Dynamics of a large moored floating body in ocean waves involves frequency dependent added mass and radiation damping as well as the linear and nonlinear mooring line characteristics. Usually, the added mass and radiation damping matrices can be estimated either by potential theory-based calculations or by experiments. The nonlinear mooring line properties are usually quantified by experimental methods. In this paper, we attempt to use a nonlinear system identification approach, specifically the Reverse Multiple Inputs-Single Output (R-MISO) method, to a single-degree-of-freedom system with linear and cubic nonlinear stiffnesses. The system mass is split into a frequency independent and a frequency dependent component and its damping is frequency dependent. This can serve as a model of a moored floating system with a dominant motion associated with the nonlinear stiffness. The wave diffraction force, the excitation to the system, is assumed known. This can either be calculated or obtained from experiments. For numerical illustration, the case of floating semi-ellipsoid is adopted with dominant sway motion. The motion as well as the loading are simulated with and without noise assuming PM spectrum and these results have been analyzed by the R-MISO method, yielding the frequency dependent added mass and radiation damping, linear as well as the nonlinear stiffness coefficients quite satisfactorily.
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May 2003
Technical Papers
Parameter Identification of a Large Floating Body in Random Ocean Waves by Reverse MISO Method
S. K. Bhattacharyya,
e-mail: skbh@iitm.ac.in
S. K. Bhattacharyya
Department of Ocean Engineering, Indian Institute of Technology, Madras, India
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R. Panneer Selvam
R. Panneer Selvam
Department of Ocean Engineering, Indian Institute of Technology, Madras, India
Search for other works by this author on:
S. K. Bhattacharyya
Department of Ocean Engineering, Indian Institute of Technology, Madras, India
e-mail: skbh@iitm.ac.in
R. Panneer Selvam
Department of Ocean Engineering, Indian Institute of Technology, Madras, India
Contributed by the OOAE Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received by the ASME OOAE Division, June 2001; final revision, February 2002. Associate Editor: S. Calisal.
J. Offshore Mech. Arct. Eng. May 2003, 125(2): 81-86 (6 pages)
Published Online: April 16, 2003
Article history
Received:
June 1, 2001
Revised:
February 1, 2002
Online:
April 16, 2003
Citation
Bhattacharyya, S. K., and Selvam, R. P. (April 16, 2003). "Parameter Identification of a Large Floating Body in Random Ocean Waves by Reverse MISO Method ." ASME. J. Offshore Mech. Arct. Eng. May 2003; 125(2): 81–86. https://doi.org/10.1115/1.1493201
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