Theses (Department of Vehicles Engineering)

Állandó link (URI) ehhez a gyűjteményhez

https://hdl.handle.net/2437/360725

Theses collection of the Department of Vehicles Engineering. The collection was started in 2023.

At the University of Debrecen, in accordance with the 2022 amendment to the 2011 Higher Education Act, student theses are only accessible from devices connected to the University's Eduroam WiFi network or from a university IP address.

“The thesis or diploma work of a student who has successfully passed the final examination shall be stored in full in the academic system of the higher education institution, and a record shall be maintained thereof. The stored theses and diploma works – with the exception of parts classified as confidential in accordance with the relevant legislation – must be made accessible and searchable without restriction through the academic system.” Further info on the National Higher Education Act in Hungarian: Felsőokt. tv. (új) - 2011. évi CCIV. törvény a nemzeti felsőoktatásról - Hatályos Jogszabályok Gyűjteménye.

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Megjelenítve 1 - 20 (Összesen 50)

Korlátozottan hozzáférhető
Evaluation of Repair Techniques for Sheet Metal and Composite Structures in Airline Operations
Thamburan Kandi, Abhinave; Zsolt, Tiba; DE--Műszaki Kar
The thesis offers a comparative analysis of the repair methods of sheet metal and composite aircraft structures in terms of systematic literature review of more than 40 authoritative sources. The paper compares riveted, bolted and bonded repairs on aluminum structures, scarf, step-sanded, external patch, bolted, and injection repair on composite structures in the commercial aviation. The most important results indicate that sheet metal repairs are more flexible in operation and that the various acceptable techniques have been able to restore 80-100 percent of the original strength, whereas composite repairs perform better (80-95 percent in scarf repairs) but need specialized equipment and controlled environments and highly qualified workers. The study determines trade-offs that are critical in terms of structural performance, operational feasibility, time requirements, and cost considerations and the effect of trade-offs on maintenance decision-making. Maintenance organization-specific advice and recommendations regarding capacity development roadmap and workforce training priorities in maintenance organizations are also presented depending on the fleet size. This paper determines decision support systems that optimize the technical performance against operational limit to guarantee airworthiness and cost efficiency in current maintenance processes in aircraft.
Korlátozottan hozzáférhető
DEVELOPMENT OF PRESSURE SENSORS FOR AIRCRAFT FUEL SYSTEMS
Salameh, Ahmad Ziad Ahmad; Tiba, Zsolt; DE--Műszaki Kar
This thesis develops a pressure monitoring system for the Cessna 172’s pump-fed fuel setup, targeting faults such as leaks, blockages, contamination, pump starvation, and pressure drops. The aim is not only to detect these problems early but also to apply targeted responses based on the fault type. A pressure sensor continuously monitors the fuel line; its analog signal is converted digitally by a built-in Analog to Digital Converter, which operates in parallel with the existing approved path. This ensures that there is no interference. The digital stream passes through SCADA and Rawan layers before reaching a decision module. An AI engine acting as co pilot analyses the data, learns from it, classifies faults, and triggers corrective actions or suggests corrective steps to the pilot. A model of fuel system dynamics is modelled in MATLAB/Simulink using Bernoulli and Darcy-Weisbach equations to address both normal and faulted operation. Performance analysis indicates the ability to detect faults early with a high degree of accuracy in pressure drift detection to within 0.1% of range in under 30 seconds. This paper will also cover economic study for future implementation as well as examines environmental and safety implications related to fuel-system health monitoring. Recommendations are provided for extending the system to certification pathways and cockpit integration in general aviation aircraft.
