Transient Flexural Vibrations of Ship-Like Structures Exposed to Underwater Explosions

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Abstract
The flexural vibrations of ship-like structures are easily excited by underwater explosions, particularly if the explosion bubble period approximately synchronizes with a period of flexural vibration. A summary of the theoretical analysis shows how the transient motions are related to the principal vibration modes of the structure, and to the distribution and history of the applied pressures. The latter depend on the size, depth, and relative position of the explosive. Experiments on small idealized ship and submarine models are described which vary the weight, depth, and position of the explosive, and which measure the instantaneous deformations of the structure with strain gauges connected into special bridge circuits to yield the normal coordinates associated with the principal flexural vibration modes. Comparison of the theory and experiments verify the theory as applied to the fundamental flexural mode, and with less precision, as applied to the higher flexural modes. The principal mode patterns and the history of the explosion bubble are verified by independent experiments.

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