This paper presents the results of an attempt to unveil the mechanism of broaching-to of ships, by a numerical and phenomenological approach with reference to qualitative prediction techniques of nonlinear dynamics. The ship and the ambient water are considered to form a time-invariant dynamic system. Nonlinear effects are simulated in their true forms or by their linear approximations. Four degrees of freedom in surge, sway, roll and yaw have been considered to describe the ship dynamics. The ship manoeuvre through environmental (external) excitations is described by a semi-empirical mathematical model in the form of ordinary differential equations. This model is developed by combining theoretical and experimental modelling techniques. The equations of motion describing the total system dynamics is recast in the compact state space representation, x=Ax. Time domain simulations are performed by numerically integrating these canonised ordinary differential equations. Parametric analyses of the time domain simulation results, carried out by judiciously varying the ship's steady forward speed, relative wave heading, length and amplitude of waves, speed and direction of wind, and substantiated by graphical depictions, reveal a new mechanism for the inception and occurrence of broaching-to.

  • Supplemental Notes:
    • STAB 94, 5th Intl Conf on Stability of Ships and Ocean Vehicles; 7-11 Nov 1994; Florida, USA. Sponsored by SNAME, USA and RINA, UK. Proc. Publ by Florida Inst Technology, USA. Vol 4, session 13 [22 p, 21 ref, 18 fig]
  • Authors:
    • Bandyopadhyay, B
    • Hsiung, C C
  • Publication Date: 1994


  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717498
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM