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Delayed Arming with a Velocity-Square Retarded Mechanical Integrating Accelerometer,
MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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A mechanical integrating accelerometer MIA based on the rolamite approach can be used for delaying the arming of an aerial bomb. Substantial miniaturization of the MIA is feasible in a system in which the moving part of the rolamite is subjected to a retardation proportional to the square of the velocity of the moving part. Analytical details are given for three exemplary classes of motion of the bomb constant deceleration, exponentially decaying deceleration and velocity-squared deceleration of the bomb. The relationship between the distance travelled by the moving part of the MIA and the separation between munition and aircraft is found to depend on the form of the deceleration of the bomb. However, bounds for the relationship exist and are obtained explicitly. From these bounds, it is inferred that the relationship is almost independent of the initial motion of the bomb. Further, the relationship is shown to be invariant with respect to a special but relatively large class of motions of the bomb. This includes the practical case of the munition experiencing a drag obeying the usual velocity-square law of aerodynamics. Author
APPROVED FOR PUBLIC RELEASE