LARGE AMPLITUDE OSCILLATIONS OF GEOMETRICALLY NONLINEAR ELASTIC BEAMS SUBJECTED TO HYDRODYNAMIC EXCITATION

The dynamic response of slender pipes to cyclic flexural excitations could be significantly influenced by the "membrane" stiffness of the beam with axial restraint at the ends, wherein the magnitude of the exciting force is such as to induce large lateral deflections. This typical nonlinearity of structural mechanics is generally approached adopting semi-analytical procedures for simple configurations, and more often using numerical solutions as well as finite element techniques for more realistic configurations. In this paper the mathematical formulation of large amplitude oscillations of geometrically nonlinear beams is introduced and numerical models for nonlinear response of beams under harmonic and generally random excitation are presented. Two applications are reported: in the former the effect of the initially deflected shape on dynamic response under regular vortex shedding is analysed and in the latter the effect of the dynamic stiffening due to axial restraint on lock in range is analysed.

• Supplemental Notes:
  • Procs. Intl. Conference on Computer Modelling in Ocean Engng., held Venice, 19-23 Sept. 1988, p. 555 [11 pp., 32 ref., 2 tab.]
• Authors:
  • Bruschi, R
  • Vitali, L
• Publication Date: 1988

Language

• English

Subject/Index Terms

• TRT Terms: Cables; Cylindrical bodies; Pipelines
• Old TRIS Terms: Hydrodynamic forces; Risers
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00695111
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM