Dissertations / Theses on the topic 'Electromagnetic-Based modeling'
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Minteer, Timothy Michael. "Electromagnetic modeling based on directional time-distance energy transfer analogies." Thesis, Washington State University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3587146.
Full textA new electromagnetic model is established based on an average rate of directional time-distance energy transfers. A directional time-distance energy transfer is defined as an energy carrier mediator (boson) exchange. Electromagnetic force is modeled as mean valued, continual emission and absorption of energy carrier mediators.
For an isolated, spherically symmetric static charge distribution, Maxwell's stress equation is recast using a variant of Stokes' Theorem. The recast stress equation eliminates the stress normal to the electric field and establishes a stress only aligned with the electric field. The remaining stress is identified as an external omnidirectional Poincaré stress, inwardly directed towards the charge distribution. The Poincaré stress is modeled as a mean valued, continual exchange of bosons between the charge distribution and the distant matter of the universe.
For two separated, spherically symmetric static charge distributions, Maxwell's stress equation is recast using a variant of Stokes' Theorem. The recast stress equation develops a line stress that only exists on the straight path between the two charge distributions. The line stress is identified as a Coulomb stress modeled as a mean valued, continual exchange of photons back and forth between two like-charge distributions.
For an isolated, differential current element, Maxwell's stress equation is recast using a variant of Stokes' Theorem. The recast stress equation establishes a pinch stress that is normal to the magnetic field and is directed inward toward the differential current element. Similar to the Poincaré stress, the pinch stress is omnidirectional and is modeled as a mean valued, continual exchange of bosons between the current element and the distant matter of the universe.
For two separated, static differential current elements, a Neumann stress is established by analyzing the historical current force formulas known to be compatible with Maxwell's equations for closed circuits. The term Neumann stress is assigned to the line stress that only exists at each point on the straight path between two separated, differential current elements. Similar to the Coulomb stress, the Neumann stress is modeled as a mean valued, continual exchange of photons back and forth between two differential current elements in opposite directions.
Chien, Wei-Yin. "Electromagnetic modeling and experimental evaluation of plasmon-based molecular sensors." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21949.
Full textL'avancée des nanosciences et de la nanotechnologie au cours des dernières décennies a suscité un renouvellement de l'intérêt pour les propriétés optiques des métaux. Aujourd'hui, la Plasmonique cherche à contrôler les champs proches électromagnétiques des nanostructures métalliques afin de bénéficier des nouvelles applications reposant sur l'optique de sous-longueur d'onde. En particulier, ce mémoire explore l'utilisation de la résonance à plasmons pour la capture des molécules. L'étude se divise en la résonance à plasmons de surface (SPR) pour des surfaces métalliques planes et pour des nanosphères métalliques. Ces deux méthodes permettent de créer des capteurs sensibles aux variations d'indice de réfraction et d'autres qui reposent sur des effets non-linéaires tels que la diffusion Raman exaltée de surface (SERS). Suite à l'introduction des bases, l'opération ainsi que des résultats expérimentaux de deux capteurs à plasmons de surface sont présentés. Un capteur intégré et une version 2D avec modulation de longueur d'onde et de l'angle possèdent une sensibilité angulaire d'environ 126°/RIU et 91°/RIU, respectivement. Par la suite, la réalisation de la méthode du multiple-multipole, utile pour évaluer l'efficacité de la concentration des champs entre des nanosphères métalliques, est discutée. Une amélioration de la concentration de champ optique de l'ordre de 450 par des nanospheres d'or est présentée. Mots-clés: plasmon de surface, plasmonique, biocapteurs optiques, diffusion Raman exaltée de surface, optique des métaux, nanophotonique, nanomatériel, électro-dynamique classique
Spinelli, Giovanni. "Electromagnetic characterization and modeling of CNT-based composites for industrial applications." Doctoral thesis, Universita degli studi di Salerno, 2012. http://hdl.handle.net/10556/343.
Full textIn several applications for the aeronautic, automative and electronic industries, there is an increasing demand of structural nanocomposites exhibiting remarkable thermal and mechanical properties and, at the same time, tailored and controlled electromagnetic (EM) performances. The interest and the scientific importance of the topic is justified by the fact that the conventional materials do not have the suitable properties to satisfy the specific requirements for modern applications. Instead, two or more distinct materials may be combined to form a material which possesses superior properties, with respect to those of individual components. Thus the individuation and preparation of advanced composites with best features respect to the traditional materials is currently required in several industrial sectors. Since CNTs can be exploited with varying structural and physical properties, geometry and functionality, that result in a different dispersion and adhesion with the polymer matrix, the possible range of composite material properties can be very large... [edited by author]
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Barzegaran, Mohammadreza. "Physics-Based Modeling of Power System Components for the Evaluation of Low-Frequency Radiated Electromagnetic Fields." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1239.
Full textLim, Jung Youl. "A distributed multi-level current modeling method for design analysis and optimization of permanent magnet electromechanical actuators." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53990.
Full textDU, ZIWEIHUA. "Time-domain Analysis of Multiconductor Transmission Lines Excited by Transient Electromagnetic Disturbances Based on the Analog Behavior Modeling." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2842495.
Full textNejadpak, Arash. "Development of Physics-based Models and Design Optimization of Power Electronic Conversion Systems." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/824.
Full textDanufane, Fadil. "Wireless communications assisted by reconfigurable intelligent surfaces : an electromagnetic model." Electronic Thesis or Diss., université Paris-Saclay, 2021. http://www.theses.fr/2021UPASG038.
Full textThe emergence of smart radio environment (SRE) as a new paradigm that challenges the status quo in wireless communication has motivated the use of metasurface-based reconfigurable intelligent surface (RIS) to improve the performance limits in wireless communication systems. The main focus of this thesis is the modeling of reconfigurable intelligent surfaces (RIS)-aided communication systems using electromagnetic based methods.Chapter 1 introduces the concept of smart radio environment. We also give the definition of RIS and how RIS can be used in context of SRE. To give some historical perspectives, we also discuss several important milestone papers throughout the development of research activities that lead to the current state of the art.Chapter 2 introduces theoretical concepts that are necessary to understand the results in the subsequent chapters. This chapter is divided into two parts. The first part discusses the metasurfaces modeling where we move from a physics-based microscopic description of a metasurface and introduces a macroscopic representation for it, which is shown to be suitable for application in wireless communications. The second part introduces several analytical approaches that allow us to compute the EM field at any point of a given volume that contains the metasurface.Chapter 3 provides a performance comparison between RISs operating as anomalous reflectors and a decode-and-forward relaying scheme that is representative of competing candidate technologies to realize SREs. The comparison is qualitative and covers multitude metrics. Furthermore, a quantitative comparison in terms of achievable data rates is presented. In particular, the numerical results show that sufficiently large RISs can outperform relay-aided systems in terms of data rate, while reducing the implementation complexity.Chapter 4 proposes an electromagnetic-based analytical characterization of the free-space path-loss of a wireless link in the presence of a RIS that is modeled as a two-dimensional homogenized metasurface made of sub-wavelength scattering elements and that operate either in reflection or transmission mode. The analytical method of physical optics is employed. Closed-form expressions are also obtained in two asymptotic regimes that are representative of far-field and near-field deployments. Based on the proposed approach, the impact of several design parameters and operating regimes is unveiled.Finally, Chapter 5 summarizes the main findings of the thesis and discusses possible future directions that are worth investigating to unlock the full potential of RIS and bring it into practice
Argyropoulos, Christos. "FDTD modelling of electromagnetic transformation based devices." Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/367.
Full textKharrat, Mouna. "Contribution au choix d'architecture 3D des systèmes mécatroniques sous contraintes multi-physiques : Application aux Interférences Electro-Magnétiques (IEM)." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST049.
