Search Constraints

Start Over
Filtering by: Creator Nyerges, Timothy L. Remove constraint Creator: Nyerges, Timothy L. Academic Affiliation Mechanical Engineering Remove constraint Academic Affiliation: Mechanical Engineering

Search Results

  • A study of cavitation instabilities in solids

    Creator:
    Puttapitukporn, Tumrong
    Abstract:
    Cavitation instabilities in elastic-plastic solids under spherically-symmetric and axisymmetric loadings were investigated using the finite element method. Both quasi-static and dynamic analyses were used to solve these problems. In the quasi-static analyses, we investigated a cavitation instability in elastic/perfectly-plastic, linear hardening elastic-plastic, power hardening elasticplastic, and constrained silver materials. Here,...
    Resource Type:
    Dissertation
    Full Text:
    Cavitation Instabilities in Solids. Abstract anoroved: Timothy C. Kennedy Cavitation instabilities in

  • Turbulence induced loads on a teetered rotor

    Creator:
    Weber, Timothy L.
    Abstract:
    Development of variable speed horizontal axis wind turbines has resulted in a need for an analysis code with a rotor speed degree-of-freedom. This study develops a five degree-of-freedom time domain computer code that evaluates blade and rotor, mean and cyclic loads with nonlinear aerodynamics together with atmospheric turbulence as a...
    Resource Type:
    Dissertation
    Full Text:
    OF THE THESIS OF Timothy L. Weber for the degree of Doctor of Philosophy in Mechanical Engineering

  • Transient fuel pin temperature calculations using describing functions

    Creator:
    Guidotti, Timothy E.
    Abstract:
    An important element in rector safety and fuel performance assessments is the efficient calculation of the time dependent temperature profiles within reactor fuel pins. Because the fuel pins have temperature dependent thermal properties, the governing partial differential equations are nonlinear. Traditionally, finite difference or finite element methods have been used...
    Resource Type:
    Masters Thesis
    Full Text:
    describing functions AN ABSTRACT OF THE THESIS OF Timothy E. Guidotti for the degree of Master of Science

  • 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:
    ./Kenn-60 Redacted for Privacy Mysore N. L. narasimnan A dynamic propagation of a finite crack of

  • A study of forces on simulated heat exchange tubes immersed in a cold fluidized bed

    Creator:
    Donovan, Jerry Eugene
    Abstract:
    The object of this research, project was to study how different parameters effect the magnitude and frequency composition of forces exerted on simulated heat exchange tubes immersed in a cold fluidized bed. Two arrays of tubes were assembled with the tubes mounted in an equilateral triangular pitch pattern. The center...
    Resource Type:
    Masters Thesis
    Full Text:
    HEAT EXCHANGE TUBES IMMERSED IN A COLD FLUIDIZED BED Abstract approved: Redacted for Privacy (Timothy

  • A nonlocal damage theory for laminated plate with application to aircraft damage tolerance

    Creator:
    Nahan, Matthew F.
    Abstract:
    Design of commercial aircraft structure, composed of composite material, requires the prediction of failure loads given large scale damage. In particular, a fuselage of graphite/epoxy lamination was analyzed for damage tolerance given a standard large crack that severed both skin and internal structure. Upon loading, a zone of damage is...
    Resource Type:
    Dissertation
    Full Text:
    : Timothy C. Kennedy Design of commercial aircraft structure, composed of composite material, requires the

  • 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:
    : Timothy C. Kennedy Polymeric composites exhibit time-dependent behavior, which raises a concern about

  • 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:
    : Timothy C. Kennedy A need exists to develop a non-destructive testing technique that can identify

  • Simulating changing diameter distributions in a softwood sawmill

    Creator:
    Salichon, Maxence C.
    Abstract:
    Sawmills are very complex systems that involve many manufacturing processes. The variability of their raw material adds further to this complexity as each log has characteristics that determine its processing path. Therefore, computer simulation is a very useful technique for analyzing sawmill performance. This thesis describes a simulation computer model...
    Resource Type:
    Masters Thesis
    Full Text:
    professors, Dr. Charles C Brunner and Dr. Timothy C. Kennedy for their invaluable support, assistance and

  • 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:
    Many thanks go to my major advisor, Dr. Timothy C. Kennedy for his thoughtful advice and encouragement

  • Natural convection from a horizontal cylinder parallel to a heated vertical wall

    Creator:
    McCoy, Timothy J.
    Abstract:
    Heat transfer measurements have been made from a long (L/D = 15) horizontal cylinder in water parallel to a heated vertical wall. The cylinder and wall boundary conditions were isothermal, and they were maintained at equal temperatures. The investigation covered Rayleigh numbers based on cylinder diameter from 400,000 to 10,000,000....
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Timothy J. McCoy for the degree

