Thèses sur le sujet « SIMSCALE »
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1
Gautam, Mahesh. « Exploring Memristor Based Analog Design in Simscape ». Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc271817/.
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With conventional CMOS technologies approaching their scaling limits, researchers are actively investigating alternative technologies for ever increasing computing and mobile demand. A number of different technologies are currently being studied by different research groups. In the last decade, one-dimensional (1D) carbon nanotubes (CNT), graphene, which is a two-dimensional (2D) natural occurring carbon rolled in tubular form, and zero-dimensional (0D) fullerenes have been the subject of intensive research. In 2008, HP Labs announced a ground-breaking fabrication of memristors, the fourth fundamental element postulated by Chua at the University of California, Berkeley in 1971. In the last few years, the memristor has gained a lot of attention from the research community. In-depth studies of the memristor and its analog behavior have convinced the community that it has the potential in future nano-architectures for optimization of high-density memory and neuromorphic computing architectures. The objective of this thesis is to explore memristors for analog and mixed-signal system design using Simscape. This thesis presents a memristor model in the Simscape language. Simscape has been used as it has the potential for modeling large systems. A memristor based programmable oscillator is also presented with simulation results and characterization. In addition, simulation results of different memristor models are presented which are crucial for the detailed understanding of the memristor along with its properties.
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Kachlík, Jan. « Model elektrického vozidla v programu SIMULINK/SIMSCAPE ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219034.
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The topic of this diploma thesis is mathematical model of electric vehicle. The traction drive consists of Li-Ion battery, free-phase DC/AC converter and permanent magnet synchronous machine. The main goal of the thesis is development of function model and making simulations in SIMULINK/SIMSCAPE program. Work is divided into three main parts. The first part is dedicated to the theoretical description of the main drive components. The second part describes partial subsystems of the model. In the last part is build a complete model of electric vehicle and simulated different driving mode.
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Dhayal, Vandana Sultan Singh. « Exploring Simscape™ Modeling for Piezoelectric Sensor Based Energy Harvester ». Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984261/.
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This work presents an investigation of a piezoelectric sensor based energy harvesting system, which collects energy from the surrounding environment. Increasing costs and scarcity of fossil fuels is a great concern today for supplying power to electronic devices. Furthermore, generating electricity by ordinary methods is a complicated process. Disposal of chemical batteries and cables is polluting the nature every day. Due to these reasons, research on energy harvesting from renewable resources has become mandatory in order to achieve improved methods and strategies of generating and storing electricity. Many low power devices being used in everyday life can be powered by harvesting energy from natural energy resources. Power overhead and power energy efficiency is of prime concern in electronic circuits. In this work, an energy harvester is modeled and simulated in Simscape™ for the functional analysis and comparison of achieved outcomes with previous work. Results demonstrate that the harvester produces power in the 0 μW to 100 μW range, which is an adequate amount to provide supply to low power devices. Power efficiency calculations also demonstrate that the implemented harvester is capable of generating and storing power for low power pervasive applications.
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Narkhede, Yashdeep. « Simscape modeling of motor generator unit component for hybrid electric vehicle ». Thesis, Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55047.
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The thesis introduces the user to programming in Simscape language. A permanent magnet synchronous machine torque control drive system for hybrid electric vehicles has been analyzed, programmed, using Simscape language, and tested in this
thesis. The thesis walks the reader through the process of creating custom components in Simscape language explaining details and syntax of the language at every step. Important excerpts of code for all the components designed, created and used in
the process are explained in the thesis and the complete code for the same is provided in the Appendix. ix
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Bragoni, Alessio. « Visualizzazione della dinamica di un sincrocottero tramite integrazione del modello CAD in ambiente di simulazione ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
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Il lavoro presentato tratta la modellazione di un elicottero a rotori sincronizzati mediante il programma di CAD (Computer-aided Design) Solidworks. Tale assieme è poi utilizzato attraverso Simulink e Simscape Multibody per visualizzare in ambiente grafico, attraverso animazioni 3D, gli esiti della simulazione matematica del velivolo equivalente a quello creato mediante il software di disegno. Questa strategia è possibile grazie ad una perfetta sinergia tra i software utilizzati e permette di avere a disposizione una visualizzazione intuitiva del comportamento dei modelli matematici, anche complessi, durante simulazione.
Il metodo è applicabile a qualsiasi velivolo o più in generale assieme meccanico, a patto che vengano lasciati i giusti gradi di libertà e che essi presentino poi un riscontro con quelle che sono le grandezze all’interno della simulazione.
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Enocksson, Staffan. « Modeling in MathWorks Simscapeby building a model of an automatic gearbox ». Thesis, Uppsala universitet, Avdelningen för systemteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-151891.
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The purpose of this thesis work has been to analyze the usability and the feasibility formodeling with MathWorks simulation tool Simscape by building a simplified model ofthe automatic gearbox ZF-ECOMAT 4 (HP 504 C / HP 594 C / HP 604 C). It hasbeen shown throughout the thesis how this model is build. First has systemknowledge been acquired by studying relevant literature and speaking with thepersons concerned. The second step was to get acquainted with Simscape and thephysical network approach. The physical network approach that is accessible throughthe Simscape language makes is easy to build custom made components with means ofphysical and mathematical relationships. With this background a stepwise approachbeen conducted which has led to the final model of the gearbox and the validationconcept. The results from this thesis work indicates that Simscape is a powerful tool formodeling physical systems and the results of the model validation gives a good signthat it is possible to build and simulate physical models with the Simscape software.However, during the modeling of the ZF-ECOMAT 4 some things have beendiscovered which could improve the usability of the tool and make the learning curvefor an inexperienced user of physical modeling tools less steep. In particular, a largermodel library should be included from the beginning, more examples of simple andmore complex models, the object-oriented related parts such as own MATLABfunctions should be expanded, and a better troubleshooting guidance.
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Horňan, Bohdan. « Monitorování stavu mechatronických systémů ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442530.
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This thesis is concerned with condition monitoring and quantitative analysis of synchronous motors. Constantly rising requirements on the reliability of motors develop new methods of predictive diagnostics, which can identify failure conditions in the initial stage. Created mechatronic systems with the implemented failure from pre-prepared PMSM model are tested by unconventional condition monitoring methods. Software solutions of diagnostics and model designs of the mechatronic systems are implemented in MATLAB & Simulink. Part of this work is also a short introduction to the issue with necessary theoretical fundamentals and research of some selected methods of predictive diagnostics.
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Kwan, Bradley Y. « Modeling and Control of a Vertical Hopping Robot ». DigitalCommons@CalPoly, 2021. https://digitalcommons.calpoly.edu/theses/2323.
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Single degree-of-freedom hopping robots are typically modeled as spring loaded inverted pendulums (SLIPs). This simplified model, however, does not consider the overall leg geometry, consequently making it difficult to investigate the optimized inertial distribution of the leg for agile locomotion. To address this issue, the first part of this thesis establishes an accurate mathematical model of a DC-motor-driven, two-link hopping robot where the motors are modeled as torque sources. The equations of motion for the two distinct phases of locomotion (stance and flight) are derived using the Lagrangian approach for holonomic systems. A Simulink/Stateflow model is developed to numerically simulate the robot’s locomotion. The model is then validated with the simulation data from Simscape Multibody, which allows for accurate modeling of the environment and inertial properties for complex geometries. With the accurate model of the hopping robot, two distinct control strategies are adopted. The first strategy focuses on implementing position control while the robot is in flight to prepare for touchdown. The second control method explores implementing impedance control during stance, allowing the response to mimic that of a mass-spring-damper model. It was found that concentrating the mass of the robot in the hip allows the robot to attain larger apex heights as opposed to evenly distributing the mass throughout the leg. With plans to implement the leg on a quadruped robot, the mathematical model is easily expandable to 2 or 3 degrees-of-freedom. This allows for further stability analysis and development of control strategies of the leg.
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Mellia, Federico. « Modelling and control of an hydraulic press for the tile industry ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
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To sum up, the objective of the project was to construct a mathematical model that would sufficiently describe the behaviour of the complex hydraulic press system under analysis.
Through the Simscape tool inside the Simulink environment, it was possible to select elementary blocks that expressed similar physical behaviour with respect to those corresponding elements comprising the real machine.
The second goal of the project was to analyze different control designs, that could be implemented given the control variables at disposal, to minimize the filling error inside the piston chamber.
Such error if present could cause instability in the vertical motion of the hydraulic cylinders, as well as deviation of pressure value inside the chamber from the optimal one, requested to achieve good performances in the tile formation process.
The current open-loop behaviour has been shown to generate large filling errors during the pressing cycle, and such errors have been drastically reduced up to an order of $10$, by implementing the closed-loop control schemes presented.
The first control scheme is based on a feedback measurement coming from an hydraulic volumetric flow rate sensor, and even though it showed good performances relative to the minimization of the filling error, it lacks in practicality, since such sensor is not available in the real setup.
Therefore, a closed-loop control scheme based on the pressure measurement feedback, and an hysteresis controller, forcing the pressure signal to remain inside a bandwidth around the optimal value, has produced similar if not better results with respect to the more theoretical approach but with the advantage of practicality.
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Haimerl, Felix K. « Dynamics Simulation and Optimal Control of a Multiple-input and Multiple-output Balancing Cube ». DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/2078.
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This thesis document outlines the development of a multibody dynamics simulation of an actively stabilized multiple-input, multiple-output, coupled, balancing cube and the process of verifying the results by implementing the control algorithm in hardware. A non-linear simulation of the system was created in Simscape and used to develop a Linear Quadratic Gaussian control algorithm. To implement this algorithm in actual hardware, the system was first designed, manufactured, and assembled. The structure of the cube and the reaction wheels were milled from aluminum. DC brushless motors were installed into the mechanical system. In terms of electronics, a processor, orientation sensor, motor drivers, analog to digital converters, and a pulse width modulation board were assembled into the cube. Upon completion, the software to control the cube was developed using Simulink and run on a Raspberry Pi computer within the mechanism.
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BLANCO, FERNÁNDEZ Oscar. « Analysis and Dimensioning of a Large Scale Solar Cooking System : A solution for the Base of the Pyramid Market ». Thesis, KTH, Kraft- och värmeteknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240286.
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This thesis introduces an analysis and dimensioning of a solar powered solution for enabling clean and sustainable cooking in developing areas. Access to clean cooking is a great challenge hindering human development, with significant health, environmental, and economic implications. The proposed solution is analysed and modelled in this work. Recommendations are given on the development of the project, reviewing the critical factors for its success. The solution is a novel approach for providing power for cooking through solar energy. Targeted market segment is institutional cooking, where current cooking fuels are commonly based on firewood and charcoal. The system integrates a solar trough collector array, an oil heat storage, a heating unit for the cooking recipient, and two thermosiphons for transporting the heat between each component. The technology is under development, requiring an accurate analysis and further work in the design. The work presented analyses the solution and its implementation in a specific case study. A modelling software was built as a tool for dimensioning the technology and observing its behaviour. Moreover, specific values were obtained on the dimensions for the case study. A structured critic of the system through a deep review allowed for observations on risks, future work, and additional recommendations. Simulations for the case study enabled the first values on the dimensions of the system. Flexibility of the model was provided to repeat this exercise for future case studies. The analysis unexpected critical factors for the solution such as user behaviour and reviewed expected ones such as the insulation or the size of the heat storage. There are still many challenges to overcome for the success of the analyzed project. This thesis gives a basis for future work and strong guidance for the development of the solution.
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Sjöstedt, Carl-Johan. « Modeling and Simulation of Physical Systems in a Mechatronic Context ». Doctoral thesis, KTH, Maskinkonstruktion (Avd.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10522.
