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Browsing by Subject "Numerical methods"

Now showing items 1-20 of 24

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 (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 ...
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 ...
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 ...
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 ...
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 ...
Numerical methods evaluation for real–time thermal response tests analysis implementation

Zulli, Fabio (2019-09-05)

[ES] En los últimos años, el interés por el ahorro de energía y la reducción de las emisiones de CO2 ha crecido cada vez más, convirtiendo a las bombas de calor geotérmicas en una tecnología de alta eficiencia para sistemas ...
Numerical solution of random differential initial value problems: Multistep methods

Cortés, J.-C.; Jódar Sánchez, Lucas Antonio; Villafuerte, L. (Wiley: 12 months, 2011-01)

This paper deals with the construction of numerical methods of random initial value problems. Random linear multistep methods are presented and sufficient conditions for their mean square convergence are established. Main ...
Period-doubling bifurcations in the family of Chebyshev-Halley type methods

Cordero Barbero, Alicia; Torregrosa Sánchez, Juan Ramón; Vindel Cañas, Pura (Taylor & Francis Ltd, 2013-10-01)

The choice of a member of a parametric family of iterative methods is not always easy. The family of Chebyshev-Halley schemes is a good example of it. The analysis of bifurcation points of this family allows us to define ...
Robustness to Algorithmic Singularities and Sensitivity in Computational Kinematics

Gracia Calandin, Luis Ignacio; Angeles, J. (SAGE Publications, 2011)

A robust approach to computational kinematics intended to cope with algorithmic singularities is introduced in this article. The approach is based on the reduction of the original system of equations to a subsystem of ...
Solución numérica de problemas aerodinámicos no-estacionarios mediante el método de la malla de torbellinos

Fernández Villar, Álvaro (2018-11-05)

[ES] El objetivo de este trabajo es obtener un código numérico para determinar las condiciones de sustentación generadas en un ala por un fluido incompresible, no viscoso, irrotacional y no estacionario y utilizarlo ...