scholarly journals CONSTRUCCIÓN DE MAPAS DE RUIDO CON ELEMENTOS FINITOS Y NEWMARK

2017 ◽  
Vol 22 (2) ◽  
pp. 35
Author(s):  
Irla Mantilla ◽  
Jonathan Munguia

En el presente trabajo se construye un modelo matemático para la construcción de Mapas de Ruido basado en Ecuaciones Variacionales Hiperbólicas (EVP), el cual, se obtiene de la formulación débil del problema de Contorno y Condiciones iniciales de Cauchy asociadas a Ecuaciones Diferenciales en Derivadas Parciales de tipo Hiperbólico. Para garantizar la simulación numérica del problema de propagación de la fuente de ruido se obtiene su formulación variacional en espacios de tipo Sobolev evolutivos, así se prueba la existencia y unicidad de solución del problema variacional, luego para resolver el problema se aplica el método de Galerkin con Elementos Finitos para la discretización espacial y el método de Newmark para la discretización temporal. En este trabajo se innova la técnica de preparación de la base de datos y la experimentación computacional con Matlab, obteniendo finalmente eficazmente la solución como se muestra en la convergencia del esquema numérico. Palabras clave.- Mapas de ruido, Método de Galerkin, Elementos finitos, Método de Newmark. ABSTRACTThis article uses the weak formulation of the problems Partial Hyperbolic type (VPE) for construction noise maps with finite element and Newmark in two-dimensional space. To ensure the numerical simulation of the problem of propagation of the noise source, so that proves the existence and uniqueness of the variational problem in Sobolev spaces evolutionary and applied the finite element method and method Galerkin for spatial discretization and Newmark method for the time discretization. In this work, the innovative technique of preparation of the data base and computational experimentation whit Mathlab, finally obtaining effectively the solution as shown in the convergence of the numerical scheme. Keywords.- Noise maps, Galerkin method, Finite elements, Newmark method.

2011 ◽  
Vol 94-96 ◽  
pp. 1651-1654
Author(s):  
Ke Wei Ding

Brief development process of the finite element method, foundation of quasi-conforming element has been analyzed from weak formulation generalized compatibility equations and its weak continuity condition in this paper. The quasi-conforming element methods are the exact solution of generalized compatibility equations and satisfy the weak continuity requirement naturally. The quasi-conforming element methods do not satisfy stress equilibrium conditions and concision calculating process of matrix’s athwart. The discrete precision can be predicted in prior. It also extends space of original finite element method and is landmark in computational mechanics.


1990 ◽  
Vol 112 (2) ◽  
pp. 150-154 ◽  
Author(s):  
J. L. Chenot ◽  
M. Bellet

A second order scheme for the time discretization of the elasto-plastic or elasto-viscoplastic behavior is proposed, based on a velocity approach. The complete set of equations is given for the evolution problem in the case of small rotations approximation. The method is quite general and may be applied to a large class of constitutive equations. The finite element discretization is briefly outlined and it is shown that the procedure is quite similar to that of previous displacement formulations. A numerical example concerning the sheet metal forming process, with an elasto-viscoplastic behavior and a membrane approximation, is presented. The numerical tests show a considerable improvement in accuracy for a given increment of time.


2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
D. A. León-Velasco ◽  
M. M. Morín-Castillo ◽  
J. J. Oliveros-Oliveros ◽  
T. Pérez-Becerra ◽  
J. A. Escamilla-Reyna

In this work, the Finite Element Method is used for finding the numerical solution of an elliptic problem with Henstock–Kurzweil integrable functions. In particular, Henstock–Kurzweil high oscillatory functions were considered. The weak formulation of the problem leads to integrals that are calculated using some special quadratures. Definitions and theorems were used to guarantee the existence of the integrals that appear in the weak formulation. This allowed us to apply the above formulation for the type of slope bounded variation functions. Numerical examples were developed to illustrate the ideas presented in this article.


2021 ◽  
Vol 10 (1) ◽  
pp. 14-20
Author(s):  
Lamtiur Simbolon

The process of working Air Conditioner (AC) in the cooling of a room is a process of heat transfer. This study aims to find out how the distribution of temperature in a room contained AC in it which is solved by implementing the finite element method on the energy transfer equation which is the differential equation used for heat transfer. In the finite element method, the flow field is broken down into a set of small fluid elements (domain discretization). In this study the researcher describes the space in three-dimensional space (3D), then selected linear interpolation function for 3D element, and decreases the matrix and vector elements by Galerkin method to obtain Global equation. Results from computer-assisted studies show the temperature distribution in the room.


2021 ◽  
Vol 21 (2) ◽  
pp. 203-214
Author(s):  
A.Y. Zolotukhin ◽  

The finite element method is usually used for two-dimensional space. The paper investigates the finite element method for solving the Signorini problem in three-dimensional space.


2016 ◽  
Vol 821 ◽  
pp. 129-137 ◽  
Author(s):  
Petr Sváček

This paper focuses on the mathematical modelling and the numerical approximation of the flow of two immiscible incompressible fluids,which is influenced by the surface tension and the contact angle effects. The weak formulation is introduced, discretized in time, and the finite element method is applied. The surface tension effects are taken into account using the variational reformulation. The stability of the discrete problem is increased using the implicit formulation of the surface tension. The free surface motion is treated with the aid of the level set method. The numerical results are shown.


2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
Jingjun Zhao ◽  
Jingyu Xiao ◽  
Yang Xu

We present an effective finite element method (FEM) for the multiterm time-space Riesz fractional advection-diffusion equations (MT-TS-RFADEs). We obtain the weak formulation of MT-TS-RFADEs and prove the existence and uniqueness of weak solution by the Lax-Milgram theorem. For multiterm time discretization, we use the Diethelm fractional backward finite difference method based on quadrature. For spatial discretization, we show the details of an FEM for such MT-TS-RFADEs. Then, stability and convergence of such numerical method are proved, and some numerical examples are given to match well with the main conclusions.


2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Jingjun Zhao ◽  
Jingyu Xiao ◽  
Yang Xu

A finite element method (FEM) for multiterm fractional partial differential equations (MT-FPDEs) is studied for obtaining a numerical solution effectively. The weak formulation for MT-FPDEs and the existence and uniqueness of the weak solutions are obtained by the well-known Lax-Milgram theorem. The Diethelm fractional backward difference method (DFBDM), based on quadrature for the time discretization, and FEM for the spatial discretization have been applied to MT-FPDEs. The stability and convergence for numerical methods are discussed. The numerical examples are given to match well with the main conclusions.


2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Abdallah A. Badr

We consider the linear multiterm fractional differential equation (fDE). Existence and uniqueness of the solution of such equation are discussed. We apply the finite element method (FEM) to obtain the numerical solution of this equation using Galerkin approach. A comparison, through examples, between our techniques and other previous numerical methods is established.


Sign in / Sign up

Export Citation Format

Share Document