Finite Fourier Series
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Two-dimensional beams in rectangular coordinates using the radial point interpolation method
Abstract The three-dimensional Theory of Elasticity equations lead to a complex solution for most problems in engineering. Therefore, the solutions are typically developed for reduced systems, usually symmetrical or two-dimensional. In this context, computational resources allow the reduction of these simplifications. The most recognized methods of algebraic
REM, Int. Eng. J.. Publicado em: 2020-03
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2. Development of an Analytical Method to Predict the Behaviour of the Magnetic Field in PM Linear Motors with Halbach Array
Abstract This paper describes the application of the method of separation of variables and the use of Fourier series for solving the Laplace's and Poisson's equations on the study and analysis of the magnetic field produced in a linear motor with Halbach array. Equations for predicting the 2D magnetic flux density distribution produced in the air gap were de
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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3. Free and Forced Vibration Analysis of Stepped Circular Cylindrical Shells with Several Intermediate Supports Using an Extended Wave Method; a Generalized Approach
Abstract A combination of vectorial form of wave method (VWM) with Fourier expansion series is proposed as a new vehicle for free and forced vibration analysis of stepped cylindrical shells with multiple intermediate flexible supports. The flexible supports can include springs with arbitrary properties in the possible directions. Based on Flügge thin shell
Lat. Am. j. solids struct.. Publicado em: 2016-11
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4. Transverse Motions of Rectangular Plates Resting on Elastic Foundation and Under Concentrated Masses Moving at Varying Velocities
AbstractThis study concerns the dynamic characteristics of a prestressed isotropic, rectangular plate continuously supported by an elastic foundation and carrying accelerating mass M. Closed form solutions of the governing fourth order partial differential equations with variable and singular coefficients are presented. For the two-dimensional plate problem,
Lat. Am. j. solids struct.. Publicado em: 2015-07
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5. Modelo Ionosférico Regional Parametrizado / Parametrized Regional Ionospheric Model
Neste trabalho um modelo ionosférico regional parametrizado (PARIM) foi desenvolvido e usado para calcular variações espaciais e temporais de valores de freqüência de plasma e concentração de elétrons sobre o setor brasileiro. Valores de freqüência de plasma calculados pelo SUPIM (Sheffield University Plasmasphere Ionosphere Model) modificado foram
Publicado em: 2009
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6. Parametrized Regional Ionospheric Model / Modelo Ionosférico Regional Parametrizado
Neste trabalho um modelo ionosférico regional parametrizado (PARIM) foi desenvolvido e usado para calcular variações espaciais e temporais de valores de freqüência de plasma e concentração de elétrons sobre o setor brasileiro. Valores de freqüência de plasma calculados pelo SUPIM (Sheffield University Plasmasphere Ionosphere Model) modificado foram
Publicado em: 2009
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7. EFFICIENCY ASSESSMENT OF ADVANCED MODAL ANALYSIS AS COMPARED TO TECHNIQUES BASED ON NUMERICAL INVERSE TRANSFORMS / COMPARAÇÃO DO DESEMPENHO COMPUTACIONAL DA TÉCNICA DE SUPERPOSIÇÃO MODAL AVANÇADA COM TÉCNICAS DA TRANSFORMADA DE LAPLACE
An established technique to solve time-dependent problems is the formulation of a complete frequency-domain analysis via Laplace or Fourier transforms, with subsequent ad hoc expression of results by numerical inversion. Although usually easy to implement, such a transform inversion is computationally intensive, if accurate results are desired, and liable to
Publicado em: 2008
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8. Analise numerica e experimental de fluxo de energia em estruturas
This work deals with the theoretical, numerical and experimental aspects of energy flow in structures. The mathematical formulation for computation of power flow maps is presented for beams (Euler-Bernoulli and Timoshenko) and plates (Kirchhoff and Mindlin) The physical meaning of active and reactive power is discussed. The reactive intensity is related with
Publicado em: 2001
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9. Determinação experimental de fluxo de potencia em vigas
The objective of this work is to review the mathematical equations involved in the methods of calculation of power flow in beams under bending vibration. Several methods are presented and compared. Some of these methods are traditionally employed and use approximation through finite differences in order to ca1culate power flow. Other methods use parametric m
Publicado em: 2000
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10. Configurational transitions in Fourier series-represented DNA supercoils.
A new Fourier series representation of supercoiled DNA is employed in Langevin dynamics simulations to study large-scale configurational motions of intermediate-length chains. The polymer is modeled as an ideal elastic rod subject to long-range van der Waals' interactions. The van der Waals' term prevents the self-contact of distant chain segments and also m
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11. Genetic Structure of a Population Occupying a Circular Habitat
The geographical structure of a finite population distributed continuously and homogeneously along a circular habit is explored. Selection is supposed to be absent, and the analysis is restricted to a single locus with discrete, non-overlapping generations. Assuming every mutant is new to the population, the rate of decay of genetic variability is obtained,
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12. Wall-thickness and midwall-radius variations in ventricular mechanics.
A fluid-fiber-collagen stress tensor is used to describe the rheology of the left ventricle of the heart. Linear theory is used to find the equilibrium solutions for the end-diastolic and end-systolic states of general axisymmetric shapes that are small perturbations of a thick-walled finite cylinder. The general problem can be studied by superposing the eff