Full textThe integration of mechatronic systems generates many multi-physical disturbances (thermal, electromagnetic and dynamic) making their choice of architecture complex. Indeed, the increasing introduction of electronic and electrical (E/E) components in most of the current systems, increases the risk of occurrence of many electromagnetic interferences (EMI) that can strongly degrade their behavior. While these electromagnetic compatibility (EMC) problems are usually addressed in the detailed design phase, where the possibilities of compromise are limited to a few positioning adjustments or costly protection solutions, one solution is to propose a collaborative framework for the evaluation, from the early design phases, of physical design architectures taking into account these electromagnetic (EM) constraints. Actually, it is important at this stage that all the multidisciplinary actors involved can define, modify/update, add their knowledge and constraints and exchange their data while continuing to work in their usual digital environment. In addition, these system engineering activities must be supported with "Model-Based System Engineering" (MBSE) approaches, to support the digital continuity, consistency and traceability of the models and data required for this evaluation process.To meet this need, this thesis is based on the MBSE SAMOS (Spatial Architecture based on Multi-physics and Organization of Systems) collaborative approach to support, from the preliminary design phase, the evaluation of the 3D concept architecture under electromagnetic constraints. In this context, we have initially developed a SysML extension called EMILE (ElectroMagnetic Interactions Layout Extension) to formalize and model, as early as possible, the EM constraints in the system model.This extension notably includes the definition of EM requirements, the description of electromagnetic coupling modes and the specification of simulation configurations allowing the further verification and validation of the requirements, thanks to the development of a Human-Machine Interface. Our research work then focused on an evaluation methodology combining a topological approach with EM modeling, in order to support the process of qualitative and quantitative evaluation of electromagnetic interference (EMI). Indeed, for a given type of EMI, the topological analysis of the system architecture allows to qualitatively identify the existence of the victim components and their associated potential aggressors. Once these potential EMIs have been identified, a quantitative evaluation can then be performed, for example based on the physical equations and laws of the identified coupling, and on the electromagnetic and geometric requirements predefined with the EMILE extension. As a result, this approach ensures the relevant choice of a 3D physical architecture of the concept under EM constraints. The proposed approaches have been illustrated on a case study of an electric vehicle power train, based on various software implementation scenarios (SysML, Modelica, Matlab, FreeCAD) within the Sketcher 3D EM tool
Hátsági, Bence. "Electromagnetic modellin and testing of a Thomson coil based actuator." Thesis, KTH, Elkraftteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209200.
Full textMålsättningen för denna uppsats är att förbättra och optimera en aktuator för mellanspänningsvakuumbrytare baserad på en Thomsonspole. Aktuatorkonceptet analyserasoch diskuteras. Uppsatsen presenterar analytiska modeller såväl som numeriska modellerför FEM av aktuatorn, samt jämförelser av resultaten från simuleringar gjorda av dessa.Flera experimentuppställningar har byggts under detta examensprojekt och beskrivs idenna uppsatsen. Mätningar från dessa uppställningar jämförs också med resultaten frånsimuleringarna. Uppsatsen drar slutligen slutsatser utifrån resultaten och föreslår möjligavägar för ytterligare arbete på området inom en snar framtid.
Barrie, Kate. "FDTD electromagnetic modelling of cavity-based weighting functions for microwave radiometric temperature measurement." Thesis, University of Glasgow, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399668.
Full textYilmaz, Asim Egemen. "Finite Element Modeling Of Electromagnetic Scattering Problems Via Hexahedral Edge Elements." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608587/index.pdf.
Full textBradai, Sonia. "Design and Modelling of a Novel Hybrid Vibration Converter based on Electromagnetic and Magnetoelectric Principles." Universitätsverlag Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A32787.
Full textDie Versorgung von drahtlosen Sensoren aus der Umgebungsenergie ermöglicht heutzutage eine hohe Einsatzflexibilität und die Senkung des Systemwartungsaufwands. Schwingungsquellen sind aufgrund ihrer Verfügbarkeit und der damit erreichbaren Energiedichte besonders attraktiv. Ziel dieser Arbeit ist es, einen hybriden Energiewandler für Vibrationsquellen mit geringer Amplitude und niedriger Frequenz zu realisieren. Der Ansatz dabei ist, zwei verschiedene Wandler zu kombinieren, um eine höhere Energiedichte zu erreichen und die Zuverlässigkeit zu verbessern. Der Entwurf konzentriert sich auf die Modellierung und den Test des hybriden Vibrationswandlers. Für einen geeigneten Wandlerentwurf werden die Schwingungsprofileigenschaften mehrerer Umgebungsschwingungsquellen untersucht. Die Ergebnisse zeigen, dass die typische Frequenz zwischen 5 Hz und 60 Hz und der Beschleunigungsbereich zwischen 0,1 g und 1,5 g liegen. Der vorgeschlagene Wandler kombiniert das magnetoelektrischen (ME) Prinzip mit dem elektromagnetischen (EM) Prinzip. Diese beiden Prinzipien können innerhalb des fast gleichen Volumens leicht integriert werden, da sie Energie aus der Variation des gleichen Magnetfeldes, das mit der mechanischen Schwingung gekoppelt ist, erzeugen können. Dadurch wird die Energiedichte verbessert, da der ME-Wandler in das relativ große Spulengehäuse des elektromagnetischen Wandlers eingesetzt werden kann. Darüber hinaus basiert der vorgeschlagene Wandler auf der Verwendung von Magnetfedern, um die Repulsivkraft auf die seismische Masse zu realisieren. Aufgrund der Nichtlinearität der Magnetfeder, kann der Wandler in einem breiteren Frequenzbereich betrieben werden, anstatt nur bei der Resonanzfrequenz, wie es bei der Verwendung einer mechanischen Feder der Fall ist. Dies führt dazu, dass der Wandler auch bei zufälligen breitbandigen Schwingungsquellen effizient betrieben werden kann. Darüber hinaus ermöglicht die Verwendung des Magnetfederprinzips eine einfache Einstellung der Resonanzfrequenz des Wandlers in Bezug auf die Schwingungsquelle, durch Einstellen der Größe des beweglichen Magneten. Für den Wandlerentwurf wird eine Parameterstudie mit Hilfe der Finite-Elemente-Analyse durchgeführt. Zwei Hauptkriterien werden dabei berücksichtigt: Die Kompaktheit und die Energieeffizienz des Wandlers. Parameter die diese beiden Kriterien beeinflussen, können in mechanische, elektromagnetische und magnetoelektrische unterteilt werden. Die Ergebnisse haben gezeigt, dass die Kombination der EM- und ME-Prinzipien zu einer Verbesserung der Energieausbeute im Vergleich zu einem einzelnen EM- oder ME-Wandler geführt hat. Der neuartige Hybrid-Wandler wurde realisiert und unter harmonischen und realen Schwingungsprofilen getestet. Der Wandler besteht aus zwei Hauptteilen: Ein festes Teil, an dem die Spulen und der ME-Wandler befestigt sind, um eine hohe Zuverlässigkeit zu gewährleisten indem auf einen beweglichen Draht verzichtet wird, und ein bewegliches Teil, das sich aus einem beweglichen Magneten zusammensetzt. Der vorgestellte Wandler ist zuverlässig, kompakt und in der Lage, Energie mit einer maximalen Ausgangsleistungsdichte von 0,11 mW/cm 3 und einer Bandbreite von 12 Hz bei einer Resonanzfrequenz von 24 Hz unter einer angelegten harmonischen Schwingung mit einer Amplitude von 1 mm zu gewinnen.
Armanious, Adel Fahmy. "Computation of radio frequency electromagnetic fields using the method of moments : an investigation of approaches to the development of electromagnetic field software based on the method of moments, including ...........and computer-aided design techniqu." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235544.
Full textCoulibaly, Lacina M. "Crosstalk-based analytical modelling of electromagnetic signatures for non-invasive testing of VLSI circuits and systems." Thesis, Liverpool John Moores University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438850.
Full textNatarajan, Aswani. "Electromagnetic modelling of graphene-based nanophotonic devices : modal and scattering approaches using the finite element method." Thesis, Aix-Marseille, 2021. http://www.theses.fr/2021AIXM0472.
Full textPlasmonics based on 2D materials is a burgeoning field in photonics with potential groundbreaking technological implications for diagnostics, energy and data communication. Graphene, a unique 2D material with excellent plasmonic properties is a promising alternative to conventional noble metals in plasmonics notably due to its tunable properties. Graphene is modelled in this thesis as an infinitesimally thin current-carrying sheet in a fully vectorial finite element Galerkin framework as opposed to more conventional models where graphene is considered to be of finite thickness. A rigorous study of the behaviour of the electromagnetic field along the propagation direction in an openridge waveguide is carried out by modelling graphene as a 1D conductive scatterer which acts as a local perturbation. The scattering model is verified through a full energy balance in different geometries. The large momentum mismatch that exists between the waveguide mode and the graphene plasmon mode in a graphene-based waveguide severely alters the coupling between these two modes. To overcome this, a coupler is designed using the developed scattering field formalism. Elaborate studies of the beating phenomenon observed in the coupler are performed. The designed waveguide coupler is apt for graphene of lengths equal to or shorter than the order of the wavelength. Several studies involving the various diffraction orders of the grating coupler, waveguide thickness, etc. are conducted. The parameters of the coupler are then optimized to yield a compact and integrated graphene-based grating coupler of efficiency as high as 80% in the infrared region
Gabdullin, N. "Modelling and design of high-speed, long-lifetime and large-force electromagnetic actuators based on magnetic shape memory alloys." Thesis, City, University of London, 2016. http://openaccess.city.ac.uk/16130/.
