ON MODAL ANALYSIS OF SHIP STRENGTH

An approach is formulated by which structural dynamics of ships may be analysed in a linear model form. By employing the principal modes of the ship in vacuo, simple orthogonality relations can be retained without dependence on the necessarily approximate techniques used to estimate fluid forces. It is also possible to identify modal contributions to mass, damping and stiffness for the hull and for the hydrodynamic actions separately. Those contributions of hydrodynamic origin may depend significantly on time history effects which can be measured by means of a model test; these effects can be admitted into the ship strength analysis, it is believed for the first time. It is shown how existing modal theories fo ship strength and theories of seakeeping (i.e. of 'rigid body' motion in a seaway) fits into this more general analysis.

• Corporate Authors:

  Royal Society of London

  6 Carleton House Terrace
  London SW1Y 5AG,   England 
• Authors:
  • Bishop, RED
  • Price, W G
• Publication Date: 1974-10

Media Info

• Features: References;
• Pagination: p. 121-134
• Serial:
  • Volume: 341
  • Issue Number: 1624

Subject/Index Terms

• TRT Terms: Hulls; Loads; Modal analysis; Modal split; Structural analysis; Structural mechanics; Waves
• Uncontrolled Terms: Structural response
• Old TRIS Terms: Hull stiffness; Wave induced loads
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00080054
• Record Type: Publication
• Source Agency: Royal Society of London
• Report/Paper Numbers: Series A Proceeding
• Files: TRIS
• Created Date: May 1 1975 12:00AM