Dynamic Design Analysis Method
![All mission-essential equipment on board Naval ships and submarines must be qualified for shock loads caused by underwater explosions.](/Images/godic/202501/08/Underwater_Explosion_with_a_Blue_Water_Navy_Ship2415.jpg")
The Dynamic Design Analysis Method (DDAM) is a US Navy-developed analytical procedure for evaluating the design of equipment subject to dynamic loading caused by underwater explosions (UNDEX). The analysis uses a form of shock spectrum analysis that estimates the dynamic response of a component to shock loading caused by the sudden movement of a naval vessel. The analytical process simulates the interaction between the shock-loaded component and its fixed structure, and it is a standard naval engineering procedure for shipboard structural dynamics.