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 modeled as finite-memory systems. The numerical computation effort required for spectral estimations using the proposed method is significantly less than that of the Volterra-series method that requires multi-dimensional integrations. Nonlinear frequency-domain analyses of two jack-up platform structures are carried out to study the effects of inundation, cubic and quartic drag terms and polynomialization methods.
Issue Section:
Technical Papers
Keywords:
offshore installations,
structural engineering computing,
ocean waves,
spectral analysis,
frequency response,
nonlinear estimation,
correlation methods,
Fourier transforms,
Nonlinear Drag,
Inundation,
Polynomial Approximation,
Power Spectrum,
Volterra-Series,
Price’s Theorem,
Correlation Function,
Fourier Transform
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