Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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Author: search.filters.author.Özdemir, SerhanPublisher: search.filters.publisher.01. Izmir Institute of Technology

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  • Master Thesis
    Modelling of an Impact Resistant Navigation System for Gun Projectiles Based on Low Cost Mems Sensors
    (01. Izmir Institute of Technology, 2021) İnel, Selahattin Can; Özdemir, Serhan; Özdemir, Serhan; 01. Izmir Institute of Technology; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering
    In this thesis, guided projectiles are studied in three aspects: a navigation system design, CFD analysis of a guided projectile for low launch velocities and durability of electronic components under extreme firing conditions. During the thesis progress, MATLAB & Simulink, FlightGear and Ansys-Fluent software are used for simulations and 3D object modelling. Basic Finner Reference Projectile is chosen as a test bed for navigation simulation, since the dimensions and some of the flight parameters are already available as open source. However, a missile state-space model which is given by Raytheon is used for navigation simulations instead of a guided projectile model due to inaccessibility of some critical aerodynamic parameters for 6-DoF model. Navigation system is designed using preset guidance methodology which uses built-in inertial sensors to correct the course for given targets which location are loaded prior to launching. CFD calculations of the Basic Finner Reference Projectile are conducted for low launching velocities to light the way for the aerodynamic conditions of non-explosive firing equipments such as catapults and airguns. Furthermore, the durability of common electronic components under extreme projectile firing conditions are visualized up to 20,000g and the functionality of regular off the shelf microcontrollers and sensors are tested using Hopkinson Bar test equipment. A navigation model simulation of a guided munition is created combining FlightGear and MATLAB & Simulink satisfying the given different criteria for pole placement method, LQR controller and observer design.
  • Master Thesis
    Location Independent Band Specific Inductive Temperature and Revolution Sensing Platform
    (01. Izmir Institute of Technology, 2020) Doğan, Oğuzhan; Özdemir, Serhan; Özdemir, Serhan; 01. Izmir Institute of Technology; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering
    The main aim of this thesis is to design and prototype an inductive temperature and revolution sensing platform for the rotary shaft. The power and data are transmitted wirelessly and the transmission is realized in single line which means that there is no need another couple of coils. Wireless power and data transmission are divided into several methods such as capacitive, inductive and etc. In this thesis, inductive transfer is the main theme. Inductive transfer system uses the magnetic field to transfer the power and data and it has many advantages as compared with the capacitive system. One of the advantages is the transmission distance. In inductive transfer system, the distance is in cm scale but in capacitive system, the distance is only in mm scale and it can be said that the copper plates are nearly touched in capacitive system. Due to the reason, inductive method is selected for the power and data transmission. In this thesis, the system consists of two parts which are power and data transmission. In power transmission, class-E power amplifier is used to transmit. Because, it has theoretically 100% efficiency and less power dissipation. Based on the equations, class-E amplifier is designed and implemented on inductive power transfer (IPT) system. As a result of power transmission, 90% efficiency has been achieved and the transmitted power is supplied to the temperature sensor which generates pulses as temperature data. These pulses trigger the MOSFET that is connected in series with the load resistor placed on secondary side. Depending on the status of the MOSFET such as on and off state, the system can be loaded and unloaded status which is called load modulation. By this process, these data pulses are seen on the voltage of primary coil and it is filtered to extract the temperature data. Another objective of data transfer is to measure revolution of the shaft and new method, which is sensorless and based on magnetic flux, is proposed to measure revolution. When the both coils are positioned as vertical, the magnetic flux, which passes through the secondary coil, is maximum but when the shaft is turned as 90 degrees and the secondary coil is positioned as horizontal, the magnetic flux is decreased. These decreasing affects the primary coil voltage. By detecting these difference, the revolution is detected.