International regulations require that a lifeboat for free-fall launching should be capable of rendering protection against harmful accelerations when it is launched with its full complement of persons and equipment from at least the maximum designed height. Through model and full scale tests, much has been studied about the behaviour of these lifeboats, however these tests are very expensive to conduct and the complete behaviour of the boat is sometimes difficult to discern. Therefore a mathematical model can be very effective to quantitatively evaluate the kinematics of the free-fall lifeboat. In this paper, a mathematical model is presented where impact has been evaluated for a lifeboat hull on the basis of the concept of a momentum theory, and the falling motion of the boat has been computed by solving the motion differential equations in the time domain. From the numerical simulation, trajectories of the boat and time histories of accelerations in different positions and directions are obtained. Model experiments conducted to verify the numerical results showed good agreement between the numerical and experimental results.

  • Supplemental Notes:
    • J Soc Naval Arch Japan, v 178, Dec 1995, p 193 [9 p, 8 ref, 1 tab, 10 fig]
  • Authors:
    • Arai, M
    • Khondoker, M R
    • INOUE, Y
  • Publication Date: 1995


  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00728027
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Nov 4 1996 12:00AM