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This thesis gives different views on the modeling and simulation of physical systems, especially together with embedded systems, forming mechatronic systems. The main considered application domain is automotive. One motivation behind the work is to find suitable representations of physical systems to be used in an architectural description language for automotive embedded systems, EAST-ADL2, which is implemented as a UML2 profile, and uses concepts from both UML and SysML. As a part of the thesis, several languages and tools are investigated, including bond graphs, MATLAB/Simulink, Ptolemy II, Modelica, MATLAB/Simscape and SysML. For SysML, the modeling of continuous-time systems and how it relates to MATLAB/Simulink and Modelica is evaluated. A case study of an electric power assisted steering is modeled to show the differences, the similarities and the usage of the above mentioned languages and tools. To be able to classify the tools and languages, five realization levels were developed: Physical modeling models Constraint models Continuous causal models Discretized models Discretized models with solver and platform implementation By using these realization levels, models, tools and modeling languages can be classified, and transformations between them can be set up and analyzed. As a result, a method to describe the simulation behavior of a MATLAB/Simulink model has been developed using SysML activity diagrams as an approach to achieve integrated system models. Another result is an evaluation of the parametric diagrams of SysML for continuous-time modeling, which shows that they do not enable “physical modeling”, i.e. modeling the topology of the system and getting the underlying equations out of this topology. By including physical ports and physical connectors to SysML internal block diagrams, this could be solved. The comparison also shows many similarities between the languages. The results led to a more detailed investigation on conjugate variables, such as force and velocity, and electric current and voltage, and how these are treated in various languages. The thesis also includes two industrial case studies: one of a twin-screw compressor, and one of a simulation environment for automotive fuel-cell systems. Conclusions are drawn from these models, referring to the realization levels.QC 20100810
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Tontodonati, Vera. « Gestione termica di pacchi batteria per autobus elettrici ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
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L’inquinamento atmosferico è uno dei problemi più dibattuto negli ultimi anni, perciò aumentano sempre più le strategie politiche atte a finanziare la ricerca e lo sviluppo di tecnologie che contengano le emissioni di inquinanti in atmosfera. Lo sviluppo di veicoli elettrici è uno dei principali protagonisti, interessando anche il Trasporto Pubblico Locale.
Per favorirne la diffusione, è fondamentale ridurre il costo della batteria elettrica: occorre produrre batterie in grado di avere una vita lunga, di essere utilizzate in applicazioni di second life al termine della loro prima vita utile e prevedere un processo di montaggio quanto più semplice ed automatizzato possibile. Inoltre è necessario corredare il pacco batterie di un opportuno Battery Thermal Management System, poiché le sue prestazioni ed il suo State Of Health sono estremamente influenzate dalla temperatura.
L’oggetto del lavoro di tesi è la modellazione di un pacco batterie destinato all’alimentazione di un autobus elettrico prodotto da Industria Italiana Autobus. Il pacco batterie è figlio del progetto LiBER (Lithium Battery Emilia Romagna), in collaborazione con l’Università di Bologna, che prevede un innovativo sistema di assemblaggio automatico.
Il modello del pacco batteria e del carico termico è stato realizzato avvalendosi del software Simulink. Il modello è stato completato con il BTMS e le logiche di funzionamento che regolano l'unità di controllo.
Sono state effettuate diverse simulazioni, per prevedere il comportamento termico della batteria dell’autobus sottoposto a differenti carichi termici e condizioni ambientali. Il modello è estremamente adattabile: è sufficiente inserire il profilo di velocità del ciclo guida e pochi altri dati per poter simulare una grande varietà di situazioni.
Il modello dovrà in futuro essere validato, poiché al momento tali batterie elettriche non sono entrate in produzione poichè ancora oggetto di ricerca.
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Ekman, Svahn Edvin Benjamin. « Kontrollsystem till Markberedare : Styrning till Invers-Markberedare ». Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80980.
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Syftet med detta examinationsarbete är att utveckla ett kontrollsystem för en inversmarkberedningsprototyp.En simuleringsmodell har skapats för att utveckla ett kontrollsystem med syftet att validera och verifiera prototypens effektivitet. Simuleringsuppställningen är skapad i Simulink, där en del av prototypen är importerad som en solidmodell vilken sammankopplas med en modell av ett hydraulsystem som styr solidmodellens rörelse. I Simuleringsmiljön utvecklades reglering samt styrlogik för prototypen. När regleringen var färdig att testas kontrollerades det att mjukvaran läsa av aktuella sensorer och att utsignaler från kontrollsystemet når hårdvaran, samt att den avsedda rörelsen utförs i verkligheten. Detta projekt har därmed resulterat i en simuleringsmodell, ett kontrollsystem, samt förutsättningar för att kunna verifiera resultaten i verkligheten.This thesis treats the development of a control system for an inverse soil conditioner prototype. A simulation model was created to develop a control system with the purpose of validation and verification of the prototypes efficacy. The simulation model is created in Simulink, where a part of the soil conditioner is imported as a solid model, which then is coupled to a model of a hydraulic system. In the simulation a control system and regulator were implemented and tuned. when the software was test-ready the hardware-interface was tested to validate that the current software could receive inputs and send meaningful outputs, and then real movements were logged to validate the software function for the machine. The results of this project can then be summarized as a simulation model, a control system, and a solid basis for real world verification are completed.
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Pellegatti, Samuele. « Motorized system for opening and closing a domestic dishwasher ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18651/.
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Study and prototyping of a motorized domestic dishwasher for opening and closing the door automatically. Work is split in 3 parts: mechanic, electronic, software.
Mechanic deals with hinge kinematic analysis, concept development, simulation analysis, components sizing and construction.
Electronic refers to components research, setup and displacement on the dishwasher.
Software regards Arduino Mega (the used MCU) state programming.
This thesis contains also intermediate trials with encoutered troubles and show how they've been solved.
Many future implementations are finally presented.
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Khammassi, Montassar. « Optimisation d’un système poly-articulé imparfait : méthode numérique multi-physique d’aide à la convergence sur le design d’une vanne multivoie ». Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLV027/document.
