Master Degree / Yüksek Lisans Tezleri

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

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  • Master Thesis
    Optimization of Injection Molding Process Parameters for Cycle Time
    (01. Izmir Institute of Technology, 2024) Kaplan, Anıl; Artem, Hatice Seçil
    Plastic, an integral part of modern life, is widely used in various sectors such as automotive, aerospace, and healthcare. The rapid advancements in the plastic industry have improved plastic processing technologies. Among contemporary production methods, plastic injection molding has become one of the most commonly used techniques. As industrial markets evolve rapidly, the need to shorten product cycle times, reduce production costs, and increase production speeds to respond swiftly to demand has become increasingly urgent. In this context, the thesis addresses the reduction of cycle times through the optimization of process parameters in the injection molding process. By utilizing experimental data available in the literature, a mathematical model of the injection molding process has been developed using a hybrid method known as Neuro-regression approach and cross-validation technique. To minimize the cycle time of the injection molding process, multi-objective optimization scenarios were created using seven different process parameters and two parameters affecting product quality. Optimization studies were carried out using stochastic optimization methods with the 'Simulated Annealing,' 'Random Search,' 'Nelder-Mead,' and 'Differential Evolution' algorithms in the 'Wolfram Mathematica' program with the help of the 'NMinimize' tool. When comparing the obtained optimization results with those in the literature, it was found that the model and optimization methods used in the study are reliable and applicable.
  • Master Thesis
    Design and Optimization of Hydraulic Actuator Used in Jet Fighter
    (01. Izmir Institute of Technology, 2024) Denizci, Ahmet; Artem, Hatice Seçil
    Actuators have been used in many areas from past to present. It is an indispensable equipment in the areas of use in today's technology. They are classified according to their usage areas and drive type. Depending on the type of drive, there are hydraulic, pneumatic and electrical actuators. It also has many uses: construction, manufacturing, automotive, robotics and aerospace industries. Hydraulic actuators are frequently used equipment in the aviation industry. In this thesis, the hydraulic actuator rod used in jet fighters was examined. This actuator is used to move the flight control surfaces in the jet fighter. So hydraulic actuator is vital for jet fighters. First, by conducting a literature search, boundary conditions and parameters were determined for actuator design and analysis. The design of rod was made using the determined parameters and the design parameters were analyzed using the finite element method. Neuro-regression approach was used to model a compact, lightweight and durable actuator. After regression analysis, many scenarios were created to optimize the mass and von Mises stress of the rod. The design and optimization of the hydraulic actuator rod were achieved by using Differential Evolution, Nelder-Mead, Random Search and Simulated Annealing algorithms. It has been concluded that the model and optimization algorithms are reliable and applicable to the problem.