COMPLEX SIX-DEGREES OF FREEDOM NONLINEAR SHIP ROLLING

In order to overcome difficulties in using solely perturbation methods or numerical simulations to analyze large amplitude (nonlinear) ship roll motion, an alternative approach was used to study the effect of linear coupling between sway and yaw, and nonlinear rolling motion and the frequency dependence of the hydrodynamics. This approach utilized numerical path following techniques to directly study the nonlinear three degree of freedom (sway, roll and yaw) asymmetric ship motions equations with linear frequency domain hydrodynamics on a frequency by frequency basis. This paper describes recent research which expands the previous work to consider the complete six-degrees of freedom equations of nonlinear ship motion including Euler angle kinematics. The current status of the physical modelling is that frequency dependent linear added mass, damping and wave exciting forces are supplemented by nonlinear restoring moment curves and a harmonic (ie, a one term) approximation to the parametric excitation due to vessel flare at the waterline. Although studying the bounded steady state behaviour will be an important result of this project, this work also includes an assessment of the local stability of these bounded solutions.

  • Supplemental Notes:
    • STAB 94, 5th Intl Conf on Stability of Ships and Ocean Vehicles; 7-11 Nov 1994; Melbourne, Florida, USA. Sponsored by SNAME, USA and RINA, UK. Procs. Publ by Florida Inst Technology, USA. Vol 1, Session 3 [17 p, 11 ref, 13 fig]
  • Authors:
    • Falzarano, J M
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00710967
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM