Theses (Department of Mechanical Engineering)
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Theses collection of the Faculty of Engineering.
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Megjelenítve 1 - 20 (Összesen 75)
Tétel Szabadon hozzáférhető Optimization of Supply in context of Industry4.0 by integrating Six Sigma, FMEA and Preventive Maintenance.Mashele, Nkosingiphile Boys; Deák, Krisztián; DE--Műszaki KarThis thesis focuses on optimizing supply chains within Industry 4.0 by integrating Six Sigma, FMEA, and predictive maintenance. It explores how these methodologies can enhance efficiency, reduce risks, and drive continuous improvement in modern supply chain operations. Advanced analytics and data-driven strategies are utilized to streamline processes and ensure timely decision-making. Real-time communication platforms play a critical role in monitoring and improving key performance indicators (KPIs). Six Sigma is applied to minimize process variation and maintain high-quality standards, while FMEA identifies and mitigates potential risks in the supply chain. Predictive maintenance is incorporated to enhance equipment reliability and prevent unexpected downtime. The combination of these approaches fosters a resilient and adaptive supply chain framework suited for the challenges of Industry 4.0. Results are analyzed through graphical data, showing measurable improvements in supply chain performance from 2020 to 2024. This research highlights the importance of integrating quality, risk, and maintenance strategies for achieving long-term supply chain optimization.Tétel Szabadon hozzáférhető Uneven wear of Volvo caliper break padsAubakirov, Daniyar; Menyhárt, József; DE--Műszaki KarUneven brake pad wear is a significant concern in the operation and maintenance of large truck braking systems, particularly in commercial vehicles like Volvo trucks. This study examines the primary origins, effects, and possible remedies to this issue, emphasizing materials science and design optimization. A mixture of theoretical investigations, finite element analysis (FEA), and three-dimensional simulation modeling was employed to assess the frictional interactions between brake pads and discs under diverse operating situations. The study commences with a comprehensive examination of the physical qualities and composition of the brake pads and discs, emphasizing attributes such as compressive strength, thermal conductivity, and wear resistance. Multi-circuit pneumatic systems working pattern as well as the principal work of pneumatic braking system starting from the relatively old models of trucks was analyzed. Furthermore, the effect of friction forces resulting in the change of internal energy was showed. The primary findings of the 3D modeling indicated that temperature variations on the contact surfaces substantially enhance wear in specific regions of the pads. This was validated by FEA experiments, which detected hot patches and stress concentrations under severe friction. Furthermore, the modeling demonstrated how braking dynamics, including uneven drive force and disc surface irregularities, intensify the wear pattern. This paper proposes solutions that involve altering pad shape for improved pressure distribution, employing modern materials with enhanced thermal resistance, and optimizing cooling methods. Suggestions for future endeavors encompass the incorporation of machine learning algorithms for predictive maintenance and the examination of novel self-regulating brake systems. This study's conclusions seek to augment the reliability of brake systems, increase safety, and diminish maintenance expenses for Volvo trucks and comparable heavy-duty vehicles, thereby contributing to the overarching advancement of sustainable and efficient transportation technology.Tétel Szabadon hozzáférhető Performance Analysis of a Drone Propeller by Analytical and Numerical MethodsKaspapettai Kuppusamy, Naveen; Szodrai, Ferenc; DE--Műszaki KarThis study focuses on calculation the aerodynamic forces of a small quadcopter propeller under hovering conditions, which is vital for drones used in Industry 4.0 applications like photogrammetry and facility inspection in automotive production. The research analyzes a straight tri-blade propeller with a NACA 0012 airfoil using analytical methods (momentum and blade element theories) and numerical simulations (ANSYS CFX with RANS method). The analytical model predicts a thrust of 1.2519 N, which is validated by simulation results showing a thrust of 1.3604 N, with an 8.67% difference, confirming the model's accuracy. These findings shows the particality of optimizing small drone propellers using combined analytical and numerical approaches. The study contributes to advancing drone designs for real-time, flexible production processes and digital twin creation in the automotive industry.Tétel Szabadon hozzáférhető Determination of the compressive properties of lattice structures produced by SLA technologyUmeh, Ugonna Samuel; Mankovits, Tamás; DE--Műszaki KarThis study uses compression testing to determine the effect of porosity change on the effective Young’s modulus of lattice structures. Three sets of lattice structures with different porosities were designed and 3D printed. They were then subjected to compressive forces, and their displacement was documented. This data indicated how the effective Young's modulus varied with a change in porosity. Finite element analysis was also employed to see how effectively it predicted material properties.Tétel Szabadon hozzáférhető Analysis of the Correctness of the Twist Drills by Tool Measurement SystemTan, Rong; Bodzás, Sándor; DE--Műszaki KarThis thesis evaluates the accuracy and wear of twist drills using an advanced measurement system. Key