Submarines are designed to be robust enough to survive shocks due to non-contacting underwater explosions (UNDEX). Traditionally, equipment is designed using prescribed accelerations, which may or may not allow for structural dynamic effects. These techniques are mature, but predominantly based on results from barge testing that is several decades old. Importantly, the prescribed accelerations are intended for discrete "lumped mass" equipment, and are difficult to apply to distributed items like torpedo tubes. This can result in significant overdesign, or – worse – an insufficiently robust submarine.
Advances in computational methods, coupled to very fast modern computers have resulted in Fluid Structure Interaction (FSI) being a credible tool to enhance significantly understanding of real structural behaviour when subjected to UNDEX.
Scope of the work
This project would investigate the application of FSI to UNDEX modelling, leading to more appropriate acceleration and loading profiles for UNDEX of given magnitude and standoff.
Which SEA program would benefit and how? Final outcome and impact (eg TRL increase?)
SEA1000 – TRL probably 3. Target TRL: 6
Collins – Analysis could be used to gain a better understanding of real shock resistance to allow for modifications to the platform.