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Dissertations / Theses on the topic 'Comsol Multiphysics'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Лісовець, С. М. "Використання COMSOL Multiphysics для моделювання роботи акустичного тракту". Thesis, MDPC Publishing, 2021. https://er.knutd.edu.ua/handle/123456789/17353.

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Höhn, Tomáš. "Modelování kmitočtově selektivních povrchů v programu COMSOL Multiphysics." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217463.

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Metoda konečných prvků implementovaná v programu COMSOL Multiphysics je využívána k analýze tzv. free-standing kmitočtově selektivních povrchů ve 3D. Tyto modely jsou následně doplněny o periodické okrajové podmínky. Dále jsou free-standing povrchy doplněny o vrstvy dielektrika a je zkoumán jejich vliv na modul činitele odrazu. V analytické části jsou vyhodnoceny vlivy počtu elementů diskretizační mřížky na přesnost výsledku a délku výpočtů. Výsledky jsou srovnávány vzhledem k výsledkům uvedeným v literatuře [5]. V závěrečné části práce je vysvětlen postup při generování m-file pro obdélníkový
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Wilow, Viktor. "Electromagnetical model of an induction motor in COMSOL Multiphysics." Thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160703.

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Ansys, Flux or COMSOL are examples of software-tools that can be used to study magnetic noise, caused by magnetic forces in the air-gap, in induction motors. The project team wanted to use COMSOL in this thesis. The electromagnetical domain needs to be coupled to the mechanical domain to complete the study. The air-gap forces, calculated in the electromagnetical model using the Rotating Machinery module, can be exported to the Acoustic-Solid Interaction module in COMSOL to enable the vibro-acoustic analysis. An electromagnetical model of an induction motor is developed in two-dimensions in the
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Chen, Jie. "Modelling of Laser Welding of Aluminium using COMSOL Multiphysics." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284448.

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This thesis presents a modelling approach of laser welding process of aluminium alloy from the thermo-mechanical point of view to evaluate the occurrence of hot cracking based on simulation results and relevant criteria. The model was created stepwise in COMSOL Multiphysics, starting with the thermal model where heat conduction of solid and liquid phase was computed. Then the CFD model was created by involving the driving forces of liquid motion in the weld pool, i.e. natural convection and Marangoni effect. Lastly, the temperature profile calculated by the CFD model was loaded into the mechan
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Lövgren, Patrick. "Simulering av ett värmesystem i COMSOL Multiphysics : Pipe Flow Module." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-13212.

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Syftet med detta arbete är att simulera ett värmesystem i COMSOL Multiphysics, Pipe Flow Module, Non-Isothermal Pipe Flow som innehåller ekvationer och randvillkor för att modellera inkompressibel strömning och värmeöverföring i rör. Data om processen och dess komponenter har samlats in från industrin där arbetet är utfört och i vissa fall modifierats för att bättre beskrivas i programmet. Utifrån insamlad data har en modell byggts upp och två simuleringar har gjorts. En stationär för starten av systemet, den har sedan legat till grund för en dynamisk som simulerar förloppet från start till no
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Hedkvist, Adam, and Henrik Ahrman. "Simulation of helium flow through ion guide with COMSOL multiphysics." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-296242.

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The program COMSOL Multiphysics was used to simulate a flow of helium gas transporting ionized fission products out of an ion guide. Two important parameters to study from the simulation was the evacuation time and velocity of the ions. The mean evacuation time was shown to be 0.1173s, and the velocity of a single particle peaked at 2500m/s, 1000-1500m/s being more common.
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Júnior, Marco Antônio Vasiliev da Silva. "Estudo experimental e modelagem matemática da secagem convectiva de fatias de gel de amido-alginato." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/74/74133/tde-22102018-164651/.