Korlátozottan hozzáférhető
Nikola Tesla Turbine Turbocharger Application - Concept & Modeling
Syed, Hassan Ali; Tiba, Zsolt; DE--Műszaki Kar
The thesis illustrates and also explains the fundamentals involved in the current forced induction methods in an Internal Combustion Engines (ICE) It also brings to attention the application of those fundamentals in the current technology that is currently in use to create the forced induction components for the ICE. Specifically, the forced induction method of using a turbocharger compressor and its performance metrics and parameters. Then the research paper discusses the innovative and inventive solution of using the Nikola Tesla Turbine, a bladeless unconventional turbine, in place of the current bladed turbine inside a turbocharger. The research first goes into details about the structures and the working principles of the Nikola Tesla Turbine. Then it discusses how it can be integrated into the current turbocharger compressor. Before the integration, its complexities and the challenges that come with it are considered. There is an initial discussion of what other parameters need to be taken into consideration. The initial discussion is important because to achieve a high RPM, isentropic efficiency, Torque, Torque Distribution across channels, Nozzle-Rotor (N-R) Chamber Dynamics, Mach Number and Velocity Gradients, and to achieve all of it quickly and efficiently with minimum losses, several parameters of the bladeless turbine need to be considered. These parameters include disc size, disc spacing, disc thickness, disc material, outflow holes or ports and many more. After these have been thoroughly analysed, examined and selected, there is a guide to how the integration is realized. Furthermore, there are illustrations to help visualize the final construction and the resultant workings of the final invention. Keywords: Tesla Turbine; RPM; Torque; Viscosity; Fluid Dynamics; Isentropic Efficiency; Thermal Efficiency; Mechanical Stress; Boost; Turbocharger; Disc; Turbulence; flow patterns.
Korlátozottan hozzáférhető
Nose Landing Gear - Non Destructive Testing - Torsion Link
Faeiz, Ayaan; Tiba, Zsolt; DE--Műszaki Kar
This thesis reviews the application of non-destructive testing techniques to Boeing 737-800 nose landing gear torsion links, current inspection techniques, failure mechanisms, and technical procedures. Examinations of Boeing NDT Manual D6-37239 procedures are identified here which cover ultrasonic tests using Reference Standard 350 and eddy current inspection methods and baseline capabilities and limitations in the methodologies. By investigating known performance failures such as the ASL Airlines torsion link fracture at 27,000 flight cycles and the Delta Flight 1092 nose landing gear collapse, the research identifies a key unmet need for detection by which conventional detection for crack detection achieves 0.040 inches, and from 0.025 inches to 0.030 inches. The analysis includes real operational data from the Enter Air Services (Part 145 AMO) including five Boeing 737-800 High-Frequency Eddy Current inspection reports, which provide real evidence of the application of Boeing practices on the job and a comparison with theoretical concepts using real-life maintenance practices. Advanced technologies (Phased Array Ultrasonic Testing and Eddy Current Array) and risk-based inspection techniques such as those that address operational severity differences between the Boeing 737 fleet will be analyzed, in the future. The review aims to connect concepts from previous research on NDT with practical aviation maintenance with a view to understanding the limits and potential improvement in the inspection practice in landing gear structural integrity assessment.
Korlátozottan hozzáférhető
Ice Accretion and Ice Protection Systems – Comprehensive Analysis – Boeing 737 Next Generation
Qasem, Zakarya Al-badwi Abdulrahman; Zsolt, Tiba; DE--Műszaki Kar
This thesis is a technical analysis of the ice and rain protection systems of the Boeing 737 Next Generation (NG), which combines aerodynamic principles, icing physics, system design, regulatory standards, and operational factors. The paper starts with the definition of aircraft icing mechanisms, such as the behavior of supercooled droplets, the types of ice accretion, and the aerodynamic and operational effects of ice accretion. These phenomena are placed in a detailed literature review in the historical research, contemporary thermodynamic modeling, and certification standards, including FAR/CS-25 Appendix C and O. The main part of the thesis examines the Boeing 737 NG ice protection architecture, such as pneumatic thermal anti-icing of wing leading edges and engine inlet cowls, electrically heated air-data probe systems, flight deck windows, and fluid systems. Boeing system descriptions and maintenance documentation are used to examine system components, functional principles, control logic and failure modes. The experiment measures the effectiveness of the system in reducing lift degradation, drag increment, stall-margin degradation, and sensor malfunction related to icing. New technologies of ice protection such as electrothermal systems, intelligent detection, icephobic surfaces, and hybrid architectures are discussed in relation to the gaps in research on SLD behavior, limitations of computational models, material durability, and integration of more-electric aircraft. The results point out the limitations and opportunities of existing 737NG solutions and determine the key areas of technological improvement, namely, energy efficiency, high-tech sensing, and multi-physics simulation.