parameters such as drill point angle, cutting edge symmetry and outer corner radius were analysed. The performance of the drill was significantly improved by resharpening, but still deviated. The results of the study provide recommendations for improving machining efficiency and ensuring consistent quality.Tétel Szabadon hozzáférhető Measurement of Noise Inside Motor VehiclesMustafa, Muhammad Ali; Kocsis, Dénes László; DE--Műszaki KarRoad vehicle noise significantly impacts our daily lives, with interior vehicle acoustics creating a unique auditory experience. Following ISO 5128:2023 guidelines, we measure and analyze vehicle noise by considering factors like engine operation and tire-road interaction. This study aims to understand vehicle acoustics for improved rider comfort and environmental impact. Traffic noise can affect mental health, causing stress and reduced concentration. Sound level meters (SLMs) help monitor road noise levels, using microphones to measure sound pressure. These devices require proper calibration and standardization for accurate readings.Tétel Szabadon hozzáférhető OPTIMIZATION OF THE MANUFACTURING PROCESS TO IMPROVE EFFICIENCY AND REDUCE COSTHAMZA, MUHAMMAD; Balogh, Gábor; DE--Műszaki KarThe thesis discusses the optimization of an injection molding manufacturing process at a factory with a view to improving efficiency, cutting costs, and maintaining quality. By using KPIs, process improvements were developed and implemented through Lean, Six Sigma, and CI techniques like Kaizen. Main areas of focus were reduction in cycle time, defects, material waste and maximization of machine utilization. Real-time data tracking and digital monitoring systems were used to check if the changes introduced were effective or not, which improved the processes. The optimization efforts really paid off. Cycle time was reduced by 20%; defect rates were reduced by 50%; and material waste was reduced by 50%. There was also a 12% improvement in machine utilization. Upgraded production throughput with saves costs and improve quality while engaging the workforce presently. Thus, enhances production throughput. This report emphasizes a continuous process monitoring system that requires employee involvement on site and data driven decisions. The thesis wraps up with suggestions on how to use technologies like artificial intelligence, and further optimizing sustainability in injection molding for competitive endurance.Tétel Szabadon hozzáférhető Determination of the working characteristics of additive printed TPU product using finite elements simulationAhmed, Anis; Huri, Dávid; DE--Műszaki KarThe thesis explores the determination of the working characteristics of additive printed rubber-like products, a critical factor in the field of additive manufacturing. An overview of various additive manufacturing techniques and the range of rubber-like materials that maybe produced is given. The study revolves around determining the working characteristics and accuracy of the results of Thermoplastic Polyurethane (TPU) printed product. It explores the introduction of hyperelastic material models and explains the curve fitting procedure used to precisely depict these materials' behaviour under various stresses. In order to fully understand how the material responds to different situations, a key component of the study is the process of fitting the parameters of the material model using various datasets of test loads from compression and tension test results. Subsequently, by performing finite elements analysis on a printed TPU product, the study validates the accuracy of the obtained results, guaranteeing the validity and authenticity of the conclusions.Tétel Szabadon hozzáférhető OPTIMIZATION OF SUPPLY CHAIN LOGISTICS IN THE MANUFACTURING SECTORJoseph, Jesse Nomshu; Menyhárt, József; DE--Műszaki KarThe thesis explores strategies to enhance supply chain efficiency and resilience through advanced technologies and innovative practices. It identifies key challenges such as transportation delays, inefficiencies, and data security risks that hinder operational performance in manufacturing. By leveraging tools like AI, IoT, and real-time analytics, the research highlights solutions for optimizing inventory management, improving demand forecasting, and fostering collaboration among stakeholders. Sustainable logistics practices and resilient frameworks are emphasized to reduce costs and environmental impact while meeting market demands. The study concludes that integrating technology, strategic partnerships, and data-driven decision-making is essential for manufacturing competitiveness in a dynamic global market. These insights provide actionable recommendations for industry professionals and policymakers.Tétel Szabadon hozzáférhető Simulation Based Engineering OptimizationKruja, Egin; Huri, Dávid; DE--Műszaki KarThis thesis explored optimizing functionally graded sandwich panels for minimum mass and deformation under a sinusoidal load. Using a parameterized model in ANSYS, the study efficiently explored the design space to find the best trade-off between these conflicting objectives. Evolutionary and Particle Swarm Optimization algorithms were employed to navigate the complex design space and converge towards optimal solutions. The results offer valuable insights for designing functionally graded materials, enabling engineers to tailor material properties for specific performance requirements. By balancing mass minimization and deformation control, the study provides a framework for enhancing the structural performance of these advanced materials.Tétel Szabadon hozzáférhető Shopfloor Management, Analysis, and Process ControlShawish, Ghazi Hashem Mohammad; Czégé, Levente; DE--Műszaki KarThis thesis examines the quick service process of