A stochastic analysis approach for the calculation of hydrodynamic dampings
Conference
·
OSTI ID:194691
- Delft Univ. of Technology (Netherlands). Dept. of Civil Engineering
This paper introduces an alternative linearization algorithm for nonlinear loading terms occurring in the spectral analysis of offshore structures. The algorithm makes use of member consistent forces for the linearization unlike the traditional linearization method. Different linearization criteria are used for different components of the member consistent forces. An equivalent second moment criterion is used to linearize the force component due to wave velocities while the components due to current and structural velocities are kept being stochastic. Calculation of their mean values is presented for the analysis. A deterministic added mass matrix and a stochastic hydrodynamic damping matrix are derived from the force component due to structural deformations. It is demonstrated that the mean value hydrodynamic damping ratios which are calculated in the paper are more realistic than those resulted from the linearization of the Morison`s equation.
- OSTI ID:
- 194691
- Report Number(s):
- CONF-950695--; ISBN 0-7918-1307-X
- Country of Publication:
- United States
- Language:
- English
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