IS IT POSSIBLE TO CALCULATE THE BEHAVIOR OF A SHIP AT THE DESIGN STAGE?

Under the main headings Rigidity, Mass, Damping, and Excitation, each of which represents an essential factor in the study of the vibration behavior of a ship, the Author (of IRCN) reviews the literature on calculations for predicting ship vibrations at the design stage and discusses each of these four factors. It is concluded that there is a lack of fundamental knowledge of added mass, damping, and excitation forces, and that this deficiency is being filled by simplified methods which are often questionable. However, where it is possible to determine the added masses with reasonable approximation, a mass-rigidity model of the structure will permit the reliable determination of the ship's natural frequencies and modes. Also, the response of the structure to unit stresses applied at the thrust bearing and on the hull in way of the propeller disc will, for arbitrarily-chosen viscous damping, allow potentially dangerous frequencies to be recognized.

• Corporate Authors:

  Journal de la Marine Marchande

  190 Boulevard Haussmann
  75008 Paris,   France 

  Journal de la Marine Marchande

  190 Boulevard Haussmann
  75008 Paris,   France 
• Authors:
  • Armand, J L
• Publication Date: 1976

Language

• French

Media Info

• Features: References;
• Pagination: 7 p.
• Serial:
  • Nouveautes Techniques Maritimes 1976
  • Publisher: Journal de la Marine Marchande

Subject/Index Terms

• TRT Terms: Coefficients; Damping (Engineering); Mass; Measurement; Structural analysis; Structural mechanics; Vibration; Viscous fluids
• Uncontrolled Terms: Structural response; Viscous damping
• Old TRIS Terms: Added mass; Vibration measurement
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00158002
• Record Type: Publication
• Source Agency: British Ship Research Association
• Files: TRIS
• Created Date: Aug 31 1977 12:00AM