Abstract

A finite difference method (FDM) solving the coupled partial differential equations governing three-dimensional (3D) motions of a towed underwater cable has been implemented in a combined ensemble Kalman filter (EnKF) and ensemble Kalman smoother (EnKS), as a new approach to combined state and parameter estimation for towed underwater cables. A simulation study of the method applied to a seismic streamer has been performed. Cable state variables as well as model parameters are estimated. Parameters estimated are crossline ocean current varying with time as well as cable tangential drag coefficient. The presented results indicate that the method is able to estimate state as well as parameters for seismic streamers.

Issue Section:
Offshore Technology
Keywords:
Computational mechanics, Dynamics of structures, Hydrodynamics, Risers, Ship motions, Risers, Cable dynamics, Moorings, Design
Topics:
Cables, Parameter estimation, Simulation, Kalman filters, Drag (Fluid dynamics), Tension

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