When investigating the antisymmetric response of a ship to waves it is necessary to describe its behaviour in dynamical terms. In practice this requires that natural frequencies and principal nodes be calculated. A numerical technique which is based on the assumption that the hull moves in vacuo as a nonuniform Timoshenko beam was therefore devised. This technique admits coupling of bending and twisting, and also contains an allowance for warping stiffness. The vibration problem of a conservative uniform beam is solved exactly. The solution provides accurate data against which the numerical method can be tested. the numerical method is also shown to agree with results predicted by Ohtaka, Kumai, Ushijima and Ohji, both for a uniform beam and a ship hull. These writers used a technique in which no allowance is made for warping stiffness. Finally it is shown how a direct check can be made of the orthogonality of computed nodes. Order from BSRA as No. 54,322.

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  • Corporate Authors:

    Royal Institution of Naval Architects, England

    10 Upper Belgrave Street
    London SW1X 8BQ,   England 
  • Authors:
    • Bishop, RED
    • Price, W G
    • Temarel, P
  • Publication Date: 1980-7

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  • Accession Number: 00329913
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM