulation is presented for the analysis of arbitrarily shaped capacitive waveguide devices. The technique benefits from the symmetry of the structure in order ...
An Efficient Technique to Assess the Convergence of the Multimode Equivalent Network for Waveguide Devices

Gomez Molina, Celia; Quesada Pereira, Fernando; Alvarez Melcon, Alejandro; Boria Esbert, Vicente Enrique; Guglielmi, Marco (Institute of Electrical and Electronics Engineers, 2018-02)

[EN] Numerical methods are widely used to analyze and design microwave components for communication applications.In the implementation of any numerical technique, however, there are always a set of parameters ...
Assessment of a methodology to mesh the spatial domain in the proximity of the boundary conditions for one-dimensional gas dynamic calculation

J.R. Serrano; Arnau Martínez, Francisco José; Piqueras, P.; Reyes Belmonte, Miguel Ángel (Elsevier, 2011)

[EN] Solution of governing equations for one-dimensional compressible unsteady flow has been performed traditionally using a homogenously distributed spatial mesh. In the resulting node structure, the internal nodes are ...
Comparison between the finite differences, finite volume and finite element methods for the modelling of convective drying of fruit slices

Castro, Adriana; Mayorga, Edgar; Moreno, Fabian (Editorial Universitat Politècnica de València, 2018-09-07)

[EN] Three numerical methods, finite differences, finite volume and finite element, were compared to know their convenience in the simulation of convective drying of fruit slices. The mathematical treatment, the stability, ...
Compensation of the impact of low-cost manufacturing techniques in the design of E-plane multiport waveguide junctions

San Blas Oltra, Ángel Antonio; Roca, J. M.; Cogollos Borras, Santiago; Morro, J. V.; Boria Esbert, Vicente Enrique; Gimeno Martinez, Benito (American Geophysical Union (AGU), 2016-06)

In this work, a full-wave tool for the accurate analysis and design of compensated E-plane multiport junctions is proposed. The implemented tool is capable of evaluating the undesired effects related to the use of low-cost ...
Density function of random differential equations via finite difference schemes: a theoretical analysis of a random diffusion-reaction Poisson-type problem

Calatayud, J.; Cortés, J.-C.; Díaz, J.A.; Jornet, M. (Taylor & Francis, 2020-05-18)

[EN] A computational approach to approximate the probability density function of random differential equations is based on transformation of random variables and finite difference schemes. The theoretical analysis of this ...
Desarrollo e implementación de una aplicación informática con Matlab para la encriptación fractal del imágenes basadas en el Cifrado de Hill

Viguer Güémez, Albert (Universitat Politècnica de València, 2020-11-13)

[ES] En este trabajo final de grado se presenta una novedosa aplicación del álgebra matricial y la aritmética modular al proceso de encriptación de imágenes, a partir de los procesos iterativos en el plano complejo que dan ...
Drazin inverse based numerical methods for singular linear differential systems

Coll Aliaga, Peregrina del Carmen; Ginestar Peiro, Damián; Sánchez Juan, Elena; Thome Coppo, Néstor Javier (ELSEVIER SCI LTD, 2012)

[EN] In this paper, numerical methods for the solution of linear singular differential system are analyzed. The numerical solution of initial value problem by means of a corresponding finite difference approach and a ...
Dynamic Modeling and Stability Analysis of Stochastic Multi-Physical Systems Applied to Electric Power Systems

González Zumba, Jorge Andrés (Universitat Politècnica de València, 2021-01-10)

[ES] La naturaleza aleatoria que caracteriza algunos fenómenos en sistemas físicos reales (e.g., ingeniería, biología, economía, finanzas, epidemiología y otros) nos ha planteado el desafío de un cambio de paradigma del ...
Ecoesferas: una propuesta de modelización en el ámbito de la escuela de Caminos

Anton, Aron; de Julián, Gregorio; Delicado, Agustín; Sánchez, Paula; Valero, Daniel; García Raffi, Lluís M.; Sánchez Pérez, Enrique A. (Universitat Politècnica de València, 2013-06-02)

[EN] This article is the result of the work developed by students in the subject “Introducción a las Técnicas de Modelización Matemática" at School of Civil Engineering in Valencia. The topic was proposed by one of the ...
Efficient high-order methods based on golden ratio for nonlinear system

Cordero Barbero, Alicia; Hueso Pagoaga, José Luís; Martínez Molada, Eulalia; Torregrosa Sánchez, Juan Ramón (Elsevier, 2011-01-01)

We derive new iterative methods with order of convergence four or higher, for solving nonlinear systems, by composing iteratively golden ratio methods with a modified Newton's method. We use different efficiency indices ...
Experimental tests of slender reinforced concrete columns under combined axial load and lateral force

BARRERA PUERTO, ANGELA; Bonet Senach, José Luís; Romero, Manuel L.; Miguel Sosa, Pedro (Elsevier, 2011-12)

The use of high strength concrete (HSC) in columns has become more frequent since a substantial reduction of the cross-section is obtained, meaning that slenderness increases for the same axial load and length, producing ...
Fourier methods for the perturbed harmonic oscillator in linear and nonlinear Schrödinger equations

Bader, Philipp; Blanes Zamora, Sergio (American Physical Society, 2011)

[EN] We consider the numerical integration of the Gross-Pitaevskii equation with a potential trap given by a time-dependent harmonic potential or a small perturbation thereof. Splitting methods are frequently used with ...
Laminar Boundary Layer and Active Control of Fluid Flow

Valero Paredes, Sandra (Universitat Politècnica de València, 2020-04-30)

[ES] El presente trabajo es un estudio teórico de las características principales de la capa límite laminar de un flujo fluido. Se ha investigado desde el concepto de capa límite hasta su importancia en la actualidad. ...
New efficient numerical methods to describe the heat transfer in a solid medium

Ponsoda Miralles, Enrique; Blanes Zamora, Sergio; Bader, Philipp (Elsevier, 2011-10)

The analysis of heat conduction through a solid with heat generation leads to a linear matrix differential equation with separated boundary conditions. We present a symmetric second order exponential integrator for the ...