A method for quantitative analysis of the effects of ageing on the propulsion efficiency of ships' machinery has been derived from consideration of the total efficiency of the ship evaluated from the energy viewpoint. The method was applied to two vessels in service, one of which had a fixed pitch propeller (FPP) and the other, a controllable pitch propeller (CPP), the trend of ageing effect between the two ships was compared by means of regression analysis. The results show that the trends of ageing effect differ considerably due to differences of ship size and propeller type. They are significantly less for the ship fitted with the controllable pitch propeller. Order from BSRA as No. 54,573.

  • Corporate Authors:

    Sumitomo Shipbuilding and Machinery Company, Ltd

    2-2-1 Ohtemachi, Chiyodaku, New Ohtemachi Building
    Tokyo,   Japan 
  • Authors:
    • Yokota, K
    • OKUBO, S
  • Publication Date: 1980-8


  • Japanese

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00329900
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM