Tesis sobre el tema "Non-linear dynamic analyses"
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Varun. "A non-linear dynamic macroelement for soil structure interaction analyses of piles in liquefiable sites". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34718.
Texto completoHughes, Jonathan L. "Applications of Stability Analysis to Nonlinear Discrete Dynamical Systems Modeling Interactions". VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3819.
Texto completoKahraman, Ahmet. "Non-linear dynamic analysis of geared systems /". The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487676847117141.
Texto completoLatini, Corazzini Valentina. "Non-linear dynamic analysis of offshore structures". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amslaurea.unibo.it/359/.
Texto completoWilson, Jonathan P. "Non-linear dynamics and power systems". Thesis, University of Bath, 2000. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341136.
Texto completoLe, Thanh Nam. "Non-linear Dynamic analysis of corotational beam structures". Thesis, KTH, Bro- och stålbyggnad, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36799.
Texto completoPatil, Anupkumar. "Non-linear dynamical analysis of biosignals". Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.502349.
Texto completoRichardson, Thomas Stuart. "Continuation methods applied to non linear flight dynamics and control". Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268783.
Texto completoCheng, Gang. "Analyzing and Solving Non-Linear Stochastic Dynamic Models on Non-Periodic Discrete Time Domains". TopSCHOLAR®, 2013. http://digitalcommons.wku.edu/theses/1236.
Texto completoSuliman, Ridhwaan. "A quadratic non-linear elasticity formulation for the dynamic behaviour of fluid-loaded structures". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277824.
Texto completoHuang, Shiling. "Linear stability analysis of non-reacting and reacting elliptical jets". Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-164706/.
Texto completoZangeneh, Kamali Abbas. "Shear Strength of Reinforced Concrete Beams subjected to Blast Loading : Non-linear Dynamic Analysis". Thesis, KTH, Bro- och stålbyggnad, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104241.
Texto completoMäkikallio, T. (Timo). "Analysis of heart rate dynamics by methods derived from nonlinear mathematics:clinical applicability and prognostic significance". Doctoral thesis, University of Oulu, 1998. http://urn.fi/urn:isbn:9514250133.
Texto completoDuan, Chengwu. "Dynamic analysis of dry friction path in a torsional system". Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1092672620.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xxiv, 200 p.; also includes graphics (some col.). Includes bibliographical references (p. 196-200). Available online via OhioLINK's ETD Center
Alam, Md Shafiful. "Iterative Methods to Solve Systems of Nonlinear Algebraic Equations". TopSCHOLAR®, 2018. https://digitalcommons.wku.edu/theses/2305.
Texto completo陶冬玲 y Dong-ling Tao. "Modal parameter identification for non-linear systems using the time-domain fourier filter output method". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31236169.
Texto completoTao, Dong-ling. "Modal parameter identification for non-linear systems using the time-domain fourier filter output method /". Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19013310.
Texto completoCassidy, Mark Jason. "Non-linear analysis of jack-up structures subjected to random waves". Thesis, University of Oxford, 1999. http://ora.ox.ac.uk/objects/uuid:02b96107-638b-4200-9fd7-fa49635594e3.
Texto completoSima, Brum Jose Fernando. "A model for the non linear dynamic analysis of reinforced concrete and masonry framed structures". Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/6173.
Texto completoEl objetivo fundamental de este trabajo es extender la FMG al análisis dinámico no lineal de estructuras espaciales de barras de hormigón armado y obra de fábrica. Para ello, la formulación básica ha sido complementada con varias nuevas características:
· Se ha desarrollado un modelo constitutivo cíclico uniaxial para el hormigón y la obra de fábrica sometida tanto a cargas cíclicas de compresión como de tracción. Se ha puesto especial énfasis en la descripción de la degradación de la rigidez producida durante los ciclos de carga en tracción y compresión, la forma de las curvas de carga y descarga, y la transición entre abertura y cierre de fisuras. Se consideran dos parámetros independientes de daño, una para tracción y otro para compresión. En el caso de cargas cíclicas de compresión, el modelo se derivó de resultados experimentales obtenidos por otros autores, considerando la dependencia de las diferentes variables con el nivel de daño alcanzado, mientras que en el caso de cargas cíclicas de tracción, se propone un modelo simple basado en observaciones experimentales.
