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Autor: Grafiati

Data publikacji: 2 listopada 2024

Data aktualizacji: 31 lipca 2025

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1

Mikula, Léopold. "Contribution à la Modélisation des pertes dans les matériaux magnétiques de dispositifs électromécaniques : Extension vectorielle du Modèle LS et intégration en résolution éléments finis." Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT052.

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Afin de parvenir a augmenter les performances des machines tournantes, les logiciels de conception doivent être affinés pour fournir de meilleurs estimations des pertes générées. L'objectif dans cette étude est donc l'amélioration des modèles de matériaux magnétiques doux en 2D . Des approches dites 'a priori' et 'a posteriori' (Preisach, loss surface) seront évaluées et comparées en s'appuyant sur l'expérimentation et la simulation. Le modèle Loss surface a été vectorisé afin de permettre la prise en des phénomène dit d'hystérésis dynamique en résolution élément finis<br>In order to increase

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2

Conrad, Joël. "Modélisation d'un transformateur de courant à charge variable." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0171.

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Les transformateurs de courant débitent généralement dans une charge de faible impédance. Si cette condition n'est pas remplie, l'induction dans le tore et le courant magnétisant ne sont plus négligeables. Ce mémoire traite ce cas de figure avec en plus des courants éventuellement non sinusordaux et avec une composante contin!le. Un modèle analytique s'étoffe au fur et à mesure afin de tenir compte de ces spécificités. - D'abord nous analysons le comportement de la chaîne de mesure avec des courants sinusoidaux, nous développons un modèle analytique non linéaire de l'impédance magnétisante et

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3

Adedoyin, Ayodeji Adeoye. "Analysis of aftereffect phenomena and noise spectral properties of magnetic hysteretic systems using phenomenological models of hysteresis." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-09212009-165524/.

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Thesis (Ph. D.)--Florida State University, 2009.<br>Advisor: Petru Andrei, Florida State University, College of Engineering, Dept. of Electrical and Computer Engineering. Title and description from dissertation home page (viewed on May 6, 2010). Document formatted into pages; contains xxi, 120 pages. Includes bibliographical references.

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4

Cortial, Fabienne. "Modélisation de l'hystérésis et des dispositifs d'enregistrement magnétique." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0136.

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L'amélioration des têtes pour l'enregistrement magnétique numérique passe par la simulation des procédés d'écriture et de lecture des milieux d'enregistrement. Il apparaît donc indispensable de rechercher un modèle d'hystérésis représentant au mieux le comportement de ces milieux (bandes et disques) : tel est l'objectif de cette thèse. Deux modèles scalaires originaux ont été développés. Ils permettent de représenter analytiquement le cycle majeur en utilisant plus de données expérimentales que les modèles existants et de calculer des cycles mineurs fermés à partir du cycle majeur et des deux

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5

Fuad, Mohammad Naser Mohammad. "On the consistency of hysteresis models." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/353622.

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Hysteresis is a nonlinear behavior encountered in a wide variety of processes including biology, optics, electronics, ferroelectricity, magnetism, mechanics, structures, among other areas. One of the main features of hysteresis processes is the property of consistency formalized in [52]. The class of operators that are considered in [52] consists of the causal ones, with the additional condition that a constant input leads to a constant output. For this class of systems, consistency has been defined formally. This property is useful in system modeling and identification as it limits the search

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6

Phelps, Brian F. "An inclusive model of ferromagnetic hysteresis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0006/NQ42968.pdf.

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7

Joseph, Daniel Scott. "Parameter Identification for the Preisach Model of Hysteresis." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/27295.

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Hysteresis, defined as a rate independent memory effect, is a phenomenon that occurs in many physical systems. The effect is sometimes desired, sometimes a nuisance, sometimes cata- strophic, but in every case we must understand hysteresis if we are to better understand the system itself. This work introduces a method of parameter identification for the Preisach model of hyster- esis. This identification method is explored in both the setting of non-singular measures and the setting of singular measures.<br>Ph. D.

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8

Chevalier, Thierry. "Modélisation et mesure des pertes de fer dans les machines électriques : application à la machine asynchrone." Phd thesis, Grenoble INPG, 1999. http://www.theses.fr/1999INPG0172.

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L'énergie dissipée dans les machines électrique se situe, pour une grande partie, dans les tôles électriques utilisées pour la composition de leur circuit magnétique. Une analyse complète du comportement dynamique des ces tôles est menée, elle met en évidence sa sensibilité à la vitesse de variation de l'induction. Cette analyse conduit, grâce à une séparation des aspects statiques et dynamiques, à la définition d'un modèle d'hystérésis dynamique qui permet une représentation précise des tôles électriques. Le modèle d'hystérésis est ensuite combiné à une méthode d'analyse numérique par élément

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9

Lahey, Timothy. "Modelling Hysteresis in the Bending of Fabrics." Thesis, University of Waterloo, 2002. http://hdl.handle.net/10012/941.

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This thesis presents a model of fabric bending hysteresis. The hysteresis model is designed to reproduce the fabric bending measurements taken by the Kawabata Evaluation System (KES) and the model parameters can be derived directly from these property measurements. The advantage to using this technique is that it provides the ability to simulate a continuum of property curves. Results of the model and its components are compared and constrasted with experimental results for fabrics composed of different weaves and yarn types. An attempt to incorporate the bending model as part of a fab

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10

Foliente, Greg C. "Hysteresis modeling of wood joints and structural systems." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09292009-020259/.

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11

Xie, Xiaoyue S. B. Massachusetts Institute of Technology. "Modified Maxwell Model for hysteresis compensation of piezoelectric stack actuators." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98747.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 29).<br>This thesis presents new observations of the hysteresis behavior of piezoelectric stack actuators and proposes an Input-Range Dependent Maxwell Model for more accurate hysteresis compensation. Experimental studies show that the assumptions of the classical Maxwell model do not fully hold: the actuator behaves differently in the initiation stage compared to the later cycles, and the parameters of the Maxwel

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12

Mohd, Mustafah Anas. "Proposed framework of building nonlinear models : a study using the Bouc-Wen hysteretic model." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15459/.

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Nonlinear models are useful tools in current engineering practice for benefits such as cost savings and improved safety features, especially for testing, designing and maintenance of engineering services. Such models have been widely used for understanding the physics of systems and structures, predictions of abnormalities, predictions of specific scenarios to enable control and for planning of production. Having the correct fit-for-purpose model is very important for the model to be utilised in any of the functions as required, which enables accurate understanding and predictions of the real

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13

Chevalier, Thierry. "Modélisation et mesure des pertes de fer dans les machines électriques : application à la machine asynchrone." Phd thesis, Grenoble INPG, 1999. http://tel.archives-ouvertes.fr/tel-00764023.

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Les conséquences importantes sur l'environnement d'une consommation grandissante d'énergie rendent indispensable une maîtrise du rendement des dispositifs électriques. Il est nécessaire pour améliorer les performances de ces dispositifs de posséder non seulement d'une connaissance fine des phénomènes dissipatifs mais aussi d'outils permettant une simulation- efficace. Parmi tous ces dispositifs, les machines électriques représentent une part très importante. L'énergie dissipée s'y situe, pour une grande partie, dans les tôles électriques utilisées pour la composition de leur circuit magnétique

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14

Schubert, Sven. "Stochastic and temperature-related aspects of the Preisach model of hysteresis." Doctoral thesis, Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-70798.

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Ziel der vorliegenden Arbeit ist es, das Preisach-Modell bezüglich stochastischer äußerer Felder und temperaturbezogener Aspekte zu untersuchen. Das phänomenologische Preisach-Modell wird oft erfolgreich angewendet, um Systeme mit Hysterese zu beschreiben. Im ersten Teil der Arbeit wird die Antwort des Preisach-Modells auf stochastische äußere Felder untersucht. Hier liegt das Augenmerk hauptsächlich auf der Autokorrelation; sie dient dazu den Einfluss des hysteretischen Gedächtnisses zu quantifizieren. Mit analytischen Methoden wird gezeigt, dass sich ein Langzeitgedächtnis, sichtbar in der A

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15

Stakvik, Jon Åge. "Identification, Inversion and Implementaion of the Preisach Hysteresis Model in Nanopositioning." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-25744.

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Atomic force microscopes offer the possibility for imaging a sample topography with accuracy in the nanometer scale. This kind of performance is impossible without actuators enabling a certain accuracy. A frequently used actuator in such nanopositioning applications is the piezoelectric actuator which, although precise, exhibit the unwanted phenomenon of hysteresis. Hysteresis is recognized as the main nonlinearity in the piezoelectric actuator, and introduces severe control issues for accurate positioning.To compensate for hysteresis an accurate model of the nonlinearity has to be identified.

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16

Keane, Michael K. "Hysteresis phenomena of ferromagnetic bodies using the nonlocal exchange energy model." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-171642/.

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17

Meurer, Thomas. "Wave propagation in hysteretic media." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19090.

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18

Hutton, Richard Shane. "Modeling the United States Unemployment Rate with the Preisach Model of Hysteresis." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/32595.

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A system with hysteresis is one that exhibits path dependent but rate independent memory. Hysteresis can be observed physically through the magnetization of a ferromagnetic material. In order to mathematically describe systems with hysteresis, we use the Preisach model. A discussion of the Preisach model is given as well as a method for computing the hysteretic transformation of an input variable. The focus of this paper is hysteresis in economics, namely, unemployment. We consider essential time series techniques for analyzing time series data, i.e. unit root testing for stationarity. H

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19

Wilde, Timothy Philip. "An Energy Based Model for the Compressive Behavior of Goose Down." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4899.

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Very little work has been done to study and understand the internal mechanisms that provide goose down with its resiliency under repeated compression. We have employed low magnification optical microscopy to identify some of these important mechanisms. Microscopy showed that a small tertiary structure exists on most goose down fibers and creates an important point of contact when two fibers interact. This tertiary contact mechanism has been coupled with fiber orientation and incorporated into a unique strain-energy function. The principal stresses for an initial compression cycle can be de

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20

Garcia, Danilo César Cascaldi. "Hysteresis nas exportações manufaturadas brasileiras: um modelo de cointegração com transição suavizada." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/96/96131/tde-05052009-161857/.

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A literatura é extensa no que se refere a estimações de modelos de oferta e demanda para exportações, mas poucos consideram que a resposta em exportações a variações na taxa de câmbio possa ser lenta e assimétrica. Dixit (1989) afirma que a firma que deseja passar a atuar no mercado externo ou deixar tal mercado deve incorrer em custos irrecuperáveis. Além disso, políticas de wait and see fazem com que estas não mudem seu estado (atuantes ou não) imediatamente quando variações significativas na taxa de câmbio acontecem. Tais fatores criam o fenômeno da hysteresis econômica, caracterizado pela

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21

CHINNI, Federico. "Hysteretic magnetic behavior of AuCo nanocomposite systems." Doctoral thesis, Università degli studi di Ferrara, 2018. http://hdl.handle.net/11392/2487888.

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Nowadays, the search for innovative nanocomposite systems consisting of at least two different magnetic phases is attracting remarkable attention. Indeed, the intimate mixing of the different phases at the nano scale level may give rise to new materials showing unique properties. In particular, a fine tuning of their overall magnetic anisotropy may be obtained and, accordingly, of their magnetic hysteretic properties. In this framework, this thesis is dedicated to an in-depth study of the magnetic properties of AuCo nanostructures in form of both continuous films and Nano Holes Array (NHA) sys

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22

Zhang, Bin. "Model for coupled ferroelectric hysteresis using time fractional operators : Application to innovative energy harvesting." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0065/document.

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Les systèmes de récupération d’énergies basées sur les vibrations mécaniques environnantes suscitent l’intérêt depuis de nombreuses années. Augmenter l’efficacité de la conversion d'énergie est primordial, mais celle-ci pour être bien maitrisée, passe par la mise au point de modèles précis et notamment par la prise en compte des lois régissant les matériaux piézoélectriques. En effet, ces matériaux sont à la base des couplages mécano/électriques et il est capital de comprendre comment ils fonctionnent quelque soit l'excitation externe. Un modèle précis du matériau ferroélectrique est indispens

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23

Liu, Min. "A Three-Dimensional Hyper-Viscoelasticity Constitutive Model for the Dynamic Response of Rubber." University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1185546966.

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Richards, Russell Joseph. "Comparison of Linear, Nonlinear, Hysteretic, and Probabilistic MR Damper Models." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/31447.

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Magnetorheolgical (MR) fluid dampers have the capability of changing their effective damping force depending on the current input to the damper. A number of factors in the construction of the damper, as well as the properties of the fluid and the electromagnet, create a dynamic response of the damper that cannot be fully described with a static model dependent on current and velocity. This study will compare different techniques for modeling the force response of the damper in the current-velocity space. To ensure that all the dynamic response characteristics of the damper are captured in

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25

Köthe, Alexandra [Verfasser], and Anna [Akademischer Betreuer] Marciniak-Czochra. "Hysteresis-driven pattern formation in Reaction-diffusion-Ode models / Alexandra Köthe ; Betreuer: Anna Marciniak-Czochra." Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177809214/34.

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MEHRPARVAR, MAHSHID. "Control Systems for Experimental Magnetic Materials Characterization Using Dynamic Preisach Models." Thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160704.

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The eciency of electrical machines is of major concern due to their widespread usage and the globally increasing awareness of energy consumption issues. Iron losses have a signicant impact on the total and thus researchers and manufacturers of electrical machines are developing dierent strategies in order to reduce them. The iron losses are highly dependent on the magnetic material that is used and thus it is necessary to identify its relevant characteristics. In this work, the development of a control system for inducing a pure sinusoidal magnetic ux density in the magnetic material is descri

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27

Dehghannayyeri, Atefeh. "Developing a Fluid Flow Model for Mobile Video Transmission in the Presence of Play-Out Hysteresis." Thesis, Blekinge Tekniska Högskola, Institutionen för kommunikationssystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13510.

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This work focuses on improving video transmission quality over a mobile link. More specifically, the impact of buffering and link outages on the freeze probability of transmitted videos is studied. It introduces a new fluid flow model that provides an approximation of the freeze probability in the presence of play-out hysteresis. The proposed model is used to study the impact of two streaming buffer sizes over different possible combinations of outage parameters (data channel on/off times). The outcome of this thesis shows that outage parameters play a dominant role in freezing of streaming vi

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Oduro, Bismark. "Mathematical Models of Triatomine (Re)infestation." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1458563770.

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Sheta, Hussam. "Simulation von Mehrphasenvorgängen in porösen Medien unter Einbeziehung von Hysterese-Effekten." [S.l. : s.n.], 1999. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB12168134.

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Perry, Logan Andrew. "Sensitivity Study on Modification of Vertical Distribution of Strength and Stiffness in Wood Shear Wall Building Models." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/96023.

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This thesis presents a numerical study of the influence of varying story strength on the seismic performance of multi-story wood-frame shear wall buildings. In the prior FEMA P695 studies of these buildings, the non-simulated collapse limit-state was exceeded primarily in the first story. This observation raised interest in quantifying the influence of varying strength from story to story on seismic response. In this study, four distributions of strength are used as bounding cases. The Parabolic strength distribution (1) results from the ELF vertical force distribution method in ASCE 7 tha

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31

Lauerer, Alexander, Philipp Zeigermann, Jörg Lenzner, Christian Chmelik, Rustem Valiullin, and Jörg Kärger. "IR Micro-imaging of mesoporous silicon as a model system for the investigation of hysteresis phenomena." Diffusion fundamentals 20 (2013) 93, S. 1-2, 2013. https://ul.qucosa.de/id/qucosa%3A13682.

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Lauerer, Alexander, Philipp Zeigermann, Jörg Lenzner, Christian Chmelik, Rustem Valiullin, and Jörg Kärger. "IR Micro-imaging of mesoporous silicon as a model system for the investigation of hysteresis phenomena." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183825.

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Heine, Christian P. "Simulated Response of Degrading Hysteretic Joints With Slack Behavior." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28576.

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A novel, general, numerical model is described that is capable of predicting the load-displacement relationship up to and at failure of multiple-bolt joints in timber of various configurations. The model is not tied to a single input function and bolt holes are permitted to be drilled oversize resulting in a slack system. The model consists of five parts. A new mathematical hysteresis model describes the stiffness of the individual bolt at each time step increment and accounts for non-linear and slack behavior; a mechanically-based structural stiffness model explains the interaction of one

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34

Ribbenfjärd, David. "A lumped element transformer model including core losses and winding impedances." Licentiate thesis, KTH, School of Electrical Engineering (EES), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4307.

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<p>In order to design a power transformer it is important to understand its internal electromagnetic behaviour. That can be obtained by measurements on physical transformers, analytical expressions and computer simulations. One benefit with simulations is that the transformer can be studied before it is built physically and that the consequences of changing dimensions and parameters easily can be tested.</p><p>In this thesis a time-domain transformer model is presented. The model includes core losses as magnetic static hysteresis, eddy current and excess eddy current losses. Moreover, the mode

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35

Dean, Michael C. "The Effect of Implementing a Boundary Element Cohesive Zone Model with Unloading-Reloading Hysteresis on Bulk Material Response." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397664062.

