Yayın tarihi için Ph.D. Theses listeleme

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  • 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 ...
  • 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 ...
  • A deterministic approach to transition to turbulance in plane shear flows 
    Atalık, Salim Kunt. (Thesis (Ph.D.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1999., 1999.)
    In this work, a parametrical study of the transition to turbulence in two-dimensional shear flows has been conducted. For this purpose, the solutions of the full two-dimensional Navier-Stokes equations have been investigated ...
  • Physical based analysis and model reduction of engineering systems 
    Orbak, Ali Yurdun. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2003., 2003.)
    There is a need for obtaining low order approximations of high order models of physical systems as low order models result in several advantages including the reduction of computational complexity and improved understanding ...
  • Characterization of NiMnGa magnetic shape memory alloys 
    Pirge, Gürsev. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2005., 2005.)
    Magnetic shape memory (MSM) alloys are a new class of actuator materials withhigh actuation frequency, energy density and strain and they can be used in themanufacturing of actuators, smart structures, sensors and transducers. ...
  • Numerical investigation of high Knudsen number flow in rectangular enclosures 
    Orhan, Mehmet. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    Nowadays, enlightening unknown aspects of rarefied gas flow is one of the critical issues of fluid dynamic research to ensure correct and proper operations of manyMicro- Electro-Mechanical-Systems (MEMS). Thermally driven ...
  • LPV modeling and robust control of yaw and roll modes of road vehicles 
    Başlamışlı, Selahattin Çağlar. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    In this thesis, the usefulness of linear parameter varying (LPV) modeling of vehicle dynamics is investigated for controller synthesis to take nonlinear tire behavior into account. The H infinity control framework is used ...
  • Mechanical behavior of low density polymeric foams under multiple loading and unloading 
    Öztürk, Umud Esat. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this thesis, mechanical behavior and energy absorption characteristics of low density polymeric foams under multiple loading and unloading are investigated for uniaxial and hydrostatic compression, uniaxial tension, ...
  • 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 ...
  • Dynamic analysis of diesel engine crankshaft system using finite elements and multibody system simulation programs 
    Yılmaz, Yasin. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this thesis, dynamic analysis of in-line six cylinder diesel engine crankshaft system is carried out using analytical and numerical methods. The dynamic analysis of the crankshaft system consists of calculation of forces, ...
  • 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 ...
  • Fabrication and characterization of Al, AlMgSi, and AlSi foams 
    Mahmutyazıcıoğlu, Nazım. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    Manufacturing of metal foams by using powder compact melting (PCM) method, with the most important considerations like material and method selection, powder blending, cold compaction, hot compaction and hot extrusion and ...
  • 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 ...
  • 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 ...

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