Structural Design Optimization Method for Catenary Mooring Cables in Deep Water

Abstract

The invention relates to a structural design optimization method for a deepwater catenary mooring rope. The method aims at an 'anchor chain-steel rope-anchor chain' three-section combined deepwater catenary mooring rope, structural parameters of length of each section of the rope, top pretension, mooring horizontal radiation distance and the like are determined through iterative computation by giving consideration to specific requirements of design specifications on various indicators under the condition of given rope specifications, operating water depth and allowable limit horizontal offset of a floating body, and accordingly horizontal restoration characteristics of the rope reaches optimum under the condition of controlling total steel consumption and mooring load, and then structure types and stress situations of the rope under different states are computed to bring convenience to type selection of mooring equipment. Compared with existing commercial software such as mooring analysis software MOSES and SESAM, the method has the advantages of oriented design, high practicality, high convergence speed and the like, achieves optimal selection of various design parameters and can be used for preliminary scheme design and performance evaluation of deepwater floating type platform catenary mooring systems.

Description

technical field [0001] The invention relates to a method for structural design of a mooring cable, in particular to a structural design optimization method for a three-section combined deep-water catenary mooring cable of "anchor chain-steel cable-anchor chain", belonging to the field of deep-water marine engineering . Background technique [0002] The deep-water floating platform has been positioned at sea for a long time. Whether it can achieve successful positioning and safe production depends on its mooring system, which depends on the level of mooring design. At present, most deep-water floating platforms still use steel catenary mooring systems, and among them, the three-section combined mooring cable of "anchor chain-steel cable-anchor chain" is the most widely used. The application of combined mooring lines optimizes the positioning performance of the mooring system and reduces the overall mooring load and material consumption. However, new problems have been intro...

AI Technical Summary

Problems solved by technology

[0003] At present, various mature commercial software (such as MOSES, SESAM, etc.) can accurately calculate the configuration and force of mooring lines, but they can only calculate and check the existing mooring schemes, and cannot calculate various The reasonable value of the parameter

Although other mooring design software such as DMOOR can optimize the mooring line to a certain extent, it cannot cover the various indicators of the design specification and specific design requirements well, which is not conducive to the direct application of the project

However, the traditional shallow water mooring design experience cannot be directly applied to deep water.

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