Nonlinear Dynamic Response of Marine Structures Under Random Wave Loads

by Steven R. Winterstein, Stanford Univ, United States,
Lancelot Manuel, Stanford Univ, United States,
Odd B. Ness, Stanford Univ, United States,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


A simple nonlinear dynamic structure/ship model is combined with a filtered noise model of random wave loads. It is shown how this model can include (1) non-Gaussian wave elevations and velocities; (2) non-Gaussian structural forces due to the nonlinear Morison equation, with relative velocity effects and slow-drift forces; and (3) nonlinear structural stiffness and damping. The nonlinear analysis estimates response moments through equivalent (Hermite) polynomial models, and fits random process models to these moments to estimate reliability. Estimates of ship roll moments and extremes are shown to agree well with simulation. Useful approximations are also found from a simpler, structure-dependent white-noise model of wave excitation.

Subject Headings: Dynamic loads | Random waves | Wave velocity | Nonlinear waves | Nonlinear response | Dynamic response | Structural response | Dynamic structural analysis

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