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RISQuasi-Static Response of Fixed Offshore Platforms to Morison-Type Wave Loadings
Publisher: American Society of Civil Engineers
Abstract: The stochastic response of a rigid platform is quasi-static and can be represented as a linear combination of nonlinear random wave loadings. In this study two efficient probabilistic approaches are respectively presented ...
Single-Loop QFT Design for Robust Performance in the Presence of Non-Parametric Uncertainties
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This note focuses on the robust performance control design problem in single-loop systems from the viewpoint of the Quantitative Feedback Theory (QFT) method. Unlike the more general setup for ...
Least-Squares, Moment-Based, and Hybrid Polynomializations of Drag Forces
Publisher: American Society of Civil Engineers
Abstract: In order to carry out nonlinear dynamic analyses of fixed offshore structures in the frequency domain, polynomial approximations of the distributed drag term,
Response Spectrum Estimation for Fixed Offshore Structures With Inundation Effect Included: A Price’s Theorem Approach
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Instead of a Volterra-series based method, a method based on Price’s theorem and Fourier Transforms is proposed for evaluating the nonlinear response power spectra of fixed offshore structures ...
Polynomial Approximations of Wave Loading and Superharmonic Responses of Fixed Structures
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Besides the commonly considered drag force, inundation due to variable water surface is another important nonlinear effect of wave loading. Quadratic and quartic approximations of the inundation ...
Francis-Type Reversible Turbine Field Investigation During Fast Closure of Wicket Gates
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Flexible electricity demand and variability of the electricity produced by wind turbines and photovoltaic affect the stable operations of power grids. Pump-turbines are used to stabilize the power grid by maintaining a ...
Non-Gaussian Random Wave Simulation by Two-Dimensional Fourier Transform and Linear Oscillator Response to Morison Force
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The one-dimensional fast Fourier transform (FFT) has been applied extensively to simulate Gaussian random wave elevations and water particle kinematics. The actual sea elevations/kinematics exhibit ...
Sensitivity Analysis for the Principal Strain Parameters of a Deformation Monitoring Network
Publisher: American Society of Civil Engineers
Abstract: Strain tensor analysis plays an essential role in geophysics and engineering applications, because it provides a numerical measure on the relative deformation behavior of the object under investigation. A strain tensor can ...
Survival Analysis of Bus Running Time near Bus-Stop Areas
Publisher: American Society of Civil Engineers
Abstract: This study proposes a quantitative approach to evaluate the effects of mixed traffic flow on bus running times (except bus dwell times) near bus-stop areas based on linear regression and survival analysis theory. Research ...
An Objective Method for Determining Ocean Mixed Layer Depth with Applications to WOCE Data
Publisher: American Meteorological Society
Abstract: AbstractA new method is developed to identify the mixed layer depth (MLD) from individual temperature or density profiles. A relative variance profile is obtained that is the ratio between the standard deviation and the ...