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Mekatronik Mühendisliği Bölümü Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/3430

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Browsing Mekatronik Mühendisliği Bölümü Tezleri by Author "Mekatronik Mühendisliği"

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    Master Thesis
    Design and implementation of control algorithms for stabilization of rotary inverted pendulum
    (2019) Şen, Fatma Nur; Mekatronik Mühendisliği
    Rotary Inverted Pendulum is a popular test-bed in control theory applications as it has a nonlinear characteristics and unstable structure. To drive the pendulum to upright position and holding the stick of the pendulum stabilized in that condition is one of the important benchmark problems in control theory. Generally, the control structure of this system consists of two modes. The first mode is known as the swing up mode where the pendulum is brought into nearly upright position from a stand still downward orientation. The second control mode is called as hold mode and it switches the swing up mode when the pendulum is in an epsilon neighborhood of the upright position and its aim is to stabilize the pendulum and keeping it motionless at this condition. The intention in this thesis is developing hold mode control structures integrating the State Feedback Control, Routh Hurwitz method and Genetic Algorithms. Keywords: Rotary Inverted Pendulum, Genetic Algorithm, State Feedback, Routh Hurwitz, Multi Criteria Optimization.
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    Article
    Citation - WoS: 17
    Citation - Scopus: 16
    Influence of welding on microstructure and strength of rail steel
    (Elsevier Sci Ltd, 2020) Sarikavak, Yasin; Çoğun, Can; Turkbas, Osman Selim; Cogun, Can; 3837; Mekatronik Mühendisliği
    In this study, metallurgical and mechanical aspects of cold flash butt welded rail joints were investigated. The relationship between the material characteristics and the distance to the fusion line were evaluated. Significant changes observed in grain size as it ranges 2-8 according to ASTM E 112. Hardness tests conducted and the average results of the rail head, web, and foot were recorded. According to the results, three different zones were identified including the fusion line, recrystallization zone, and transition areas. Tensile properties and strength characteristics have been investigated for the specified zones separately. Obtained experimental values were used as input parameters for the developed finite element model (FEM) to calculate stress distribution. The welded rail was subjected to realistic wheel load and stress distributions in weld were evaluated. The developed model has also been validated by comparing the theoretically obtained stress values with the experimental ones under various loading conditions. (C) 2020 Elsevier Ltd. All rights reserved.