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La maîtrise de la gestion thermique du moteur à combustion interne permet de répondre à des problématiques telles que la réduction de la consommation de carburant et des émissions de polluants. Cette gestion peut être réalisée par des systèmes mécatroniques, plus précisément grâce à une vanne électromécanique multivoie, appelée ACT valve (Active Cooling thermo-management valve), permettant de mettre en œuvre une stratégie de gestion thermique lors du contrôle des températures dans différentes branches du circuit de refroidissement du moteur thermique.L’objectif du travail est d’améliorer la robustesse du processus de conception de cette vanne en tenant compte des contraintes fonctionnelles multi-physiques telles que la déformation, l’usure, mais aussi de contraintes de fabrication et de tolérancement géométrique liées au processus d’injection des pièces thermoplastiques. Ces incertitudes doivent être prises en compte dès la phase de la conception pour assurer l'efficacité et la fiabilité de ces vannes jusqu'à la fin de leurs vies.Ces travaux de thèses proposent tout d’abord une nouvelle méthode de conception de ces vannes qui se base sur des modèles numériques multi-physiques permettant à tous les métiers d’avoir une base de données commune. Validés expérimentalement, Ces modèles ont permis de mettre en évidence la sensibilité de certains paramètres géométriques sur le couple développé par l’actionneur de la vanne et de s’assurer de la fiabilité du système par la prédiction de l’usure sur un des éléments clés de l’ACT valve.Bien que l’analyse de sensibilité nous ait permis de comprendre l’influence de certains paramètres sur le système, nous avons proposé une nouvelle technique d’identification des configurations optimales du design de cette vanne en utilisant une méthode d’optimisation méta-heuristique multi-objectifs. Les suggestions de conception offertes par cette méthode permettent de réduire le couple résistant sur l’actionneur de la vanne ainsi que l’encombrement global du systèmeThe thermal management of the internal combustion engine can solve issues related to fuel consumption reduction and pollutant emissions. This management can be applied using mechatronic systems, more precisely thanks to a multi-way electromechanical valve, called ACT valve (Active Cooling thermo-management valve), that presents a thermal management strategy when controlling temperatures in different branches of the engine cooling circuit.The aim of this work is to improve the robustness of the design process of this valve taking into account the multi-physical functional constraints such as deformation, wear, but also geometrical tolerances constraints related to the thermoplastic parts manufacturing process. These uncertainties must be taken into account in the first steps of the design phase to ensure the effectiveness and reliability of this valve over its lifetime.This work first proposes a new method of designing these valves, which is based on multi-physical modeling, allowing the product designers to have a common database. Experimentally validated, these models made it possible to highlight the sensitivity of certain geometrical parameters on the torque developed by the actuator of the valve and to make sure of the reliability of the system with wear prediction on one of the key elements of ACT valve.Although the sensitivity analysis allowed us to understand the influence of certain parameters on the system, we proposed a new technique for identifying optimal configuration configurations of this valve using a metaheuristic, multi-objective optimization method. The design suggestions offered by this method can reduce the resistive torque on the valve DC-actuator as well as the overall packaging
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Dambrosio, Antonello. « Design and development of a quarter car test rig ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12221/.
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Il presente lavoro di tesi ha come obiettivo la progettazione di un banco prova per un quarto di veicolo e la realizzazione di un generatore di segnale in grado di inviare segnali di ingresso ad un attuatore idraulico il quale sarà utilizzato per eccitare la ruota in modo da simulare il profilo stradale. La fase di progettazione è stata svolta utilizzando il software Solidworks. In seguito sono state eseguite simulazioni per l’analisi strutturale e di frequenza di alcune parti del banco tramite l’utilizzo del software Ansys. Terminata la fase di progetto, il modello Solidworks è stato importato in ambiente Simulink utilizzando i blocchi di modellazione della piattaforma Simscape/SimMechanics, in modo da effettuare un'analisi dinamica del modello. L’ultima parte dello studio riguarda la realizzazione di un generatore di segnale in grado di ricevere il segnale di feedback proveniente dal servo controller dell’attuatore. Il generatore è stato realizzato utilizzando il micro controllore Arduino Uno. Tale dispositivo, grazie alle sue potenzialità, ha permesso la generazione di un segnale sinusoidale a diverse ampiezza e frequenze in modo da coprirne un certo campo di valori in base alla richiesta. Inoltre tale sistema è in grado di ricevere il segnale di feedback dal servo controller dello shaker in modo tale da leggerne il valore e monitorarlo in tempo reale sul PC.
I risultati di questo studio mostrano che il Quarter car test rig progettato è una piattaforma in grado di studiare il comportamento dinamico dei sistemi sospensivi, la cui struttura si rende capace di poter testare diverse tipologie di sospensioni e pesi di veicolo, rappresentando un solido punto di partenza per una futura realizzazione fisica del banco.
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Chowdhury, Md Abu Raihan. « Pre-feasibility study of V2G system in the micro-grid of St. Martine Island, Bangladesh ». Thesis, Uppsala universitet, Elektricitetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-409575.
