PHENOMENA OF SHIP VIBRATION

Introductory study into the problems of ship vibration. A short general review of ship vibration problems is given. The reasons for the discrepancies between calcualted and measured results are discussed and related to the vibration parameters, modelling of ship structure, numerical methods etc. To overcome the difficulties caused by the simplification of the vibration parameters in computer programs and extend the present state of knowledge in this field, a qualitative analysis of ship vibration is preformend. The ship structure is simulated by a simple two-parameter system. The large mass represents the ship hull and the small mass a substructure. Different phenomena of the coupled ship hull and substructure vibration are studied, including different damping and stiffness of substructures, and the application of a double step calculation method is considered. In addition a quantitative analysis of ship vibration is performned. A few characteristics examples of ship vibration calculations using the finite element method are chosen from the commission reports of Det Norske Veritas and the related literature. The coupling between shaft, hull and superstructure vibration is analysed. Phenomena of free and forced vibration are explained by the use of the results obtained from the qualitative analysis. In the conclusion some suggestions are given regarding further investigations of ship vibration.

• Corporate Authors:

  Norske Veritas

  Grenseveien 92, Etterstad
  Oslo 6,   Norway 
• Authors:
  • Senjanovic, I
  • Skaar, K T
• Publication Date: 1975-6

Media Info

• Pagination: p. 5-20

Subject/Index Terms

• TRT Terms: Finite element method; Hulls; Information processing; Propellers; Shafts (Machinery); Ships; Vibration
• Old TRIS Terms: Hull propeller interaction; Shaft vibration
• Subject Areas: Design; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00165477
• Record Type: Publication
• Source Agency: Norske Veritas
• Report/Paper Numbers: Pub. No. 88
• Files: TRIS
• Created Date: Nov 23 1977 12:00AM