Master Degree / Yüksek Lisans Tezleri

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

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Subject: search.filters.subject.Vibration--Testing

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Now showing 1 - 5 of 5
  • Master Thesis
    Vibration Analysis of Laminated Composite Circular Plates With Radial Slots
    (Izmir Institute of Technology, 2014) Baltacı, Çetin Özgür; Yardimoğlu, Bülent
    Vibration characteristics of laminated composite annular circular plates with radial slots are studied by Finite Element Method (FEM). As theoretical background, vibration analysis of orthotropic annular circular plates, mechanics of laminated composites and finite element modeling are summarized. Laminated composite annular circular plates with radial slots are introduced. The APDL program in ANSYS is developed for the titled problem and verified by the available literature for the annular circular plate. Then, the effects of lamination parameters on natural frequencies are investigated.
  • Master Thesis
    Random Vibration of a Road Vehicle
    (Izmir Institute of Technology, 2010) Bayrakdar, Özgür; Yardımoğlu, Bülent
    In this study, considering four different car models, random vibration characteristics of a road vehicle are investigated by using Mathematica. A road vehicle is modeled as quarter car, half car, and bicycle car. Natural frequencies of each model are found in first step. Then, responses to harmonic and random base excitation for each models are determined. The accuracy of the developed programs for different car models in Mathematica is evaluated by comparing the natural frequencies available in the literature. The effects of modeling approach on natural frequencies and response to harmonic and random base excitation are obtained. The results are presented in graphical and functional forms.
  • Master Thesis
    Vibration Characteristics of Portal Frames
    (Izmir Institute of Technology, 2013) Tatar, İlhan; Yardımoğlu, Bülent
    This research study deals with the defining of dynamic behaviors of a portal frame structure with tapered members by using Finite Element Method (F.E.M.) and experimental modal analysis. Portal frame with three beam members is used in this study. Frame structure is composed by two tapered and one uniform cross sectioned beams. The first part of thesis is about the finite element modelling of the model which is developed in ANSYS. Theoretical modal analysis to find the natural frequencies and mode shapes of the frame is performed by using the finite element model. The second part of thesis is experimental modal analysis of the frame under study. For this purpose, the experimental modal test setup has been established. The modal parameters found from both numerical and experimental methods are compared and good agreement is found.
  • Master Thesis
    In-Plane Free Vibration Analysis of Laminated Curved Beams With Variable Curvature
    (Izmir Institute of Technology, 2013) Çangar, Fatma; Yardımoğlu, Bülent
    In this study, in plane free vibration characteristics of laminated curved beams with variable curvatures are studied. The present problem is modeled by differential eigenvalue problem with variable coefficients. FDM (Finite Difference Method) is used to solve the differential eigenvalue problem. A computer program is developed in Mathematica and this program is verified by using results available in the literature. The effects of curvature and lamination parameters of the curved beams 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, Bülent
    In 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.