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Filtering by: Advisor Fang, S. C. Remove constraint Advisor: Fang, S. C. Degree Field Civil Engineering Remove constraint Degree Field: Civil Engineering

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  • Optimization and control of cable deployment systems

    Creator:
    Mtira, Mohamed
    Abstract:
    An optimization methodology, algorithms, and computer program for cable/lumped-body deployment system are developed for the design and installation of sonar packages in deep ocean ranges. In addition, a methodology and algorithms for the control of the system are proposed. A penalty function is developed in terms of the system parameters...
    Resource Type:
    Masters Thesis
    Full Text:
    Redacted for Privacy Head of Department of Civil Engineering Redacted for Privacy Dean of Graduat S hool

  • Chaotic response and stability of offshore equipment

    Creator:
    Lin, Huan
    Abstract:
    This investigation deals with the chaotic rocking response and overturning stability of offshore equipment subjected to base excitations due to wave-induced motions of the supporting compliant offshore structural system. The equipment compliant structural system is modelled as a free-standing rigid object subjected to horizontal and vertical base accelerations. Three of...
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for privacy Dr. Solomon C. S. Yim This investigation deals with the chaotic rocking response and

  • Nonlinear oscillations, bifurcations and chaos in ocean mooring systems

    Creator:
    Gottlieb, Oded
    Abstract:
    Complex nonlinear and chaotic responses have been recently observed in various compliant ocean systems. These systems are characterized by a nonlinear mooring restoring force and a coupled fluid-structure interaction exciting force. A general class of ocean mooring system models is formulated by incorporating a variable mooring configuration and the exact...
    Resource Type:
    Dissertation
    Full Text:
    discussed. C Copyright by Oded Gottlieb December 3, 1991 All Rights Reserved NONLINEAR OSCILLATIONS

  • Stochastic analysis of a nonlinear ocean structural system

    Creator:
    Lin, Huan
    Abstract:
    Stochastic analysis procedures have been recently applied to analyze nonlinear dynamical systems. In this study, nonlinear responses, stochastic and/or chaotic, are examined and interpreted from a probabilistic perspective. A multi-point-moored ocean structural system under regular and irregular wave excitations is analytically examined via a generalized stochastic Melnikov function and Markov...
    Resource Type:
    Dissertation
    Full Text:
    , Prof. Ron B. Guenther, Prof. Alan G. Hernried, Prof. Charles E. Smith, and Prof. Timothy C. Kennedy

  • 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:
    Densities, H=6 ft, T=10 s (semilog) 251 C.1 Measured and Predicted Response, H=6 ft, T=5 s 253 C.2

  • Deterministic and stochastic behaviors of a piecewise-linear system

    Creator:
    Mha, Ho-Seong
    Abstract:
    The (nonlinear) response behavior of a piecewise-linear system is investigated under both deterministic and stochastic excitations in this study. A semi-analytical procedure is developed to predict the system behavior by evaluating the joint probability density functions of the Fokker-Planck equations of the stochastic piecewise-linear system under random excitations via a...
    Resource Type:
    Dissertation
    Full Text:
    : m s .it+c X+R (X) = F(t) (2.1)s where R(X) is the restoring force which is a piecewise-linear

  • Seismic protection of flexible rotating machines using base isolators

    Creator:
    Su, Wen-Chyi
    Abstract:
    Base isolation is an alternative seismic design strategy in which the primary structures and their internal components are uncoupled from the potentially damaging horizontal components of an earthquake by base isolators which attenuate the transmission of horizontal acceleration into the system. Rotating machines are among the key internal components of...
    Resource Type:
    Dissertation
    Full Text:
    Privacy AC KNOWLEGEMENT The author is grateful to professors S. C. S. Yim and A. G. Hernried in the

  • Stochastic analysis of complex nonlinear system response under narrowband excitations

    Creator:
    Shih, I-Ming
    Abstract:
    Response behavior of a nonlinear structural system subject to environmental loadings is investigated in this study. The system contains a nonlinear restoring force due to large geometric displacement. The external excitation is modeled as a narrowband stochastic process possessing dynamic characteristics of typical environmental loadings. A semi-analytical method is developed...
    Resource Type:
    Dissertation
    Full Text:
    Response under Narrowb_and Excitations. Abstract approved: Solomon C. S. Yim Response behavior of a

  • Experimental analysis of a nonlinear moored structure

    Creator:
    Narayanan, Suchithra
    Resource Type:
    Dissertation
    Full Text:
    )]-1 = al [1 (f/fn )2+ 2c s (f/fa where the natural frequency fn and damping ratio C,s are defined

  • Stochastic analysis of the nonlinear response transition behavior of an ocean system

    Creator:
    Yuk, Dongjun
    Abstract:
    The nonlinear response of an ocean system subjected to random excitations can exhibit very complex dynamic behaviors including jump phenomena and coexistence of attractors. In this study, the stochastic system response behavior of a simple (Duffing) oscillator under narrow-band random excitations is first examined in the subharmonic resonance region. A...
    Resource Type:
    Masters Thesis
    Full Text:
    ) 20.01l ,; .~. ' .. " 11l.00 ': .':2·~·,~.'C, ·r~·",,·~"·· .~ .i';~:>::S:~'::'i ';;:. :;1 D.Y".~ I

  • 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:
    SB25), (a) roll and wave, (b) roll and heave, (c) roll and sway, and (d) heave and sway. Random waves

  • Deterministic and stochastic control of nonlinear oscillations in ocean structural systems

    Creator:
    King, Paul E.
    Abstract:
    Complex oscillations including chaotic motions have been identified in off-shore and submerged mooring systems characterized by nonlinear fluid-structure interactions and restoring forces. In this paper, a means of controlling these nonlinear oscillations is addressed. When applied, the controller is able to drive the system to periodic oscillations of arbitrary periodicity....
    Resource Type:
    Dissertation
    Full Text:
    advisor, Professor Solomon C. S. Yim, for his obvious dedication to the quest for scientific knowledge

  • 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:
    the Naval Civil Engineering Laboratory, Contract Number N4708-90-C-1146, the Naval Facility

  • Nonlinear finite element analysis of reinforced concrete structures strengthened with FRP laminates

    Creator:
    Chansawat, Kasidit
    Abstract:
    The Horsetail Creek (HC) bridge is an example of an Oregon bridge that was classified as structurally deficient and was not designed to withstand earthquake (EQ) excitations. A fiber-reinforced polymer (FRP) rehabilitation was performed on the HC bridge to increase flexural and shear capacities for traffic loads. However, a seismic...
    Resource Type:
    Dissertation

  • Numerical modeling of full-coupled fluid-structure interaction

    Creator:
    Yuk, Dongjun
    Abstract:
    A numerical model for the simulation of fully-coupled fluid-structure interaction is developed in this study. In modeling the fluid, the Reynolds Averaged Navier-Stokes equations are solved for an incompressible viscous fluid field and a k-ε model is employed for turbulence computations. Hydrodynamic forces obtained by the integration of the fluid...
    Resource Type:
    Dissertation
    Full Text:
    and c, are empirical coefficients, S is the Kronecker delta, k =< u'u' > /2 is the turbulent kinetic