Theses (Department of Mechanical Engineering)

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Theses collection of the Faculty of Engineering.

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  • TételKorlátozottan hozzáférhető
    Development of energy-efficient fans for ventilation of data centers
    Pernabekov, Azamat; Szodrai, Ferenc; DE--Műszaki Kar
    The study is devoted to the current issue of developing energy-efficient fans specifically designed to ensure efficient ventilation in data centers. The first task carefully analyzes and selects the most optimal fan type to meet the stringent cooling requirements of a data center. The main attention is paid to the development of an energy-efficient axial fan model and its successful integration into a computer-aided design system. Subtopics in this section include ventilation system concept, axial fan design, and efficient fan control techniques such as impeller speed control and innovative blade adjustment techniques. An important step is the design of the blades of an energy efficient axial fan, including the influence of the shape of the blade axis on the economical operation of the fan, the selection of the blade profile and the creation of the final 3D model using Solid Edge software. Next, an aerodynamic calculation of the developed fan is carried out, including splitting into a finite element mesh, setting the air flow conditions and calculating the flow rate, followed by analysis of the results. The final task of the work are devoted to assessing the performance and estimating the cost of an energy-efficient axial fan. Evaluating performance includes improving the design, using innovative control technologies and selecting the optimal material. The study ends with the calculation of the payback period, providing an integrated approach to development and a comprehensive assessment of the performance of this important component of the data center ventilation system.
  • TételKorlátozottan hozzáférhető
    3D scanning and manufacturing design of an engine piston
    Ni, Gaoyuan; Bodzás, Sándor; DE--Műszaki Kar
    The main objective of this thesis consists of developing a three-dimensional (3D) model of a piston head using Computer Aided Design (CAD) software. Although AutoCAD software is primarily focused on two-dimensional (2D) applications, it was chosen for this thesis because of its ability to generate 3D models as well. After completing the 3D model using the computer-aided design (CAD) software, I traveled to the lab and utilized the 3D scanning equipment to capture the physical piston head. I then performed a comparative analysis of the aforementioned 3D model and the scan results with the aim of identifying any potential discrepancies or inaccuracies. This stage was completed with the help of Mr. Dániel Nemes, who provided invaluable assistance throughout the process. Initial comparisons showed significant differences between the produced and scanned 3D models. Therefore, I optimized the accuracy of the piston head 3D model by optimizing it. Subsequent analysis showed that the error of the improved model was below an acceptable threshold. The third objective of this thesis was to develop a machining process for the piston head using EdgeCAM software. Proficiency in milling and turning machining techniques was achieved by exploring the relevant PDF learning resources available on the official EdgeCAM website and by utilizing instructional videos available on the Internet. During the initial design phase, I realized that the unique composition of the piston head did not allow for the use of only milling or turning methods in the machining process. Therefore, it was decided to use Solidworks software to divide the 3D model of the piston head into different parts. The upper portion of the piston head was manufactured utilizing turning machining techniques. The upper part of the piston head is manufactured by the turning machining process while the lower part of the piston head is manufactured by milling machining process. At the initial stage of the design process, it is vital to determine the appropriate blank for the machined object. Subsequently, fixtures and machine tools must be set up accordingly. The EdgeCAM 3D model is then utilized to determine the specific features to be machined. Finally, the machining design is carried out, including determining the relevant cutting tools, the type of machining (e.g. rough turning, rough grooving, finish grooving) and the specific type of machining based on the feature to be machined. In turning, different operations such as rough turning, rough grooving, finish turning, finish grooving, and cut-off require the adjustment of specific parameters for each operation. Similarly, milling encompasses a variety of machining techniques, including roughing, contour milling, and face milling. The final goal was to optimize the machining process design. I successfully optimized the milling process for the lower part of the piston head on two occasions, reducing the machining time from 51 minutes to 13 minutes the first time and 9 minutes the second time.
  • TételKorlátozottan hozzáférhető
    Investigation of Design Factors of Drive Systems for Hydraulic Pumps
    Ashraf, Usman; Hajdu, Sándor; DE--Műszaki Kar
    This thesis, titled "Investigation of Design Factors of Drive Systems for Hydraulic Pumps," systematically addresses critical aspects influencing hydraulic pump system functionality and design. The study focuses on four main objectives. Firstly, it comprehensively examines the fundamental components and design features of hydraulic pumps, laying a crucial foundation for subsequent analysis. Next, precise calculations determine the optimal drive system, emphasizing compatibility, efficiency, and reliability. The research progresses to creating a detailed Computer-Aided Design (CAD) model, enhancing spatial understanding and serving as a platform for further optimization. The final objective emphasizes constructing the pump system's base frame, involving meticulous analysis of material, structure, and alignment for longevity and suitability. The insights gained contribute to advancing hydraulic technology, ultimately enhancing fluid power systems' effectiveness and durability.
  • TételKorlátozottan hozzáférhető
    Hőre lágyuló kompozit féknyereg végeselemes modellezése multiscale anyagmodell segítségével
    File, Máté; Huri, Dávid; DE--Műszaki Kar
    A dolgozatom során egy termoplasztikus kompozitból készült féknyereg végeselemes modellezését végeztem el, melyet az osztrák Johannes Kepler Universität Linz, Institute of Polymer Product Engineering (JKU IPPE) intézettel közösen dolgoztam ki. A modellezési feladat elvégzéséhez egy anyagi szintű visszafejtő tervezési eljárást dolgoztam ki, multiscale anyagmodellek és az ilyen modellek által nyújtott lehetőségek felhasználásával. A féknyereg alapanyaga egy PPS (polifenilén-szulfid) kompozit véletlenszerű orientációjú karbonszálerősítéssel, a laboratóriumi vizsgálathoz felhasznált próbatestek pedig egyirányú szálerősítésűek voltak. Szobahőmérsékleten és 150 °C-on szakítóvizsgálatokat végeztem különböző orientációkban. A szakítóvizsgálatok elvégzése után mikroszkópos vizsgálat és képelemzés segítségével meghatároztam az alapanyag szál kitöltési tényezőjét. A mért értékek alapján létrehoztam a kiinduló egyirányú szálerősítésű alapanyag multiscale modelljét. A Multiscale Designer szoftver egy optimalizáló eljárás segítségével kiszámította a 0°-os és 90°-os próbatestek által szolgáltatott értékek alapján az alapanyagot felépítő szálerősítés, illetve mátrixanyag mechanikai tulajdonságait. Az így létrejött modellel elvégeztem a 45°-os próbatest végeselemes szimulációját, majd ezt összehasonlítottam a mért értékkel, mely 8%-os relatív hibát mutatott. Ugyanezen eljárást elvégeztem a magasabb hőmérsékletű eredmények esetében is, ebben az esetben magasabb, 24%-os hiba mutatkozott, mivel a modell létrehozásához is a szobahőmérsékleten mért eredményeket használtam fel szálirányban. A szobahőmérsékletű és 150°C-os mechanikai paramétereket felhasználva lineáris interpolációval egy harmadik modellt is létrehoztam a 120°C-os hőmérséklethez. Az anyagmodellek által szolgáltatott mátrix, illetve szálerősítés mechanikai tulajdonságokat ezután bemenő paraméterként használtam egy-egy véletlenszerű rövidszál erősítéshez alkalmazható anyagmodell létrehozásához. A modellekhez a mért szál kitöltési tényezőt használtam fel ebben az esetben is, a véletlenszerű szálerősítést pedig kvázi-izotropként kezeltem. Az így létrehozott anyagmodelleket használtam fel a féknyereg szimulációjához. A féknyereg szimulációjakor az összeszerelés és a maximális féknyomás általi terheléseket vizsgáltam meg. A féknyereg a szimulációk alapján nem felelt meg a támasztott követelményeknek, mivel a 120°C-os és 150°C-os hőmérsékletek esetén a két fél szétnyílásának mértéke meghaladta az 1 mm-t. A nagy mértékű alakváltozás a kapcsolódó alkatrészek károsodását, illetve a fékhatás csökkenését, megszűnését okozhatja. Az alapanyag a szimulációk által szolgáltatott eredmények alapján nem alkalmazható a féknyereg esetében.