Korlátozottan hozzáférhető
Crashworthiness in The Safety of Small Aircraft
Saleh, Mahmoud Gamal Khalil Esmail; Kertész, József; DE--Műszaki Kar
This thesis investigates crashworthiness in small aircraft, identifying significant gaps in safety standards compared to commercial aviation. Due to their lightweight design and limited cabin space, small planes are highly vulnerable during crashes. Experimental tests compared traditional aluminum alloys with advanced composites like carbon fiber and aramid, demonstrating superior impact absorption and cabin protection from the latter. Structural reinforcements such as crushable zones and reinforced fuselages improved survivability. Additionally, energy-absorbing seats combined with advanced restraint systems significantly reduced forces on occupants. Based on these findings, the study recommends adopting composites, structural reinforcements, and enhanced seating systems as standard in small aircraft design, along with updates to crashworthiness regulations.
Korlátozottan hozzáférhető
Analysis of TECNAM P2006t Variable Pitch Propeller System
Uzdil, Mehmet Kaan; Zsolt, Tiba; DE--Műszaki Kar
Comprehensive analysis of Tecnam P06T types propeller system. Explanation of how variable pitch system work and areas of use. Comparing the system with other propulsion systems in the industry. Manufacturing, testing and maintenance proccesses of the system
Korlátozottan hozzáférhető
Application of Crew Resource Management in Commercial Aviation
Mülayım, Tuana; Geza, Husi; DE--Műszaki Kar
This work aimed to deeply analyze the application of Crew Resource Management. It intends to support the development of CRM via covering crew resource management as broadly and comprehensively as possible, including research, information, and reflections on all aspects of crew resource management; in doing so, it aims to examine this subject more comprehensively and in greater detail than it is currently addressed, as well as to provide resources for future studies.With the information, facts, research, analyses, and opinions in this work, it is intended to give a visionary aspect.This thesis analyzes the application of CRM in commercial aviation while exploring the role of it in enhancing aviation safety, assesses its background and its position in commercial aviation.
Korlátozottan hozzáférhető
Augmented Reality and Artificial Intelligence in the field of Aviation
Mendygaliyev, Nurlan; Erdei, Timotei; DE--Műszaki Kar
This thesis focuses on the implementation of artificial intelligence and augmented reality in the field of aviation, focusing on human fatigue detection systems. An overview of existing appliances in various spheres, including aviation, is given and analyzed. A basic human fatigue detection system based on real-time object detection was developed. However, it lacks accuracy due to one-step detection procedure, which is crucial in aviation, where high standards of safety are vital. Overall, there are promising opportunities for such technologies to enhance aviation safety, and therefore they should be applied first in flight simulators for testing.
Korlátozottan hozzáférhető
Human Factors and Analysis of Aviation Education Content of Commercial Pilots
Sana, Muhammad Raheel; Geza, Husi; DE--Műszaki Kar
An analysis about the importance of human factors in aviation, how they correlate to safety culture and how their incorporation in training program could lead to better performing and well versed pilots.