· Se adoptó un modelo constitutivo para el acero de refuerzo sometido a cargas cíclicas, el conocido modelo de Menegotto-Pinto.
· Finalmente, se adoptó un procedimiento para la integración de la ecuación de equilibrio dinámico de la estructura.
Una vez implementado en ordenador, el modelo propuesto a sido aplicado a varios casos de estructuras aporticadas de hormigón armado y obra de fábrica sometidas a cargas de tipo cíclico y dinámico. Los resultados obtenidos demuestran que el modelo propuesto permite predecir adecuadamente la respuesta cíclica/dinámica de este tipo estructuras.
The assessment of the dynamic or seismic performance of complex structures often requires the integration in the time domain of the structural equation of motion in the frame of a non-linear analysis. In the case of masonry and reinforced concrete structures, the use of these methods for the assessment of the structure become of great importance, due to its complex non linear behavior, even for low levels of loading. A great number of these structures may be idealized as spatial frames. A generalization of the conventional matrix methods for the analysis of spatial framed structures has been developed in the UPC during the last two decades, the so-called Generalized Matrix Formulation (GMF). The basic formulation for curved elements with variable cross section was presented by Carrascón et al. (1987). Carol and Murcia (1989) extended this flexibility based formulation to the non linear time dependant analysis. This formulation was later extended to the geometrical and material non linear analysis of masonry framed structures (Molins, 1996; Molins and Roca, 1998). An extension of the basic formulation to the linear dynamic analysis was later proposed by Molins et al. (1998) through the introduction of a consistent mass matrix. The formulation has proved for more than fifteen years of extensive use, to be an efficient tool for the analysis of 3D framed structures.
The aim of this research is to extend the GMF to the non linear dynamic analysis of reinforced concrete and masonry framed structures. Following this main goal, the basic formulation has been complemented with a series of new features:
· A uniaxial constitutive model for concrete and masonry subjected to cyclic loadings in both compression and tension has been proposed. Particular emphasis has been paid to the description of the strength and stiffness degradation produced by the load cycling in both, tension and compression, the shape of unloading and reloading curves and the transition between opening and closing of cracks. Two independent damage parameters in compression and in tension have been introduced to model the concrete degradation due to increasing loads. In the case of cyclic compressive loading, the model has been derived from experimental results obtained by other authors by considering the dependency of the cyclic variables with the damage level attained by the concrete. In the case of cyclic tension a simple model is adopted based on experimental observations.
· A constitutive model for the cyclic behavior of reinforcing steel, the well known Menegotto-Pinto model, has been adopted.
· Finally, a time step procedure for the integration of the dynamic equilibrium equation of the structure has been adopted.
In order to show the capabilities of the proposed formulation, once implemented in a computer program, it has been applied in three examples of structures subjected to cyclic and dynamic loadings. The obtained results show that the model may adequately predict the cyclic/dynamic response of this type of structures.
Dunton, Alec. "Topological Data Analysis for Systems of Coupled Oscillators". Scholarship @ Claremont, 2016. http://scholarship.claremont.edu/hmc_theses/79.
Texto completoBlignaut, Caitlyn. "A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone". Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/33433.
Texto completoPHAMAVANH, Kongkeo, 睦. 伊藤, Atsushi ITOH, 光. 中村, Hikaru NAKAMURA, 忠顕 田邉 y Tada-aki TANABE. "RC構造の繰り返し及び動的解析における格子等価連続体化法の適応性". 土木学会, 2004. http://hdl.handle.net/2237/8617.