  • TételKorlátozottan hozzáférhető
    Optimizing manufacturing processes through industry 4.0
    Mansy, Ahmed Kamel Mansy Kamel; Domokos, István; DE--Műszaki Kar
    This study, which is being carried out in partnership with Kahramaa, aims to investigate and apply Industry 4.0 technologies to improve productivity and efficiency in the business's operations. The research addresses machinery-related issues and suggests creative solutions with a focus on using automation to improve Kahramaa's operational efficiency. Furthermore, the research attempts to create a complete technomatix model customised to Kahramaa's unique requirements. The study begins with an overview of the significance of automation for Kahramaa's operations, emphasising the possible advantages for improved operational effectiveness, resource optimisation, and overall process improvement. The research highlights the importance of implementing modern technologies to introduce a major shift in Kahramaa's manufacturing processes. The research then goes into pointing out and describing the difficulties created by the machinery used in Kahramaa's activities. This requires a careful examination of all current problems like the machine breakdown without sending out an alert. The study highlights the limitations that limit peak performance and give the possibility of inefficiencies and downtime. The research then concentrates on creating practical solutions to deal with the issues found with Kahramaa's machinery. To improve the efficiency and dependability of the machinery, this phase includes developing and putting into practise plans for predictive maintenance, real-time monitoring, and other data-driven techniques. Providing effective and efficient solutions that support Kahramaa's operational goals is the aim. Lastly, the research aims to create a technomatix model, this involves combining the manufacturing process into an organised and thorough framework that includes all of the technology components necessary for an automated process used, outlining each worker's and supervisor's responsibilities and workstations and machinery roles designed for Kahramaa's operations.
  • TételKorlátozottan hozzáférhető
    Application of AI in Autonomous Vehicles
    Naat, Yacine; Menyhárt , József; DE--Műszaki Kar
    This thesis is about the innovation of the various Application of AI in Autonomous Vehicles with a focus on the lane detection technology. Investigating the crucial task of precisely identifying and tracking lane boundaries, which is essential to facilitate secure and efficient self-driving navigation. This study comprises a thorough examination of existing literature related to algorithms used in detecting lanes with particular emphasis on computer vision and machine learning methods. The research, via experimental analyses evaluates the state-of-the-art algorithms' performance under diverse real-lifelike scenarios in virtual or simulated eviroment. Through the use of simulations, the thesis aims to evaluate how lane detection python algorithms utilising machine learning libraries respond to different conditions and road layouts and how modern machine learning models and AI trends can be harvested in the automotive industry. The research involves the use of a simulated environments mimicking real-world conditions, allowing for controlled experimentation and analysis. The challenges of real-world deployment occlusions, dynamic road conditions and diverse lane markings types are emphasised. The thesis also investigates how dependable can lane detection algorithms be, by monitoring the accuracy and error margin values with each training and observing the simulated car behaviour. Acknowledging a crucial need for robustness and versatility within autonomous navigation systems is given special attention in this thesis. Additionally, the thesis discussed the advantages and limitations of using simulated environments for testing and validating lane detection algorithms compared to real-world testing. Consideration of ethical and safety implications in the transition from simulation to real-world deployment were taken into consideration. In conclusion, the thesis end result showed a high-accuracy prediction of the lane detection developed for this project within the simulated environment, offering valuable information for researchers and developers working on autonomous vehicle systems. The findings contribute to the understanding of how well these algorithms perform in controlled, virtual settings, aiding in the refinement and optimization of lane detection systems for future real-world applications.
  • TételKorlátozottan hozzáférhető
    Designing a 3D printer
    Egbi, Daniel Bofa-Okim; Nemes, Dániel; DE--Műszaki Kar
    This thesis investigates the theoretical development of a 3D printer with exceptional accuracy, with a specific emphasis on virtual modelling, simulation, and optimisation methods. The suggested printer is designed to overcome the inherent difficulties of traditional 3D printing, with the goal of achieving unsurpassed precision in the creation of complex three-dimensional objects.The research commences by conducting a thorough examination of current 3D printing technologies, with the aim of identifying their constraints and potential areas for enhancement. Using sophisticated modelling tools, the thesis introduces an innovative conceptual design to improve accuracy and address typical printing problems.In addition, the conceptual design is situated within the wider scope of additive manufacturing, investigating potential uses in several sectors like medicine, aerospace, aviation, and mass customisation. The theoretical framework outlined in this thesis provides a roadmap for future academics and engineers aiming to transform these principles into physical technology.Ultimately, this research introduces an innovative and original blueprint for a 3D printer that achieves exceptional accuracy, thereby paving the way for progress in the field of additive manufacturing. The provided theoretical framework provides a clear plan for practical applications, hence creating new opportunities for precise engineering in three-dimensional printing.
  • TételKorlátozottan hozzáférhető
    Noise measurements and examination of noise sources in passenger cars
    Gawbah, Awadh Mohammed Awadh; Kocsis, Dénes László; DE--Műszaki Kar
    This thesis aims to get and measure the noise emitted by the passenger vehicle according to ISO 5128-1980, ISO 5130:2019, and the Soundcam device. The thesis starts with the theoretical background about the sound, human hearing, and the effect of noise on human health. After that, it addresses the different sources to the overall noise of the vehicle that experienced by the occupants, such as engine noise, tire noise, intake and exhaust noise, gearbox noise, and aerodynamics noise. And finally, ISO 5128-1980, ISO 5130:2019 methods, and SVAN 971 Sound level meters and Soundcam 2.0 devices, which are used in the measurements, are explained in details. The vehicle used in this test is MK7 Golf Volkswagen. The practical part of the thesis involves the measurement results at the different microphone positions, and at each vehicle operating conditions, which are the steady speeds, the full throttle acceleration, and the stationary mode inside and outside the vehicle. Then, the L_(AF max) average values are evaluated and compared at each condition, which serves to identify the noise sources and the difference in the results. The highest average value of L_(AF max) at the steady speeds is when the speed of the vehicle reaches 120 km/h, while the lowest value at 60 km/h speed. For the full throttle acceleration condition, the noise level in the driver seat is higher than the noise in the passenger seat. The L_(AF max) average value at stationary mode outside the vehicle is higher than the noise inside, and the driver seat has the lowest value at this measurement. The last part of the results is the Souncam average results, which are high at the front side, and low at the rear of the vehicle. The reasons for the results difference are explained in details in the discussion section. Finally, some solution ways for reducing the noise of the vehicle were introduced, such as using damping materials, the engine insulation, and improve some parts of the vehicle. In summary, this thesis offers significant complexities of vehicle noise, and offering valuable perspectives and solutions to minimize the noise impact on the environment around us.
  • TételKorlátozottan hozzáférhető
    Design and Analysis of a Solar Powered Car, Optimising for Sustainable Mobility
    Essil, Desmond Armoh Annan; Menyhárt, József; DE--Műszaki Kar
    The escalating global demand for green energy solutions has moved solar-powered vehicles into the spotlight as a promising avenue for reducing carbon emissions and mitigating environmental impact. This thesis investigates sustainable transportation, with a primary focus on the design and analysis of a solar-powered car. The study delves into the complex interrelation of automotive design principles, solar technology integration, and spatial optimization on the car body. The research journey encompasses four primary tasks. Drawing inspiration from leading solar-powered models such as Stella Terra and Lightyear One, the first task of this study builds an innovative design that seamlessly incorporate solar panels into the car's form without compromising aesthetics, aerodynamics, or functionality. To validate the design's efficiency, Solidworks Flow Simulation was employed for CFD analysis to evaluate the efficiency and viability of the car body. Aerodynamic factors are all examined to strike a balance between reduced drag and enhanced solar exposure. The CFD analysis not only validated the design but also informed iterative improvements. The third task delved into the integration of solar panels without compromising aerodynamics. Through meticulous consideration of panel placement and orientation, arrays are feased to strike a harmonious balance between solar energy harvesting and aerodynamic efficiency. The final task leveraged Simulink to model and simulate the solar energy collection and conversion process. The simulation showcased how energy harvested from the solar panels on the car's roof was efficiently converted and stored in the battery packs of the car. Though not modelled in detail, the prototype exibited very low drag and reduced pressure clouds around many vantage points during the simulation, which speaks to an Optimized Solar Car Prototype. The Simulink simulations also revealed how increased panel area on the body of the car proportionally affects the energy generated. Beyond the technical aspects, this thesis also raises awareness and interest in sustainable transportation solutions. The integration of solar power into everyday vehicles could inspire discussions on cleaner energy sources and influence public perceptions of eco-friendly mobility. Environmentally clean, socially equitable, affordable, economically viable, efficient and safe mobility is only possible through cooperation among the govemment as well as businesses and individuals.
