THE RESULTS OF VIBRATION TESTS OF THE STERN STRUCTURE ON TWIN-SCREW CONTAINER SHIPS

To clarify the vibration characteristics of the propeller bossings of large high-speed twin-screw container ships, the Authors conducted vibration tests on the Mitsubishi-built KK Maru (34,406 dwt) and KG Maru (43,896 dwt) and compared the results with those from container ships built by other shipbuilders and with those from their own calculations. The article gives an account of this work and presents the results and the comparisons. It was found that the vibration of the bossings at the lower frequencies of the bossings in the Mitsubishi ships range from 530 to 630 cycles/min., which is about the same as those of ships of the same size built by other companies. It was also found that the vibration modes of the bossings involve both asymmetrical and symmetrical modes at the same propeller-shaft speed; this is attributed to the effect of phase lag between the propeller exciting forces on the two sides. In a future study, it will be necessary to clarify the relationship between the vibration mode and this phase lag, and to study the support point of the stern tube by making a more detailed comparison between theoretical and experimental results. Order from: BSRA as No. 46,865.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00266817
• Corporate Authors:

  Mitsubishi Heavy Industries Limited

  5-1 Marunouchi, 2-chome, Chiyoda-Ku
  Tokyo 100,   Japan 
• Authors:
  • Nakamura, T
  • Hirayama, T
• Publication Date: 1977

Language

• Japanese

Media Info

• Features: References;
• Pagination: 7 p.
• Serial:
  • Mitsubishi Heavy Industries Technical Review
  • Volume: 14
  • Issue Number: 2
  • ISSN: 0026-6817

Subject/Index Terms

• TRT Terms: Containerships; Excitation; Natural frequency; Propeller shafts; Propellers; Shafts (Machinery); Vibration
• Uncontrolled Terms: Natural frequencies
• Old TRIS Terms: Propeller bosses; Propeller excitation; Propeller shaft vibration; Shaft vibration; Twin screws
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00170038
• Record Type: Publication
• Source Agency: British Ship Research Association
• Files: TRIS
• Created Date: Feb 16 1978 12:00AM