English

DTIC ADA013641: Experimental Investigation of Catamaran Cross-Structure Slamming

A model of a conventional catamaran was tested in regular head waves at the Naval Ship Research and Development Center to investigate the cross- structure slamming phenomenon. The severity of slamming was found to be determined principally by the relative motions resulting from the ship's pitch and heave and the relations of these motions with the impacting wave surface. The impact pressure prediction method that was developed on the basis of these findings gave results that agreed reasonably well with the data from model tests and full-scale sea trials on USNS HAYES (T-AGOR-16). Spatial averages of impact pressures obtained from the model and full-scale data provide pressure-area relations for use in determining load criteria for cross-structure bottom plate, panel, and grillage design. The effect of deformability of impact surfaces was also investigated and the results used to provide guidance in the development of load criteria for the structural design of the cross structure in the slamming area.

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