ADAPTIVE DYNAMIC RELAXATION TECHNIQUE FOR STATIC ANALYSIS OF CATENARY MOORING

In applying the displacement based finite element method to the static structural analysis of complex catenary mooring systems, lack of bending and compressional stiffness leads to ill-conditioning of the tangent stiffness matrix. Conventional numerical methods for non- linear structural analysis are ineffective. A new algorithm, called adaptive dynamic relaxation, was developed. Use was made of the inertia effect of the structural mass and that of added damping in constructing a conditioning mechanism to the tangent stiffness matrix. The resulting dynamic equations of motion were solved by using Newmark's integration formulas. Detailed adaptive control procedures for the time step and load step sizes, damping level, and the integration parameters were presented. Numerical experiments done indicated satisfactory robustness and efficiency. Comparison with an existing visco-elastic relaxation algorithm on a typical example showed improved robustness and much better efficiency. Advantages and potential applications of the algorithm are discussed.

  • Supplemental Notes:
    • Marine Structures, v 8 n 5, 1995, p 585 [15 p, 23 ref, 2 fig]
  • Authors:
    • Wu, S
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00711003
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM