ON THE COUPLING OF HULL VIBRATION AND BOTTOM VIBRATION OF SHIPS

Higher mode vibration of the ship's hull is analysed, where the main hull is assumed to be a uniform beam (bending deflection is neglected) and the bottom, an elastic plate. Coupling effect of vibratory systems (main hull and bottom) is found to be significant. As the mode becomes higher, the natural frequency obtained from the present theory is considerably lower than that from conventional beam theory. In the region above the natural frequency of the bottom plate the new modes are found, which do not appear from the conventional theory. The longitudinal bending rigidity of the bottom has great effect upon the node-frequency relationship especially in the higher mode. The above-mentioned conclusions partially explain the phenomenon observed in the actual ships.

• Corporate Authors:

  Society of Naval Architects of Japan

  23 Shiba-kotohiracho, Minato-ku
  Tokyo 135,   Japan 
• Authors:
  • Yamakoshi, M
  • Ohnuma, S
• Publication Date: 1969

Media Info

• Features: References;
• Pagination: p. 23-38
• Serial:
  • Selected Papers, J of Soc of Naval Arch of Japan
  • Volume: 2
  • Publisher: Society of Naval Architects of Japan

Subject/Index Terms

• TRT Terms: Hulls; Ships; Vibration
• Old TRIS Terms: Hull vibration
• Subject Areas: Design; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00035157
• Record Type: Publication
• Source Agency: Society of Naval Architects of Japan
• Files: TRIS
• Created Date: Oct 27 1973 12:00AM