Texto completoFung, Chi Fung. "On-line dynamical system modelling using radial basis function networks in adaptive non-linear noise cancellation". Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389790.
Texto completoKo, Seung-uk. "Human gait analysis by gait pattern measurement and forward dynamic model combined with non linear feedback control /". Connect to this title online, 2007. http://hdl.handle.net/1957/3754.
Texto completoKRUTZ, JILL E. "DESIGN OF A HYDRAULIC ACTUATOR TEST STAND FOR NON-LINEAR ANALYSIS OF HYDRAULIC ACTUATOR SYSTEM". University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin990813095.
Texto completoThompson, Richard Saint George. "Development of non-linear numerical models appropriate for the analysis of jack-up units". Thesis, University of Oxford, 1996. http://ora.ox.ac.uk/objects/uuid:5804719a-8643-49c3-a9f3-105f35dce9ca.
Texto completoFrazier, William. "Application of Symplectic Integration on a Dynamical System". Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etd/3213.
Texto completoFathala, Giuma Musbah. "Analysis and implementation of radial basis function neural network for controlling non-linear dynamical systems". Thesis, University of Newcastle upon Tyne, 1998. http://hdl.handle.net/10443/3114.
Texto completoVikman, Noa y Gustav Romare. "Models of the Universe : An analysis of the asymptotic behaviour of non-linear dynamical systems". Thesis, KTH, Skolan för teknikvetenskap (SCI), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297891.
Texto completoBouchonneau, Déborah. "Analyse du potentiel de développement des ressources d’hydrocarbure non conventionnelles". Thesis, Montpellier 1, 2011. http://www.theses.fr/2011MON10053/document.
Texto completoInternational energy outlook emphasizes an increasing energy demand over the next decades. Crude oil should represent about 35% of primary energy supply by 2030 according to the IEA. Among supply sources, non conventional crude oil should contribute significantly to the supply of petroleum products, being strategic in terms of reserves and energy independence. This thesis aims to evaluate the development potential of non conventional crude oil using different scenarios regarding the economic and environmental context. Oil sands, essentially located in Canada, constitute our application. The first part of this thesis highlights two development phases: the first one, from 1980 to 2005, corresponding to the emergence of the oil sands sector through regulatory, economic and geographical levers; the second one, started in 2005 with the deterioration of the economic climate, during which oil sands development slowed down significantly. The second part of this thesis focuses on the prospective analysis of the horizon 2050. Firstly, the development of a supply model based on linear programming allowed us to quantify non conventional oil trend supply under deterministic price and environmental regulation scenarios. In particular, investment decision is significantly affected by the establishment of a CO2 tax. Secondly, the development of another supply model based on dynamic programming allowed us to evaluate future non conventional crude oil supply under uncertainties. A negative impact of price uncertainty and volatility on investment decision is highlighted, under or without environmental regulation. This negative impact is strengthened by the introduction of a supplementary uncertainty in environmental legal framework
Sonje, Abhijit Ravindra. "Experimental and finite element investigation into the effects of manufacturing variability on the dynamic response of a bolted interface between a bracket and a thin-walled sheet metal structure". The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546418059243072.
Texto completoTran, Tuan H. "Landing-Gear Impact Response: A Non-linear Finite Element Approach". UNF Digital Commons, 2019. https://digitalcommons.unf.edu/etd/896.
Texto completoOHU, IKECHUKWU POLYCARP NNAMDI. "Analysis of Ergonomics and Highly Non-linear Dynamics of Surgical Motions and Muscle Activations in Minimally Invasive Surgery". OpenSIUC, 2015. https://opensiuc.lib.siu.edu/dissertations/1063.
Texto completoPISANO, FABIO. "Analysis and synthesis techniques of nonlinear dynamical systems with applications to diagnostic of controlled thermonuclear fusion reactors". Doctoral thesis, Università degli Studi di Cagliari, 2013. http://hdl.handle.net/11584/266202.
