The assessment, in the design state, of propeller-induced vibration entails not only an evaluation of excitation levels as discussed in Part I, but also the investigation of the dynamic response characteristics of the ship's structure. The intelligent use of current theoretical capabilities can predict troublesome resonances, give a qualitative assessment of their severity, and provide an opportunity for their avoidance. Developments in the design of ships have not only made propeller-operating conditions more demanding, but have also increased the risk of troublesome structural resonances. The Authors (of Lloyd's Register) discuss methods of assessing structural response to propeller-induced excitations, with particular reference to complex vibration analyses and finite-element methods, under the headings:--1. Introduction. 2. Component Analysis (1--Local Vibration Response. 2--Shafting Vibration. 3--Superstructure Vibration. 4--Vibration of Other Major Structural Assemblies. 5--Main Hull Girder Vibration). 3. Integrated Structural Models. 4. Example Applications. 5. Conclusions. Under 5., it is mentioned that it would seem essential for the marine industry to anticipate the development of national and international standards for limiting vibration levels. The principal procedures discussed in Parts I and II of this paper should together provide the designer with a practical but high-level approach to the prediction and evaluation of vibration problems at the design stage. Such methods, though not guaranteeing the complete absence of excessive vibration, can significantly reduce the risk of its occurrence. The full value of the methods in a production environment cannot be realised unless their capabilities and limitations are properly understood by those making the design and production decisions. Order from BSRA as No. 52,520.

  • Supplemental Notes:
    • Paper presented at the Symposium on Propeller Induced Ship Vibration, London, 11-13 December 1979.
  • Corporate Authors:

    Royal Institution of Naval Architects, England

    10 Upper Belgrave Street
    London SW1X 8BQ,   England 
  • Authors:
    • Wills, CMR
    • Sole, G H
    • Anthony, M G
  • Publication Date: 1979

Media Info

  • Features: References;
  • Pagination: 4 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00311538
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: Paper No. 13 Conf Paper
  • Files: TRIS
  • Created Date: Jun 26 1980 12:00AM