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Öğe An Alternative Draft Sensing System Designed for Electro-Hydraulic Lifts Used on Tractors(Duzce University, 2024) Uymaz, Gökay; Uymaz, BaharThe performance of tractor hydraulic lifters is largely determined by the lifting capacity and the precision of the draft sensing system. As can be understood from the long-standing applications on the subject, the draft sensing systems in mechanical-hydraulic draft sensing systems are multi-part and complex. Electro-hydraulic draft sensing systems, while relatively simple, contain expensive and specialized electronics such as load pins and electronic control units. In addition, in order for the load pin to be applied to the system, the hydraulic lifter body and the reaction support must be designed as separate parts and combined with the load pins and some other connecting sub-parts. Special electronic components and a complex multi-part design were identified as a problem to be improved. In this study, an alternative design that can be easily adapted to various tractors and provide the same function without loss of function has been proposed instead of the existing load pins in electro-hydraulic draft sensing systems used in tractor hydraulic lifters. This alternative system, in which the lifter body and reaction support are integrated in one piece instead of the multi-piece design, is presented as an advantage in the design. In the study, the most suitable point to be applied for the new design on the reaction support was determined by finite element (FEA) analysis. The new design has been applied to the hydraulic lifter test rig and has been experimentally tested to verify its functionality. The results confirm the practicality and reliability of the new design.Öğe AVRUPA BİRLİĞİ BAĞLAMINDA YÜKSEKÖĞRETİMDE KALİTE(Trakya Üniversitesi, 2023) Uymaz, BaharYükseköğretimde uluslararası hareketlilik ile öğrenci ve öğretim elemanları kültürlerarası paylaşımın birer aracı olmakta ve bu hareketlilik öğrenci açısından ele alındığında öğrencilerin uluslararası bilgi akışına katılması, yeni fikirlere ya da teknolojilere maruz kalması, öğretim elemanı açısından ele alındığında ise öğretim elemanlarının iki ülke arasında ortaya çıkabilecek proje ve araştırma faaliyetlerine adım atmaları ve bu faaliyetler yoluyla toplumsal sorumluluk çalışmalarını uluslararası boyutta gerçekleştirebilmeleri gibi birçok amaca hizmet etmektedir. Değişim programlarında araştırma ve öğretim faaliyetleri ve bununla ilgili tüm süreçlerin yükseköğretim kurumunda belirli standartlara ulaşılmasında rolünün olması uluslararasılaşma ve yükseköğretimin kalitesi kavramları arasında doğrudan bir bağlantı kurulmasına neden olmaktadır.Öğe Buckling Characteristics of FGM Plates Subjected to Linearly Varying In-Plane Loads(Springer, 2021) Uymaz, BaharThe critical buckling load for a FGM plate under a linearly distributed in-plane load is determined. Material properties of the plate vary exponentially across its thickness. The Ritz method is used to solve the equations formed according to the 3D linear elasticity theory. The effects of different material compositions and dimensions of the plate on its critical buckling load and mode shapes are investigated for three different boundary conditions. © 2021, Springer Science+Business Media, LLC, part of Springer Nature.Öğe Forced vibration analysis of functionally graded beams using nonlocal elasticity(Elsevier Sci Ltd, 2013) Uymaz, BaharA forced vibration analysis of functionally graded (FG) nanobeams is considered based on the nonlocal elasticity theory. The solution is obtained by using Navier method for various shear deformation theories. The material properties of the FG nanobeam vary through the thickness direction according to a simple power law. Effects of the nonlocal parameter, different material composition and length-to-thickness ratio of considered element on the vibration and the effect of frequency ratio and different dynamic loading conditions on dimensionless maximum deflection and mode shapes of FG nanobeam are investigated. As a result the dynamic behavior of the FG nanobeam is influenced by the nonlocal effects. The dynamic deflections obtained by the classical (local) theory are smaller than obtained by the nonlocal theory due to the nonlocal effects. (C) 2013 Elsevier Ltd. All rights reserved.Öğe Forced vibration analysis of functionally graded beams using nonlocal elasticity (vol 105, pg 227, 2013)(Elsevier Sci Ltd, 2014) Uymaz, Bahar[Abstract Not Available]Öğe Three dimensional mechanical buckling of FG plates with general boundary conditions(Elsevier Sci Ltd, 2013) Uymaz, Bahar; Aydoğdu, MetinThe mechanical buckling analysis of rectangular functionally graded plates under different axial loadings is considered. The analysis is based on the small strain elasticity theory with different boundary conditions. The material properties of the plate vary through the thickness direction according to a simple power law. Three dimensional buckling solutions are obtained using the Ritz method with Chebyshev polynomials as assumed displacement functions. The convergence and comparison studies are presented and effects of the different material composition and the plate geometry (side-side ratio, side-thickness ratio) on the critical buckling loads and mode shapes are investigated. (c) 2012 Elsevier Ltd. All rights reserved.Öğe Three dimensional shear buckling of FG plates with various boundary conditions(Elsevier Sci Ltd, 2013) Uymaz, Bahar; Aydoğdu, MetinIn this paper, the buckling of functionally graded plates under shear are considered for various boundary conditions. The buckling results obtained by using Ritz method based on the three-dimensional linear elasticity theory and the higher order shear deformation theories. The material properties of the plate vary through the thickness direction according to a simple power law. The comparison results are presented and the variation of the critical shear buckling load and the critical shear buckling modes with the shear buckling characteristics like the material composition, the plate geometry parameters (side-side ratio, side-thickness ratio) are investigated. (C) 2012 Published by Elsevier Ltd.