Texte intégralRésumé :
The goal of the study was to evaluate the potential of the V2G system as a solution to peak load leveling and integrating more renewable energy in the microgrid of St. Martine Island. Simulink Simscape software was used to model a microgrid with a V2G system for the small community of the Island. The result of the study shows a V2G system with 100 electric cars could play an important role for peak shaving by supplying up to 0.8 MW of electric power back to the grid during peak hours, where each car contributes 10 kW of electric power. It also demonstrates that the V2G system effectively helps to promote solar power capacity from 1 MW to 2.5 MW, hence increase 23.59% share of solar energy in the total grid energy uses compared with the current microgrid of St. Martine Island.The electricity that is generated from non-renewable sources causesenvironmental pollution and climate changes. Fossil fuel uses leads to thedepletion of fossil fuel resources as well as global warming. On the other hand, renewable energy sources can be used to produce electricity with very few or no CO2 emissions. So, now governments are focusing on renewable energy production. But solar, wind, and other types of renewable energy sources have intermittency. They are not continuously available due to natural factors that cannot be controlled. So, renewable energy needs to be utilized when it is available, or its intermittency can be overcome by energy storage. All Electric vehicle uses a battery pack of large capacity to power the electric motors. These batteries can be used to store the energy that is generated from renewable sources and use them when needed. Besides, the electric grid must always stay in balance. With the development of variable renewable energy production, the management of this balance has become complex. Vehicle to grid is a technology that enables energy to be pushed back to the grid from the battery of an electric car and helps to manage fluctuations on the electricity grid. It helps to balance the grid by charging the battery when renewableenergy is available and load demand is low, then sending energy back to the grid when load demand is high. However, St. Martine Island is a small Island in Bay of Bengal about 9km south of the mainland of Bangladesh. Nearly 6000 people are living there. Since the island is far away from the mainland, grid connection is almostimpossible in terms of cost and geographic location. St. Martine Island has a very high solar power potential, but very low average wind speed. Currently, the electricity demand is fulfilled by stand-alone diesel generators, PV panels, and wind turbines. The current microgrid gets a high load demand during peak hours which is between 6 pm to 11 pm. During this time grid become fully dependent on diesel generators which leads to fossil fuel uses andenvironmental pollution. Here, the project's key objective is to determine the prospects of V2Gtechnology on St. Martine Island to level the peak load during peak hours, given that St. Martine Island is a low windy island with a high average number of yearly peak sun hours. Another goal is to examine the degree to which the share of solar power can be increased by a V2G system in St. Martine Island. In the project, at first, we have modeled a microgrid using Simulink Simscape software. Simulink Simscape enables modeling of a system by putting direct physical connections between the block diagram. In the microgrid model, there are five main sections, which have been designed by assemblingfundamental components in the schematic. A V2G system has been modeled which consists of 100 electric cars as aprototype. Each car has a battery of 100 kWh capacity. Considering thecondition of St. Martine Island and the objective of the project, we have made some assumptions while modeling the V2G section. The results of the project showed that the V2G system significantly smoothed out the peak load during peak hours. It also demonstrated that charging electric cars during daytime by solar power and sending energy back to the grid during peak hours enables the V2G system to accommodate more renewable solar energy sources in the microgrid of St. Martine Island. Finally, the project evident that the V2G system can be integrated into the microgrid of St. Martine Island to level the peak load and to increase the share of solar energy in the total energy uses of the Island.
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Janák, Luděk. « MEMS termoelektrický generátor v letecké aplikaci ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231199.
Texte intégralRésumé :
Tato diplomová práce se zabývá vývojem autonomního zdroje elektrické energie založeného na MEMS termoelektrickém generátoru. Uvažovaný generátor bude následně použit pro napájení autonomní senzorické jednotky pro letecké aplikace. Systémový pohled na autonomní senzorickou jednotku zahrnuje senzor se zpracováním a přenosem dat, energy harvester (termoelektrický generátor), power management, akumulační prvek a autodiagnostiku. Všechny výše uvedené komponenty jsou v práci podrobně popsány. V úvodu práce je provedena široká rešerše existujících termoelektrických generátorů pro letecké aplikace. Následně jsou popsány základní teoretické poznatky z oblasti DC/DC měničů pro energy harvesting. Zvláštní pozornost je věnována metodám MPPT (Maximum Power Point Tracking). Jako základ pro vývoj napájení autonomní senzorické jednotky bylo provedeno množství simulací za pomoci nástroje MATLAB/Simulink Simscape. Pro identifikaci prametrů modelu posloužilo měření na speciálním přípravku. Praktická implementace teoreticky popsaných problémů je provedena na k tomuto účelu navrženém technologickém demonstrátoru. Závěrem je zhodnocena reálná využitelnost navržené technologie pro finální aplikaci v leteckém průmyslu.
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Taylor, Charles. « MODERNIZATION OF THE MOCK CIRCULATORY LOOP : ADVANCED PHYSICAL MODELING, HIGH PERFORMANCE HARDWARE, AND INCORPORATION OF ANATOMICAL MODELS ». VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/493.
Texte intégralRésumé :
A systemic mock circulatory loop plays a pivotal role as the in vitro assessment tool for left heart medical devices. The standard design employed by many research groups dates to the early 1970's, and lacks the acuity needed for the advanced device designs currently being explored. The necessity to update the architecture of this in vitro tool has become apparent as the historical design fails to deliver the performance needed to simulate conditions and events that have been clinically identified as challenges for future device designs. In order to appropriately deliver the testing solution needed, a comprehensive evaluation of the functionality demanded must be understood. The resulting system is a fully automated systemic mock circulatory loop, inclusive of anatomical geometries at critical flow sections, and accompanying software tools to execute precise investigations of cardiac device performance. Delivering this complete testing solution will be achieved through three research aims: (1) Utilization of advanced physical modeling tools to develop a high fidelity computational model of the in vitro system. This model will enable control design of the logic that will govern the in vitro actuators, allow experimental settings to be evaluated prior to execution in the mock circulatory loop, and determination of system settings that replicate clinical patient data. (2) Deployment of a fully automated mock circulatory loop that allows for runtime control of all the settings needed to appropriately construct the conditions of interest. It is essential that the system is able to change set point on the fly; simulation of cardiovascular dynamics and event sequences require this functionality. The robustness of an automated system with incorporated closed loop control logic yields a mock circulatory loop with excellent reproducibility, which is essential for effective device evaluation. (3) Incorporating anatomical geometry at the critical device interfaces; ascending aorta and left atrium. These anatomies represent complex shapes; the flows present in these sections are complex and greatly affect device performance. Increasing the fidelity of the local flow fields at these interfaces delivers a more accurate representation of the device performance in vivo.
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Junek, Jiří. « Modelování dynamiky části tiskařského stroje ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-240941.
Texte intégralRésumé :
This thesis deals with modeling dynamics of printing machine, made by SOMA Engineering, in toolbox SimScape of simulation program Simulink/Matlab. There are descibed properties, progress, important principles and laws of modeling in this toolbox. The first part is focused on creating models, which consist as mechanical as eletrical and control parts. In the second part is explained how to create user interface to control models and creating standalone application, executable without installation of Matlab or Simulink. In last part is explained principle of identification parameters of material from the measured data, using an optimalization algorithm Nelder-Mead. Created models and identification algorithm are controlled via user interface.
