Tesis sobre el tema "Hybrid method"
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Kang, David Sung-Soo. "Hybrid stress finite element method". Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/14973.
Texto completoMICROFICHE COPY AVAILABLE IN ARCHIVES AND AERO
Bibliography: leaves 257-264.
by David Sung-Soo Kang.
Ph.D.
Slemp, Wesley Campbell Hop. "Integrated Sinc Method for Composite and Hybrid Structures". Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77111.
Texto completoPh. D.
Kooreman, Gabriel. "Consistent hybrid diffusion-transport spatial homogenization method". Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52950.
Texto completoLiu, Yunshan. "P-adaptive hybrid/mixed finite element method /". The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487950153602937.
Texto completoMsiza, Andrew Khutso. "Hybrid synthesis method for mass exchange networks". Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/5434.
Texto completoProcess synthesis can be approached from three techniques: heuristics, physical and thermodynamic insight, and mathematical programming. Hybrid methods where two or all of the synthesis methods are combined are now becoming used, taking advantage of the combined strength of the individual techniques. In this thesis the option of combining pinch analysis (a physical and thermodynamic insight-based approach) and superstructure-based programming is explored.
Baboulet, Olivier. "Path Exchange Method for Hybrid Life-Cycle Assessment". Thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9930.
Texto completoTo keep process-specificity while extending system boundaries hybrid techniques were developed allowing the micro structure of the important parts of a system to be revealed at the same time the entire economic system in which the system is embedded to be covered. Despite the substantial improvements bestowed by hybrid techniques some downsides still hold. Tiered hybrid LCA first does not model feedbacks whereas the relationship between the process-based system and the input-output based system is interactive and second it may suffer from double counting incidents as a process may be instigated in both the IO and LCI data. Integrated hybrid LCA overcomes those aforementioned pitfalls but only at a price of high labor and data intensity. This work aims to elaborate a new hybridisation method that avoids previously mentioned drawbacks. This technique is designed to not operate anymore at the matrix level as is the case for current hybridisation techniques but at the structural path level, per se the finest level of detail possible for the disaggregation of the Leontief inverse, and as such an ad hoc basis to carry out an hybrid analysis. It is argued that the method presented here constitutes a culmination amongst hybridization techniques. Its operability and capabilities are demonstrated before an interpretation from an input-output vantage point is carried out on a case-study not to be found in the literature, a comparison across the faculties of a university.
Robertson, Bradford E. "A hybrid probabilistic method to estimate design margin". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50375.
Texto completoEckbo, Ryan. "Simulating vortex ring collisions: extending the hybrid method". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18476.
Texto completoLes filaments de vortex sont des tubes de vorticité isolés, et il est important de comprendre leur comportement pour caractériser les fluides dans lesquels ils apparaissent. La reconnection de vortex, i.e. le changement de topologie qui survient lorsque des filaments entrent en collision, est un phénomène particulier qui ne peut être modelisé par la méthode traditionnelle des vortex, ce qui mène (Ghuneim, 2002, Ghuneim et al., 2002) à l'intégrer avec la méthode des ensembles de niveau. Cependant, la complexité de l'implémentation traditionnelle de la méthode des ensembles de niveau limite grandement le type de simulations qui sont possibles. Motivés par ceci, nous proposons une nouvelle implémentation qui organise les voxels dans une structure de données en arbre, ce qui permet des évolutions de filaments plus longues, plus étendues, plus précises et plus versatiles. Un méchanisme simplifié pour gérer les reconnections est aussi proposé. Nous démontrons les avantages de la méthode hybride étendue et de la nouvelle implémentation par ensembles de niveau par des simulations d'une variété d'évolutions de filaments avec des événements de reconnection.
Atalianis, Christos Andreas. "Hydrodynamic analysis of structures by a hybrid method". Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283649.
Texto completoCOSSIO, MARCO ULISES DE LA QUINTANA. "SENSIVITY ANALYSIS WITH THE HYBRID BOUNDARY ELEMENT METHOD". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1998. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1405@1.
Texto completoEste trabalho apresenta um estudo do cálculo de sensibilidades necessário para a análise de problemas inversos e de otimização, usando o método híbrido dos elementos de contorno. Com esta finalidade, é desenvolvida uma formulação que permite obter as sensibilidades à mudança de forma, por diferenciação implícita das integrais de contorno, de uma estrutura já discretizada. Demonstra-se que as sensibilidades das matrizes obtidas desta formulação apresentam propriedades espectrais definidas, que são derivadas da formulação básica do método híbrido dos elementos de contorno. Todo o desenvolvimento é feito para um problema da elastostática tridimensional, embora sejam apresentadas apenas aplicações de problemas bidimensionais e de potencial, como casos particulares. As singularidades que surgem na integração no cálculo das sensibilidades são facilmente solucionáveis a partir das integrais da formulação básica do método híbrido dos elementos de contorno. As implementações numéricas são feitas utilizando a linguagem de programação Maple V release 3. Para ambos os casos, de potencial e elasticidade bidimensional, são usados elementos lineares para a representação do contorno. São apresentadas comparações entre os resultados analíticos obtidos através desta formulação com os resultados obtidos usando a técnica de diferenças finitas (centradas), com o objetivo de demonstrar a eficiência e precisão da metodologia aqui desenvolvida.