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Kozina, Thomas. "Using the mean field model to analyze the influence of texture on the hysteresis behaviour of silicon steels." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59284.

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A critical study of the Jiles and Atherton Mean Field Model was done to determine the validity of the model, a tool in describing and understanding the magnetization process in textured silicon steels.<br>Hysteresis loops were generated using an Epstein apparatus in various directions with respect to the rolling direction and for various external magnetic fields. Techniques were then used to obtain the model parameters, namely a$ sp prime,$ $ alpha sp prime,$ and k$ sp prime.$ After creating a new version of the model, M$ sb{ rm s}$ was also obtained from the data hysteresis loops.<br>The mode

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37

Six, Lancelot. "Vers un modèle de comportements de véhicules lourds en utilisant une méthode incrémentale basée sur la vérification et l'hystérésis : le modèle ArchiPL." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066497/document.

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Les phénomènes de congestion sont dangereux, et couteux économiquement. La compréhension de ces phénomènes est un sujet majeur ayant occupé la communauté scientifique depuis la moitié du vingtième siècle. L'approche microscopique, cherchant à reproduire les phénomènes macroscopiques grâce à la modélisation des comportements individuels, a proposé un grand nombre de modèles. Cependant, alors que la littérature a mis en avant l'impact négatif des véhicules lourds, peu se sont intéressés à savoir si les véhicules lourds ont un comportement similaire à celui des véhicules légers. Les principaux mo

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Schönborg, Niclas. "Development of loss models for a high-temperature superconducting tape." Doctoral thesis, KTH, Electrical Systems, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3268.

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<p>In the recent years significant progresses in thedevelopment of high-temperature superconductors have been made.It is realistic to believe that power applications, based onthese conductors, in a few years will become available. To beable to utilise the conductors in an optimum way, theunderstanding of their behaviour under application-likecondition is essential. One important parameter that has to beoptimised is the power loss, which means that mathematicalmodels of these losses have to be developed. In a typicalapplication the superconductor is utilised in a coilconfiguration where the act

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Chiruta, Daniel-Gabriel. "The analysis of hysteretic behavior in bistable spin transition nanomaterials and its applications towards nanoelectronics devices." Versailles-St Quentin en Yvelines, 2014. http://www.theses.fr/2014VERS0020.

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L’objectif principal de ce travail est d’appliquer des méthodes exactes (matrice de transfert) ou semi-exactes (en utilisant des simulations Monte Carlo avec l’algorithme de l’échantillonnage entropique) à l’étude du comportement des matériaux moléculaires. Nous avons utilisé le modèle type-Ising en tenant compte des interactions à courte et à longue portée afin de simuler la réponse à des effets extérieurs dans des composés à transition de spin de taille macroscopique ainsi que des tailles nanométriques. Grâce à leur bistabilité ces composés à transition de spin sont potentiellement utilisabl

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Ribbenfjärd, David. "Electromagnetic transformer modelling including the ferromagnetic core." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-13080.

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In order to design a power transformer it is important to understand its internal electromagnetic behaviour. That can be obtained by measurements on physical transformers, analytical expressions and computer simulations. One benefit with simulations is that the transformer can be studied before it is built physically and that the consequences of changing dimensions and parameters easily can be assessed. In this thesis a time-domain transformer model is presented. The model includes core phenomena as magnetic static hysteresis, eddy current and excess losses. Moreover, the model comprises windi

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Six, Lancelot. "Vers un modèle de comportements de véhicules lourds en utilisant une méthode incrémentale basée sur la vérification et l'hystérésis : le modèle ArchiPL." Electronic Thesis or Diss., Paris 6, 2014. http://www.theses.fr/2014PA066497.

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Les phénomènes de congestion sont dangereux, et couteux économiquement. La compréhension de ces phénomènes est un sujet majeur ayant occupé la communauté scientifique depuis la moitié du vingtième siècle. L'approche microscopique, cherchant à reproduire les phénomènes macroscopiques grâce à la modélisation des comportements individuels, a proposé un grand nombre de modèles. Cependant, alors que la littérature a mis en avant l'impact négatif des véhicules lourds, peu se sont intéressés à savoir si les véhicules lourds ont un comportement similaire à celui des véhicules légers. Les principaux mo

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Wolf, Felix [Verfasser]. "Generalisiertes Preisach-Modell für die Simulation und Kompensation der Hysterese piezokeramischer Aktoren / Felix Wolf." München : Verlag Dr. Hut, 2014. http://d-nb.info/1063221862/34.

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Araújo, Francisco Adriano de. "Formulação de um modelo de dissipação concentrada para a análise não-linear de estruturas reticuladas planas em concreto armado." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-18102007-105937/.

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O trabalho trata da formulação, implementação e aplicação de um modelo para análise não-linear de estruturas reticuladas planas em concreto armado, baseado no conceito simplificado de localização dos processos físicos irreversíveis (dano, plasticidade e histerese) em zonas previamente definidas denominadas rótulas que se localizam nas extremidades de um elemento finito de barra. O modelo proposto tem por objetivo reproduzir os deslocamentos residuais relacionados tanto ao comportamento plástico do concreto danificado quanto ao escoamento do aço, além de possibilitar a reprodução de laços de hi

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Calik, Ertugrul Emre. "Development Of A Physical Theory Model For The Simulation Of Hysteretic Behavior Of Steel Braces." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608328/index.pdf.

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Bracing members are considered to be effective earthquake-resistant elements as they improve the lateral strength and stiffness of the structural system and contribute to seismic energy dissipation by deforming inelastically during severe earthquake motions. However, the cyclic behavior of such bracing members is quite complex because it is influenced by both buckling and yielding. This thesis presents simple but an efficient analytical model that can be used to simulate the inelastic cyclic behavior of steel braces. This model achieves realism and efficiency by combining analytical formulati

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Roy, Su-Kim Delores. "Development and incorporation of a NAPL residual into the Lenhard-Parker pressure-saturation hysteretic model." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0004/MQ43347.pdf.

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Vaidya, Anirudha. "Load-Displacement Relations for an Edge-Cracked Beam with a Hysteretic Bilinear Cohesive Zone Model." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408958644.

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Roy, Sue-Kim Delores Carleton University Dissertation Engineering Civil and Environmental. "Development and incorporation of a NAPL residual into the Lenhard- Parker pressure-saturation hysteretic model." Ottawa, 1999.

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Cornejo, Daniel Reinaldo. "Aplicação do Modelo de Preisach em Ímãs Nanocristalinos." Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/43/43133/tde-30082012-153600/.

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Estudamos propriedades magnéticas de ligas nano cristalinas de Sm-F e-Co. As ligas foram preparadas por mecano-síntese e posterior tratamento térmico. Como resultado, obtivemos ímãs nanocristalinos de Sm18 (Fe,Co)82 , com Sm(Fe,Co)7 como fase principal. As ligas apresentaram excelentes propriedades magnéticas: remanências relativas Mn/ Ms ~ 0.6 e coercividades na faixa 5-20 kOe, dependendo do teor de Fe nos materiais. Interações magnéticas nas ligas foram estudadas com base nos gráficos ele Henkel. Interpretamos, nestes gráficos, de maneira consistente a influência elas interações e dos estado

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Vadakkeveetil, Sunish. "Analytical Modeling for Sliding Friction of Rubber-Road Contact." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/79596.

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Rubber friction is an important aspect to tire engineers, material developers and pavement engineers because of its importance in the estimation of forces generated at the contact, which further helps in optimizing tire and vehicle performances, and to estimate tire wear. It mainly depends on the material properties, contact mechanics and operating condition. There are two major contributions to rubber friction, due to repeated viscoelastic deformation from undulations of surface called hysteresis and due to Vander Waals interaction of the molecules called adhesion. The study focuses on analyt

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Niemoczynski, Bogdan. "Nonlinear Control of Magnetic Signatures." Master's thesis, Temple University Libraries, 2015. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/360321.

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Electrical Engineering<br>M.S.E.E.<br>Magnetic properties of ferrite structures are known to cause fluctuations in Earth's magnetic field around the object. These fluctuations are known as the object's magnetic signature and are unique based on the object's geometry and material. It is a common practice to neutralize magnetic signatures periodically after certain time intervals, however there is a growing interest to develop real time degaussing systems for various applications. Development of real time degaussing system is a challenging problem because of magnetic hysteresis and difficulties

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