Impact Of A Submarine On The Seabed
Author(s)
J. G. Pelaez, G. R. Valiente & J. J. Reijmers
Abstract
Under certain circumstances it may be desired to place a submarine on the
seabed. In this static situation it is possible to shut down vital systems required
for manoeuvring, hence avoiding the radiation of sound.
This bottoming should be considered as a controlled collision; however this
operation is not without risk. First touch down may be anticipated, but
hydrodynamic aspects will be influenced by the seabed. A change in trim and
speed will result in an impact velocity of vulnerable structures, other than the
reinforced area for initial touch down. The paper focuses on the impact of the aft
rudder with the seabed following from a nose down first touch down.
Depending on forward trim and downward velocity the rotation of the vessel
and velocity of the aft rudder is analysed.
Structural analyses are carried out, including soil mechanics to assess the
property of the seabed.
Nonlinear material behaviour, including strain rate effects is taken into
account. Although the connotation collision suggests otherwise, bottoming shall
be considered as a normal operation. This implies that the impact of the aft
rudder on the seabed shall not result in a permanent set.
With the explicit code LS Dyna the response on several downward velocities
and trim angles is calculated. The criterion of no plastic deformation produces an
operational window for trim and velocity to approach the seabed.
Keywords: submarine, impact, seabed.
Keywords
submarine, impact, seabed
Related Book
Other papers in this volume
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