The present work describes a formulation for computing design sensitivities required in inverse problems and shape optimization of solid objects, in the frame of the hybrid boundary element method. The so-called direct differentiation method is applied in order to calculate the gradients, i.e. the implicit diferentiation of the discretized boundary is performed, resulting in a general and efficient analysis technique for shape design sensitivity analysis of all structural quantities. It is demonstrated that the resulting sensitivities matrices present some useful spectral properties, which are related to the matrix spectral properties of the basic hybrid formulation. This formulation is valid for tridimensional solids, although only potential and bidimensional applications are considered as particular cases. The singularities that appear in the resulting boundary integrals are exactly the same which have already been dealt with in the basic formulation. The analytical and numerical procedures were performed by using the mathematical package Maple V release 3. Linear boundary elements were used for both potential and elasticity problems. Numerical results obtained by the present procedure are compared to finite differences results to demonstrate the effectiveness of the present formulation.
Este trabajo presenta un estudio del cálculo de sensibilidades, que tiene gran importancia en el análisis de problemas inversos y de optimización, usando el método híbrido de los elementos de contorno. Con esta finalidad, se desarrolla una formulación que permite obtener las sensibilidades al cambio de forma de una extructura ya discretizada, por diferenciación implícita de las integrales de contorno. Se demuestra que las sensibilidades de las matrices obtenidas por esta formulación presentan propriedades espectrales definidas, que son derivadas de la formulación básica del método híbrido de los elementos de contorno. El desarrollo de la formulación se realiza para un problema de elastostática tridimensional, aunque se presentan apenas las aplicaciones de problemas bidimensionales y de potencial, como casos particulares. Las singularidades que surgen en la integración en el cálculo de las sensibilidades pueden ser fácilmente resueltas a partir de las integrales de la formulación básica del método híbrido de los elementos de contorno. La implementación numérica utiliza el lenguaje de programación Maple V release 3. Para los casos de potencial y elasticidad bidimensional, se utilizan elementos lineales para la representación del contorno. Se comparan los resultados analíticos obtenidos a través de esta formulación con los resultados obtenidos usando la técnica de diferencias finitas (centradas), con el objetivo de demostrar la eficiencia y precisión de la metodología aqui desarrollada.
Takahashi, Hitoshi. "Study of Double-Hypernuclei with Hybrid-Emulsion Method". 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/149060.
Texto completoDao, Tuan Anh. "A stable and accurate hybrid FE-FD method". Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-396844.
Texto completoRadiy, Mamon. "A hybrid method for capacitated vehicle routing problem". Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/69.
Texto completoKhlifi, Rachid. "Hybrid space discretizing method -method of moments for numerical modeling of transient interference". kostenfrei, 2007. http://mediatum2.ub.tum.de/doc/620327/document.pdf.
Texto completoHagdahl, Stefan. "Hybrid methods for computational electromagnetics in the frequency domain". Licentiate thesis, KTH, Numerical Analysis and Computer Science, NADA, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1655.
Texto completoIn this thesis we study hybrid numerical methods to be usedin computational electromagnetics. We restrict the methods tospectral domain and scattering problems. The hybrids consist ofcombinations of Boundary Element Methods and Geometrical Theoryof Diffraction.
In the thesis three hybrid methods will be presented. Onemethod has been developped from a theoretical idea to anindustrial code. The two other methods will be presented mainlyfrom a theoretical perspective. We will also give shortintroductions to the Boundary Element Method and theGeometrical Theory of Diffraction from a theoretical andimplementational point of view.
Keywords:Maxwells equations, Geometrical Theoryof Diffraction, Boundary Element Method, Hybrid methods,Electromagnetic Scattering
Eiderbrant, Tobias. "Automating a test method for a hybrid test environment". Thesis, Linköping University, Department of Computer and Information Science, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57646.
Texto completoEricsson has a very big and expensive test environment with a lot of GSM AXE equipment. In order to decrease the cost of testing Ericsson has developed a combination of simulated and real hardware, the Hybrid Test Environment (HTE). There is no formal supervision and testing of the HTE system today and this has left the HTE system unstable and the testers have been avoiding using HTE. It is important for Ericsson that the confidence for HTE will increase. The goal of this thesis is to produce a method for testing the HTE system. An automated test tool has been implemented in order to monitor and test the HTE system. During the two weeks that the test tool has been operational it has discovered 4 servers in 3 different HTE rigs that malfunctioned. These servers were fixed and were operational before the end-users could discover any problem.
MOSQUEIRA, DANIEL HUAMAN. "THE HYBRID BOUNDARY ELEMENT METHOD FOR GRADIENT ELASTICITY PROBLEMS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=23938@1.
Texto completoCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Atualmente está bem difundido o uso de novas modelagens matemáticas para o estudo do comportamento de micro e nano sistemas mecânicos e eléctricos. O problema de escala é notável quando o tamanho das moléculas, partículas, grãos ou cristais de um sólido é relativamente considerável em relação ao comprimento do microdispositivo. Nesses casos a teoria clássica dos meios contínuos não descreve apropriadamente a solicitação estrutural e é necessária uma abordagem mais geral através de teorias generalizadas não-clássicas que contém a elasticidade clássica como um caso particular delas, onde os parâmetros constitutivos que representam às partículas são desprezíveis. Quando os efeitos microestruturais são importantes, o comportamento não responde como um material homogêneo se não como um material homogêneo. Cem anos atrás os irmãos Cosserat desenvolveram uma teoria de grãos rígidos imersos dentro de um macromeio elástico; posteriormente Toupin, Mindlin e outros pesquisadores na década de 60 formularam a chamada teoria gradiente de deformações, que recentemente é um objeto de muitas investigações analíticas e experimentais. Na década de oitenta, Aifantis e colaboradores conseguiram desenvolver uma teoria de gradiente de deformações simplificada, baseada em só uma constante elástica adicional não-clássica representativa da energia de deformação volumétrica para caracterizar satisfatoriamente os padrões dos fenômenos não-clássicos. Beskos e colaboradores estenderam o campo de aplicações da proposta inicial de Aifantis e fizeram as primeira implementações de elementos de contorno 2D e 3D para análises de elasticidade gradiente estática, no domínio da frequência e a mecânica da fratura. Desde o tempo de Toupin e Mindlin, procura-se estabelecer uma base variacional da teoria e uma formulação consistente das condições de contorno cinemáticas e de equilíbrio, o que parece ter tido êxito com os recentes trabalhos de Amanatidou e Aravas. Esta tese apresenta a formulação do método híbrido de elementos de contorno e finitos na elasticidade gradiente desenvolvida por Dumont e Huamán decompondo o potencial de Hellinger-Reissner em dois princípios de trabalhos virtuais: o primeiro em deslocamentos virtuais e o segundo em forças virtuais. Com esta finalidade é considerado além dos parâmetros clássicos, o trabalho realizado pelas tensões, deformações, forças e deslocamentos não-clássicos. É apresentado o desenvoltimento das soluções fundamentais singulares e polinomiais atráves das equações diferenciais de sexta ordem obtidas da equação de equilíbrio em termos de deslocamento na elasticidade gradiente. É apresentada também a aplicaçõ do método híbrido de contorno para problemas de tensão axial unidimensional e flexão bidimensional de vigas. Finalmente mostra-se a aplicação numérica do método em elementos finitos, é verificado o patch test de elementos finitos de diferentes ordem e mostra-se também análises de convergência.
The use of new mathematical modeling in the study of micro and Nano electro mechanical systems is currently becoming widespread. The scaling problem is apparent when the length of molecules, particles or grains immersed in the material is relatively important compared with the whole micro device dimension. Under this approach the classical theories of mechanics cannot describe suitably the structural requirement and it is necessary a more general outlook through non classical generalized theories which enclose the classical elasticity as a particular case where the non-classical constitutive parameters are negligible. When the microstructural effects are important, the material does not respond as a homogeneous but as a non-homogeneous one. A hundred years ago Cosserat brothers formulated a new theory of rigid grains which were embedded in an elastic macro medium; later Toupin, Mindlin along others researchers in 1960s developed a gradient strain theory which has been recently the source of many analystics and experimental investigations. In 1980s Ainfantis et al could develop a simplified strain gradient theory with just one additional non classical elastic constant which represents the volumetric elastic strain energy and characterized successfully the whole non classical pattern phenomenon. Beskos et al extended the treatment proposed initially by Aifantis and developed the first numerical applications for 2D and 3D boundary element methods and solved static as dynamic and crack problems. Since the times of Toupin and Mindlin it is looking for to establish a variational theory with a consistent cinematic and equilibrium boundary conditions, which seemed to have had success in the recent works of Amanatiodou and Aravas. This work presents the formulation of the hybrid boundary and finite element methods under the strain gradient scope which were developed by Dumont and Huamán through the versatile decomposition of the Hellinger-Reissner potential in two work principles: the displacements virtual work and the forces virtual work; both principles contain the virtual work performed by the non-classical magnitudes. Following, it is presented the complete development of singular and polynominal fundamental solutions abtained through the sixth order strain gradient differential equilibrium equations in terms of displacements. Next it is shown an application of the method to unidimensional truss element and bidimensional beam. Finally, it is presented a numerical application to strain gradient finite element, it is checked the patch tests to different elements orders and it is also shown a series of convergence analysis.