Full textHertz, Erik M. "Thermal and EMI Modeling and Analysis of a Boost PFC Circuit Designed Using a Genetic-based Optimization Algorithm." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34234.
Full textMaster of Science
Medhat, Abdel Maksoud Dina. "Study of New Miniaturized Microwave Devices based on Ratchet Effect in an Environment of Asymmetric Nano-Scatterers." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0075/document.
Full textNanotechnology is a growing field that has attracted significant research attention due to its unlimited potential applications. Millimeter wave technology is another interesting field that plays a leading role in the development of wireless communications systems. Combining these two advanced research fields together, has given rise to the innovation of the Ratchet Device which is now a new challenging application. This device has a nanoscale size and its concept of operation consists of generating a DC voltage when radiating a two-dimensional electron gas based device with microwave energy. The aim of this thesis is in trying to improve the device response and hence opening new perspectives in the fabrication of high frequency field detectors on the nanoscale level. Unfortunately, the current Ratchet Devices, based on semiconductor heterostructures, realized till now, operate at low temperatures to ensure high electron mobility. This condition necessitates the use of a complex experimental setup that has a great impact on the induced voltage and on the reproducibility of the observed Ratchet phenomenon. In this context, the work performed within the framework of this thesis has addressed this problem in two parts. The first part concerns the electromagnetic analysis of the experimental setup behavior. This has been achieved by implementing intensive full wave electromagnetic simulations. Different solutions have been proposed to optimize the setup and thus enhance the Ratchet voltage produced. In addition to the electromagnetic study, some modulation measurements have been performed to test the feasibility of the Ratchet Device as an amplitude demodulator. The second part of this thesis deals with the study of the material composing the Ratchet Device. Recently, graphene has started to invade the scientific and the technological world with its fascinating electronic properties, such as its high electron mobility at room temperature, which distinguishes it from conventional materials that typically collide with obstacles. As a result, the idea of fabricating a Ratchet Device based on graphene instead of semiconductor heterojunctions has been introduced. Several design models, characterizations and RF measurements have been performed in order to obtain a reliable Ratchet Device suitable for many practical applications at room temperature. This has been done in the microwave frequency range and can also extend to the terahertz band
Chang, Paul Chinling. "Physics-Based Inverse Processing and Multi-path Exploitation for Through-Wall Radar Imaging." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306646674.
Full textBradai, Sonia [Verfasser], Olfa [Akademischer Betreuer] Kanoun, Olfa [Gutachter] Kanoun, Jörg [Gutachter] Himmel, and Tarak [Gutachter] Bouraoui. "Design and Modelling of a Novel Hybrid Vibration Converter based on Electromagnetic and Magnetoelectric Principles / Sonia Bradai ; Gutachter: Olfa Kanoun, Jörg Himmel, Tarak Bouraoui ; Betreuer: Olfa Kanoun." Chemnitz : Universitätsverlag Chemnitz, 2019. http://d-nb.info/121590925X/34.
Full textHicks, Chris Wayne. "Experimental and electromagnetic modeling of waveguide-based spatial power combining systems." 2002. http://www.lib.ncsu.edu/theses/available/etd-11022002-174527/unrestricted/etd.pdf.
Full textXiao, Shujun. "Modelling of electromagnetic fields in MICs based on full-wave space-time discrete numerical techniques." Thesis, 1996. http://hdl.handle.net/1828/6576.
Full textMukherjee, Souvik. "Three Dimensional Controlled-source Electromagnetic Edge-based Finite Element Modeling of Conductive and Permeable Heterogeneities." 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8317.
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