  • Investigation of combustor and fuel preparation requirements for a combined-cycle wood fired power plant

    Creator:
    Bauer, Timothy Lee
    Abstract:
    The Pacific Northwest is a particularly good candidate for a power plant fired with wood since the wood products industry is so important in the area. The combined cycle concept for such a plant has increased in popularity due to the generally greater efficiency of the gas turbine part of...
    Resource Type:
    Masters Thesis
    Full Text:
    requirements for a combined-cycle wood fired power plant AN ABSTRACT OF THE THESIS OF Timothy Lee Bauer for

  • Development of a reduced-order dynamic model of a jet-in-crossflow from experimental data

    Creator:
    Pearen, Keith L.
    Abstract:
    A reduced-order dynamic model is derived that captures the primary dynamics of a jet-in-crossflow. This is significant progress toward the end goal of reduced order model based closed-loop flow control. The reduced order model is a set of differential equations obtained through the use of snapshot based Proper Orthogonal Decomposition...
    Resource Type:
    Masters Thesis

  • 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:
    : / Dr. John W. Leonard Redacted for Privacy Dr. Timothy C. Kennedy The validity of the widely used

  • Using discrete-event simulation to study the influence of log yard sorting on sawmill processing efficiency of small-diameter timber

    Creator:
    Pinon, Olivia J.
    Abstract:
    A sawmill is similar to other manufacturing enterprises when it comes to making decisions, scheduling production and meeting customer demands. In order to help sawmills achieve their goals, and because there is such a high degree of variability in the raw material used in this industry, computer simulation has proven...
    Resource Type:
    Masters Thesis
    Full Text:
    Small-Diameter Timber Abstract approved: / James W. Funck / Timothy C. Kennedy A sawmill is similar

  • Brake-based wheel speed control design of a rear wheel open differential vehicle

    Creator:
    Jeon, Eli
    Abstract:
    A brake-based wheel speed control system for a rear-wheel drive vehicle is developed and simulated in this thesis. The OSU mini-Baja vehicle team will use this study in the development and implementation of a similar system for upcoming competitions. Vehicle submittals must differ to a specified degree from previous year’s...
    Resource Type:
    Masters Thesis
    Full Text:
    wheels are coupled through the open differential via the terms Lδ and Rδ , and by adding a brake

  • Quality driven collaborative decision making for product development under the influence of trustworthiness

    Creator:
    Meier, Stefan
    Abstract:
    The focus of this study is the effective prioritization of customer requirements in collaborative product development. The CR priorities are often retrieved by questioning and interviewing targeted customers. But the targeted customer might not always be easily questioned, because they might not always be obvious or clearly known. If customers...
    Resource Type:
    Masters Thesis
    Full Text:
    this thesis. The author also thanks Dr. Timothy C. Kennedy and Dr. Michael H. Freilich, who both

  • The application of a band variable-inertia flywheel to an urban transit bus

    Creator:
    Moosavi-Rad, Hamid
    Abstract:
    This dissertation investigates by means of computer simulation the potential of a Band Variable-Inertia Flywheel (BVIF) to store energy for an urban transit bus. Replacing both a fixed-inertia flywheel (FIF) and a continuously variable transmission (CVT), the Band Variable-Inertia Flywheel is capable of accelerating a vehicle from rest to a...
    Resource Type:
    Dissertation
    Full Text:
    Professor Charles E. Smith for his support and assistance in this project; and Professors Timothy C

  • Evaluating the effectiveness of interaction strategies between product developer and supply chain using activity based modeling in environmental benign product design

    Creator:
    Wang, Bo
    Abstract:
    With growing concerns on environment impact of industrial product development, the product developers are seeking better solutions to achieve desired environmental benign requirements by the regulators and customers besides economic growth. During the last decade, some of the most successful product development companies (such as HP) have established their own...
    Resource Type:
    Masters Thesis
    Full Text:
    we all live far away from our parents. Also, thank Dr. Timothy C. Kennedy and Dr. Brian Bay to

  • Automating aquatic insect identification through pattern recognition

    Creator:
    Thomas, Joshua K.
    Abstract:
    Aquatic insect population counts can be a good indicator of the health, or water quality, of rivers and streams. Stoneflies (Plecoptera) are particularly susceptible to pollution in streams. However, today’s current method for obtaining these population counts requires biologists to examine individual specimens under a microscope for identification to the...
    Resource Type:
    Masters Thesis