The development of very large ships in recent years has brought about the reduction of the natural frequency of two-node vertical oscillation, denoted as "N". It means that "N" approaches the region of the wave energy spectrum which has relatively high energy content. As a result, the wave-excited vibration (springing) has become a much more serious phenomenon than formerly in actual ship operation. In connection with springing, NPL has developed a hydrodynamic vibration damper (hereafter abbreviated as "HVD") as a damping device, but the detail of HVD has not been published. This paper describes the theory and the method to design HVD, and the trial design of HVD for 280,000 dwt VLCC is attempted to study its usefulness. The conclusions reached in this study are summarized as follows: 1. In large ships, it is easily feasible, from the viewpoint of their size and dimension, to install a highly effective HVD as a damping device. 2. It is also possible to design, with the method indicated in this paper, a HVD which is capable of as high an efficiency as desired.

  • Corporate Authors:

    Mitsui Shipbuilding and Engineering, Limited

    6-4 Tsukiji, 5-chome, Chuo-ku
    Tokyo,   Japan 

    Mitsui Shipbuilding and Engineering Company, Ltd

    6-4 Tsukiji, 5-chome, Chuo-ku
    Tokyo,   Japan 
  • Authors:
    • Hirano, M
  • Publication Date: 1974


  • Japanese

Media Info

  • Pagination: p. 15-20
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00057551
  • Record Type: Publication
  • Source Agency: Mitsui Shipbuilding and Engineering Company, Ltd
  • Files: TRIS
  • Created Date: Aug 28 1974 12:00AM