DDAM for Abaqus

A customized interactive graphical Abaqus-based application to allow the DDAM practitioner to complete DDAM projects more effectively

DDAM (Dynamic Design Analysis Method) is a regimented collection of response spectrum procedures that is used by the U.S. Navy to estimate the peak linear response of shipboard equipment when a ship is subjected to an underwater explosion. For example, the figure in the right sidebar shows an Abaqus model of a pump mounted on a box beam, and is typical of the type of shipboard equipment which require shock-resistant design.

Using the DDAM procedure, a practitioner can evaluate the shock resistance of the equipment when subjected to single or multiple external shock spectra.

The DDAM procedure is supported in Abaqus using the customized application called DDAM for Abaqus. DDAM for Abaqus provides DDAM-specific input forms through an interactive user interface as well as specialized output data and tables to allow the DDAM practitioner to complete DDAM projects more effectively.

To apply DDAM, Abaqus/Standard is used to compute the modal response of the equipment subjected to shock. Then, DDAM for Abaqus is used to compute the shock response according to the method using the calculated modal response. For routine analysis, DDAM for Abaqus can be executed in "batch" mode, allowing a user to easily conduct multiple DDAM analyses on different models within a design environment.