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Joshi, Shital. « Analysis and Optimization of Graphene FET based Nanoelectronic Integrated Circuits ». Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849755/.
Texte intégralRésumé :
Like cell to the human body, transistors are the basic building blocks of any electronics circuits. Silicon has been the industries obvious choice for making transistors. Transistors with large size occupy large chip area, consume lots of power and the number of functionalities will be limited due to area constraints. Thus to make the devices smaller, smarter and faster, the transistors are aggressively scaled down in each generation. Moore's law states that the transistors count in any electronic circuits doubles every 18 months. Following this Moore's law, the transistor has already been scaled down to 14 nm. However there are limitations to how much further these transistors can be scaled down. Particularly below 10 nm, these silicon based transistors hit the fundamental limits like loss of gate control, high leakage and various other short channel effects. Thus it is not possible to favor the silicon transistors for future electronics applications. As a result, the research has shifted to new device concepts and device materials alternative to silicon.
Carbon is the next abundant element found in the Earth and one of such carbon based nanomaterial is graphene. Graphene when extracted from Graphite, the same material used as the lid in pencil, have a tremendous potential to take future electronics devices to new heights in terms of size, cost and efficiency. Thus after its first experimental discovery of graphene in 2004, graphene has been the leading research area for both academics as well as industries. This dissertation is focused on the analysis and optimization of graphene based circuits for future electronics.
The first part of this dissertation considers graphene based transistors for analog/radio frequency (RF) circuits. In this section, a dual gate Graphene Field Effect Transistor (GFET) is considered to build the case study circuits like voltage controlled oscillator (VCO) and low noise amplifier (LNA). The behavioral model of the transistor is modeled in different tools: well accepted EDA (electronic design automation) and a non-EDA based tool i.e. \simscape. This section of the dissertation addresses the application of non-EDA based concepts for the analysis of new device concepts, taking LC-VCO and LNA as a case study circuits. The non-EDA based approach is very handy for a new device material when the concept is not matured and the model files are not readily available from the fab. The results matches very well with that of the EDA tools. The second part of the section considers application of multiswarm optimization (MSO) in an EDA tool to explore the design space for the design of LC-VCO. The VCO provides an oscillation frequency at 2.85 GHz, with phase noise of less than -80 dBc/Hz and power dissipation less than 16 mW. The second part of this dissertation considers graphene nanotube field effect transistors (GNRFET) for the application of digital domain. As a case study, static random access memory (SRAM) hs been design and the results shows a very promising future for GNRFET based SRAM as compared to silicon based transistor SRAM. The power comparison between the two shows that GNRFET based SRAM are 93% more power efficient than the silicon transistor based SRAM at 45 nm.
In summary, the dissertation is to expected to aid the state of the art in following ways:
1) A non-EDA based tool has been used to characterize the device and measure the circuit performance. The results well matches to that obtained from the EDA tools. This tool becomes very handy for new device concepts when the simulation needs to be fast and accuracy can be tradeoff with.
2)Since an analog domain lacks well-design design paradigm, as compared to digital domain, this dissertation considers case study circuits to design the circuits and apply optimization.
3) Performance comparison of GNRFET based SRAM to the conventional silicon based SRAM shows that with maturation of the fabrication technology, graphene can be very useful for digital circuits as well.
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Santo, Luca. « AA-CAES physical modelling : integration of a 1D TES code and plant performance analysis ». Thesis, Uppsala universitet, Tillämpad kärnfysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-360448.
Texte intégralRésumé :
The focus of this thesis work was the development of an approachto couple a previosly existing Thermal Energy Storage (TES) modelwritten in C++ with a Simulink/Simscape plant model to simulate anAdvanced Adiabatic Compressed Air Energy Storage (AA-CAES) plant.After the creation and validation of such tool, the complete modelwas used to run simulations, with the aim of assessing the AA-CAESplant's performance under multiple patterns of charge anddischarge.Most of the works found in the literature only provide values ofstorage efficiency obtained from analytical approaches, whilethose that use simulation tools provide average values ofefficiencies when the plant is performing a series of identicalcycles of charge and discharge. During this thesis project,instead, simulations were performed for consecutive irregularcycles determined as the plant response to the electric grid powerrequest. The average efficiency values obtained provide thereforea better representation of how the plant would perform in realapplications.The results show that, under the assumptions made, the AA-CAESplant's overall storage efficiency is influenced very weakly byalterations of the charge-discharge patterns, and that goodperformances can be expected not only for identical chargedischargeconsucutive cycles, but for any pattern that observesthe cavern pressure limits, as long as the thermal energy storageis sized wisely.In addition, a sensitivity analysis was performed in order toassess the influence of turbomachinery efficiency on overallstorage efficiency, for a specified plant layout. The results showthat the turbine efficiency is the most affecting parameter to theplant's performance, while the impact of the main compressors'sinefficiency is mitigated by the thermal recovery that takes placein the TES.The present work confirms that AA-CAES is a promising technologyand that storage efficiencies above 70% can be achieved even inrealistic production scenarios.Finally, future steps for more accurate simulations of plants'performances and more detailed energy production scenarios areproposed.MSc ET 18007Examinator: Joakim WidénÄmnesgranskare: Ane HåkanssonHandledare:
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Mukka, Manoj Kumar. « Simulink® Based Design and Implementation of a Solar Power Based Mobile Charger ». Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849640/.
Texte intégralRésumé :
Electrical energy is used at approximately the rate of 15 Terawatts world-wide. Generating this much energy has become a primary concern for all nations. There are many ways of generating energy among which the most commonly used are non-renewable and will extinct much sooner than expected. Very active research is going on both to increase the use of renewable energy sources and to use the available energy with more efficiency. Among these sources, solar energy is being considered as the most abundant and has received high attention. The mobile phone has become one of the basic needs of modern life, with almost every human being having one.Individually a mobile phone consumes little power but collectively this becomes very large. This consideration motivated the research undertaken in this masters thesis.
The objective of this thesis is to design a model for solar power based charging circuits for mobile phone using Simulink(R). This thesis explains a design procedure of solar power based mobile charger circuit using Simulink(R) which includes the models for the photo-voltaic array, maximum power point tracker, pulse width modulator, DC-DC converter and a battery. The first part of the thesis concentrates on electron level behavior of a solar cell, its structure and its electrical model.The second part is to design an array of solar cells to generate the desired output. Finally, the third part is to design a DC-DC converter which can stabilize and provide the required input to the battery with the help of the maximum power point tracker and pulse width modulation. The obtained DC-DC converter is adjustable to meet the requirements of the battery. This design is aimed at charging a lithium ion battery with nominal voltage of 3.7 V, which can be taken as baseline to charge different types of batteries with different nominal voltages.
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Husain, Muhammad Dawood. « Development of temperature sensing fabric ». Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/development-of-temperature-sensing-fabric(0e5e8367-c3b2-4cff-bcc9-f32fac97b50f).html.
Texte intégralRésumé :
Human body temperature is an important indicator of physical performance and condition in terms of comfort, heat or cold stress. The aim of this research was to develop Temperature Sensing Fabric (TSF) for continuous temperature measurement in healthcare applications. The study covers the development and manufacture of TSF by embedding fine metallic wire into the structure of textile material using a commercial computerised knitting machine. The operational principle of TSF is based on the inherent propensity of a metal wire to respond to changes in temperature with variation in its electrical resistance. Over 60 TSF samples were developed with combinations of different sensing elements, two inlay densities and highly textured polyester yarn as the base material. TSF samples were created using either bare or insulated wires with a range of diameters from 50 to 150 μm and metal wires of nickel, copper, tungsten, and nickel coated copper. In order to investigate the Temperature-Resistance (T-R) relationship of TSF samples for calibration purposes, a customised test rig was developed and monitoring software was created in the LabVIEW environment, to record the temperature and resistance signals simultaneously. TSF samples were tested in various thermal environments, under laboratory conditions and in practical wear trials, to analyse the relationship between the temperature and resistance of the sensing fabric and to develop base line specifications such as sensitivity, resistance ratio, precision, nominal resistance, and response time; the influence of external parameters such as humidity and strain were also monitored. The regression uncertainty was found to be less than in ±0.1°C; the repeatability uncertainty was found to be less than ±0.5°C; the manufacturing uncertainty in terms of nominal resistance was found to be ± 2% from its mean. The experimental T-R relationship of TSF was validated by modelling in the thermo-electrical domain in both steady and transient states. A maximum error of 0.2°C was found between the experimental and modelled T-R relationships. TSF samples made with bare wire sensing elements showed slight variations in their resistance during strain tests, however, samples made with insulated sensing elements did not demonstrate any detectable strain-dependent-resistance error. The overall thermal response of TSF was found to be affected by basal fabric thickness and mass; the effect of RH was not found to be significant. TSF samples with higher-resistance sensing elements performed better than lower-resistance types. Furthermore, TSF samples made using insulated wire were more straightforward to manufacture because of their increased tensile strength and exhibited better sensing performance than samples made with bare wire. In all the human body wear trials, under steady-state and dynamic conditions both sensors followed the same trends and exhibited similar movement artifacts. When layers of clothing were worn over the sensors, the difference between the response of the TSF and a high-precision reference temperature were reduced by the improved isothermal conditions near the measurement site.
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Loup, Martin. « Modely stejnosměrných tranzistorových měničů v programu Simulink ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-412975.
Texte intégralRésumé :
The master’s thesis is focused on the creation of models of DC/DC converters and control program for input parameters and their configuration. The first part is theoretical and she is dedicated to the description of the program Matlab. The second chapter is dedicated to DC/DC converters. Their function is described there and the necessary equations for the design are derived. All of this is complemented by the calculation of line losses in semiconductor elements and the design of voltage and current regulator. The last two parts deal with the description of the created models in Simulink and control program in a graphical environment. The created program is able to edit and recalculate parameters of the converters, calculate line losses on semiconductor components, perform a model simulation or open it.
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SANGA, BHARAT. « SOME STUDIES ON ULTRASONIC JOINING OF THIN COPPER, ALUMINIUM AND PHOSPHOR BRONZE SHEETS ». Thesis, 2022. http://dspace.dtu.ac.in:8080/jspui/handle/repository/19725.
Texte intégralRésumé :
The quest to produce cost-effective, efficient, and ergonomically designed products demands
the use of assemblies fabricated with assorted materials. Because of the differences in their
physical, chemical, and metallurgical properties, joining dissimilar metals has been a difficult
task for the researchers. Ultrasonic metal welding has overcome some of these limitations due
to its unique characteristics. A number of diversified applications, ranging from small
components used in the electronics industry to aerospace and solar, are being fabricated by
Ultrasonic Spot Metal Welding (USMW). USMW uses vibrational energy to produce heat at
the interface of the faying surfaces. The sheets are subjected to combined normal and shear
loading with the help of sonotrode assembly. These combined loads disperse the oxides and
contaminants as well as remove the surface asperities so as to form pure metallic bonds in
cold conditions without filler metal, flux, or shielding gas. It’s an efficient, green process that
takes very little processing time. Since USMW is designed to join dissimilar metals/materials,
this study used both similar and dissimilar combinations of phosphor bronze (UNS C51100),
copper (UNS C10300), and aluminum (Al 3003).
It was observed through the available literature that there is a need for the optimization of the
process parameters along with the characterization of the weld joint in the case of USMW.
With these goals in mind, experiments were carried out in both 'Time Control Mode' and
'Energy Control Mode' using different experimental designs. The Analysis of Variance
(ANOVA) is utilized on the response parameters-tensile shear load and the weld area. Weld
pressure is observed as the most significant parameter, followed by weld time, and vibration
amplitude, in affecting the weld strength. A reasonably good correlation is observed between
the tensile shear load and the weld area between all the combinations of the weld metals. The
process parameters are optimized by coupling the regression model as a fitness function with
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the simulated annealing optimization algorithm. Finally, the confirmatory experimental
results substantiated the predicted results and validated the proposed methodology.