  • TételKorlátozottan hozzáférhető
    Development and optimization of a prosthetic hand: design, control and functional evaluation
    Abdelaal, Serag Abdelnasser Sayed; Almusawi, Husam Abdulkareem; DE--Műszaki Kar
    The complexities of mechanical design in the development of a prosthetic hand are thoroughly examined in this thesis. The index finger is used as a standard to emphasize the standardization of finger design. Thorough Finite Element Analysis (FEA) is carried out to guarantee the prosthetic hand's robustness to varying loads. After that, the finger is subjected to a thorough kinematic analysis that treats it as a dual 4-bar mechanism and offers a complete understanding into its dynamic behaviour, velocity, and location over time. The assembly procedure is analysed in detail together with material selection criteria that prioritize PLA to highlight the strength and practicality of the mechanical design. The investigation additionally extends its scope to include sensors and a control system, with servomotors and electromyographic (EMG) signals being the main type of integration. The functionality of the prosthetic hand is improved by the ensuing integration. Thorough validation using SimScape Multibody produces outcomes that confirm the system's correct operation and careful attention to its mechanical components.
  • TételKorlátozottan hozzáférhető
    Design and Implementation of a Dual-Axis Mechanism for Precise Rotational Control
    Al Yamani, Mohammad Jihad; Nemes, Dániel; DE--Műszaki Kar
    In the realm of mechanical engineering, this thesis delves into the design, implementation, and optimization of a dual-axis mechanism controlled by an Arduino-based system. The primary objective is to seamlessly integrate theory and application, addressing the nuanced challenges of motor selection, gear system design, and control algorithm optimization. The literature review establishes a foundation by comprehensively surveying existing research on dual-axis mechanisms, and identifying gaps, controversies, and areas requiring further exploration. The design phase navigates through the complicated process of gathering requirements, specifying constraints, and leveraging 3D printing for fabricating gears, ensuring the mechanism aligns with size, mass, cost, and operational demands. Subsequently, the focus shifts to motor selection, where torque requirements are calculated, and a systematic approach guides the selection of a motor capable of optimal efficiency and reliability. This selection anchors the creation of a control system, employing the Arduino Uno circuit board, to orchestrate motor movements seamlessly. Experimental validation becomes a must in the fourth task, necessitating a rigorous setup to assess the mechanism's performance under varied loads and motion patterns. Data from these experiments enables a comprehensive evaluation of accuracy, repeatability, and speed, providing insights for potential improvements. Throughout this thesis, the simplicity and clarity of the code governing the control system underscore the fundamental principles of mechanical engineering. The successful assembly and testing of the circuit validate the theoretical foundations, affirming the practical viability of the designed dual-axis mechanism. This thesis goes beyond simple mechanical assembly, unfolding as an exploration through the combination of theory, design, and experimentation. It incorporates the core principles of mechanical engineering as they are applied to the dynamic domain of dual-axis mechanisms.
  • TételKorlátozottan hozzáférhető
    NDE and diagnostics of an industrial printer
    Zaman, Berkay; Balogh, Gábor; DE--Műszaki Kar
    Even though I started my research for my thesis in November 2022, my experience with industrial printers goes much further than that. I have been working on a maintenance team of an industrial printer since June 2022. I am aware of the typical failures and the maintenance procedure of industrial printers. When I was looking for a supervisor for my thesis, Mr Balogh Gabor helped me to utilize my knowledge and experience to the fullest by helping me specify my thesis topic on Heidelberg Speedmaster SM 74. I would like to thank him for helping me on my journey and keeping me excited for my thesis. As I started my research for my thesis, I feel more comfortable working on industrial printers, and I feel much more savant. Although I am very excited to write about diagnostics of industrial printers, I will try to express my words as plainly as possible. I hope this thesis will be able to give readers wisdom about industrial printers, diagnostics equipment, and their utilization. My aim is to determine the condition of the bearings which are providing the smooth rotational movement for the ink rollers. I will also explain printing technologies and SPM method. By the end of this project, we will know the condition of the bearings and the further action about these bearings.