Korlátozottan hozzáférhető
Investigation of Noise Reduction Techniques in Aircraft Engines
Manono, Allan Nyaanga; Husi, Geza; DE--Műszaki Kar
This thesis studies noise reduction techniques for aircraft engines, particularly emphasizing the high-bypass turbofan engines. Aiming to be in line with international efforts to address environmental problems, this study focuses on the persistent issue of aircraft noise pollution in communities that are surrounded by airports. Technology evaluation is systematically performed through a thorough literature review and sound pressure level measurements. The scientific research found that the high bypass ratio (HBP) engines were effective in decreasing noise due to the great airflow mixing and less exhaust velocities. Technological breakthroughs consisting of chevrons, offset nozzles, swept and leaned stators, FFDs and so on are deeply studied. The methods of Chevrons and FFDs were shown to have an immediate impact on the level of noise, with potential reduction of up to 3 effective perceived noise decibels (EPNdB). The research finds that although each technology has its own advantages, the use of the combination of these methods can probably be the most effective approach to reduce airplane engine noise. This integrated approach would be part of meeting tighter regulations on noise and improving the quality of life of adjacent airport communities without compromising engine performance and economy. More studies are suggested to achieve the best settings of these technologies under different engine types and operation conditions
Korlátozottan hozzáférhető
Maintenance of Aircraft
Khan, Mohammed Imroz; Menyhárt , József; DE--Műszaki Kar
Something like aircraft is the heart of air travel, and Flight Maintenance is an arm of aviation safety and operational reliability at cost. With the continuous growth and modernization of the aviation industry, the need for high-quality, ontime, and regulatory-compliant maintenance service has only increased. Thanks to its skilled labor, EASA conformity and relatively low operational costs, Hungary has turned into an up-and-coming Maintenance, Repair and Overhaul (MRO) centre in Central Europe. A Thesis of Aircraft Maintenance in Hungary: Tourism, tourism centres and initiatives, business impact It is especially focused on major MROplayers Aeroplex of Central Europe and Lufthansa Technik Budapest and on the influence of low-cost carriers e.g. Wizz Air on maintenance policy. Using a mixedmethods approach based on the analysis of secondary data, a review of regulatory policies, and simulation-based evaluation, the study identifies supply- side constraints including challenges related to workforce shortages, regulatory burden, and the availability of training programs. The study also looks into prospects related to technology progress, predictive maintenance systems, and global collaboration. The results indicate that although Hungary has the basic ingredients of a competitive aircraft maintenance, repair, and overhaul (MRO) sector, strategicinvestment in training, hardware, and policy support will be needed for this sustainable growth to materialize. Final observations are presented in the form of practical recommendations, which strive to increase the purpose of the country for the needs of the European and global systems of air maintenance
Korlátozottan hozzáférhető
Human factors of pilots in aviation safety
Hossam Anwer Hassan Dagher, Saher; Menyhart , Joszef; DE--Műszaki Kar
Human factors in commercial aviation have become ever more significant over time. It is widely acknowledged that pilots' human factors, not technical issues, are typically at the root of aviation incidents and mishaps. Realizing this need has underscored the significance of creating a specific field of study focused on understanding human potential and constraints so as to design human- machine systems that prioritize efficiency and safety. This knowledge base's primary purpose is to assess and improve the efficiency and safety of aviation operations.
Korlátozottan hozzáférhető
AVIATION SAFETY, IN THE PAST, PRESENT AND FUTURE
ALZUBAIDI, SARAJ; MENYHART, JOZSEF; DE--Műszaki Kar
This thesis explores the evolution of aviation safety from historical foundations to modern and future challenges, emphasizing human factors, technical innovations, and regulatory frameworks. A significant portion focuses on pilot behavior, risk perception, and decision-making, using both historical accident data and theoretical models. I conducted an original student-led survey targeting pilot trainees at PHARMAFLIGHT, analyzing how current flight organizations manage workplace risk and safety procedures. The research identifies a gap between perceived and actual risks among pilots and highlights the critical role of training and corporate culture in influencing pilot decisions. Through scenario-based analysis, I evaluated how pilots respond to conflicting safety, economic, and productivity pressures during high-stakes flight situations. The work concludes by proposing enhanced risk mitigation strategies, combining structural aircraft design, safety-centered training, and system-based decision support tools, reflecting my direct contribution to understanding and improving aviation safety from a student pilot's perspective.
Korlátozottan hozzáférhető
Enhancing Safety Measures in Aviation: Challenges, Innovations, and Future Directions
Singh, Mahinder; Menyhárt, József Dr.; DE--Műszaki Kar
The thesis investigates the critical importance of aviation safety and explores historical, current, and emerging challenges in the field. It identifies human factors, regulatory complexity, and technological limitations as persistent threats to safe aviation operations.Safety culture, organizational behavior, and proactive safety management systems are emphasized as vital pillars for mitigating risks.The study highlights the role of international regulatory bodies like ICAO, FAA, and EASA in shaping safety standards and compliance frameworks.Technological advancements such as AI, automation, and predictive analytics are discussed as game changers in modern safety practices.The thesis includes case studies showcasing global best practices and lessons learned from successful safety initiatives.Training and human factors are analyzed as core components in reducing errors and fostering a resilient safety culture. Methodologically, the research uses both quantitative and qualitative approaches to analyze safety data and stakeholder perspectives.Based on findings, the thesis provides actionable recommendations for industry stakeholders to enhance safety performance.It concludes by advocating for a future-focused, collaborative approach to safety that embraces innovation, regulation, and continuous improvement.
