AN EXPERIMENTAL STUDY OF THE DYNAMIC HOLDING CAPABILITY CHARACTERISTICS OF ANCHORS

When an anchor is pulled shipward to try to obtain its good bottom hold, or when a ship is lying at anchor in a strong wind, the forces acting on the anchor are dynamical ones caused by ship motions. We used model experiments to investigate the seabed behavior of anchors under such circumstances. The results showed that 1) when an anchor is pulled shipward its bottom penetration depth and stabilizing tendency attained are relative to its retrieval speed, and therefore, if we can measure the incident anchor cable strain we should be able to determine whether or not the anchor has a good bite; and 2) when an anchor is subject to the dynamical forces generated by its being brought in, it drags quickly, but does not rotate or come out of the bottom, and retains its original bottom hold when the dynamic forces cease, and its dragging distance is less than several times its length. In our study we found that anchor holding resistance could not simply be analyzed and that further experimental and theoretical study is necessary.

  • Supplemental Notes:
    • Published in 30th Anniversary Commemorative Research Study Compilation.
  • Corporate Authors:

    Japan Institute of Navigation

    Tokyo University of Mercantile Marine, 2-1-6 Etchujima, Koto-ku
    Tokyo,   Japan  135-8533
  • Authors:
    • Kikutani, H
    • OIKAWA, K
    • Nomura, S
  • Publication Date: 1978-11

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00193554
  • Record Type: Publication
  • Source Agency: Japan Institute of Navigation
  • Files: TRIS
  • Created Date: Apr 25 1979 12:00AM