Truncation analysis of mooring line based on dynamic similarity with consistent nonlinearity

The passive truncation model called DyTrunMoor is proposed to realize the dynamic similarity of mooring line in this paper. The nonlinear inertial forces and drag forces are integrated with Morison model within elastic rod model to reserve dynamic response of mooring line. The mooring line parameters of truncated line are figured out with the optimization algorithm NSGA-II for the static and dynamic simulation. The fitness function for NSGA-II is constructed with tension amplitudes corresponding to limited frequencies, which are fetched from tension history with Fast Fourier Transform algorithm. A single mooring line is discussed in detail with truncation from 1500 m to 1050 m water depth. The feasibility and accuracy of the truncation method is verified with harmonic forced motion, which shows a consistent nonlinearity in the dynamic response of the original and the truncated mooring line. Truncation design is also carried out to a Semi-submersible platform mooring system truncated from 1200 m to 700 m. The static and dynamic characteristics are compared, which verifies the validity of the proposed method.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01696535
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 23 2019 3:08PM