The serious consequence of ship collisions necessitates the development of regulations
and requirements for the subdivision and structural design of ships to reduce damage and
environmental pollution from collision, and improve safety. The on-going revision of
IMO regulations on oil outflow performance and damage stability in grounding and
collision is focused on a transition to probabilistic performance-based standards. This
thesis addresses one aspect of this problem, a simplified collision model sufficient to
predict collision damage, and fast enough to be used in probabilistic analysis requiring
thousands of collision simulations.
The simplified collision model (SIMCOL) developed and evaluated in this thesis is based
on a time domain simultaneous solution of external dynamics and internal deformation
mechanics. The external sub-model uses a three-degree of freedom system for ship
dynamics. The internal sub-model determines reacting forces from side and bulkhead
structures using mechanisms adapted from Rosenblatt and McDermott, and absorbed
energy by decks, bottoms and stringers calculated using the Minorsky correlation as
modified by Reardon and Sprung.
SIMCOL is applied to a series of collision scenarios. Results are compared with MIT’s
DAMAGE, a Danish Technical University (DTU) model and ALPS/SCOL. SIMCOL
provides a fast, consistent and reasonable result for ship collision analysis. An actual
collision case is used in an initial attempt to validate the model.
This research is sponsored by the Society of Naval Architects and Marine Engineers
(SNAME) and the Ship Structure Committee (SSC).
The serious consequence of ship collisions necessitates the development of regulationsand requirements for the subdivision and structural design of ships to reduce damage andenvironmental pollution from collision, and improve safety. The on-going revision ofIMO regulations on oil outflow performance and damage stability in grounding andcollision is focused on a transition to probabilistic performance-based standards. Thisthesis addresses one aspect of this problem, a simplified collision model sufficient topredict collision damage, and fast enough to be used in probabilistic analysis requiringthousands of collision simulations.The simplified collision model (SIMCOL) developed and evaluated in this thesis is basedon a time domain simultaneous solution of external dynamics and internal deformationmechanics. The external sub-model uses a three-degree of freedom system for shipdynamics. The internal sub-model determines reacting forces from side and bulkheadstructures using mechanisms adapted from Rosenblatt and McDermott, and absorbedenergy by decks, bottoms and stringers calculated using the Minorsky correlation asmodified by Reardon and Sprung.SIMCOL is applied to a series of collision scenarios. Results are compared with MIT’sDAMAGE, a Danish Technical University (DTU) model and ALPS/SCOL. SIMCOLprovides a fast, consistent and reasonable result for ship collision analysis. An actualcollision case is used in an initial attempt to validate the model.This research is sponsored by the Society of Naval Architects and Marine Engineers(SNAME) and the Ship Structure Committee (SSC).
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