SHIP STABILITY AND ROLLING MOTION: CASE OF CONSTANT HEELING-MOMENT

The Authors, of Trieste University, describe a ship's rolling motion by means of a non-linear differential equation of the second order; the equation includes the effects of quadratic damping and of a constant heeling moment. The righting moment is expressed by a fifth-degree polynomial that gives the best fit to the actual statical stability curve. The stability of the equilibrium position is discussed with the Routh-Hurwitz criterion, and Lyapunov's direct method is used for finding the domain of asymptotic stability (both procedures are explained in appendices). The well-known criteria for the ship's statical and dynamical stability are obtained as particular cases of the general theory. As an example of the numerical application of the Author's theory, the stability of a small cargo-ship is investigated. Order from BSRA as No. 49,225.

  • Corporate Authors:

    Consiglio Nazionale delle Ricerche

    Via Matteotti 55
    34071 Cormons,   Italy 
  • Authors:
    • Cardo, A
    • Ceshia, M
  • Publication Date: 1978-1

Language

  • Italian

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00185315
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jan 13 1979 12:00AM