Master Degree / Yüksek Lisans Tezleri

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

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Access Right: Open AccessSubject: search.filters.subject.Mechanisms

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  • Master Thesis
    Function Synthesis of 2-Loop And/Or 2-Dof Mechanisms
    (01. Izmir Institute of Technology, 2023) Bağdadioğlu, Barış; Kiper, Gökhan
    Kinematic synthesis problems are important in mechanism and machine science. This thesis focuses on function synthesis. The synthesis of different mechanisms with 1 and 2 degrees-of-freedom (dof) are issued by using least squares and Chebyshev approximations. There are various studies with these approaches in the literature. However, there are not many studies of function synthesis of 2-dof mechanisms in the literature. The aim is to study function synthesis of 2-loop and 2 dof mechanisms. 2-dof planar 5R mechanism, 1-dof Bennet 6R mechanisms, 2-dof 7R double-spherical mechanism and finally 7R planar 2-dof mechanism are worked out for function synthesis. It is shown that the function synthesis problems can be solved analytically and semi analytically. The formulations are applied using MS Excel and the results were verified using Solidworks software. It is seen that the numerical results give reliable results and construction parameters are successfully determined.
  • Master Thesis
    A Study on the Use and Design of Mechanisms in Art and Architecture
    (Izmir Institute of Technology, 2020) Maral, Mesude Oraj; Korkmaz, Koray
    This study consists of research on developmental processes, fundamentals, kinematic properties, and design methods of art and architectural examples that involve mechanisms and a proposal of a novel method of designing polygonal deployable surfaces. The effect of motion studies on art and architecture is analyzed from the first technical studies of motion and portable examples of architecture. The pre-industrial automata, acoustic designs, musical instruments, water-lifting devices, and aqueducts were designed by artists and architects as well; windmills that are the first rotating structures, clocks, clock towers, construction machines and early examples of movable bridges are examined. The kinematic properties and fundamentals of mechanisms are analyzed. The kinematic structural analyses of contemporary art and architectural products are conducted by drawing kinematic diagrams, demonstrating link and joint types and numbers; and mobility calculations. The primary units and assembly methods of them are examined. Strengthening the bond among the fields of kinetic architecture, art and mechanism science is intended. The present study is the first source in which examples from the related fields and corresponding kinematic science are explicitly transmitted for artists and architects. Finally, a novel design method for polygonal deployable surfaces that is adaptable to climatic, functional, visual and/or social needs is developed. The method starts with the kinematic design of the triangular primary unit, which is topologically Bennett's plano-spherical mechanism. The planar position provides covering surfaces, while the spherical linkage generates a 3D dynamic form during movement. The design is adapted to polygons and multiplied in Archimedean tilings. A single actuator can drive all designs. The modularity provides designs versatility and flexibility.
  • Master Thesis
    Design Modification of a Front Window Mechanism for the Cabin of an Earth Moving Machine
    (Izmir Institute of Technology, 2017) Jovichikj, Radomir; Kiper, Gökhan
    This thesis study investigates the front window mechanism used in an earth moving machinery. Since the mechanism is actuated by the operator, the required actuation force for the mechanism needs to be as minimum as possible. The problem of this thesis is defined by Turkey branch of Mecalac Company and the final test of this study are performed in their facility. First, the problem definition and aim of the study is presented. Furthermore, the literature review is also presented. Then, the current mechanism attached on the earth moving machinery is investigated. Firstly, kinematic analysis is performed in order to be able to perform the force analysis. Following that, using three different approaches (Newton-Euler approach, virtual work method and graphical approach), the static force analysis is done. The aim of this analysis to obtain the required actuation force, both for opening and closing the mechanism. By using three different approaches, the result obtained after each method are compared and confirmed. Furthermore, a simulation of the mechanism is prepared in MATLAB/Simulink® environment. This step provided a numerical simulation verification for the resulting actuation forces. Then the work carried out for the minimization of the actuation force is presented. By changing the parameters of the springs attached on the current mechanism, changing the link lengths of the mechanism and changing the application point of the actuation force, the change in the magnitude of the required actuation force is observed and minimized. Among all trials, only changing the spring position led to useful results. Finally, the test setup to measure the performance and experimentally verify the proposed solution is explained and the results are given. The results show that with the modified location of the spring, both of the maximum force requirements and the work requirements are lowered.