Korlátozottan hozzáférhető
Comparative analysis of aircraft wing profiles
Badrakh, Oyunzaya; Telepoczki, Zoltan; DE--Műszaki Kar
The thesis “Comparative Analysis of Aircraft Wing Profiles” explores how different airfoil shapes affect lift and airflow using 2D simulations in MATLAB’s CFDTool. It focuses on the NACA 2412 airfoil tested at various angles of attack to study aerodynamic behavior and stall. The research is grounded in aerodynamic theory, including Bernoulli’s principle and wing geometry. Results showed varying lift performance among profiles and highlighted the limits of simplified simulations. Despite using basic tools, the study offers useful insights for future aerodynamic design and analysis.
Korlátozottan hozzáférhető
Improving Training in Aviation Education System
Agarwal, Aditya; ERDEI, Timotei István; DE--Műszaki Kar
This thesis studies the use of more advance technologies specifically focusing Virtual Reality (VR), Augmented Reality (AR), and Full Flight Simulators (FFS) to improve the effectiveness of the aviation education systems. Inconsistent training standards, skyrocketing costs and the need for resilience in sectoral processes, especially after the COVID-19 pandemic, presents a challenge for global air transport system
Korlátozottan hozzáférhető
Maintenance of Aircrafts: Using Technology Based Solutions, Artificial Intelligence & Blockchain Technology
Kotoor, Nikhil; József, Menyhárt; DE--Műszaki Kar
This thesis seeks to critically examine how combining artificial intelligence (AI), and blockchain technology into the aircraft maintenance will revolutionize safety, efficiency, and reliability in the aviation sector.
Korlátozottan hozzáférhető
Pathways to Sustainable Aviation: Strategies and Comprehensive Analysis
Bas, Muhammed Safa; Kocsis, Dénes László; DE--Műszaki Kar
This thesis explores various strategies for achieving sustainable aviation in response to growing environmental concerns and the aviation industry's contribution to global CO₂ emissions. It evaluates alternative fuels, including biofuels, synthetic fuels, and hydrogen, highlighting their potential and limitations. The study also examines emerging technologies such as electric and hybrid aircraft, as well as unconventional designs like blended wing bodies and bio-inspired structures. In addition to technological innovations, the research emphasizes the importance of operational improvements and the integration of other transport systems, such as high-speed rail, to reduce aviation's environmental impact. The findings suggest that no single solution is sufficient; instead, a combination of approaches is necessary. Collaboration among governments, industry, and researchers is essential to realize a more sustainable and efficient future for air travel.
Korlátozottan hozzáférhető
Morphing Airfoil Design for Enhanced Aerodynamic Performance
Chaafi, Melek; Abdullah, Masuk; DE--Műszaki Kar
This thesis investigates the design and evaluation of a morphing airfoil mechanism to improve aerodynamic performance over a wide range of flight regimes. The proposed design uses a cable-driven mechanism attached to a cylindrical actuator and a double-pulley system to achieve the ability to actively change its shape. The application of this mechanism would be increased lift during takeoff, decreased drag during cruise, and improved stability during descent. This study is focused on a NACA0012 airfoil profile, the deflection angle and angle of attack are varied and its effect on aerodynamic forces, pressure distribution and flow characteristics are analysed using computational fluid dynamics (CFD) in Ansys Fluent. Static material choices for the mechanism consist of CFRP (Carbon Fiber Reinforced Polymers) for flexibility / strength ratios for the airfoil outer skin, and Dyneema cables due to their high tensile and fatigue properties. Results show a prodigious effect of morphing mechanism on aerodynamic efficiency, which is possibly used in commercial aircrafts, UAVs and experimental aviation. Despite the auspicious results, including challenges around scale and 3D aerodynamic complexities still to be solved. This work advances the research field of adaptive airfoil technology with implications for future sustainable, efficient aerospace engineering.

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