A STOCHASTIC ANALYSIS APPROACH FOR THE CALCULATION OF HYDRODYNAMIC DAMPINGS

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 remain 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 resulting from the linearization of the Morison's equation.

• Supplemental Notes:
  • OMAE 1995, 14th Intl Conf on Offshore Mechanics & Arctic Engng; 18-22 June 1995; Copenhagen, Denmark. Sponsored by ASME et al. Procs. Publ by ASME, ISBN 0-7918-1307-X. Vol I, Pt B, p 89 [6 p, 8 ref, 1 tab, 2 fig]
• Authors:
  • Karadeniz, H
• Publication Date: 1995

Language

• English

Subject/Index Terms

• TRT Terms: Damping (Physics); Force; Offshore structures; Stochastic processes; Waves
• Old TRIS Terms: Wave forces on structures
• Subject Areas: Bridges and other structures; Data and Information Technology; Marine Transportation;

Filing Info

• Accession Number: 00718514
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Mar 27 1996 12:00AM