FREE AND FORCED DAMPED SHIP-VIBRATIONS, TAKING WARPING-FORCE TORSION INTO ACCOUNT-PART I

This paper, an abridgement of the Author's inaugural dissertation at Berlin Technical University, is based on investigations made at AG Weser, Bremen, for the Federal Government. Differential equations are derived for the forced damped longitudinal vibrations and generally-coupled bending/torsional vibrations of the hull, which is considered as a thin-walled beam of slightly variable cross-section. The effects of shear and rotational inertia during transverse vibration, and the influence of the inertia forces resulting from warping and shear-deformation (according to warping-force torsion theory) during torsional vibration, are taken into account. The differential equations are applicable to both open and closed cross-sections. Part I of the paper is arranged under the following headings, the Introduction including a review of the literature: 1) Introduction. 2) Forced Damped Ship-Vibrations. 2.1 Damping Mechanism; 2.2. Static Equilibrium Conditions; 2.3. The Vibration Equations. 3) Free Ship-Vibration Calculations. Under this last heading, the calculation, by the finite-difference method, of the eigen-values and corresponding eigen-vectors for the various free undamped vibrtions of a 93,000-ton icebreaking bulk-carrier is described. The response to this ship's bow-impact loadings is given as envelopes of the resulting maximum forces or moments over the ship's length. Order from: BSRA as No. 47,365.

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  • Corporate Authors:

    Seehafen-Verlag Erik Blumenfeld

    Celsiusweg 15, Postfach 1347
    2000 Hamburg 50,   Germany 
  • Authors:
    • Varjravelu, P
  • Publication Date: 1977-8

Language

  • German

Media Info

  • Features: References;
  • Pagination: 6 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00173041
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Apr 12 1978 12:00AM