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Filtering by: Dspace Collection Electronic Theses and Dissertations Remove constraint Dspace Collection: Electronic Theses and Dissertations Committee Member Smith, Charles E. Remove constraint Committee Member: Smith, Charles E. Degree Field Mechanical Engineering Remove constraint Degree Field: Mechanical Engineering Resource Type Dissertation Remove constraint Resource Type: Dissertation

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  • Numerical study of natural convection in square partitioned and non-partitioned enclosures

    Creator:
    Sukkaset, Prasart
    Abstract:
    Heat transfer characteristics and associated temperature and flow fields for natural convection in two-dimensional, square, partitioned and non-partitioned enclosures have been determined for Grashof numbers ranging from 10³ to 10⁶. The vertical side walls of the enclosure are isothermal with all other surfaces assumed to be adiabatic. An adiabatic partition...
    Resource Type:
    Dissertation
    Full Text:
    , and hence the heat transfer coefficients, were determined using Mach-Zehnder interferometry. These

  • Response of guyed offshore towers to stochastic loads in the presence of steady current

    Creator:
    Brynjolfsson, Sigurdur
    Abstract:
    The validity of the widely used stochastic linearization method for analysing the response of guyed towers to stochastic loads is investigated. The governing equations of a guyed tower have two main sources of nonlinearities, fluid-structure interaction and the restoring force of the cables. In this study, two models are considered....
    Resource Type:
    Dissertation
    Full Text:
    , (38) X (t), is to lump the area under the PSD curve at equal frequency intervals dw and let these

  • Elastodynamic analysis of a propagating finite crack in a micropolar elastic solid

    Creator:
    Han, Seog-young
    Abstract:
    A dynamic propagation of a finite crack of opening mode in a micropolar elastic solid was investigated. By using an integral transform method, a pair of twodimensional singular integral equations governing stress and couple stress was formulated in terms of the displacement transverse to the crack, macro- and microrotations, and...
    Resource Type:
    Dissertation
    Full Text:
    microinertia. These integral equations are solved numerically. Solutions for dynamic stress intensity and

  • Optimal design of traction drive continuously variable transmissions

    Creator:
    Lim, Kyoung Ho
    Abstract:
    The optimal design technique for minimum power loss in traction drive continuously variable transmissions is developed. The mathematical model is developed to evaluate the traction force and torque in traction drive contact. Kinematic analysis of general traction drive contact is conducted to find the best configuration for minimum power loss....
    Resource Type:
    Dissertation

  • Dynamic finite element analysis of micropolar elastic materials

    Creator:
    Kim, Jong-bum, 1960-
    Abstract:
    In granular or fibrous materials, in which the dimensions of the internal structure can be of the same order of magnitude as major flaws or holes, classical elasticity theory does not consistently provide accurate models of the large stress gradients that may develop. With the incorporation of additional rotational degrees...
    Resource Type:
    Dissertation

  • Development of acoustic emissions testing procedures applicable to conventionally reinforced concrete deck girder bridges subjected to diagonal tension cracking

    Creator:
    Lovejoy, Steven C.
    Abstract:
    A need exists to develop a non-destructive testing technique that can identify the formation and propagation of diagonal tension cracks in conventionally steel reinforced concrete deck girder (RCDG) highway bridges in the State of Oregon. Such a technique could be included into a structural health monitoring (SHM) system installed on...
    Resource Type:
    Dissertation
    Full Text:
    in-service maintenance inspections of these bridges. Felicity and Calm Ratio values are related to

  • Kinematic analysis of legged system locomotion on smooth horizontal surfaces

    Creator:
    Baek, Yoon Su
    Abstract:
    This thesis presents a model of legged locomotion in which position and velocity of body are directly controlled by positions and velocities of feet. One central relationship between foot acceleration, leg stroke and body velocity is developed. Procedures for determining all parameters of a step sequence including periods of constant...
    Resource Type:
    Dissertation
    Full Text:
    acceleration and body velocity during steady state. These numbers provide useful relationships for design

  • Robust controller design for robotic manipulators with saturation

    Creator:
    Liang, Zuyang
    Abstract:
    The development of modern industries calls for the robotic manipulators with high speed and accurate tracking performance. Many authors have paid attention to robust control of robotic manipulators; however, only few authors have also considered the control problem of manipulators with power limitation. In this dissertation, the robotic manipulator is...
    Resource Type:
    Dissertation
    Full Text:
    and Kane's Dynamical Equations. Based on these methods a lot of algorithms have been proposed

  • Three-dimensional, nonlinear viscoelastic analysis of laminated composites : a finite element approach

    Creator:
    Wang, Min
    Abstract:
    Polymeric composites exhibit time-dependent behavior, which raises a concern about their long term durability and leads to a viscoelastic study of these materials. Linear viscoelastic analysis has been found to be inadequate because many polymers exhibit nonlinear viscoelastic behavior. Classical laminate theory is commonly used in the study of laminated...
    Resource Type:
    Dissertation
    Full Text:
    their long term durability and leads to a viscoelastic study of these materials. Linear viscoelastic

  • Micromechanics of heterogeneous materials under compressive loading

    Creator:
    Laird, George
    Abstract:
    In mining and mineral processing, compressive loading is often encountered during the comminution of ore bearing minerals and in the wear resistant materials used in the comminution circuit. A common thread joining many of the materials that are primarily used under compressive loading is the presence of a high modulus...
    Resource Type:
    Dissertation
    Full Text:
    dissertation. His patience and scientific skills made our joint research efforts a true pleasure during my