Quinelato, Thiago de Oliveira. "Mixed hybrid finite element method in elasticity and poroelasticity". Laboratório Nacional de Computação Científica, 2017. https://tede.lncc.br/handle/tede/273.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Esta tese é focada no desenvolvimento e na análise de aproximações em dimensão finita das equações que descrevem problemas de elasticidade linear e poroelasticidade. A estratégia de aproximação é baseada em formulações de elementos finitos mistas hibridas desses problemas e a construção dos espaços de dimensão finita é guiada por várias propriedades desejadas: continuidade das trações (conservação do momento linear), simetria do tensor de tensão (conservação do momento angular), número reduzido de graus de liberdade globais e robustez sob distorção de malha. A principal dificuldade está relacionada com o atendimento simultâneo da condição inf-sup e da simetria do tensor de tensão. O ultimo requisito é relaxado, sendo satisfeito de maneira fraca pela introdução de um multiplicador de Lagrange. A maior contribuição é o desenvolvimento e a análise de espaços de dimensão finita estáveis para aproximação mista dos problemas de elasticidade linear e poroelasticidade em malhas quadrilaterais arbitrárias. Esses espaços são capazes de fornecer convergência com taxa ótima do campo de tensão na norma H(div) em malhas de quadriláteros arbitrários, o que é provado pela análise numérica e confirmado por experimentação.
This thesis is focused on the development and analysis of finite dimensional approximations of the equations describing linear elasticity and poroelasticity problems. The approximation strategy is based on mixed hybrid finite element formulations of those problems and the construction of the finite dimensional spaces is guided by several desired properties: continuity of the tractions (conservation of linear momentum), symmetry of the stress tensor (conservation of angular momentum), reduced number of global degrees of freedom, and robustness under mesh distortion. The main difficulty is related with the simultaneous fulfillment of the inf-sup condition and the symmetry of the stress tensor. The last requirement is relaxed, being enforced in the weak sense through the introduction of a Lagrange multiplier. The main contribution is the development and analysis of stable finite dimensional spaces for mixed approximation of linear elasticity and poroelasticity problems on arbitrary quadrilateral meshes. These spaces are capable of providing optimal order convergence of the stress field in the H(div)-norm on meshes of arbitrary quadrilaterals, which is proved by numerical analysis and confirmed by experimentation.
Whitacre, Jonathan H. "A Hybrid Method For Solving A Single Nonlinear Equation". Youngstown State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1296145853.
Texto completoBiglarifadafan, Ali. "A general hybrid force-based method for structural analysis". Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/5266/.
Texto completoChatzilias, Dimitris. "A Hybrid Difficulty Balancing Method on “Casual” Mobile Game". Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173953.
Texto completoOlander, Jonathan. "Comparison of the hybrid and thermal lattice-Boltzmann methods". Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31826.
Texto completoCommittee Chair: Aidun, Cyrus; Committee Member: Graham, Samuel; Committee Member: Joshi, Yogendra. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Tsoi, Sai Hong. "On a hybrid finite element with weak Kirchhoff assumption". HKBU Institutional Repository, 2000. http://repository.hkbu.edu.hk/etd_ra/218.
Texto completoLiu, Wenjie. "A multiscale hybrid method for materials containing defects and inhomogeneities /". Search for this dissertation online, 2006. http://www.lib.umi.com/cr/ksu/main.
Texto completoArbault, Damien. "Globalized impacts International trade accounting in a hybrid LCI method". Thesis, KTH, Urban and Regional Studies, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24863.
Texto completoWiedermann-Ondrej, Nadine. "Hybrid Instruments and the Indirect Credit Method - Does it work?" SFB International Tax Coordination, WU Vienna University of Economics and Business, 2007. http://epub.wu.ac.at/1018/1/document.pdf.
Texto completoSeries: Discussion Papers SFB International Tax Coordination
Schlottke-Lakemper, Michael [Verfasser]. "A Direct-Hybrid Method for Aeroacoustic Analysis / Michael Schlottke-Lakemper". München : Verlag Dr. Hut, 2017. http://d-nb.info/1135596190/34.
Texto completoCAVACO, MARCO ANTONIO MARTINS. "AN HYBRID METHOD FOR PHOTOELASTIC ANALYSIS OF ORTHOTROPIC COMPOSITE MATERIALS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1990. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=20636@1.
Texto completoEste trabalho apresenta uma nova técnica para análise de tensões em modelos fotoelásticos planos. Essa técnica baseia-se na determinação de coeficientes para funções de tensão aproximadas, através da coleta dos dados extraídos de ordens de franjas isocromáticas e de condições de contorno de modelos fotoelásticos planos. O modelo tem como vantagens a determinação de fatores de concentração de tensões com boa precisão, além de permitir a separação de tensões em pequenas ou grandes regiões de modelos fotoelásticos planos, sem requerer a leitura de franjas isoclínicas. Uma outra grande vantagem está na possibilidade imediata de acoplamento desse método com um analisador de imagens para determinação automática de Kt. Foram encontrados excelentes resultados em problemas onde haviam concentradores de tensão e no estudo de regiões próximas a cargas concentradas. A determinação dos coeficientes das funções foi feita através de um programa escrito em BASIC, que utiliza o método de Newton-Raphson em conjunto com o ajuste dos dados por mínimos quadrados. Vários exemplos foram estudados com o objetivo de avaliar sua performance. Entre eles estão: carga concentrada sobre uma superfície semi-infinita; placa infinita e finita com futo circular sujeita à tração; disco circular submetidos à cargas diametrais compressivas; viga reta carregada à tração constante e a momento constante; e barra com duplo entalhe em U submetida a momento constante.