Texto completoGoodfellow, Marc. "Spatio-temporal modelling and analysis of epileptiform EEG". Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/spatiotemporal-modelling-and-analysis-of-epileptiform-eeg(0f76259a-1a58-44a9-b08b-1402c9b49896).html.
Texto completoYumer, Mehmet Ersin. "On The Non-linear Vibration And Mistuning Identification Of Bladed Disks". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12611498/index.pdf.
Texto completomistuning&rsquo
, which destroys the cyclic symmetry of a rotor, there have been several difficulties related to forced response analysis ever since, two of which are addressed in this thesis: efficient non-linear forced response analysis of mistuned bladed disks and mistuning identification. On the nonlinear analysis side, a new solution approach is proposed studying the combined effect of non-linearity and mistuning, which is relatively recent in this research area and generally conducted with methods whose convergence and accuracy depend highly on the number of degrees of freedom where non-linear elements are attached. The proposed approach predicts nonlinear forced response of mistuned bladed disk assemblies considering any type of nonlinearity. In this thesis, special attention is given to the friction contact modeling of bladed disks which is the most common type of nonlinearity found in bladed disk assemblies. In the modeling of frictional contact a friction element which enables normal load variation and separation of the contact interface in three-dimensional space is utilized. Moreover, the analysis is carried out in modal domain where the differential equations of motions are converted to a set of non-linear algebraic equations using harmonic balance method and modal superposition technique. Thus, the number of non-linear equations to be solved is independent of the number of non-linear elements used. On the mistuning identification side, a new method is enclosed herein which makes use of neural networks to assess unknown mistuning parameters of a given bladed disk assembly from its assembly modes, thus being suitable for integrally bladed disks. The method assumes that a tuned mathematical model of the rotor under consideration is readily available, which is always the case for today&rsquo
s realistic bladed disk assemblies. A data set of selected mode shapes and natural frequencies is created by a number of simulations performed by mistuning the tuned mathematical model randomly. A neural network created by considering the number of modes, is then trained with this data set for being used to identify mistuning of the rotor from measured data. On top of these, a new adaptive algorithm is developed for harmonic balance method, several intentional mistuning patterns are investigated via excessive Monte-Carlo simulations and a new approach to locate, classify and parametrically identify structural non-linearities is introduced.
Corneli, Marco. "Dynamic stochastic block models, clustering and segmentation in dynamic graphs". Thesis, Paris 1, 2017. http://www.theses.fr/2017PA01E012/document.
Texto completoThis thesis focuses on the statistical analysis of dynamic graphs, both defined in discrete or continuous time. We introduce a new extension of the stochastic block model (SBM) for dynamic graphs. The proposed approach, called dSBM, adopts non homogeneous Poisson processes to model the interaction times between pairs of nodes in dynamic graphs, either in discrete or continuous time. The intensity functions of the processes only depend on the node clusters, in a block modelling perspective. Moreover, all the intensity functions share some regularity properties on hidden time intervals that need to be estimated. A recent estimation algorithm for SBM, based on the greedy maximization of an exact criterion (exact ICL) is adopted for inference and model selection in dSBM. Moreover, an exact algorithm for change point detection in time series, the "pruned exact linear time" (PELT) method is extended to deal with dynamic graph data modelled via dSBM. The approach we propose can be used for change point analysis in graph data. Finally, a further extension of dSBM is developed to analyse dynamic net- works with textual edges (like social networks, for instance). In this context, the graph edges are associated with documents exchanged between the corresponding vertices. The textual content of the documents can provide additional information about the dynamic graph topological structure. The new model we propose is called "dynamic stochastic topic block model" (dSTBM).Graphs are mathematical structures very suitable to model interactions between objects or actors of interest. Several real networks such as communication networks, financial transaction networks, mobile telephone networks and social networks (Facebook, Linkedin, etc.) can be modelled via graphs. When observing a network, the time variable comes into play in two different ways: we can study the time dates at which the interactions occur and/or the interaction time spans. This thesis only focuses on the first time dimension and each interaction is assumed to be instantaneous, for simplicity. Hence, the network evolution is given by the interaction time dates only. In this framework, graphs can be used in two different ways to model networks. Discrete time […] Continuous time […]. In this thesis both these perspectives are adopted, alternatively. We consider new unsupervised methods to cluster the vertices of a graph into groups of homogeneous connection profiles. In this manuscript, the node groups are assumed to be time invariant to avoid possible identifiability issues. Moreover, the approaches that we propose aim to detect structural changes in the way the node clusters interact with each other. The building block of this thesis is the stochastic block model (SBM), a probabilistic approach initially used in social sciences. The standard SBM assumes that the nodes of a graph belong to hidden (disjoint) clusters and that the probability of observing an edge between two nodes only depends on their clusters. Since no further assumption is made on the connection probabilities, SBM is a very flexible model able to detect different network topologies (hubs, stars, communities, etc.)
Wolf, Frederik Peter Wilhelm. "Complex networks across fields: from climate variability to online dynamics". Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22907.
Texto completoComplex networks are powerful tools enabling the study of complex systems. In many fields, complex networks are used as a tool to gain an understanding of the dynamics of interacting entities such as neurons in a brain, humans on social media, or global weather systems. At the same time, new theoretical frameworks that extend the toolbox of Network Science promote the application of network tools in new research fields. In this thesis, we aim for both, advancing the theoretical framework of Network Science as well as applying complex networks in Climatology and Computational Social Science.
Lekscha, Jaqueline Stefanie. "Complex systems methods for detecting dynamical anomalies in past climate variability". Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21047.
Texto completoStudying palaeoclimate proxy data from archives such as tree rings, lake sediments, speleothems, and ice cores using windowed recurrence network analysis offers the possibility to characterise dynamical anomalies in past climate variability. This thesis aims at developing a more reliable framework of windowed recurrence network analysis by comparing different phase space reconstruction approaches for non-uniformly sampled noisy data and by tackling the problem of increased numbers of false positive significant points when correlations within the analysis results can not be neglected. For this, different phase space reconstruction approaches are systematically compared and a generalised areawise significance test which implements a numerical estimation of the correlations within the analysis results is introduced. In particular, the test can be used to identify patches of possibly false positive significant points. The developed analysis framework is applied to detect and characterise dynamical anomalies in past climate variability in North and South America by studying four real-world palaeoclimatic time series from different archives. Furthermore, the question whether palaeoclimate proxy time series from different archives are equally well suited for tracking past climate dynamics with windowed recurrence network analysis is approached by using the framework of proxy system modelling. This thesis promotes the use of non-linear methods for analysing palaeoclimate proxy time series, provides a detailed assessment of potentials and limitations of windowed recurrence network analysis and identifies future research directions that can complement the obtained results and conclusions.
May, James E. "Non-Linear Control of Long, Flexible Structures Employing Inter-Modal Energy Transfer [Modal Damping]". University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1247711518.
Texto completoKayikci, Duygu y. "The Behavior of Moment Resisting Steel Frames Under Seismic Excitation with Variation of Geometric Dimensions of Architectural Setbacks". Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_dissertations/583.
Texto completoJagite, George. "Analysis of Slamming Induced Whipping Effects over the Ultimate Strength of Ships". Thesis, Ecole centrale de Nantes, 2020. http://www.theses.fr/2020ECDN0018.
Texto completoThe first part of this thesis is dedicated to the numerical investigations of dynamic ultimate strength for various ship structures. In order to analyze the influence of the inertia and strain rate effects, different load functions are used, starting from the simplest ones where the loads are defined as half-sine functions, to more realistic ones where the loads are induced by equivalent design waves. The dynamic ultimate strength is defined as the maximum load level that leads to a non-collapse scenario, and it is determined through a newly developed iterative algorithm. Finally, the dynamic ultimate strength is compared with the quasi-static ultimate strength, and the dynamic load factors are derived in order to obtain a proper estimator of the dynamic collapse effect. The second part of the thesis is dedicated to the development of a new method to calculate the non-linear whipping response, where the elastoplastic structural response is considered. The hull girder is modeled as two non-uniform beams, connected with a non-linear hinge, described by the non-linear relation between the internal bending moment and the relative rotation angle. The hydrodynamic problem is solved using the 3D boundary element method. Then, the fully coupled hydro-elastoplastic problem is solved within a partly non-linear time-domain seakeeping program. The calculations are perfomed on a broad range of ships on different realistic loading scenarios Finally, the non-linear and linear whipping resposnes are compared in order to derive the dynamic ultimate capacity factors
Araújo, Francisco Adriano de. "Contribuição ao emprego da mecânica do dano para a análise do comportamento dinâmico não-linear de vigas em concreto armado". Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-02052007-093714/.
Texto completoThis work deals with numerical formulation and implementation of a damage model to concrete. The aim is to reproduce hysteresis loops observed experimentally in uniaxial stress-strain diagram when cycles of unloading and reloading are produced. The model proposes that the hysteresis loops are due to the coupling between the dissipation of damage process and the internal friction phenomenon between the faces of crack lips. The phenomenon of internal friction is related to the supposition that the crack doesn\'t open itself by separation mode creating plane lips, but there is a tendency to combine opening and sliding modes across irregular surfaces. The sliding between the crack surfaces generates a sliding strain, which is assumed as responsible by a plastic behaviour with non-linear kinematics hardening. The thermodynamic approach considering damage and internal friction leads to the deduction that the total stress at a point is composted by one component named elasto-damage stress and another named sliding stress, both dependent of the structure damage level. Two basic kinds of simulation are performed: the first one aims to evaluate the influence of the state variables and the material parameters over the stress-strain diagrams. The following simulations are dedicated to the use of the model in dynamic analysis of a reinforced concrete beam subjected to vibration. It is emphasized the effect of the structural damping from hysteresis loops. It is showed that the present damage model generates structural damping that could only be obtained with conventional damage model by using the Rayleigh damping approach in the equation of motion.
Jokinen, V. (Vesa). "Longitudinal changes and prognostic significance of cardiovascular autonomic regulation assessed by heart rate variability and analysis of non-linear heart rate dynamics". Doctoral thesis, University of Oulu, 2003. http://urn.fi/urn:isbn:9514272005.
Texto completoBorra, Chaitanya. "DYNAMICS OF LARGE ARRAY MICRO/NANO RESONATORS". University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1590758736333883.
Texto completoLOPES, ELVIS DINATI CHANTRE. "NON-LINEAR DYNAMICAL ANALYSIS OF COMPOSITE FLOORS CONSIDERING THE EFFECTS OF PARTIAL INTERACTION AND BEAM TO COLUMN AND BEAM TO BEAM CONNECTIONS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=21173@1.
Texto completoCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
O crescimento dos problemas de vibrações excessivas em edificações oriundos de atividades humanas rítmicas tem conduzido à necessidade de desenvolvimento de critérios específicos para projetos estruturais submetidos à ação dessas cargas dinâmicas. Esta foi uma das motivações para o desenvolvimento de uma metodologia de análise para investigação da resposta dinâmica de sistemas estruturais de pisos mistos (aço-concreto). Objetiva-se verificar a influência da interação aço-concreto (interação total e parcial) e, bem como, das ligações estruturais (ligações viga-coluna e viga-viga), sobre a resposta dinâmica não linear de pisos mistos (aço-concreto). Deste modo, são utilizados três modelos de carregamento dinâmico representativos das atividades humanas rítmicas referentes a saltos à vontade e ginástica aeróbica. As cargas dinâmicas são obtidas por meio de testes experimentais e, também, com base em normas e recomendações internacionais de projeto. Com referência a interação aço-concreto, vários tipos de conectores (tipo stud e perfobond) são considerados ao longo da investigação. Mesmo sabendo-se que a análise de vibrações de pisos induzidas por atividades humanas tem sido alvo de inúmeras investigações ao longo dos últimos dois séculos (1828-2012), os autores desconhecem na literatura técnica um trabalho de pesquisa tão abrangente, no que diz respeito à análise dinâmica não linear de pisos mistos (aço-concreto) submetidos à ação de atividades humanas rítmicas, com base na consideração dos efeitos dos conectores (interação aço-concreto) e das ligações (viga-coluna e viga-viga). Diante do exposto, o quadro global investigado neste trabalho de pesquisa demonstra, claramente, um indicativo de que os critérios de projeto devem levar em conta o caráter dinâmico da excitação e, especialmente, a influência da interação aço-concreto e das ligações estruturais, no que tange a verificação dos estados limites de utilização (conforto humano), associados ao comportamento estrutural de pisos mistos de edificações.
The increasing incidence of building vibration problems due to human activities led to a specific design criterion to be addressed in structural design. This was the main motivation for the development of a design methodology centred on the steel-concrete composite floors non-linear dynamic response submitted to loads due to human rhythmic activities. This way, the main objective of this work is to investigate the influence of steel-concrete interaction degree (from total to various levels of partial interaction) and the beam-to-column and beam-to-beam connections effect over the non-linear dynamic behaviour of composite floors. Thus, three dynamic loading models were utilized, in order to simulate human rhythmic activities such as jumping and aerobic gymnastics. The dynamic loads were obtained through experimental tests and based on international design codes and recommendations. Regarding the steel-concrete interaction degree, the stud and perfobond connectors are considered in this investigation. Even though this topic has been studied in the technical literature for nearly two centuries, the steel-concrete composite floors non-linear dynamic analysis submitted to human rhythmic activities has not yet been addressed so comprehensively, as far as the authors are concerned in this investigation, based on the consideration of the connectors (steel-concrete interaction degree) and connections (beam-to-column and beam-to-beam) effects. Considering all aspects mentioned before, the results have demonstrated that the design criteria should include the original nature of the dynamic excitation and, specially, the steel-concrete interaction degree and structural connections effects when the steel-concrete composite floors structural behaviour, related to the serviceability limit states (human comfort) are investigated.
Maestre, Heredia Jorge. "Towards the application of the isogeometric boundary element analysis to fluid mechanics: non-linear gravity waves and dynamics of deformable capsules in shear flows". Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/401587.
Texto completoEn esta tesis se desarrolla un modelo numérico eficiente y robusto para el análisis de problemas fluido-dinámicos, que posteriormente se valida y se aplica a dos nuevas configuraciones: (1) las ondas generadas por un hidroala sumergida y (2) la dinámica de una cápsula deformable en un flujo pulsátil. El modelo se basa en el Método de los Elementos de Contorno (MEC) integrado con la tecnología NURBS and T-spline. Esta técnica es conocida como Análisis Isogeométrico (AIG) y posee ciertas ventajas. La más atractiva es que permite una directa integración entre modernos programas de diseño grafico (CAD) y herramientas de análisis numérico, eliminando así laboriosos pasos intermedios como la generación de la malla. Esta tesis se divide en dos bloques. El primer bloque trata sobre la simulación de propagación la de ondas de gravedad no lineales e la interacción olas-estructuras. El análisis de este fenómeno es útil para predecir la generación y propagación de tsunamis así como es indispensable para el diseño de rompeolas y estructuras flotantes. Se asume que el fluido es inviscido e irrotacional, resultando una ecuación de Laplace que se resuelve mediante el MEC. Se resuelven varios ejemplos en los que se demuestra la precisión y estabilidad temporal del modelo numérico. Adicionalmente se simula el frente de olas generados por una hidroala sumergida. En el Segundo bloque se aplica el AIG al estudio del comportamiento de microcápsulas deformables suspendidas en un flujo. La dinámica de microcápsules deformables conlleva importantes implicaciones en un amplio rango de aplicaciones biomédicas e industriales. El AIG-MEC se usa para resolver la ecuación del fluido mientras que se desarrolla una formulación basada en el AIG-Método de los Elementos Finitos (MEF) para el análisis de la mecánica de la membrana. Se resuelven varios ejemplos en los que se muestra la capacidad del método para la simulación de cápsulas sujetas a grandes deformaciones. Finalmente se estudia la dinámica de una cápsula en un tubo con un flujo pulsátil.