a vehicle service center and proposes improvements using Lean principles to enhance efficiency and customer satisfaction. Through tools such as Value Stream Mapping (VSM) and Root Cause Analysis (RCA), key inefficiencies like delays in parts procurement, excessive movement, and lengthy administrative tasks were identified. To address these issues, a Centralized Data Management System, Kanban system, and 5S workplace organization were implemented. These solutions reduced lead times by 26%, saving 25 minutes per vehicle, and increased process efficiency to 66.2%. A financial analysis demonstrated that the proposed changes are cost-effective, with a payback period of 1.85 years and significant annual savings. This research highlights the adaptability of Lean tools in service environments and provides a framework for improving operational performance in similar contexts.Tétel Szabadon hozzáférhető Simulation of Hydraulic and Pneumatic systems by using MATLAB/SimscapeRiano-Rencsár, Alessandro; Hajdu, Sándor; DE--Műszaki KarThe thesis explore the comparison of pneumatic and hydraulic actuation systems implemented in a DRS system of a Formula 1 modeled in MATLAB/Simscape. Key perfomance metrics such as velocity, acceleration force and pressure are analyzed, which hydraulic system operates at 250 bar while pneumatic operates at 8 bar with both using a single-acting actuator for flap movement. Simulations reveals distinct differences between two systems showing respective advantages and disadvantages for this implementation. Findings indicates that the hydraulic system delivers superior force and speed, while the pneumatic system offers smoother and more controlled actuation. These insights highlight opportunities for optimizing DRS mechanism to meet the required performance required in Formula 1. The thesis establishes a simulation framework that can be helpful for using the MATLAB enviroment and future developed of advance actuation technologies for motorsport applications.Tétel Szabadon hozzáférhető Enhancing Lean Manufacturing Through Lean Principles and Advanced Technologies in EAF Steelmaking IndustriesAl Sharkawi, Ibrahim; Menyhárt, Jószef; DE--Műszaki KarSteelmaking and manufacturing industries are one of the most important industries today. Yet, it also has room for improvement in lean thinking, technologies, and sustainability. This thesis will explain how to automate certain pats of the process in the Electric Arc Furnace (EAF) steelmaking industries, including ways to make it faster, more sustainable, eco-friendly, safer for work, and improving lean principles along the way. The world is headed for a future of automation and AI with large goals set for the steel manufacturing industries by 2050, and these are ways that medium-sized or unoptimized EAF steelmaking businesses and industries can improve on, how to implement, and results to expect.Tétel Szabadon hozzáférhető Analysis on the accuracy of virtual clamping in the field of the 3D scanningMurtaza, Ali Haider; Hajdu, Sándor; DE--Műszaki KarVirtual clamping, a technique that simulates deformations during clamping, has been introduced to measure large and flexible parts in a free state. This method reduces inspection time and costs, but the reliability and accuracy of this method are still being evaluated. The goal of this thesis is to perform 3D scanning on actual mechanical parts and I have selected impeller parts. I used a Powershape scanner to accurately scan impellers with thin-walled wings and SOLIDWORKS software for scan data modeling.Tétel Szabadon hozzáférhető Quality Assurance in Automotive ManufacturingKhalifa, Mahmoud Walid Ahmed Mosaad; Menyhárt, József; DE--Műszaki KarMy Thesis talks about the importance of quality assurance in the manufacturing of cars and car parts. Using modern and traditional methods .It also shows examples and case studies of successes and failures. At the end it shows what can be possible in the future because of the introduction of AI in manufacturing.Tétel Szabadon hozzáférhető Heat pump efficiency analysisIsmagulova, Ademe; Szodrai, Ferenc; DE--Műszaki KarThe modern demand for energy efficiency and environmental sustainability makes heat pump technology increasingly important for heating and cooling systems. This thesis evaluates the efficiency of heat pumps using commercial software tools and re-analyzes the obtained results in the ANSYS and Solid Edge environments to compare calculation methods and assess practical application accuracy. The study begins with an analysis of heating systems in Hungary, focusing on cen-tralized and individual systems. Heat pump technologies are explored as a sustainable alternative, emphasizing their integration into centralized systems. Various heat pump types—air-source, ground-source, and water-source—are compared in terms of perfor-mance metrics such as the Coefficient of Performance (COP) and Energy Efficiency Ra-tio (EER). The thesis also examines the design, performance, and efficiency of heat exchang-ers and other critical components, such as compressors, using SWEP, Solid Edge, and ANSYS software. Modeling in Solid Edge facilitated the detailed design and evaluation of heat exchanger components, providing insights into structural and operational aspects. The findings highlight discrepancies between software simulations and real-world per-formance, offering valuable insights for optimizing heat pump operations. By addressing technical challenges and proposing design improvements, this re-search contributes to enhancing the feasibility and effectiveness of heat pump systems, particularly in Hungary’s climate and energy landscape. The results have broader impli-cations for advancing sustainable energy solutions globally.Tétel Szabadon hozzáférhető Generative Design of a BracketEl