This work presents a new technique for improving stress analysis in photoelastic plane models. This technique is based on the determination of coefficients of approximated stress functions through the collection of isochromatic fringe data, and by the applications of boundary conditions to photoelastic plane models. The technique has as advantages the accurate determination of stress concentration factors and the stress without the need for collecting isoclinic fringe data. Another great advantage, is the immediate use of this method coupled with an image analyzer device for automatic extraction of Kt. Excellent results were found in problems where stress concentration or concentrated loading were present. The coefficients of the stress functions were determined by a BASIC program, using a Newton-Raphson technique coupled to a least square algorithm. Many example were tested to evaluate its performance. Among them are: concentrated force at a point of a straight boundary; infinite and finite plate with circular holes subjected to uniaxial tensile loads; circular disk under compressive diametral forces; bar subjected to pure tensile and pure bending loads; and a double U-notched bar under pure bending.
CASTRO, LUIZ OTAVIO GUERREIRO DE. "AN HYBRID METHOD FOR PHOTOELASTIC ANALYSIS OF ORTHOTROPIC COMPOSITE MATERIALS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1992. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24947@1.
Texto completoFUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
Este trabalho tem como finalidade a apresentação de um método novo e eficiente para a análise e separação de tensões em materiais compostos (conjugados). O método híbrido consiste no acoplamento da lei ótica para materiais ortotrópicos com as equações de compatibilidade e equilíbrio para corpos anisotrópicos. As soluções destas equações são representadas por funções analíticas de variáveis complexas. O método propõe que se aproximem as funções analíticas por funções polinomiais. Estas funções aproximadas são determinadas através do acoplamento das equações de equilíbrio e compatibilidade com dados experimentais, obtidos da resposta fotoelástica, e com métodos numéricos (Newton-Raphson e mínimos quadrados), possibilitando a determinação dos coeficientes integrantes das funções polinomiais. O método apresenta como principal vantagem a capacidade de separar as tensões, com precisão, em pequenas ou mesmo em grandes regiões de modelos fotoelásticos planos, sem requerer a leitura de franjas isoclínicas. São apresentados excelentes resultados obtidos com a aplicação do método desenvolvido em alguns casos específicos, envolvendo um material composto por uma matriz de resina reforçada por fibras de vidro com arranjo unidirecional. Três casos são objetos de estudo: A) Barra retangular submetida à tração, com a direção do reforço paralela a direção da carga aplicada. B) Barra retangular submetida à tração. com direção do reforço fazendo um ângulo qualquer com a direção da carga aplicada. C) Plano semi-infinito submetido à carga concentrada atuando perpendicularmente à direção do reforço.
The objective of this paper is to present a new and efficient method to analyse and separate stresses in composite materials. The hybrid method associates the stress-optic law for orthotropic materials with the compatibility and equlibrium equations for anisotropic bodies. The solutions of these equatios are represented by analytical functions of complex variables. The method proposes that these analytical functions be approximate by polynomial functions. These aapproximate functions are determined by the association of the compatibility equilibrium equatios with experimental data (obtained from the photoelastic response) and numerical methods (Newton-Raphson and least squares method). The method presents as a major advantage the capacity to separate stresses precisely in small or even in large regions of photoelastic plane models, without needign to collect isoclinic fringe data. The thesis presents excellent results obtained by the application of the developed method in some specific cases, where a fiber glass reinforced epoxy resin is used as a model material, will be shown. Three cases are studied: A) Rectangular bar in tension with the fiber reinforcement axis parallel to the applied load direction B) Rectangular bar in tension with the fiber reinforcement axis making a known angle with the applied load direction C) Semi-infinite plane subjected to a concentrated edge load which is perpendicular to the fiber reinforcement axis.
Docherty, Stephanie Y. "Rarefied gas flows in microscale geometries : a hybrid simulation method". Thesis, University of Strathclyde, 2015. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25916.
Texto completoIchikawa, Atsuko. "Study of S=-2 Nuclear Systems with Hybrid Emulsion Method". 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150816.
Texto completoKyoto University (京都大学)
0048
新制・課程博士
博士(理学)
甲第8712号
理博第2284号
新制||理||1199(附属図書館)
UT51-2001-F42
京都大学大学院理学研究科物理学・宇宙物理学専攻
(主査)教授 今井 憲一, 教授 西川 公一郎, 教授 笹尾 登
学位規則第4条第1項該当
Piellard, Mélanie. "A hybrid method for computational aeroacoustics applied to confined geometries". Ecully, Ecole centrale de Lyon, 2008. http://bibli.ec-lyon.fr/exl-doc/TH_T2175_mpiellard.pdf.
