A three-dimensional model to analyse dynamic response of VLFS based on the Kane method

ABSTRACT

A 3D dynamic analysis model of VLFS is formulated based on Huston’s interpretation of the Kane methodology. In this proposed model, the VLFS is considered as a serial of discrete floating bodies linked by universal joints with elasticity. The computing formulas of rotation stiffnesses of elastic universal joints are put forward based on the bending moments and torsions equivalent between the continuous beam model and the model of discrete jointed multiple bodies. The applicability of the formulas is verified through the comparison of the results in this paper and other literature. Validation of the Kane-based method and the correctness of corresponding programme developed are made by several comparative studies on a large floating structure in variant wave conditions. The predictions based on the proposed method are highly in coincidence with the model test observations and predicted results given by the related literatures.

KEYWORDS:

• Ocean engineering
• Very Large Floating Structure (VLFS)
• multibody dynamics
• Kane method
• elastic joint

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors would like to thank the China Postdoctoral Science Foundation under Grant No. 2020M683755 and the High-tech Ship Research Project (Grant No. [2019]357) sponsored by Chinese Ministry of Industry and Information Technology for financially supporting this research.