Öğe Three-Dimensional Thermal Vibration of CFFF Functionally Graded Carbon Nanotube-Reinforced Composite Plates(Springer, 2023) Uymaz, Bahar; Uymaz, GökayPurpose: Three-dimensional thermal vibration analysis of functionally graded carbon nanotube (FG-CNT) reinforcement composite plates is performed for uniform, linear and sinusoidally temperature distribution. Methods: The reinforcement directions is considered through the thickness according to four reinforcement models as UD, FG-V, FG-O and FG-X are examined. As the components of the composite, the material properties of both the CNT forming the reinforcement phase and the polymer forming the matrix phase change depending on the temperature, and this is the focus of this study. The effective material properties of the FG-CNT reinforced composite are determined by the mixtures rule. The three displacements of the plates are expanded by a series of Chebyshev polynomials multiplied by appropriate functions to satisfy the essential boundary conditions. The natural frequencies are obtained by the Ritz method. Results: It is shown that the numerical results of the current approach are compared with the results of other researchers for validation, the results appear to be in good agreement. The effects of the thickness-to-length ratio and different volume fraction distributions for cantilever (CFFF) boundary conditions in considered thermal environments are investigated. The effect of different boundary conditions such as clamped (CCCC), simply supported (SSSS), simply supported through the x-axis and clamped through the y-axis (SCSC) and simply supported through the x-axis and free through the y-axis (SFSF) is also examined. It is shown that the increase in the amount of temperature and the type of temperature distribution are effective on the decrease of frequencies. © 2023, Krishtel eMaging Solutions Private Limited.Öğe Three-dimensional vibration analyses of functionally graded plates under various boundary conditions(Sage Publications Ltd, 2007) Uymaz, Bahar; Aydoğdu, MetinThree-dimensional vibration solutions are presented for rectangular functionally graded plates with different boundary conditions, based on the small strain linear elasticity theory. The material properties are assumed to vary as a power form of the thickness coordinate. The Ritz method with Chebyshev displacement functions is used to solve the vibration problem of functionally graded plates. The convergence and comparison studies demonstrate the accuracy and correctness of the present method. The effects of aspect and thickness ratios, and gradient index, on the free vibration frequencies are investigated. Some results are given in the form of tables and figures, which can serve as the benchmark for further research.Öğe Vibration analyses of FGM plates with in-plane material inhomogeneity by Ritz method(Elsevier Sci Ltd, 2012) Uymaz, Bahar; Aydoğdu, Metin; Filiz, SeçkinIn this study, functionally graded plates which the properties of material varying through the in-plane direction is considered. The analysis is based on a five-degree-of-freedom shear deformable plate theory with different boundary conditions. The vibration solutions are obtained using the Ritz method and assumed displacement functions are in the form of the Chebyshev polynomials. The material properties are assumed to vary as a power form of the in-plane direction. The convergence and comparison studies demonstrate the accuracy and correctness of the present method. Effects of the different material composition, the Poisson ratio and the plate geometry (side-side, side-thickness) on the free vibration frequencies and mode shapes are investigated. (C) 2011 Elsevier Ltd. All rights reserved.Öğe Vibration of CFFF Functionally Graded Plates with an Attached Point Mass at an Arbitrary Point in Thermal Environment(Springer, 2022) Uymaz, BaharPurpose: In many cases, working on models such as carrying a point attached mass or distributed attached mass provides a more realistic depiction of the problem. The main reason for the vibration studies of the structural elements with coupled mass, which constitute the main purpose of this study, is to see the changes in the resonance frequency due to the attached mass and to reduce the resonance frequency to a desired value. Although the vibration problems of mass-loaded rectangular plates are a very common problem in engineering applications, no study on functionally graded plates has been found in the literature. In this study, the effect of the variation of temperature-dependent material properties along the thickness according to a simple power law on the vibration behavior of point mass carrying functionally graded plates is investigated for the cantilever (CFFF) boundary condition. Numerical studies are performed for different mass ratio (M), different location of point mass on the plate region and throughout the x axis, volume fractions with p and side-to-side ratio (a/b) at nonlinear temperature distribution. Methods: In this study, effect of the mass and temperature on free vibration of the functionally graded plate carrying a point mass at an arbitrary position is analysed with three-dimensional Ritz solution. Material properties of considered functionally graded plate are assumed to be temperature dependent and reinforcement in thickness direction according to a power law distribution and effective material properties are estimated using Mori-Tanaka homogenization method. Results: Free vibration frequencies decrease with increasing p index and increasing temperature difference. The frequencies obtained in the case of with point mass are always smaller than the frequency values obtained in the case of without point mass. When the point mass is located on a nodal line, the mass does not move during these and so frequency remains constant as independent of the presence of mass. If the mass is located on the nodal lines, at these frequencies it will resonate at the natural frequency of the unperturbed plate. Conclusion: The study shows that the effect of the presence of added mass, mass size and location on structures may not be negligible. © 2022, Krishtel eMaging Solutions Private Limited.