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Os biopolímeros comestíveis, tais como amido e alginato, podem ser utilizados na formulação de géis com elevada capacidade de retenção de água. A secagem convectiva pode ser utilizada para a remoção da umidade em géis. Os parâmetros da secagem (temperatura, velocidade do ar e umidade de equilíbrio) necessitam ser monitorados para a produção de um sólido seco e sem degradação de compostos ativos. A modelagem matemática da secagem pelo método numérico de elementos finitos em COMSOL Multiphysics tem sido utilizada para simular a secagem, usando um número reduzido de ensaios experimentais. Este tr
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Vicario, Gaia. "Analisi acustica di una finestra forata: modellazione numerica mediante COMSOL multiphysics." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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“Immaginate di potervi rilassare a casa in una giornata d’estate tenendo le finestre aperte per lasciare passare la brezza ma senza essere disturbati dai rumori della città, oggi è possibile”. Quello che voglio fare attraverso questa tesi è di studiare la fattibilità per la realizzazione di una finestra che permetta il passaggio dell’aria ma non dei rumori. L’idea di questa particolare finestra silenziosa mi è stata fornita dallo studio fatto dal professor Sang-Hoon Kim del Mokpo National University maritime e dal professor Seong-Hyun Lee del Korea Institute of Machinery and Materials in C
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Лісовець, С. М. "Застосування COMSOL Multiphysics 5.6 при здійсненні неруйнівного акустичного контролю текстильних матеріалів". Thesis, Херсонський національний технічний універсітет, 2021. https://er.knutd.edu.ua/handle/123456789/17835.

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Erlandsson, Simon. "Evaluation, adaption and implementations of Perfectly Matched Layers in COMSOL Multiphysics." Thesis, KTH, Numerisk analys, NA, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280757.

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Perfectly matched layer (PML) is a commonly used method of absorbing waves at a computational boundary for partial differential equation (PDE) problems. In this thesis, methods for improving the usability of implementations in Comsol Multiphysics is addressed. The study looks at complex coordinate stretching PMLs in the context of Helmholtz equation using the finite element method (FEM). For a PML to work it has to be set up properly with parameters that takes into account the properties of the problem. It is not always straight forward. Some theory behind PMLs is presented and experimentation
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Liljestrand, Simon, and Viktor Lundell. "Fuktkontroll av en ventilerad platta på mark : Modellering i COMSOL Multiphysics 5.5." Thesis, Högskolan i Gävle, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-32653.

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Krypgrunder i någon form har använts som grundkonstruktion i Sverige under långtid. Förr var det torpargrunder som med tiden blev isolerade krypgrunder och plintgrunder. Gemensamt för krypgrundskonstruktioner som är ventilerade med utomhusluft är att under sommarhalvåret blir det förhöjda relativa ånghalter. Syftet med fallstudien är att studera en uteluftsventilerad konstruktion med välisolerat bjälklag och markisolering. Konstruktionen är nedgrävd och ventilationen i grunden sker via en tunn spalt under marknivå. Luftspaltens temperatur och relativa ånghalt är av intresse för att avgöra om d
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Karlsson, Fredrik, and Samuel Mani. "Beräkning och sammanställning av linjära köldbryggor : En jämförelse mellan HEAT2 och COMSOL Multiphysics." Thesis, KTH, Byggvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174115.

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I dagens samhälle ligger stort fokus på att bygga miljövänliga och energieffektiva byggnader. För att möta de allt mer skärpta energikraven måste hela klimatskalet beaktas där köldbryggor utgör en betydande del. Examensarbetet går ut på att göra en sammanställning av linjära köldbryggor (ψ) för vanligt förekommande konstruktionsdetaljer där köldbryggor finns. Sammanställningen där olika isoleringsmaterial på fasadskiva och isolertjocklekar tabelleras, ska underlätta för framtida projektering. Två simuleringsprogram för beräkning av köldbryggor har jämförts och utvärderats med varandra. Utvärde
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Pla, Rubio Begoña. "The bearing capacity of Nordic soil." Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175893.

