Stability-Based Design of Two-Point Mooring Systems With Hydrodynamic Memory

[+] Author and Article Information
J.-S. Chung

Research and Development Department, American Bureau of Shipping and Affiliated Company, Two World Trade Center, 106th Floor, New York, NY 10048

J. Offshore Mech. Arct. Eng 119(1), 61-69 (Feb 01, 1997) (9 pages) doi:10.1115/1.2829047 History: Received June 01, 1996; Revised September 16, 1996; Online December 17, 2007


A systematic method of determining the design parameter values of two-point mooring (TPM) systems is presented. The conclusions of nonlinear stability analysis of horizontal plane slow motion dynamics of TPM systems with hydrodynamic memory are used to guide selection of the design variables. Specifically, within the stable regions of bifurcation diagram, a set of parameter values is chosen systematically to examine the corresponding TPM system. Then, each TPM system is simulated and the results are evaluated in terms of given criteria such as tension level of the mooring line or offset of the moored vessel. The hydrodynamic memory effect due to the oscillatory motions of moored vessel is included in the formulation. The memory effect influences the stability properties of TPM systems and alters the design chart/bifurcation diagram and particularly the static loss and dynamic loss of stability. The significance of hydrodynamic memory on several TPM systems is illustrated by comparing the statistics of the simulations. The design approach implemented in this work shows that nonlinear stability theory can be used effectively in the actual design process of mooring systems to reduce dramatically the number of simulations required. It is also shown that the often inconclusive nonlinear time simulations can be guided by theoretical nonlinear stability analysis of system dynamics to produce improved design values of system parameters of TPM systems.

Copyright © 1997 by The American Society of Mechanical Engineers
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