Texto completoThis PhD work deals with the development of a Computational Aeroacoustics (CAA) method for industrial applications. The constraints linked to this context impose the choice of a hybrid method based on the use of commercial computing codes adapted to turbulent low velocity flows. This approach is based on Lighthill’s Acoustic Analogy, and its application involves two steps. In the first step, the unsteady turbulent flow is computed to determine acoustic source terms, the latter being then propagated in a second step to produce the radiated acoustic field. The implementation is a variational formulation of Lighthill’s Acoustic Analogy with the coupling of Fluent CFD code and Actran/LA acoustic code. It is well adapted to the industry since complex geometries are easily handled in both finite volumes (Fluent) and finite elements (Actran/LA) methods. Two academic configurations are considered. The acoustic radiation produced by two corotating vortices with and without mean flow is first studied for validation. In particular, the goal is to show the necessity to take the local mean flow field into account when computing the source term. A Direct Numerical Simulation (DNS) is therefore performed within Fluent to yield a reference solution; this also reveals the rotating quadrupole nature of the acoustic source. The hybrid method is then applied with success: the source terms are computed from the velocity fields of the DNS, and then propagated to the far field in the spectral domain within Actran/LA. A second verification, in addition to the comparison with DNS results, consists in the analytical resolution of Lighthill’s equation using the Lighthill’s tensor obtained from the DNS. Another important conclusion of this study is that the presence of a mean flow field in both the propagation and source regions only acts on the acoustic waves refraction; however, it is not required to account for it in the source term determination. The second academic study concerns the handling of outgoing turbulent structures from the computing domain. These indeed produce a spurious dipolar acoustic radiation, of numeric nature purely, and with levels high enough to perturb the whole solution. This issue is modeled here with the convection of a perfect vortex through a virtual boundary. Several spatial filters are tested to smooth source terms down to zero at the boundary; the optimal filter tuning depends on the size and convection velocity of the structures to be dissipated. Finally, a real application is considered, the ducted diaphragm at low Mach number. A first Large Eddy Simulation (LES) is performed on a reduced geometry consisting of 10% of the total span. In spite of the model limitations, mainly due to the span reduction preventing a correct three-dimensional development of turbulence, the associated twodimensional acoustic computation yields consistent results. The full scale 3D flow field is then studied, with similarly a LES in which aerodynamic features conform well with the reference DNS. In order to reduce the acoustic model size, source terms are decimated through spatial interpolation. After propagation, the acoustic results suffer from this approximation that would require a more thorough validation
Al-Deghaither, Saleh E. "A hybrid FE-BE method for dynamic soil-structure interaction /". The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487858417983533.
Texto completoJanzon, Alexandra. "Applications and Limitations of the Hybrid L1/L2Multicarrier Analysis Method". Thesis, Luleå tekniska universitet, Rymdteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86347.
Texto completoSasi, Kumar Sarath K. "A multi-exchange heuristic for formation of balanced disjoint rings". Texas A&M University, 2005. http://hdl.handle.net/1969.1/4428.
Texto completo吳牧哲. "A Hybrid Method of Text Mining". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/67978399864138435975.
Texto completo國立彰化師範大學
資訊工程學系
97
「There are estimates that 85% of business information lives in the form of text 」. It is obvious that the structure of most data in real world is not rigorous. In the age of information explosion, it is very convenient to get information through the network, but it will make people difficult to figure out the hidden knowledge in a large amount of information. Therefore, lots of searching or indexing applications have been developed to help people to solve above problem. For example Yahoo and Google are two of these kinds of applications. Text mining is an important branch of data mining; it is a process to extract knowledge and information from unstructured text data sets by applying the techniques of data mining. The mined results can be applied to the development or improvement of a search engine system. In this thesis a two steps clustering method has been proposed to group documents based on the characteristics of terms. It takes the advantages of k-means and fuzzy c-means clustering algorithms. At the beginning, the proposed method constructs groups of terms from collected text data, and finds out the relationships between terms and formed groups based one the ideas of co-occurrence. When constructing the vector spaces of documents, a switch mechanism is introduced to decide whether TF-IDF method will be adopted or not. Finally, the vector spaces of documents will be input into k-means algorithm for clustering. The experiments show that the proposed method can yield robust results than clustering text data by applying k-means algorithm alone.
YIE, ZONG-CHENG y 謝宗城. "A hybrid method for root-locus plotting". Thesis, 1988. http://ndltd.ncl.edu.tw/handle/42986335762330826354.
Texto completoLiao, Yu-Sheng y 廖祐笙. "A Study of Hybrid GA/CSP Method". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/42775500618179706576.
