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检索条件"任意字段=6th European Conference on Numerical Methods in Geotechnical Engineering"

共 818 条记录，以下是421-430 订阅

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Toward the automation of a non linear solver coupling Harmonic Balance and Asymptotic numerical methods (HBANM)

Toward the automation of a non linear solver coupling Harmon...

引用

6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Sadoulet-Reboul, E. Lejeune, A. Applied Mechanics Department FEMTO-ST Institute 24 rue de l'épitaphe 25000 Besancon France

ISBN: (纸本)9783950353709

A new tool is proposed for the coupling of the Harmonic Balance Method and the Asymptotic numerical Method to treat non-linear dynamical problems. MANITOO which is a C++ library devoted to the resolution of non-linear problems using the Asymptotic numerical Method is specifically adapted. the resolution is automated by applying operator overloading at two levels. Firstly, a data type with appropriate arithmetic operators accounting for the harmonic variables is defined. Only simple operators (+,-,*) are overloaded in this study. Secondly, as available in MANITOO, high order derivatives, needed for the ANM, are automatically computed with a forward mode of automatic differentiation. the technique is applied to solve two classical problems with cubic non-linearities : the first one deals with a Duffing oscillator and the second consists in solving the vibration of a plate discretized with finite element and considering geometric non-linearities.

关键词： numerical methods

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Comparison of asymptotic and numerical studies of electron flow spin-polarization in quantum waveguide in magnetic field

Comparison of asymptotic and numerical studies of electron f...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Kabardov, M. Neittaanmäki, P. University of Jyväskylä Agora Center P.O. Box 35 FIN-40014 Finland

ISBN: (纸本)9783950353709

the process of electron flow spin-polarization in a waveguide with two narrows in magnetic field is investigated. Asymptotic formulas for the main characteristics of resonant tunneling for 'sufficiently small' diameters of the waveguide's narrows are presented. they contain constants, which are found numerically by solving some auxiliary problems. Also, we obtain the same characteristics of the process by means of numerical calculation of the waveguide's scattering matrix. the obtained results show that asymptotic and numerical methods give equivalent outcomes at wide band of the narrows' diameters. the numerical method becomes ill-conditioned as the diameter decreases. However, the asymptotics remains reliable at such condition. On the other hand, the asymptotics gives way to the numerical method as the diameter increases;in fact, for wide narrows the resonant tunneling vanishes by itself.

关键词： Resonant tunneling

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Computational models of nanocrystalline materials

Computational models of nanocrystalline materials

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Mrozek, Adam Burczyński, Tadeusz Institute of Computer Science Cracow University of Technology Cracow Poland Institute of Computational Mechanics and Engineering Silesian University of Technology Gliwice Poland

ISBN: (纸本)9783950353709

the methods of creation of the metallic polycrystalline structures based on the molecular dynamics simulations are described in this paper. the atomic interactions are modeled using the Lennard-Jones and the Morse potentials. the unique parameters and features (e.g. grain size) of each approach are discussed and illustrated with proper numerical examples. Additionally, the comparison between mechanical properties of the mono- and polycrystalline structures is included and the elastic constants and the stress-strain relations of the obtained molecular models of materials are presented.

关键词： Molecular dynamics

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numerical constitutive model for timber with elastic-plastic characteristics (ECCOMAS 2012)

Numerical constitutive model for timber with elastic-plastic...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Oppel, Mike Jahreis, Markus Rautenstrauch, Karl Bauhaus-University Weimar Marienstrasse 13A 99423 Weimar Germany

ISBN: (纸本)9783950353709

While computer aided analyses of load bearing structures are getting more importance, the need for realistic constitutive equations increases. Furthermore, the evaluation of experimental investigations requires appropriate numerical models. there are certain values required, especially in case of shear. the problem can be illustrated by, for example, changing the shear-value between the versions of DIN 1052 in 2004 and 2008. this paper introduces a three-dimensional constitutive model for timber products. the model is based on several lab experiments with timber under tension, compression and shear forces illustrated, for instance by the european Code EC 5. An experiment with pure shear is not possible at all. that is why another kind of investigation had to be found. Most existing numerical models use the approach of plain stress.

关键词： Constitutive models

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Hierarchy of preconditioning techniques for the solution of the Navier-Stokes equations discretized by 2nd order unstructured finite volume methods

Hierarchy of preconditioning techniques for the solution of ...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Langer, Stefan German Aerospace Center Helmholtz Association Institute of Aerodynamics and Flow Technology Lilienthalplatz 7 38108 Braunschweig Germany

ISBN: (纸本)9783950353709

this document presents a hierarchy of preconditioning techniques embedded into a multistage Runge-Kutta method applied to approximate steady state solutions of high Reynolds number viscous flows. the method is used as smoother in an agglomerated multigrid method. Different ways are suggested to construct coarse grid levels and coarse grid equations. Finally several of the possible combinations are suggested and investigated. numerical examples demonstrate the superiorities and inferiorities of some of these methods.

关键词： Navier Stokes equations

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A new approach towards the numerical integration of multibody systems with unilateral constraints

A new approach towards the numerical integration of multibod...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Esefeld, Bastian Ulbrich, Heinz Institute of Applied Mechanics Faculty of Mechanical Engineering Technische Universität München Boltzmannstr. 15 85748 Garching Germany

ISBN: (纸本)9783950353709

the topic of this work is modelling and numerical integration of rigid multibody systems with unilateral contacts. the unsteady behaviour because of impacts or stick-slip transitions in such systems lead to diverse problems in the numerical integration of the equations of motion. this paper discusses different possibilities to formulate the set-valued force laws and the dynamic equations. the structure of the resulting system of equations is closely related to two commonly used integration methods which are well suited to certain kinds of technical systems but provide drawbacks as well. By a combination of the "event-driven" and "times-tepping" integration this work wants to overcome their disadvantages. the operation and implementation of the new scheme will be discussed, especially focusing the criteria to switch between the two sub-modes. Academic examples are used for demonstration of this scheme.

关键词： Integration

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numerical heat transfer. Generalization of temporary temperature field correction method

Numerical heat transfer. Generalization of temporary tempera...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Mochnacki, Bohdan Majchrzak, Ewa Czestochowa University of Technology Dabrowskiego 69 42-201 Czestochowa Poland Silesian University of Technology Konarskiego 18a 44-100 Gliwice Poland

ISBN: (纸本)9783950353709

the paper concerns the problems of numerical solution of non-linear Fourier equation describing the transient heat conduction. In particular, the non-linearities resulting from temperature-dependent thermophysical parameters (volumetric specific heat and thermal conductivity) are considered. the basic problems presented in this paper are connected with the possibilities of artificial linearization of the task discussed (at the stage of numerical computations), in other words the methods of linear problem solution rebuilding on the solution of non-linear one are shown. the procedures discussed can be a very effective supplement for different variants of the boundary element method which, as a rule, requires a linear form of energy equation. In the paper the generalization of alternating phase truncation method (APTM), the artificial heat source method, the temporary temperature field correction method and its generalization are presented. In the final part the examples of numerical simulations are also shown.

关键词： Heat conduction

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Computer aided diagnosis of osteoporosis in human pelvic bone

Computer aided diagnosis of osteoporosis in human pelvic bon...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： John, A. Wysota, P. Department of Strength of Materials and Computational Mechanics Poland

ISBN: (纸本)9783950353709

the aim of this paper is to approach the problem of recognition of osteoporosis in human pelvic bone. the starting point was the images from tomography - on the base of obtained data the numerical model was created. Very important stage was to determinate the values of material parameters in numerical model. In the paper two methods were described. the first directly basis of data from radiological examinations (in this case it is Quantitative Computed Tomography). But with regard to difficulties with tomography data the second method was applied - the numerical simulations. the changeability of material parameters represents non-homogenous structure of bone (each finite element one can subordinate individual values of material parameters). After FEM analysis one can compare results of correct and healthy state. On the base of relationship between CT images or decreasing of bone mass and results from strength analysis the procedure to aid of detection of risky state in pelvic bone was proposed.

关键词： numerical models

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A micro-meso numerical strategy for the simulation of the degradation of laminated composites

A micro-meso numerical strategy for the simulation of the de...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Daghia, Federica Ladevèze, Pierre 61 avenue du Président Wilson 94235 Cachan cedex France

ISBN: (纸本)9783950353709

An accurate and computationally effective description of failure in laminated composites requires a physically sound description of the elementary degradations. In this work, a global-local numerical strategy which couples a mesoscale, continuum model and a microscale, hybrid discrete and continuum model is presented: while the mesoscale model enables one to carry out structural scale simulations with a reasonable computational cost, the microscale model introduces a more accurate description in the zones where significant localization of the degradation takes place. the numerical strategy proposed here is based on a non-intrusive approach, using the existing implementations of the two models, and on the definition of a mixed link which transfers only a selected part of the information between the scales.

关键词： Laminated composites

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Analysis of nonlinear dynamic behavior of micro circular plate actuator using hybrid numerical method

Analysis of nonlinear dynamic behavior of micro circular pla...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Liu, Chin-Chia Institution of Author Department of Industrial Education and Technology National Changhua University of Education Bao-Shan Campus: Number 2 Shi-Da Road Changhua 500 Taiwan

ISBN: (纸本)9783950353709

A hybrid differential transformation and finite difference scheme is used to analyze the complex nonlinear behavior of an electrostatically-actuated micro circular plate devices which is not easily analyzed using traditional methods such as perturbation theory or Galerkin approach method due to the complexity of the interactions among the electrostatic coupling effect, the residual stress and the nonlinear electrostatic force. the numerical results for the pull-in voltage are found to deviate by no more than 2.09% from the literature using various computational methods. thus, the basic validity of the hybrid numerical scheme is confirmed. Moreover, the effectiveness of a combined DC / AC loading scheme in driving the micro circular actuator is examined. It is shown that the use of an AC actuating voltage in addition to the DC driving voltage provides an effective means of tuning the dynamic response of the micro circular plate.

关键词： Perturbation techniques

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