Başlık için Ph.D. Theses listeleme

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  • 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 ...
  • 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 ...
  • Integrated computational alloy design, single crystal growth, and characterization of nickel base superalloys 
    Montakhabrazlighi, Mehdi. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    This dissertation is formed by a part of work conducted in a TUBITAK project (112M783). In the dissertation, first alloy design of a third generation superalloy, and then its production as single crystals, heat treatments, ...
  • 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, ...
  • Molecular dynamics study of water-HBN nanofluid 
    Akıner, Tolga. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    This study considers the molecular simulations of nanofluids and the goal is to investigate the thermomechanical mechanisms in nanoscale thermal transport. The enhanced thermal conductivity and limited shear viscosity ...
  • Multi-objective robust control of rotor / active magnetic bearing systems 
    Kuseyri, İbrahim Sina. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    This dissertation considers the application of recent robust linear control techniques to rotors with active magnetic bearings. Rotors suspended with electromagnetic bearings are inherently unstable; therefore feedback ...
  • Nonlinear viscoelastic material modeling using nested linkage mechanisms 
    Özcan, Mustafa Umut. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    In this study, basic linear lumped elements such as springs and dashpots are used in nested linkage mechanisms in order to simulate and predict the mechanical behaviour of nonlinear viscoelastic materials. The proposed ...
  • 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 ...
  • 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 ...
  • Numerical investigation of isothermal and non-isothermal viscoelastic flow in lid-driven polar cavity 
    Mercan, Hatice. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    The isothermal and non-isothermal viscoelastic ow of Phan-Thien-Tanner (PTT) uids is considered in lid-driven polar cavity geometry, with stationary and oscillatory lid motion, using a numerical solution method with ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Production of antibacterial hydroxyapatite 
    İpekoğlu, Mehmet. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    Hydroxyapatite was produced by rapid microwave synthesis method. Effects of microwave power and duration were examined on the powder morphology of the hydroxyapatite powder during the synthesis process and microwave aging ...
  • Shape and topology optimization of intertial amplification induced phononic band GAP structures 
    Yüksel, Osman. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    Inertial amplification is a novel phononic band gap generation method in which wide vibration stop bands can be obtained at low frequency regions. The engineering importance for this novelty comes from the fact that the ...
  • Shape optimization of thin-walled tubes under high-velocity axial and transverse impact loadings 
    Tanlak, Niyazi. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.)
    Thin-walled tubes are one of the most commonly used parts in structural ap- plications. More specifically, they are used as passive safety measures in vehicles like bumper-beams and crash-boxes. They take loads either ...
  • Theoretical and numerical analysis of fracture of shape memory alloys 
    Hazar, İbrahim Selçuk. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.)
    The subject of this thesis is theoretical and numerical analysis of the fracture of SMAs. First, the size of the martensitic region surrounding the tip of an edge-crack in a SMA plate is calculated analytically using the ...
  • 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 ...
  • Turbulent combustion modelling of fuels using LES 
    Güryuva, Serdar. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Combustion simulations with high fidelity turbulence models and detailed chemistry may suffer from high computational power requirements due to the combined cost of time-scale dissipation and small integration steps. Such ...

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