  • TételKorlátozottan hozzáférhető
    Design and Additive Manufacturing of a Flat Form Tool
    Rahman, Shahbaz; Bodzás, Sándor; DE--Műszaki Kar
    The focus of this in-depth study is largely on the application of additive manufacturing in the creation of a flat form tool; an integral component utilized in several engineering applications. The study progresses with a holistic approach where each stage lends itself to the more broad-scope objective of reimagining the process of tool production through advancements in 3D printing technologies. Initially, the study embarks upon an in-depth analysis of the flat form tool, from both a constructional and analytical perspective. Essentially, this aspect lays the basis for the forthcoming design stages and the actual production methodologies. Furthermore, this study encircles the creation of CAD models for both the tool and the workpiece. The entire layout procedure enlists sophisticated modelling patterns tailored specifically to enhance precision and maximum functionality to develop models. Thus, paving the path for an efficient production process attuned to accuracy. Following the design phase is the actual operationalization of additive manufacturing of the tool. The Ultimaker 3, 3D printer is pressed into service, using PLA (Polylactic Acid) material, for manufacturing the tool. The Ultimaker Cura Slicer Software has been utilized to transform intricate digital blueprints into precise physical entities, with efficient material usage. Lastly, a finite element analysis (FEA) is performed on the produced tool to gauge its performance amidst operational situations. The results of this evaluation offer vital understanding of the tool’s mechanical idiosyncrasies, thereby aiding the ratification of design selections and corroborating functionalities along with resilience. Overall, this thesis proves conclusively that additive manufacturing holds viability and obvious benefits when it comes to producing tools tailored for unique requirements. Ultimate power of 3D printing in transforming tool production shouldn’t be neglected as it offers flexibility, waste minimization and heightened productivity. The study marks a potential ground breaker in its domain, revealing an all-encompassing mechanism to tool formation and manufacturing. By doing so, this study opens doors to future developments and potential advancements in additive manufacturing application in an extensive spectrum of industries.
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    An Output Power-levelling in Wind Energy Conversion System
    Demberel, Odmaa; Nemes, Dániel; DE--Műszaki Kar
    This research focuses on the critical challenge of output power-levelling in Wind Energy Conversion Systems (WECS), specifically addressing the application of Doubly-fed Induction Generators (DFIG). In the context of the global transition toward renewable energy, the optimization of wind energy systems is paramount to ensuring efficiency and reliability. The significance of this research lies in its direct impact on the operational stability and performance of DFIG-based wind turbines, a technology extensively utilized in modern wind farms. Power fluctuations, particularly in varying wind conditions, pose a significant obstacle to the seamless integration of wind energy into the power grid. The primary objective of this research is to provide a comprehensive understanding of the control system of DFIG wind turbines, with a specific focus on its capabilities during fault conditions, namely voltage dips. The investigation employs a dual approach, combining theoretical modelling and simulation models to analyse and understand the normal operation of DFIG systems. The simulation model, with an emphasis on the wind turbine model, serves as a powerful tool for comprehending the intricacies of the system under steady-state conditions. Theoretical models establish a foundational understanding of the DFIG system's behaviour during normal operation, offering insights into the interplay of various components, such as power converters and control systems. Simulation models, on the other hand, provide a visual representation of the DFIG system's behaviour, particularly the wind turbine model, enabling a dynamic exploration of the system under normal operating conditions. The visualization of signals and behaviours during steady-state conditions serves as a crucial reference point for further analysis. This understanding becomes pivotal when examining the system's response during voltage sags and other operational circumstances. This research not only contributes to addressing the challenge of output power-levelling in DFIG-based wind turbines but also enhances our understanding of their behaviour under varying conditions. The combination of theoretical insights and simulation results provides a comprehensive framework for optimizing the control systems of DFIG wind turbines, ultimately contributing to the reliability and stability of wind energy systems in the broader context of renewable energy integration.
