Scaling for Shock Response of Submarine Equipment
1992
O'Hara, George J. | Cunniff, Patrick F.
Previous analysis and studies have illustrated the difficulty in relating the equipment response at different charge weights for the same shock factor. A recent study (1) has shown a promising scaling law that appears valid over a wide range of charge sizes for the same hull. This report examines how far this range may be extended for both lower charge weights and higher charge weights; compares linear and parabolic least square fits of the data which are in the form of equipment peak acceleration response versus shock factor; introduces new scaling rules for equipment weight and equipment frequency for single-degree of freedom equipment; and points out the hazards of extrapolating over a wide range of shock factor using a limited range of data. Two different model submarine hulls, each designed for approximately the same depth, were used in this study. Each model shows a single-degree of freedom equipment as frame mounted. The earlier study showed that a five frame model is adequate for the purpose of the investigation. These hulls were modeled as lumped parameter systems with a polygon of 36 sides to represent the cylindrical hull. The absolute acceleration of the equipment mass is the measure of response of the equipment as a function of the shock factor for a given charge weight. The variation of the equipment response is examined to establish trends that may affect equipment design.
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