Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Analysis of Electromechanical Behavior of Piezoelectric Smart Curved Beams(Izmir Institute of Technology, 2017) Aras, Tunç; Yardımoğlu, Bülent; Yardımoğlu, BülentIn this study, electromechanical behavior of piezoelectric smart curved beam with variable radius of curvature is investigated using Finite Element Method. Firstly, a background of beam theories is provided as well as a discussion on the history of piezoelectric materials and the development of smart beams and smart curved beams. The deformations of curved beams, the differential equations for in-plane bending of curved beam with and without piezoelectric patch are presented. Finite element modeling of smart curved beam is done using ANSYS. The mesh size correctness and numerical accuracy is controlled by an equivalent straight cantilever beam having the same length, cross-section and loaded from its tip with the same amount of force that will be applied to the curved beam model. Tip displacement comparisons are done using an analytical and finite elements approach. The model is verified by comparing the analytical results of piezoelectric constitutive equations with results of finite elements method for a rectangular prism shaped piezoelectric patch. After the verification is complete, the consequent tip displacements on x direction and generated electric fields are observed after the loads of different magnitudes applied to the tip of piezoelectric curved beam. Finally, results are discussed.Master Thesis Dynamic Modelling and Analysis of Elevator Systems(Izmir Institute of Technology, 2016) Berber, Onur; Yardımoğlu, BülentCities began to grow unexpected size after the industrial revolution. Then, so many new problems like public health, transportation, housing, food requirement etc appeared. Those problems initiated new scientific fields. Engineering diciplines also solved some of those problems and also provided many benefit to people. Different approaches at elevator technology were effected by requirements such as hight travel distances and high load capacities. If the new elevators are compared with the old elevators, it is seen that new ones are more silent, faster, safer and even more efficient. Although the elevator technology goes further and further, its applications become more complex. In this study, in order to find the transient time response of elevator car of the most common elevator types, finite element models of them are developed in ANSYS by using APDL (ANSYS Parametric Design Language). In the analysis, acceleration and deceleration of elevator car are used as input parameters. Time response plots of elevator car are presented.Master Thesis Dynamic Analysis of Non-Circular Curved Beam Subjected To Moving Loads(Izmir Institute of Technology, 2017) Emre, Melih; Yardımoğlu, BülentIn this thesis, analysis of the dynamic responses of non-circular curved beams subjected to moving loads is studied by using ANSYS which is Finite Element software. An APDL (ANSYS Parametric Design Language) code is developed for a parabolic curved beams having fixed-fixed boundary conditions. The moving load is acted on the curved beam as a single load with constant speed during the movement of the load. First of all, the proper number of finite element used in the developed APDL code for curved beam is determined by convergence test. In order to verify the mass and stiffness matrices of the curved beam, natural frequencies are found and compared with the results available in the literature. Then, moving load algorithm used in the developed APDL code is validated by using a straight beam model which has exact solution. After validations, static deflections of curved beam under slowly moving load and dynamic deflections under moving load are presented. Finally, discussion of numerical results are given.Master Thesis Modal Analysis of Aerofoil Cross-Sectioned Wing Made of Laninated Composite and Filled With Foam(Izmir Institute of Technology, 2015) İskeçe, Barış; Yardımoğlu, BülentModal analysis of aerofoil cross-sectioned wing made of laminated composite and filled with foam is studied by Finite Element Method with the help of ANSYS which is very powerful and well proven software all around the world. The effects of ratio of overhangs to mid-span and length of the thickened parts on natural frequencies are investigated by finite element models developed in ANSYS and the model is verified by theoretical results available in the literature.