Texto completo東海大學
工業工程學系
87
Genetic Algorithm (GA) is an effective and sound searching method which has been widely used in artificial intelligence research and some industries applications. However, it is more difficult in finding out the right representation than the good answers. Constraint Satisfaction is a very power way in representing the problems. Thus, many real life industrial problems could be represented as a kind of Constraint Satisfaction Problem (CSP). Although GA is good in using multiple searchs to find out the "good" solution. However, it effectiveness and the efficiency is based on the randomness and greedy method. The merit of CSP is due to its constraint propagation. That is the solution space is truncated by the posted constraints. However, it is suffering by the poor search strategy. In this research, we proposed a CSP based representation combined with the dual graph and uniform crossover method. In the preliminary study, it is very promising in limiting the search of GA in the partial-feasible solution space than the whole state space. The quality of the solutions could be enhanced and the time in finding them could be decreased effectively as well.
Bi-NaWu y 伍碧那. "A hybrid discretization method for classification algorithms". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/89127564223669943961.
Texto completo國立成功大學
資訊管理研究所
102
Discretization is one of the major approaches for processing continuous attributes for classifiers. Hybrid discretization sets the method for discretizing each continuous attribute individually. A previous study found that hybrid discretization method is a better approach to improve the performance of naïve Bayesian classifier than unified discretization. That approach determines the discretization method for each attribute based on whether accuracy can be improved or not. The objectives of this study is to develop a hybrid discretization method applicable for classifiers such that it can determine the discretization method for each attribute in data preprocessing step instead of using accuracy. This study will first build a network optimization models based on the association among attributes and the class. Dynamic programming is then employed to find the optimal solution for the network, and this solution indicates the discretization method for each continuous attribute. The classification tools for testing our methods are decision trees, naïve Bayesian classifiers, and rule-based classifiers. The experimental results on 20 data sets show that the computational cost of our method is low, and that in general, the hybrid discretization method have a better performance in naïve Bayesian classifiers and rule-based classifiers, but not in decision trees.
Kuo, Wei-Te y 郭偉德. "A Hybrid Method for Image Enlargement Improvement". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/69205073374847457950.
Texto completo淡江大學
資訊工程學系
92
Cubic spline interpolation is a standard method for image enlargement but it also causes edges to be blurred. In this paper we use an Incorporated Gradient Method for computing gradient and the idea that pixels have different processing priority in watershed to improve blurry edges from an enlarged image. In our propose method, similar to the watershed segmentation method, each pixel has a priority according to its gradient and is processed in order by an estimate function K(G) to correct its intensity value. Finally, contrast enhancement on intensity and Gaussian denoising on chromaticity are applied to the image for post processing. Experiments to verify the efficiency of the proposed method and comparison to some existing techniques are also presented.
WU, ZHI-GIANG y 吳志強. "Partial hybrid stress method of laminated plates". Thesis, 1990. http://ndltd.ncl.edu.tw/handle/10392151814052575821.
Texto completo淡江大學
土木工程研究所
78
P.H.S.M.的優點是能解決橫向剪應力於積層板層間介面橫向剪應力不連續的問題,并 能正確地求得剪應力沿厚度方向的分布,尤其當板的厚度逐漸增加時,P.H.S.M.比有 限元素位移法更能模擬板的行為,因此本文將P.H.S.M.與一階層板及兩種高階層板理 論的板元素結合,利用材料性質為直交祑向性的特性,將六個應力分量分割成伸張撓 曲部份及橫向剪力部份,以位移及橫向剪應力為獨立變數,代入Hellinger-Reissner functional中,經變分處理后,得到滿足彈力三大要素及邊界條件,元素自身亦能滿 足應力平衡的要求,故應力場的假設能得到很大的便利。 本文發展的方法,主要是解決橫向剪應力不連續的問題,所得的位移與應力分析結果 亦屬良好,為了驗證此元素的全理性,因此分別探討不同幾何形狀及寬厚比(spanto- thickness ratio),不同加強織維角度與不同層數的復合材料板之行為,以討論本文 新發展之P.H.S.M.其位移分析的收斂性與應力分析之結果,并與三維彈性解和有限元 素位移法所得結果做比較。
Po-AnLin y 林柏安. "A Hybrid Classification Method for Conference Information". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/11565827412416413748.
Texto completo國立成功大學
資訊管理研究所
100
There are many researchers who want to realize the latest research topic and exchange information with others. They will surf the Internet for scholar conference information, and choose some of them to attend. Some websites have provided part of conference information, but most of them cannot help users find the information users really want to explore; besides, it is a hard work to filter the searched conference information by human. Hence, it is an important issue to help reseachers find out the suited conference information from the huge dataset to attend. To find out the suited conference information efficiently for researcher, this study will classify the conference by text mining. The previous references of traditional classification algorithm like Decision Tree, Naïve Bayes Classifier and Support Vector Machine are not designed to classify documents of conference information, so when we classify these academic documents, we may get some incorrect answers. Therefore, the goal of this study is designing a classification algorithm for conference information. Because there are many terminology nouns or phrases which consist of two words in the conference, when we analyze the importance of the terms, we should take this situation into consideration. Moreover, there are pros and cons in different existing classification algorithms, so the hybrid classification is adopted to integrate the traditional algorithm. We expect the new method designing for conference information can help researchers find the suited conferences efficiently and exactly.