The modeling and simulation of the USMW process is carried out using FEM. The model is
utilized for the study and prediction of the thermal profiles at the weld interface. The heat
fluxes generated due to deformation and friction are calculated and assigned as boundary
conditions during thermal simulation. The forecast of temperature is done under various
welding conditions. The maximum temperature obtained by transient simulation at the weld
interface is 368.8℃, 369.4℃ and 296.1℃ for PB-PB, PB-Cu, and PB-Al, respectively. The
continuous reduction in the temperature is observed towards the extremes of the weld metal.
The sonotrode and the anvil achieve a lower temperature in comparison to the weld interface.
The effect of clamping force and bonding ratio on the interface temperature is observed to be
positive. The weld interface is distinguished as the weld zone, TMAZ and HAZ. The model is
validated with the maximum absolute errors within 5% for PB-PB joints, 6.26% for PB-Cu
joints, and 5.68% for PB-Al joints between the observed and predicted temperature results. A
correlation coefficient of 0.96, 0.87, and 0.86 is established between the simulated
temperature result and the weld strength for PB-PB, PB-Cu, and PB-Al, respectively. Thus, it
is clear that the interface temperature has a strong linear relationship with joint strength and is
a major deciding factor for achieving strong joints.
The effect of the weld energy on interface temperature and weld strength is also explored. It
is observed that the values of peak interface temperature and tensile-shear strength increase
with the welding energy. The failure mode changes from interfacial to nugget pull-out at a
considerably high energy level during the tensile-shear load test. There is a significant rise in
the tensile-shear load initially, but a negligible change is observed in the last stage. The
scanning electron microscopy (SEM) revealed that the joining line appears almost straight at
a low energy level but fades away at a higher energy level. The bonding region ultimately
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acquires the shape of a wavy, convoluted interface. Micro-bonding accompanied by
interlocking is observed as the primary joining mechanism at high energy level. Hence, it can
be concluded that joint strength in USMW was the combined result of the formation of
micro-bonds and mechanical interlocking due to the swirling of metal at the interface.
The observations and the results of the current study reflect that different combinations of
PB, Cu, and Al give very good responses to the ultrasonic spot metal welding in the given
ranges of the parameters. Hence, this joining technique can be effectively used for the
fabrication of thin components made of these metals. This study can provide useful inputs for
the industries involved in the manufacturing of battery electrical vehicles, solar panels, small
electrical and electronic products like relays, contacts, and heat sinks etc.
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Bregaw, Mohamed Abdussalam. « Modeling, Simulation and Optimization of Residential and Commercial Energy Systems ». 2013. http://hdl.handle.net/10222/36255.
Texte intégralRésumé :
A Residential Energy Management System (REMS) in smart grid provides capability to manage a daily load curve in order to reduce power consumption and energy cost. Consequently, (REMS) offers significant benefits for both the electricity suppliers and consumers in terms of control and schedule time of use of major appliances.
In recent years, however, the rate of energy demand has increased rapidly throughout the world while the price of energy has been fluctuating. Numerous methods for (REMS) are used; this thesis analyzes many candidate scenarios during peak load periods comparing to the tariff to reduce the usage and its associated costs. It presents simulated results of proposed (REMS) to provide an automated least cost demand response. The main approach will be to ensure the satisfaction of the requirements with constraints on efficient use of energy. Multiphasic system behaviors of smart appliances in (REMS) with a realistic manner are proposed.This thesis examines many mathematical models of home appliances in order to calculate the physical quantities that reflect the parameters’ impact and the system behavior. Main contribution determines the optimal solution of (TOU) problem to reduce energy cost and determine the best operation time by using (Linear optimization technique).
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Βγενόπουλος, Ανδρέας. « Μελέτη και ανάλυση ψηφιακού ενισχυτή ». Thesis, 2013. http://hdl.handle.net/10889/7510.
Texte intégralRésumé :
Η ψηφιακή τεχνολογία έχει διεισδύσει πλήρως στην περιοχή της Ακουστικής και της Τεχνολογίας
Ήχου, όπως επίσης και σε όλους σχεδόν τους κλάδους της σύγχρονης επιστήμης και της τεχνολογίας.
Στον τομέα των ηλεκτρονικών για ηχητικές εφαρμογές, ιδιαίτερα καθοριστικό ρόλο κατέχουν οι ενι-
σχυτές. Σκοπός της εργασίας αυτής, είναι να παρουσιάσει το λειτουργικό μοντέλο ενός ψηφιακού ενι-
σχυτή Class-D για ηχητικά σήματα, το οποίο προσομοιώθηκε και λειτούργησε σε περιβάλλον Matlab
& Simulink. Στο τέλος παρουσιάζονται τα αποτελέσματα χρήσιμων μετρήσεων για σημαντικούς δεί-
κτες της ηλεκτροακουστικής όπως η Απόκριση Συχνότητας, Total Harmonic Distortion(THD), Total
Harmonic Distortion plus Noise (THD+N) ως προς τη συχνότητα και ως προς την ισχύ, από όπου
βγαίνουν συμπεράσματα σχετικά με την ποιότητα και την απόδοση της συγκεκριμένης τεχνολογίας
υλοποίησης.DigitalTechnology has been fully into Acousctics and Audio Technology,as in virtually all branches of modern science and technology.In audio electronics applications, amplifiers have a significant role. The purpose of this thesis is to present the functional model of a digital Class-D amplifier for audio signals, which has been simulated and run in Matlab & Simulink environment. Finally the results of measurements relating to some important electroacoustics indexes like Frequency Response, Total Harmonic Distortion (THD), Total Harmonic Distortion plus Noise (THD+N), relative to the audio signal’s frequency and power, are presented and lead to some conclusions concerning the quality and efficiency of this implementation technology.