Yardımoğlu, Bülent
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Yardimoglu, B.
Yardimoglu, B
Yardimoǧlu, Bulent
Yardımoğlu, B
Yardımoğlu, B.
Yardimoglu, Bulent
Yardimoǧlu, B.
Yardimoglu, B
Yardimoǧlu, Bulent
Yardımoğlu, B
Yardımoğlu, B.
Yardimoglu, Bulent
Yardimoǧlu, B.
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03.10. Department of Mechanical Engineering
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Former Staff
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12
Citations
173
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6
This researcher does not have a WoS ID.
Scholarly Output
40
Articles
7
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57645/23028
Supervised MSc Theses
30
Supervised PhD Theses
1
WoS Citation Count
140
Scopus Citation Count
169
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0
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1
WoS Citations per Publication
3.50
Scopus Citations per Publication
4.23
Open Access Source
38
Supervised Theses
31
| Journal | Count |
|---|---|
| Shock and Vibration | 4 |
| Journal of Sound and Vibration | 3 |
| 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2009 | 1 |
| Finite Elements in Analysis and Design | 1 |
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40 results
Scholarly Output Search Results
Now showing 1 - 10 of 40
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 Free Vibration Analysis of Curved Beams With Variable Cross-Sections on Elastic Foundations(Izmir Institute of Technology, 2013) Yazıcı, Ümit Okan; Yardımoğlu, BülentFree out of plane vibration characteristics of curved beams with variable cross-sections on elastic foundations are studied by TMM (Transfer Matrix Method) since the mathematical model of the present system based on the coupled differential eigenvalue problem with variable coefficients which can not be solved easily by exact methods. Vibrations of beams on different elastic foundations are reviewed. Out of plane vibration of curved beams on different elastic foundations are investigated. TMM is detailed with its applications to vibration problems. To solve the vibration problems, TMM is examined with several computer programs developed in Mathematica. The accuracy of the TMM results obtained from the developed program is evaluated by comparing with FEM results found from model created in ANSYS. Finally, the effects of the variation of cross-section of the curved beams and elastic foundation parameters on natural frequencies are investigated.Master Thesis In-Plane Vibrations of Curved Beams Having Variable Curvature and Cross-Section(Izmir Institute of Technology, 2009) Kara, Ali; Yardımoğlu, BülentIn this study, vibration characteristics of curved beams having variable curvatures and cross-sections are investigated. For convenience and progressive requirements, vibration characteristics of curved beams having; constant curvature and cross-section, variable curvature and constant cross-section, constant curvature and variable cross-section are also examined. The governing differential equations have derivatives with variable coefficients except for constant curvature and cross-sectioned case. Due to the fact that the solutions of differential equations with variable coefficients are analytically impossible except for special combinations of coefficients, in the investigation of eigenvalues of differential equations with variable coefficients usage of a numerical solution technique becomes necessary. At this point, the Finite Difference Method (FDM) is used to have the eigenvalues by converting continuous eigenvalue problem into discrete eigenvalue problem. Numerical solutions of the equations of motion with variable coefficients based on Finite Difference Method are carried out by using a symbolic program developed in Mathematica. The accuracy and numerical precisions of the developed program are evaluated by comparing the results with the analytical results given in literature. Good agreement is obtained in the comparisons of the present results with analytical results given in tabular form. Then, the effects of selected taper and curvature functions of beams on natural frequencies are found. The results are presented in tabular and graphical forms.Master Thesis Vibration Analysis of Pre-Twisted Rotating Beams(Izmir Institute of Technology, 2003) Yıldırım, Tolga; Yardımoğlu, BülentA new linearly pretwisted rotating Timoshenko beam element, which has two nodes and four degrees of freedom per node, is developed and subsequently used for vibration analysis of pretwisted beams with uniform rectangular cross-section. First, displacement functions based on two coupled displacement fields (the polynomial coefficients are coupled through consideration of the differential equations of equilibrium) are derived for pretwisted beams. Next, the stiffness and mass matrices of the finite element model are obtained by using the energy expressions. Finally, the natural frequencies of pretwisted rotating Timoshenko beams are obtained and compared with previously published both theoretical and experimental results to confirm the accuracy and efficiency of the present model. The new pretwisted Timoshenko beam element has good convergence characteristics and excellent agreement is found with the previous studies.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.Article Citation - WoS: 39Citation - Scopus: 46Finite Element Model for Vibration Analysis of Pre-Twisted Timoshenko Beam(Academic Press Inc., 2004) Yardımoğlu, Bülent; Yıldırım, TolgaA new linearly pre-twisted Timoshenko beam finite element, which has two nodes and four-degrees-of-freedom per node, is developed and subsequently used for coupled bending-bending vibration analysis of pre-twisted beams with uniform rectangular cross-section. First, displacement functions based on two coupled displacement fields (the polynomial coefficients are coupled through consideration of the differential equations of equilibrium) are derived for pre-twisted beams whose flexural displacements are coupled in two planes. This approach helps to reduce the number of nodal variables. Next, the stiffness and mass matrices of the finite element model are obtained by using the energy expressions. Finally, the natural frequencies of pre-twisted Timoshenko beams are obtained and compared with previously published theoretical and experimental results to confirm the accuracy and efficiency of the present model. Excellent agreement is found with the previous studies. Also, the new pre-twisted Timoshenko beam element has good convergence characteristics.Other Citation - WoS: 4Citation - Scopus: 4Exact Solutions for the Longitudinal Vibration of Non-Uniform Rods [j. Sound Vib. 207 (1997) 721-729](Academic Press Inc., 2010) Yardımoğlu, BülentThe aims of this communication are to correct the frequency equation for a free–free rod with area variation A(x)=A0 s in2(ax+b) in a published article [1] and present the corrected non-dimensional natural frequencies.Article Citation - WoS: 8Citation - Scopus: 6Coupled Bending-Bending Vibration of a Pre-Twisted Beam With Aerofoil Cross-Section by the Finite Element Method(Hindawi Publishing Corporation, 2003) Yardımoğlu, Bülent; Inman, Daniel J.The present study deals with a finite element model for coupled bending-bending-torsion vibration analysis of a pretwisted Timoshenko beam with varying aerofoil cross-section. The element derived in this paper has two nodes, with seven degrees of freedom at each node. The nodal variables are transverse displacements, cross-section rotations and the shear angles in two planes and torsional displacement. The advantage of the present element is the exclusion of unnecessary derivatives of fundamental nodal variables, which were included to obtain invertable square matrix by other researchers, by choosing proper displacement functions and using relationship between cross-sectional rotation and the shear deformation. Element stiffness and mass matrices are developed from strain and kinetic energy expressions by assigning proper order polynomial expressions for cross-section properties and considering higher order coupling coefficients. The correctness of the present model is confirmed by the experimental results available in the literature. Comparison of the proposed model results with those in the literature indicates that a faster convergence is obtained. The results presented also provide some insights in the formulation by clearly indicating that higher order coupling terms have considerable influence on the natural frequencies.Master Thesis Vibration Analysis of Rotating Curved Beams With Variable Cross-Section(Izmir Institute of Technology, 2014) Kartav, Osman; Yardımoğlu, BülentIn this study, in-plane free vibration characteristics of rotating curved beams are investigated by Finite Difference Method and Finite Element Method since the mathematical model of the present problem is based on the differential eigenvalue problem with variable coefficients. A computer program regarding the titled problem is developed in Mathematica and this program is verified by using results available in the literature. The effects of taper parameters of the curved beam and rotation speed on natural frequencies are investigated.Master Thesis Noise and Vibration Analysis of a Drum Brake Used in Heavy Commericial Trucks(Izmir Institute of Technology, 2018) Akdağ, Osman; Yardımoğlu, BülentHeavy commercial duty vehicles have been used to for many years. High energy dissipation is required to stop these types of vehicles. Selection of brake type is related with the brake resists to this physical and environment conditions and also comfortability of drivers and passengers. Brake squeal is the most common costumer complaint for brake systems. This problem is main interest and tackled in many ways. In this thesis, vibration characteristics of the heavy commercial duty brake system, which is a drum brake, is studied by Finite Element Method to analyze the brake squeal. Natural frequencies and mode shapes of drum and shoe which are in frictional contact are determined by using ANSYS. Block Lanczos solver is preferred for this analysis. Experimental modal tests are accomplished to compare finite element results with experimental ones. Then, the noise characteristics of the brake system are obtained by performing a series dynamometer tests. In these experiments, four parameters are selected to investigate the decreasing and eliminating the noise. The selected parameters are deceleration rate, pressure, temperature and friction coefficients. The results are presented in tables and graphs.