"Sensivity analysis with the hybrid boundary element method". Tese, MAXWELL, 1998. http://www.maxwell.lambda.ele.puc-rio.br/cgi-bin/db2www/PRG_0991.D2W/SHOW?Cont=1405:pt&Mat=&Sys=&Nr=&Fun=&CdLinPrg=pt.
Texto completoPicado, de Carvalho Serranho Pedro Miguel. "A Hybrid Method for Inverse Obstacle Scattering Problems". Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-B38F-0.
Texto completo"Kirchho migration using hybrid WENO fast sweeping method". 2015. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1291349.
Texto completoThesis M.Phil. Chinese University of Hong Kong 2015.
Includes bibliographical references (leaves 49-51).
Abstracts also in Chinese.
Title from PDF title page (viewed on 21, September, 2016).
Reuß, Silvia. "A Grid-Adaptive Algebraic Hybrid RANS/LES Method". Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-0028-8717-2.
Texto completoJIANG, CHENG-SHUN y 江承舜. "The conceptual design method of hybrid power system". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/21539674221222640812.
Texto completo國立臺灣大學
機械工程學研究所
96
The purpose of this study is to identify the function and the structure of a hybrid power system clearly, and to search possible conceptual design of hybrid power system efficiently. According to the rules, developed based on graph theory and the characteristics of the system several types of graphs, i.e., structural graph, power flow graph, combined functional graph, can be generated for complete and detailed analysis of the hybrid power system. Then, the possible conceptual design of the hybrid system can be synthesised using this representation through enumeration and selection. The method can be applied to three design topics: 1.Increasing the functions of the system. 2.Muti-structure system synthesis. 3.The synthesis of muti power source system. At last, some case of studies, three design examples, are presented to show the usefulness and effectiveness of the design method.
Chiu, Chih-Cheng y 邱志成. "Research of Production ForecastWith Hybrid Artificial Intelligence Method". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/16101114047160405542.
Texto completo國立高雄第一科技大學
資訊管理所
94
Abstract Enterprises must make proper decisions to face diversified environments. And prediction will play an important role for enterprises. No matter make decisions or plans, there are more or less uncertainties and risks for implementing in the future. So the main purpose of prediction lies in estimating some events or situations in the future in advance and offer administrator the best information that can find out about the uncertain conditions and reduce the risks in the decision-making process. Artificial intelligence methods are gradually paid attention to in recent years. Among them, neural network is extensive and effective one that applies to prediction questions. Because of most prediction questions mainly belong to non-linear model, and neural networks possess to construct non-linear model. So, this research is mainly probed back-propagation neural network assesses the performance of production forecast. Simultaneously, in order to get best prediction result, combine the advantages of Genetic algorithms and Taguchi Methods. The experimental result shows the hybrid artificial intelligence method obviously superior to two kinds of traditional methods that are gray prediction and regression analysis. Therefore we can know the research represents hybrid artificial intelligence method is more accurate than single model or other traditional methods from all assessment indexes. Also, it III can really offer references to the relevant industry that will proceed with production prediction.
Cheng, Yutang y 鄭玉堂. "A Hybrid Method for Frequent Closed Itemsets Mining". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/02249668949985078124.
Texto completo國立清華大學
資訊工程學系
93
Frequent itemset mining is a typical question in the data mining domain. There are many researches about this problem already. We can use frequent closed itemset to find all frequent itemset, and the number of frequent closed itemset is much smaller than frequent itemset. Because of these strong points, frequent closed itemset mining becomes an important topic recently. In former researches, we can separate the approaches by data format into two ways: horizontal format and vertical format. And they can be transformed to each other easily. However, no matter what kind of format we use, we have to check if the answer is "closed". And that is overhead. Our new approach uses both horizontal format and vertical format data at the same time. One characteristics of this approach is that we do not need to check “closed” again. Moreover, in certain special dataset our approach has extremely good performance.
Lee, ChunHao y 李俊豪. "Color Filter Array Interpolation Using a Hybrid Method". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/39585069636785838637.
Texto completo元智大學
資訊工程學系
92
Most digital still cameras capture the natural image using sensors of charge coupled device(CCD) or complementary metal oxide semiconductor (CMOS). The surface of the sensor is usually covered with a color filter array(CFA). In this arrangement, only one color sample is taken for each pixel, and the values of the other colors must be estimated from the neighboring pixels. This process is called the demosaicing process, or the CFA interpolation. In this paper, we propose a new demosaicing method that consists of two steps: an interpolation step that reconstructs to full color by a hybrid method, and a post-processing step that suppresses noticeable demosaicing artifacts by adaptive median filtering. Experimental results will show the proposed method has better perceptual quality as compared to the other published methods.