DDAM
Encyclopedia
DDAM stands for the Dynamic Design Analysis Method and is the primary method used by the US Navy for UNDEX
shock design of foundation structures. The document describing the method, NAVSEA 0908-LP-000-3010, Rev 1., is public release, but the values needed to actually perform an analysis are classified.
The DDAM is based on a standard spectral response analysis
technology but uses a modified modal summation technique called the NRL Sum. The NRL Sum differs from the similar Root Sum Squared method used by most modal summation methods by holding the largest value aside during the RSS and then adding it into the sum.
Underwater explosion
An underwater explosion, also known as an UNDEX, is an explosion beneath the surface of water. The type of explosion may be chemical or nuclear...
shock design of foundation structures. The document describing the method, NAVSEA 0908-LP-000-3010, Rev 1., is public release, but the values needed to actually perform an analysis are classified.
The DDAM is based on a standard spectral response analysis
Response analysis
Response Analysis refers to the analysis of mitigation plans for emergency or disaster situations. These emergencies or disasters may be naturally occurring or man-made...
technology but uses a modified modal summation technique called the NRL Sum. The NRL Sum differs from the similar Root Sum Squared method used by most modal summation methods by holding the largest value aside during the RSS and then adding it into the sum.