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Heavy forestry machines have great immediate effect on soil properties. This increases the interest to develop approaches that help understanding better the interaction between the forest machines and the terrain and consequently develop the forwarders to be gentle to the environment. The most predominant indications of soil disturbances caused by harvesting are mainly rutting and soil compaction. It is critical to understand and evaluate these damages to be able to protect the remaining trees and improve their tree growth rate. Comprehending the bearing capacity of the soil and the interactio
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Cedell, Olle, and Elias Ljunggren. "Dimensionering av varmvattenavstick för att undvika Legionellatillväxt : En simuleringsstudie utförd i COMSOL Multiphysics​." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-281994.

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Bakterien Legionella pneumophila orsakar sjukdomen Legionella vilket har ökat i världen de senaste 20 åren och har troligtvis ett ännu större mörkertal. Den frodas i vattenrör mellan temperaturen 25–50 grader och vid installation av varmvattenrör i byggnader måste det tas hänsyn i riskzoner. Ett speciellt riskområde är varmvattenavstick som skapas för att kunna dra vidare vattenrör i framtiden. Där utsätts vattnet för större risk för stillastående och sjunkande temperaturprofil beroende på längd. Med hjälp av COMSOL Multiphysics® Modelling Software har ett teoretiskt ram
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Dahlin, Linus, and Marcus Hedman. "Undersökning av värmeförluster genom kantbalk vid användning av golvvärme : En simuleringsundersökning i COMSOL Multiphysics." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-27163.

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I Sverige ställs allt högre krav på nya byggnader genom bestämmelser och lagar som påverkar energianvändningen. Byggnader kan värmas upp med hjälp av olika typer av distributionssystem såsom radiatorer och golvvärme. Värmebehovet hos byggnaden baseras på hur mycket värmeenergi som behövs för att uppnå termisk komfort. För att begränsa energianvändningen används isolering i syfte att minimera värmeförlusterna genom byggnadens klimatskärm. Denna undersökning syftar till att undersöka förluster som sker genom kantbalken vid användning av vattenburet golvvärmesystem och hur dessa förluster påverka
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Potrymai, Eduard, and Ivan Perstnov. "Time Dependent Modelling and Simulation of the Corona Discharge in Electrostatic Precipitators." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-33293.

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Corona discharge is one of the crucial problems related with high-voltage equipment. This paper focuses on the physical and numerical modelling of corona discharge in an Electrostatic precipitator (ESP). The model is based on Maxwells equations and the Finite element method (FEM) and is implemented with the COMSOL Multiphysics software.The simulation allows studying the electric charge distribution and the behaviour of the electric field inside the ESP. The work is focused primarily on time-dependent studies of the corona discharge.
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Jahan, Israt. "Implementation and experimental evaluation of a parameterized PMSynRM model using Matlab and Comsol Multiphysics." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265782.

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This thesis focuses on modelling of the permanent magnet synchronous reluctancemotor (PMSynRM), which has drawn considerable attention by researchers thanks toits high efficiency and wide range of speed operation. Comparisons with measurementsfrom a four-pole PMSynRM with four barriers and 24 stator slots have been carriedout. In this thesis work, Matlab and Comsol Multiphysics are used to implement theparameterized PMSynRM model.Models of the PMSynRM in two-dimensions (2D) and three-dimensions (3D) havebeen implemented. The electromotive force (back emf) at no load condition for a fullpitchan
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Ahmad, Muhammad, and Jhanzeb Jhanzeb. "Modeling and Simulation of an Electrostatic Precipitator Including a Comsol Multiphysics Guide for Modeling an ESP." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-10685.

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Gaseous exhaust of different industries contains dust particles of different chemical precipitates that are harmful for the environment. Electrostatic Precipitators are very often used in industries to filter their gaseous exhaust and to prevent the atmosphere to being polluted. Electrostatic Precipitators are very efficient in their work. Electrostatic Precipitators use the force of the electric field to separate the dust particles from gaseous exhaust. Electrostatic Precipitators charge the dust particles and remove these particles by attracting these charged dust particles toward the collec
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Berggren, Oscar. "COMSOL Multiphysics - Ett energitekniskt analysverktyg vid numerisk simulering av köldbryggor och analys av fukt i konstruktionesdetaljer." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-91647.

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Berggren, O. (2014) COMSOL Multiphysics – Ett energitekniskt analysverktyg vid numerisk simulering av köldbryggor och analys av fukt i konstruktionsdetaljer. Examensuppsats i ämnet energiteknik. Institutionen för tillämpad elektronik och fysik vid Umeå Universitet. Konsultföretaget Tyréns har vid sitt kontor i Umeå önskat att utvärdera tillämpningen av programvaran COMSOL Multiphysics. Arbetet bestod av att på nytt simulera och analysera en energiteknisk problemställning, som sedan tidigare ska ha genomförts vid Tyréns. Det valda projektet kallas i detta arbete för referensprojektet och är en
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Friberg, Gustav. "Efficient Quadrature Settings for Elliptic PDE’s using a Coupled FEM and BEM Solver in COMSOL Multiphysics." Thesis, KTH, Numerisk analys, NA, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150124.

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By using singular integral kernels based on the fundamental solution, a partial differential equation (PDE) can be rewritten as a boundary integral defined at the boundary of a domain. This requires a linear differential operator with coefficients that are isotropic and homogeneous in space. In this report, emphasis is put on PDE’s related to electromagnetics i.e., Laplace’s and Helmholtz equation. Both three- and two-dimensional model problems will be investigated. Galerkin’s method is implemented in order to discretize the domain, now with one less spatial dimension. Hence, the solution is e
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Paulsson, Johan. "Simulering av ändrad flödesriktning vid kylning av frukt : Med avseende på minskade nedkylningstider och uniformitet." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-28739.

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Sjökvist, Stefan. "Demagnetization Studies on Permanent Magnets : Comparing FEM Simulations with Experiments." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-236301.

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In a world where money often is the main controlling factor, everything that can be tends to be more and more optimized. Regarding electrical machines, developers have always had the goal to make them better. The latest trend is to make machines as efficient as possible, which calls for accurate simulation models where different designs can be tested and evaluated. The finite element method is probably the most popular approach since it makes it possible to, in an easy and accurate way, get numerical solutions to a variety of physics problems with complex geometries and non-linear materials. T
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Болюх, Владимир Федорович, та Александр Иванович Кочерга. "Трехмерное моделирование распределения вихревых токов в ферромагнитной пластине". Thesis, НТУ "ХПИ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22126.

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Andersson, Lucas. "Shadow effects in open cross-sections : An analysis of steel temperatures with COMSOL Multiphysics, TASEF and Eurocode." Thesis, Luleå tekniska universitet, Byggkonstruktion och brand, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70086.

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Steel is a material commonly used in various constructions such as high-rise buildings, sport arenas, ships etc. Steel is a versatile building material due to its isotropic characteristics, e.g. both high tensile- and compressive strength. This allows steel to be formed into open section profiles which reduces material usage but simultaneously allows the tensile- and compressive stress resistance to be high in directions were loads are applied. Although steel has a high stress resistance its sensitivity to fire is larger than other building materials due to its high thermal conductivity. The s
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Tyagi, Abhimanyu. "Simulation of a scaled down version of a run-around coil heat recovery system on COMSOL® Multiphysics." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264263.

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Due to changing anthropological activities, the consumption of resources is continuously increasing. As humans are spending more time indoors, the energy demand is also increasing. The building sector is a major consumer of energy. In buildings, space heating is important to maintain a comfortable space. For this, apart from increasing the thermal insulation and wellconstructed buildings, air-air heat recovery systems(among others) are being used to precondition the ambient air, so that the exhaust air from the conditioned space can pre-heat/ pre-cool the ambient air, depending on the season.
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Mostafa, Massaud. "Etude du perçage et du soudage laser : dynamique du capillaire." Phd thesis, Université de Bourgogne, 2011. http://tel.archives-ouvertes.fr/tel-00692412.

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L'objectif de ce travail est d'étudier expérimentalement la formation du capillaire durant le perçage et le soudage par faisceau laser, et de développer une simulation numérique permettant de reproduire la dynamique de formation et d'évolution du capillaire. Nous avons fait le choix d'utiliser comme matériau test le Zinc, en raison de ses propriétés thermodynamiques. Afin de simplifier le problème, nous avons étudié dans un premier temps le mécanisme de perçage. Deux méthodes expérimentales ont été utilisées pour caractériser l'évolution de la géométrie du capillaire : La méthode DODO (Direct
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Östlin, Olof, and Havik Mikaela Sjödén. "Kalibrering och validering av en IDA ICE modell : Ett flerbostadshus från 1970-talets miljonprogram." Thesis, Högskolan i Gävle, Energisystem och byggnadsteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-32798.

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Aktuellt examensarbete är en fallstudie som utförts på en miljonprogramsbyggnad i Andersberg ägd av AB Galvegårdarna vilka även är uppdragsgivarna. Då miljonprogramsbyggnader är dåligt värmeisolerade och har stora värmeläckage är det idag av stort intresse att se över eventuella förbättringsåtgärder då dessa byggnader har en potential att minska energianvändningen med 50 procent. Syftet med detta projekt är att få en kalibrerad och validerad modell med hjälp av den BES-modell (Building Energy System) som kommer att tas fram i detta examensarbete. Genom litteraturstudie, platsbesök samt inhämtn
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Engström, Iris. "Steady-state hydrogeological modelling in order to investigate groundwater sensitivity." Thesis, KTH, Mark- och vattenteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171824.

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Growing regions and tighter zoning in urban areas are pushing the hydrological bal-ances to establish new equilibriums which are causing a stress on the groundwater. Urbanization can affect the groundwater in several ways in which both raising and lowering of groundwater tables are a possibility. Both ways, sudden changes may bring on socioeconomic costs for the unprepared. Hydrogeological modelling creates the possibilities to visualise processes that cannot be seen with the naked eye. By combin-ing knowledge about the studied area from tests and measurements a conceptual model and additional
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Wegman, Kevin R. "Numerical Modeling of a Printed Circuit Heat Exchanger Based on Experimental Results from the High-Temperature Helium Test Facility." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461266010.

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Wiklund, Henrik. "Numerical calculations of optical structures using FEM." Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7326.

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<p>Complex surface structures in nature often have remarkable optical properties. By understanding the origin of these properties, such structures may be utilized in metamaterials, giving possibilities to create materials with new specific optical properties. To simplify the optical analysis of these naturally developed surface structures there is a need to assist data analysis and analytical calculations with numerical calculations.</p><p>In this work an application tool for numerical calculations of optical properties of surface structures, such as reflectances and ellipsometric angles, has
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Koutný, Petr. "Relativní snímač polohy." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220125.

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This thesis deals with design of optimal parameters of a relative displacement sensor, working on the electrodynamics principle. The sensor is based on the voltage induction to the coil placed in changing magnetic field. Thesis is divided into three parts: introductory, theoretical and practical. The introductory part provides basic relationships between displacement, velocity and acceleration sensors. The theoretical part contains physical concepts and describes relationships necessary for calculations and creating a model of permanent magnet in COMSOL Multiphysics. In thesis further presents
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Brik, Mostafa El Mehdi. "Influence des champs électriques sur l’écoulement au sein d’une goutte isolée et leurs effets sur les interactions entre gouttes." Thesis, Pau, 2015. http://www.theses.fr/2015PAUU3040/document.

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Les interactions entre des gouttes ou des bulles sont rencontrées dans de nombreuses applications industrielles et/ou environnementales. Ici, nous nous intéressons à l’électro-coalescence qui a des applications importantes comme par exemple la séparation eau/pétrole (coalescence de gouttelettes d'eau dans du pétrole). L’étude a été consacrée à l’élaboration et à la mise point de modèles basés sur les équations de Navier-Stokes et les équations régissant les champs électriques au niveau d’une seule goutte ainsi que l’interaction entre deux gouttes et plus particulièrement l’effet des forces hyd
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Lindqvist, Daniel. "Simulation of Intermittent Current Interruption measurements on NMC-based lithium-ion batteries." Thesis, Uppsala universitet, Strukturkemi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-325298.

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The objective of this report was to implement battery cycling and an intermittent current interruption (ICI) method for determining battery resistance into a simple lithium-ion battery model in the finite element methods (FEM) program COMSOL Multiphysics, andevaluate how accurately the model reflects the behaviour of voltage and internal resistance with respect to experimental results. The ICI technique consists of repeating the steps of first having a longer charging period and then having a short current interruption, where the internal resistance is calculated from the voltage drop that occ
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34

Stevens, Lorin E. "Thermo-Piezo-Electro-Mechanical Simulation of AlGaN (Aluminum Gallium Nitride) / GaN (Gallium Nitride) High Electron Mobility Transistor." DigitalCommons@USU, 2013. http://digitalcommons.usu.edu/etd/1506.

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Due to the current public demand of faster, more powerful, and more reliable electronic devices, research is prolific these days in the area of high electron mobility transistor (HEMT) devices. This is because of their usefulness in RF (radio frequency) and microwave power amplifier applications including microwave vacuum tubes, cellular and personal communications services, and widespread broadband access. Although electrical transistor research has been ongoing since its inception in 1947, the transistor itself continues to evolve and improve much in part because of the many driven researche
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35

Morelli, Roberto. "Studio dell'emissione per effetto di campo di una matrice di nanotubi di carbonio multi-wall." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14003/.

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L’obiettivo di questa tesi è quello di studiare alcuni aspetti fondamentali riguardanti l’emissione elettronica per effetto di campo di una matrice di nanotubi di carbonio (CNT) multi-wall. Tra questi vi è: il fattore β di intensificazione del campo elettrico, l’effetto di schermatura elettrostatica e l’effetto di carica spaziale. Le informazioni acquisite, tramite un approccio computazionale sono state utilizzate per approfondire lo studio del comportamento emissivo sperimentale, di una tipologia particolare di campioni, costituiti da una densità molto elevata (1010 CNT/cm2) di nanotubi inser
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36

Salomonsson, Stefan. "Simulation of Temperature Distribution in IR Camera Chip." Thesis, Linköpings universitet, Informationskodning, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-65830.

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The thesis investigates the temperature distribution in the chip of an infrared camera caused by its read out integrated circuit. The heat from the read out circuits can cause distortions to the thermal image. Knowing the temperature gradient caused by internal heating, it will later be possible to correct the image by implementing algorithms subtracting temperature contribution from the read out integrated circuit. The simulated temperature distribution shows a temperature gradient along the edges of the matrix of active bolometers. There are also three hot spots at both the left and right ed
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37

Berg, Ludvig, and Johannes Wanselius. "Magnetitinblandad gjutasfalt : Uppvärmning och avsvalning." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-83236.

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Uppvärmningen av gjutasfalt har traditionellt sett skett med fossila bränslen. Projektet SMMART undersöker möjligheterna att med inblandning av magnetit i asfaltsmassan kunna nyttja mikrovågsteknik för uppvärmning. Detta examensarbete är uppdelat i två delar. Första delen behandlar uppvärmningen av magnetitinblandad asfaltsmassa och andra delen avsvalningsförloppet vid utläggning. Del 1 Numeriska tredimensionella simuleringar med simuleringsverktyget COMSOL Multiphysics har utförts för att undersöka hur uppvärmningen påverkar temperaturskillnaden mellan den inblandade magnetiten och resterand
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38

Bíreš, Pavol. "Numerické metody výpočtu elektromagnetického pole." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218771.

