Boğaziçi Üniversitesi Tezleri: Recent submissions

  • Design optimization of structures under fatigue loading 
    Ertaş, Ahmet Hanifi. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Many of the engineering failures are caused by fatigue. Fatigue failure can be defined as the tendency of a material to fracture by means of progressive brittle cracking under cyclic stresses. Because mechanical components ...
  • A framework for the analysis of coupled-physics models using adaptive multi-level techniques 
    Turan, Erhan. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    This object of this study is to develop a computational framework to analyze coupled-physics problems within the context of multi-level methods. Adaptive solution strategies in conjunction with Newton-Krylov and Domain ...
  • Gain-scheduled air path system control and compressor air mass flow estimation in diesel engines 
    Atam, Ercan. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    In this dissertation, we deal with the independent problems of air path system control and compressor air mass flow estimation in diesel engines. In this regard, the thesis can be divided into two main parts: control and ...
  • Three-dimensional solution of compressible potential flow in turbomachinery by a finite element method 
    Güneş, Doğan. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1983., 1983.)
    The present study is concerned with the analysis of three-dimensional, compressible flows in axial-, radial-, or mixed-flow turbomachinery under the limitations of steady and potential flow conditions. The basic approach ...
  • Numerical analysis of surface-driven non-isothermal viscoelastic flow 
    Kaptan, Yalın. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    The numerical investigations of the moving edge non-isothermal viscoelastic flows are simulated by using two example problems (lid driven cavity (LDC) and rotating disc in a cylindrical enclosure (RDCE) flows) in this ...
  • Design of composite structures for minumum weight 
    Akbulut, Mustafa. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    The goal of this study is to develop methodologies to optimize the structural design of composite materials to achieve the minimum weight. Mainly three different problem areas were considered. Firstly, weight minimization ...
  • Closed-loop actuator and sensor location selection strategies for flexible structures 
    Güney, Murat. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this thesis, the problem of finding the optimal actuator and sensor locations for vibration control of a flexible structure is studied. An iterative search strategy is used, where the closedloop criteria are selected ...
  • Finite element analysis of plasticity-induced fatigue crack closure 
    Gökçen, Mehmet Gökhan. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Contact elements are implemented into the elastic-plastic finite element analysis of fatigue crack closure to predict crack opening stress, by developing a code using ANSYS Parametric Design Language. Although the use of ...
  • Optimum vibration absorbers for continuous and discrete mechanical systems 
    Tursun, Murat. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this thesis, the optimum parameters of passive vibration absorbers for continuous and discrete mechanical systems are investigated. Two approaches are undertaken to obtain the optimum absorber parameters. The first ...
  • Hydroxyapatite coating on Ti and Ti6A14V substrates by using electrophoretic deposition method 
    Albayrak, Önder. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Electrophoretic deposition method was used to coat hydroxyapatite (HA) on titanium (Ti) and its alloy (Ti6Al4V). Main focus was elimination or decreasing the crack occurrence and increasing adhesion strength. For this ...
  • Prediction of dynamic force characteristics od radial tires using finite element and experimental techniques 
    Alkan, Veysel. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    A tire is one of the most important components of a vehicle. To predict its dynamic force characteristics, a detailed finite element model is constructed. In the finite element analysis of the tire, nonlinear stress-strain ...
  • Finite-element analysis of radiative transport in gray participating media 
    Kalenderoğlu, Vahan. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1980., 1980.)
    A finite-element solution scheme for radiative transport problems in gray participating media is devised, and its validity is substantiated through application to representative problems involving plane-parallel geometry ...
  • Investigation of extrudability of different aluminum alloys by using the method of hot extrusion 
    Çıtak, Hasan Cem. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2005., 2005.)
    Aluminum extrusion is a very important forming process in metal industries. Byusing different dies and technologies, high variety of products can be produced byusing the method extrusion. Extrudability is an important ...
  • Microstructure and mechanical properties of friction welded cast and forged steel bars 
    Sunay, Yusuf Tolga. (Thesis (M.S)-Bogazici University.Institute for Graduate Studies in Science and Engineering, 2005., 2005.)
    Friction welding has been represented as a technological solid-state joining processwidely used for dissimilar material combinations with high joint strength, short mass production time and low energy characteristics. This ...
  • Parallel and unstructured computation of 2-D and 3-D vortex flows 
    Dayı, Oğuz. (Thesis (M.S)-Bogazici University.Institute for Graduate Studies in Science and Engineering, 2005., 2005.)
    Vortex flows are main flows which lead to turbulence phenomenon. Turbulence isa complicated and many-faceted problem of fluid dynamics. These flows have striking and varied spatial organizations. Nearly every flow that can ...
  • Effects of calcination and particle size on the sintering of natural hydroxyapatite 
    İpekoğlu, Mehmet. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2004., 2004.)
    The aim of this thesis was to investigate the best suitable method for the production of hydroxyapatite from fresh bone and to determine the effects of reducing the particle size of the hydroxyapatite powder on the ...
  • Fatigue behavior of spot welds 
    Ertaş, Ahmet Hanifi. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2004., 2004.)
    The resistance spot welding process is widely used in industry, especially in automotive industry. This type of joining method is used widely because of its simplicity, cheapness and of course reliability which are significant ...
  • Manufacturing of rigid porous filters 
    Mahmutyazıcıoğlu, Nazım. (Thesis (M.S.) - Bogazici University. Institue for Graduate Studies in Science and Engineering, 2002., 2002.)
    Filtration is a basic operation frequently used in ceramic industries. Ceramic articles can be shaped using appropriate molds with or without pressure application. In this study, plastic molds with filter properties, high ...
  • Production of a sample automotive part by integration of rapid prototyping and a precision casting process 
    Açar, Özgür. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2001., 2001.)
    The goal in the manufacturing arena is to present new products from concept to market quickly and inexpensively. Introducing new products at ever increasing rates is very critical for remaining succesful in a competitive ...
  • Autotunning and robustness of multi-loop pid-controlled mulltivariable processes 
    Deva, Ergin Levent. (Thesis (M.S.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 2000., 2000.)
    In this study, decentralized PID controllers which are commonly used in process industry are applied to multi-input multi-output systems. A short literature survey is done and basic characteristics of these systems with ...