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    Analysis and Testing of 3D models and infills
    Gillani, Syed Musa Hassan; Balogh, Gábor; DE--Műszaki Kar
    In the thesis work, you will be learning about the general effects of Infills. Measurements of each infill such as the general stress and strain have been calculated. Anycubic Kobra 3D printer and Anycubic 3D PLA filament are used for the tests. Furthermore, each infill in the software Ultimaker Cura has been used. Ever since the start additive manufacturing has faced many problems. Some of them include an overhang layer, materials not bonding together properly, and not enough knowledge of the infills and the effects, such problems affect the print quality and have increased defects. The main purpose of this thesis is to understand the effects of each infill where they can be distributed and used in different objects. This can help us reduce the amount of material we use and, in some cases, infills can also reduce the time taken for something to manufacture. The 3D printing technologies with defined infills and uses can expand easily, and such infills can further be integrated into multiple software and help in part optimization. To understand the effect properly, I designed 2 Tests with different properties. The properties included layer heights, wall layer counts, infill density, and top and bottom layer thicknesses. These properties were changed for the tests and the results were observed for differences. After reducing the layer counts and allowing the infill to have more space in the test sample the results were observed. A tensile testing machine with an integrated optical image camera to measure the accurate strength and strain of the materials was used. The final results were compared and the infill effect. The effect of walls was also observed in each test where reducing the wall count more space was available for the infills and a larger difference with results completely dependent on the infills was observed.
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    Computational Fluid Dynamics Analysis of Tesla Cybertruck
    Elzamar, Mostafa Ahmed Mostafa Mohamed; Szodrai, Ferenc; DE--Műszaki Kar
    This thesis investigates the aerodynamics of the Tesla Cybertruck, with a focus on enhancing its overall efficiency. Objectives include a detailed analysis of airflow patterns and drag forces, employing advanced computational fluid dynamics (CFD) techniques. The study addresses existing gaps through a literature review, drawing insights from analogous geometries and drag reduction studies on pickup trucks. Methodologically, precision mesh generation techniques such as double precision, local sizing, and curvature meshing are applied. The simulation setup is rigorously validated through sensitivity studies and comparisons with Numeric Systems GmbH, establishing the reliability of the methodology. Tasks encompass the examination of separation bubbles, sharp edges, wake dynamics, and vortex shedding patterns, contributing to a comprehensive understanding of Cybertruck aerodynamics. The conclusion highlights key findings derived from the analysis. The identification of a separation bubble at the front of the hood and the impact of sharp edges on airflow dynamics provide valuable insights. The study reaffirms its credibility through comparisons with Numeric Systems GmbH, showcasing the robustness of the simulation methodology. The results contribute not only to academic knowledge but also hold practical implications for optimizing the Cybertruck's performance. The applicability of these findings extends to the broader discourse on electric vehicle design, offering insights for practical design strategies to enhance performance and efficiency.
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    Health monitoring of Electric Vehicle
    Satkali, Alibi; Menyhárt, József; DE--Műszaki Kar
    This work investigates critical aspects of lithium-ion battery technology in electric vehicles (EVs), focusing on thermal management and novel charging solutions. Electric Vehicle market getting popular day by day; Countries as China, Germany, and USA. The parts difference, as AC/DC converter and engine, etc. Lithium-ion batteries offer high energy density but require precise temperature control for optimal performance and safety. The study explores various thermal management methods, including air cooling, liquid cooling, and phase change material systems. Simulation scenarios, such as nail penetration-induced damage, are analyzed, and an integrated cooling system is proposed for monitoring temperature profiles. The main problem now days is charging station numbers. To increase the number of car that charging in one moment, proposed charging method by Tesla’s coil and Tesla’s car bases. A SWOT analysis evaluates the coil charger, highlighting strengths, weaknesses, opportunities, and potential threats. Practical solutions and models from existing studies contribute valuable insights into the field. The findings underscore the importance of effective thermal management for lithium-ion batteries and propose a forward-looking charging solution to address the growing demands of the electric vehicle industry. Further research and development are recommended for the successful implementation of these advancements.
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    INVESTIGATION OF THE EFFECTS OF THE SURFACE QUALITY ON THE MECHANICAL PROPERTIES OF ADHESION
    Karakuş, Göksu; File, Máté; DE--Műszaki Kar
    The reason I have choosen the topic ,,Investigation of the effects of the surface quality on the mechanical properties of adhesion” is because there are more and more different kind of adhesive technologies and in opinion it is important to give them more attention at mechanical engineering as well. In my thesis I am going to talk about how different type of surfaces effect on adhesives. I am going to test 3 different type of surfaces for aluminum with my supervisor. The process by which one material attaches to the surfaces of some other substance is known as adhesion. Its use is simple and economical. It gives surface impermeability. It has the advantage of being able to be applied to practically any surface or substance. It is capable of filling in the blanks. It is both insulating and dampening. Strength-to-weight ratios are proportionate to one another
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    The Noise emission analysis of internal combustion engine and electric motor vehicles
    Khurram, Muhammad Haseeb; Kocsis, Dénes László; DE--Műszaki Kar
    The transition from internal combustion engine (ICE) vehicles to electric vehicles (EVs) is often brought up in relation to the advantages of emissions reduction for the environment. However, the acoustic environmental impact, particularly the noise emission characteristics of these vehicles, is a subject that needs comprehensive study. This thesis provides an in-depth analysis of noise emissions from both ICE vehicles and EVs, aiming to elucidate their noise profiles and the implications for urban noise pollution. The research methodology involved a series of controlled experiments using the SoundCam 2.0 device to capture and analyze the noise levels of a 2017 MK7 Volkswagen Golf representing ICE vehicles and a 2020 Volkswagen e-Up for EVs. Measurements were conducted across six different scenarios, including stationary baseline noise levels, full throttle acceleration, and pass-by noise at varying speeds, to simulate real-world driving conditions. Initial findings indicate that at lower speeds, EVs exhibit significantly lower noise levels compared to their ICE counterparts, primarily due to the absence of engine noise. This suggests that EVs could play a crucial role in reducing noise pollution in urban environments, where lower speeds are common, and noise pollution is a significant concern for public health and well-being. However, the research also uncovered that the noise level difference between ICE vehicles and EVs diminishes as vehicle speed increases. At higher speeds, non-propulsion-related noises such as tire-road interaction and aerodynamic effects become more pronounced, leading to a convergence of noise levels between the two vehicle types. This phenomenon highlights the complex nature of automotive noise sources and underscores the need for a diverse approach to noise reduction that goes beyond the powertrain. The thesis further explores the potential environmental health benefits of widespread EV adoption, considering the lower noise levels at typical city driving speeds. It also discusses the challenges and opportunities for noise reduction technologies, emphasizing the importance of addressing aerodynamic and tire-related noise, especially as the automotive industry continues to evolve towards electric mobility. In conclusion, this thesis provides valuable insights into the comparative noise emissions of ICE vehicles and EVs, offering a subtle understanding of their environmental impact. The findings advocate for the integration of noise reduction strategies in vehicle design and urban planning, reinforcing the role of EVs in creating quieter, healthier cities. Future research directions are proposed, focusing on the development of innovative noise control technologies and the establishment of new urban design principles that consider the acoustic environment as a critical component of urban liveability.
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    Geometric design, modelling, finite element analysis of bevel gear with a spiral tooth direction
    Rahat, MD Monuril Islam; Bodzás, Sándor; DE--Műszaki Kar
    This study takes a close look at the geometric design, modeling, and physical analysis of a pair of bevel gears with spiral teeth. The focus is on a single project. It started with a close look at a spiral bevel gear taken from the differential box of a Polski Fiat. Using design software, perfectly designed the gear. Keeping the original parameters from the Polski Fiat gear was key. Paid a ton of attention to this, so the modeling process was accurate and trustworthy. This laid a solid groundwork for the physical analysis which was done afterwards. Crucial to the study was making four distinct gear designs, each with a unique helix angle (25°,30°,35°& 40°). This method made a deep side-by-side comparison possible, looking closely at how changes in the helix angle influence the gear's functionality under simulated scenarios. Ansys was used for static structural analysis, and each model faced a variety of trials with differing moment loads. The emphasis was on important measures like total deformation, directional deformation, equivalent stress, and normal stress. This study's results gave useful understanding about how each gear type behaves under various situations. It uncovered important information on how helix angles impact and how well the gear works. Especially looking at how stress is spread around the gear and how the gear changes shape. These findings were correct and could be used accurately by comparing them to theory and well-known gear standards