Ghazawi, Mohamad; Mankovits, Tamás; DE--Műszaki KarThis project focuses on the use of generative design to optimize a bracket. In the introduction, I explain how generative design uses automation and algorithms to improve the design process. I discuss the steps involved, such as creating a CAD model, performing finite element analysis (FEA), and using SolidWorks' generative design tools. I highlight the advantages of this approach, like saving time and increasing efficiency, while also mentioning challenges such as high computational demands and ethical concerns. The next section goes deeper into the process, covering the use of topology optimization and additive manufacturing, specifically FDM. My project aims to reduce weight and cost in the design of a belt roller back bracket by using FEA with Stainless Steel AISI 304. The results show a reduction in mass while keeping the design structurally sound. Finally, I discuss the work analysis conducted on the bracket, which helps validate the effectiveness of generative design in real-world applications by identifying stress points and weaknesses. Overall, this project combines theory and practical applications in engineering design.Tétel Szabadon hozzáférhető Mechanical behaviour of Polymers for Compression LoadAftab, Muhammad Noman; Huri, Dávid; DE--Műszaki KarThis thesis explores the mechanical properties of polymers, focusing on their behaviour under compression load. It begins by discussing the basics of polymers, their classification, and historical background. The study employs compression testing and Finite Element Analysis (FEA) to analyse polymer behaviour, highlighting the importance of nonlinear material models. Additionally, it investigates the implications of polymer behaviour in extreme conditions and high-rate mechanical research, along with tensile properties, strain hardening phenomena, and shear properties. The thesis contributes to understanding polymer mechanics for engineering design and innovation. The experimental part of the thesis focuses on compression testing methodology and FEA validation. It utilizes electromechanical testing equipment and software, along with a polymer specimen (Celanese's GUR 4150). Calibration, compression tests, and FEA analysis are conducted, demonstrating consistency between experimental and simulated results. The Calibration of the equipment in necessary to get the required results for the given experiment and I have explained the process of it in the thesis. The compression test is itself a main part of the whole system. We will put the subject under the machine before and after taking all the measurements and we will compare it. I will be able to conclude the Stress-Strain curves from the values and we will subject it to force until the breaking point post-processing confirms the accuracy of the experiment and in simulation, emphasizing the importance of material selection and testing methodologies for industrial applications. In simulation we will use the same process, but I will first draw the structure in Femap software, and we will set all the necessary conditions to perform the simulation. We will apply loads on the given structure and start the simulation. The results we will get from the simulation we will draw the stress-strain curves and will subject it to the comparison of the measured and simulated results which you can find it in the thesis. From that we can show the behaviour of polymers acting under compression load.Tétel Szabadon hozzáférhető Comparative analysis of noise emitted by accelerating road vehicles of different engine typesAl Burini, Akram Maher Fawzi; Kocsis, Dénes László; DE--Műszaki KarNoise is being generated more and more everyday from different factors in the world but the most generating to it is the road traffics that is causing many problems for the environment especially the humans as it puts them in health danger were they can have some disabilities such as hearing problems and also mental health problems where they can not have tranquillity.This study will focus on the studying different type of vehicles with different engines based on the International Standard Organization to find out which type of vehicles is the safest for the environment, moreover what are the most factors generating the noise so later on the vehicles manufacturers will take that in consideration and work on improving it such as higher quality of noise absorbing material used in different part of the vehicles.Tétel Szabadon hozzáférhető Wheelchair Maintenance through Durability and Fault Diagnosis with User Centered DesignHaroun, Mohamad Maher; Erdei, Timotei István; DE--Műszaki KarThis thesis underscores the critical importance of wheelchair maintenance for ensuring safety, reliability, and usability for individuals with mobility impairments, advocating a proactive approach to prevent issues before they develop. It presents a comprehensive analysis of wheelchair durability and predictive maintenance strategies, utilizing Finite Element Analysis to assess and enhance the structural integrity of key components like the footrest and frame. Simulation-driven predictive maintenance is developed through modal analysis and fatigue assessment, enabling early identification of potential failure points and integrating sensors for real-time monitoring and diagnostics. A user-centered design approach tailors maintenance solutions to the needs of wheelchair users, prioritizing ease of maintenance and adaptability. Maintenance optimization strategies focus on standardizing procedures and leveraging predictive analytics to minimize unexpected breakdowns and ensure consistent performance. The results provide a framework for improving wheelchair maintenance through structural optimization and real-time fault monitoring.