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The aim of the work is to study the electromagnetic field theory, finite element method and the interaction of electromagnetic field with tissues. Gained knowledge is then used to calculate spreading of the electromagnetic field in the microwave field and to create a temperature profile of spreading the electromagnetic fields in human tissue. The finite element method was implemented in the Matlab programming environment, where the 1D model was created in the frequency and time domain and a simple 2D model created in time domain. The program was developed to analyze spreading electromagnetic w
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39

Bordoni, Lorenzo. "Studio e realizzazione di provini piezoelettrici flessibili per applicazioni di sensoristica." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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L’obiettivo del progetto europeo MyLeg è quello di realizzare una nuova generazione di protesi transfemorali motorizzate che possano essere utilizzate in modo intuitivo e affidabile. L’aspetto innovativo riguarda la presenza di un impianto osteointegrato e di sensori mioelettrici impiantabili su muscoli innervati per estendere le capacità cognitive dell’utente, aumentando la percezione della gamba protesica e la capacità di movimento. Il lavoro di Tesi si focalizza su uno dei tantissimi aspetti del progetto, che riguarda lo sviluppo di un sensore piezoelettrico flessibile da integrare nella p
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40

Ng, Kiang Chuan. "Calculation of the transition matrix for the scattering of acoustic waves from a thin elastic spherical shell using the COMSOL Multiphysics Finite-Element Code." Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/10661.

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In acoustics, the so-called Transition, or T-matrix relates the incident and scattered acoustic pressures of an object or scatterer. The T-matrix of a thin steel spherical shell in water has been determined by the COMSOL Multiphysics Finite-Element Code. The shell has an outer radius of 0.5m and a thickness of 1cm. It is driven at a frequency of 474 Hz such that ka=1 (where k is the acoustic wave number and a is the outer radius of the shell). A standing wave, represented by a spherical Bessel function, is incident onto the shell surface and the corresponding scattering coefficient is compu
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41

Lisnyak, Marina. "Theoretical, numerical and experimental study of DC and AC electric arcs." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2013/document.

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L’apparition accidentelle d’un arc électrique dans le système de distribution électrique d’un aéronef peut compromettre la sécurité du vol. Il existe peu de travaux liés à cette problématique.Le but de ce travail est donc d’étudier le comportement d’un arc électrique, en conditions aéronautiques,par des approches théorique, numérique, et expérimentale. Dans ce travail, un modèle MHD de la colonne d’arc à l’ETL a été utilisé, et résolu à l’aide du logiciel commercial comsolMultiphysics. Afin de décrire l’interaction plasma-électrodes, le modèle a dû étendu pour inclure les écarts à l’équilibre
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42

Ivanenko, Yevhen. "Modelling and Simulation of Electrostatic Precipitators with a Dust Layer." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-44773.

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A dust layer, especially based on high-resistivity dust, at the collecting electrodes may cause a back corona discharge in electrostatic precipitators (ESP). It can significantly reduce the ESP efficiency and as a result cause ecological damages. To study the dust layer influence inside ESPs, it is necessary to derive an adequate model of the ESP precipitation process with a dust layer at the collecting electrode. The research of the present thesis is focused on stationary studies of the precipitation process with a dust layer at the collecting electrode in ESPs. Three mathematical models are
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43

George, Brian Patrick. "Experimental and Computational Modeling of Ultrasound Correlation Techniques." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1270663937.

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44

Bažantová, Lucie. "Modelování ohřevu tkání v KV diatermii." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219736.

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This thesis deals with the basic theory of the electromagnetic field in the first part and the field interactions with biological tissues. Than describes shortwave diathermy as a technique used for purposes of medical treatment. The aim is to built a model of tissue heating in shortwave diathermy in COMSOL Multiphysics environment, so there is included a description of the programming environment, including the mathematical method that COMSOL uses for calculations. The output of the whole work is a model of the lower limb in the knee part and display the results after his diathermy heating.
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45

Wampler, Dean Thomas. "Fluid Flow Characterization and in Silico Validation in a Rapid Prototyped Abdominal Aortic Aneurysm Model." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1805.

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Aortic aneurysms are the 14th leading cause of death in the United States. Annually, abdominal aortic aneurysm (AAA) ruptures are responsible for 4500 deaths. There are another 45,000 repair procedures performed to prevent rupture, and of these approximately 1400 lead to deaths. With proper detection, the aneurysm may be treated using endovascular aneurysm repair (EVAR). Understanding how the flow of the blood within the artery is affected by the aneurysm is important in determining the growth of the aneurysm, as well as how to properly treat the aneurysm. The goal of this project was to devel
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46

Le, Lous Morgan. "Transferts de pression, de masse et d'énergie au sein des systèmes aquifères grandes profondeurs : application à la géothermie haute énergie." Thesis, Bordeaux 3, 2017. http://www.theses.fr/2017BOR30003.

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Utilisée depuis des milliers d’années sous ses manifestations naturelles par l’Homme, cette ressource fait l’objet d’une exploitation commerciale depuis seulement le XXe siècle, à destination du chauffage de bâtiments, de certains usages industriels ainsi que de la production d’électricité. La France compte parmi les pionniers concernant l’usage direct de la chaleur alors qu’aucune filière industrielle n’est véritablement effective pour la production d’électricité d’origine géothermique. Le projet sélectionné, intitulé FONGEOSEC, a pour objectif la conception et la réalisation d’un démonstrate
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47

Ryšánek, Martin. "Vícepásmová magnetická anténa." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218593.

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The thesis deals with a parametric analysis of a magnetic multiband antenna and explains the principle of its operation. In the thesis, an optimization of the antenna by the particle swarm optimization is performed in order to meet impedance matching in prescribed frequency bands.
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48

Kazi-tani, Zakaria. "Simulation of Hardening of the MahanaKhon Tower Mat Foundation." Thesis, KTH, Betongbyggnad, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-244030.

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Cement hydration is the result of a series of simultaneous chemical reactions occurring during the production of concrete. An excessive amount of heat is generated, which consequently may give rise to thermal stresses and cause early age cracks in concrete that may affect its structural integrity, and load bearing capacity. Incorporating fly ash into the concrete mixture has shown to be an efficient method to reduce the temperatures developed during early age hydration, especially for massive concrete structures. Fly ash does additionally affect the concrete's development of compressive streng
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49

Lorenzi, Giulia. "Studio delle proprietà elettriche di materiali nanocompositi a base di resina epossidica additivati con nanografite." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Le nanotecnologie rappresentano un nuovo approccio tecnologico basato sulla conoscenza e sulla manipolazione della materia su scala nanometrica. Numerosi sono i settori industriali interessati a queste nuove tecnologie. L’elaborato di tesi rientra nell’ambito dell’ingegneria elettrica e riguarda, in particolare, materiali isolanti additivati con particelle nanometriche conduttive. Le principali applicazioni sono rappresentate dagli accessori per cavi elettrici, quali ad esempio giunti e terminali, dove è necessario gradare il campo elettrico e la corrente, evitando che stress eccessivi danneg
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50

Franchini, Federico. "Studio e realizzazione di provini piezoelettrici flessibili per applicazioni di sensoristica." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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L’obiettivo del lavoro di Tesi è stato quello di produrre dal punto di vista sperimentale un sensore piezoelettrico mediante l’utilizzo di materiali e processi innovativi. È stato inoltre sviluppato un modello elettromeccanico sfruttando il software COMSOL Multiphysics®, che ha permesso di validarne sul piano teorico l’efficienza e fattibilità. I sensori piezoelettrici sfruttano la proprietà di alcuni materiali, di indurre una ridistribuzione delle cariche interne a seguito dell’applicazione di una sollecitazione di tipo meccanico. Inoltre, per garantire la flessibilità e la resistenza che car
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