In this Thesis an efficient and robust numerical model for the analysis of fluid dynamic problems has been developed, validated and applied to two novel fluid flow configurations: (1) the waves generated by a submerged foil and (2) the dynamics of microcapsules in pulsating shear flows. The model is based on the Boundary Element Method (BEM) integrated with the NURBS and the T-spline frameworks. This technique is known as Isogeometrical Analysis (IGA) and it offers several advantages. The most attractive is that it allows a direct integration between modern Computer Aid Design geometric systems and numerical engineering analysis tools, removing intermediate steps as the mesh generation. This Thesis is divided into two blocks. The first block deals with the simulation of the propagation of non-linear gravity waves and of the wave-structure interactions. The analysis of this phenomenon is useful to predict the generation and propagation of tsunamis and it is indispensable for the design of breakwaters and floating structures. The flow is assumed to be inviscid and irrotational and the resulting Laplace's equation is solved using BEM. Some benchmark examples are considered to show the temporal accuracy and stability of the method. In addition, the simulation of the waves generated by submerged foils is reported. In the second block the IGA is applied to analyze the behavior of deformable microcapsules in shear flows. The dynamics of deformable capsules have important implications in a wide range of biolomedical and industrial applications. The IGA-BEM is used to solve the Stokes flow equation and an IGA-Finite Element Method (FEM) is developed for the analysis of the capsule mechanics. Some benchmark examples are solved to demonstrate the capability of the present approach for the simulation of capsules subjected to large deformation. Finally, the dynamics of a deformable capsule in a tube under a pulsatile flow is analyzed.
Eslick, John. "A Dynamical Study of the Evolution of Pressure Waves Propagating through a Semi-Infinite Region of Homogeneous Gas Combustion Subject to a Time-Harmonic Signal at the Boundary". ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/1367.
Texto completoGarzeri, Flavio José. "Dinâmica não linear de um pórtico plano sob carregamento não ideal: análise numérica e experimental". Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/3/3144/tde-28032017-080049/.
Texto completoNumerical and experimental analysis of the nonlinear dynamics of a portal frame excited by a non-ideal source - an unbalanced direct current motor - is presented in this thesis as an example of this class of problems. A four degree of freedom model is elaborated: two of them related to the horizontal and vertical structural displacements and two others to the functioning parameters of the motor. A Lagrangian approach for deducing the equations of motion, up to cubic non-linear terms is followed. The numerical solution is obtained through Runge-Kutta algorithm with adaptive step. Static and dynamic tests were performed with the motor and with the complete system, in order to validate the mathematical model. A digital acquisition system recorded all data in computer files, ready to be read by available commercial programs. High speed filming and stroboscopic photography were used to register typical movements related to nonlinear behavior. Numerical and mathematical results show good correlation, as well as present some phenomena related to passage through resonance with limited power excitation such as the Sommerfeld effect. Some other phenomena, related to the nonlinear behavior of the structure are also detected, as modal saturation and energy transference.
Huang, Ming-Hui. "Dynamic characteristics of slender suspension footbridges". Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16450/1/Ming-Hui_Huang_Thesis.pdf.
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