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Filtering by: Subject Barges -- Mathematical models Remove constraint Subject: Barges -- Mathematical models Degree Field Civil Engineering Remove constraint Degree Field: Civil Engineering

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  • Stability analysis of nonlinear coupled barge motions

    Creator:
    Nakhata, Tongchate
    Abstract:
    The present research investigates nonlinear barge motions through analyses of coupled multi-degree-of-freedom (MDOF) deterministic and stochastic models. Roll-Heave-Sway and other lower-ordered models are developed to predict the nonlinear motions and analyze the stability of a class of ship-to-shore cargo barges. The governing equations of motion contain coupled rigid body Roll-Heave-Sway...
    Resource Type:
    Dissertation
    Full Text:
    improve the accuracy of the 1DOF Roll model. The reliability of a barge in a variety of sea conditions is

  • Modelling, validation and simulation of multi-degree-of-freedom nonlinear stochastic barge motions

    Creator:
    Bartel, Warren A.
    Abstract:
    Recent developments in estimation of the survivability of a U.S. Navy transport barge in random seas are extended to improve accuracy. The single Degree-of-Freedom (DOF) model of a extreme roll response of a barge used in previous research is replaced by a 3-DOF roll-heave-sway model to include linear and nonlinear...
    Resource Type:
    Masters Thesis
    Full Text:
    extreme roll response of a barge used in previous research is replaced by a 3-DOF roll-heave-sway model

  • Coupled dynamics of bouys and mooring tethers

    Creator:
    Idris, Krisnaldi
    Abstract:
    Time-domain models were developed to predict the response of a tethered buoy subject to hydrodynamic loadings. A coupled analysis of the interaction of a buoy and its mooring is included and three-dimensional response is assumed. External loadings include hydrodynamic forces, tethers tensions, wind loadings and the weight of both cable...
    Resource Type:
    Dissertation
    Full Text:
    . Application of the present model to solve a multi-leg/multi-point mooring system is also provided

  • Modeling shallow-water hydrodynamics : rotations, rips, and rivers

    Creator:
    Long, Joseph W.
    Abstract:
    Hydrodynamic models are used as a diagnostic tool to understand the temporal variability of shallow-water processes that are difficult to completely resolve with traditional field measurements. For all simulations, modeled quantities are qualitatively or quantitatively compared with available measurements to gain confidence in conclusions derived from the modeled results. In...
    Resource Type:
    Dissertation
    Full Text:
    . The model and data are in good agreement for all wave conditions during the month and estimated model

  • Bridge Model Parameter Sensitivity in Pushover and Nonlinear Time History Analysis

    Creator:
    Johnsohn, Karryn E.
    Abstract:
    The aim of this research is to understand and quantify the modeling differences between CSiBridge and OpenSees, and to determine sensitive model parameters. When designing bridges for the high seismic region of California, the California Department of Transportation (Caltrans) performs nonlinear time history analysis of their bridge models. For three-dimensional...
    Resource Type:
    Masters Thesis
    Full Text:
    degree of Master of Science in Civil Engineering presented on June 9, 2016. Title: Bridge Model

  • Entering streamflow effects on currents of a density stratified model reservoir

    Creator:
    Elwin, Elmer Harvey
    Abstract:
    The effect of entering streamflow on currents of a density stratified reservoir has been studied in a laboratory model to provide insight into the prediction, control, and maintenance of quality water discharge from a thermally stratified reservoir. Twenty experiments were performed using various concentrations of a sodium chloride solution to...
    Resource Type:
    Masters Thesis
    Full Text:
    Streamflow Effects on Currents of a Density Stratified Model Reservoir Abstract approved: Redacted for

  • Digital simulation of multi-dimensional random processes and its applications

    Creator:
    Ahn, Gil Soo
    Abstract:
    This dissertation introduces a method which can simulate multi-dimensional Gaussian random processes by the superposition of sine functions The fast Fourier transform technique is incorporated into the simulating method to facilitate saving of computer time. In view of the fact that the fast Fourier transform play important roles in digital...
    Resource Type:
    Dissertation
    Full Text:
    noise vector through filters. He proposed the following model (7 ): m ym(t) =E krn1(T)xm(t=7),T m

  • Analysis of dichotomous response models for low-dose carcinogenic risk estimation

    Creator:
    Tabesh, Taraneh
    Abstract:
    Several dichotomous-response models of carcinogenesis are discussed and their implications for low-dose risk estimation are examined. In addition, a pharmacokinetic model incorporating non-linear kinetics is studied and the results are investigated with respect to multiple-pollutant exposures. None of these models appears to suggest the existence of "thresholds". The analysis of...
    Resource Type:
    Masters Thesis
    Full Text:
    estimation are examined. In addition, a pharmacokinetic model incorporating non- linear kinetics is studied

  • Field verification of a mathematical model for the physical fate prediction of dredged material instantaneously disposed at sea

    Creator:
    Hollings, William H.
    Abstract:
    Dredged spoil plumes are monitored during nine hopper dredge disposal events in 186 foot water depths offshore near Coos Bay, Oregon. Position and solids volume concentration characteristics of the plumes are established. Computer simulations of the monitored events are executed using the WES modified version of the Koh-Chang instantaneous disposal...
    Resource Type:
    Masters Thesis
    Full Text:
    Field Verification of a Mathematical Model for the

  • A stochastic precipitation event model for use in erosion simulations

    Creator:
    Istok, J. D.
    Abstract:
    Mathematical models of the precipitation process are needed to effectively use historical precipitation data in the design and planning of engineering projects and for analysis of watershed runoff behavior. Existing simple models based on the assumptions of independent, identically-distributed random variables are insufficient to describe several features of the historical...
    Resource Type:
    Dissertation
    Full Text:
    prediction calculations. Because the precipitation process is complex, a mathematical model of the