Pressure sensing method and apparatus for gun-launched projectile

摘要

A method of determining fluid pressure on a gun-launched projectile relies on deformation of a thin layer of a metallic material that comprises the outer layer of a segment of the projectile body. The axial segment of the projectile body that is selected for pressure measurement is altered or replaced with another axial segment. The altered segment has a thin-walled, structural, metallic sleeve that is concentric with an underlying hollow, metallic cylindrical body. The radially outermost surface of the body underlying the sleeve has a plurality of indentations formed thereon. Measurements of the deformations of the thin-walled sleeve into the indentations in the underlying body are correlated with known deformation and pressure data to determine pressure that was applied to the projectile during its ballistic cycle.

主权项

1. A method of determining fluid pressure on a projectile launched from a tube, comprising:
providing a projectile that includes a metallic cylindrical body wall and a central longitudinal axis, a portion of the cylindrical body wall having an outer diameter and a radial thickness; altering the portion of the cylindrical body wall by reducing the radial thickness and forming a plurality of indentations of known geometry on a radially outermost surface of the reduced thickness portion; fixing a metallic cylindrical sleeve over the reduced thickness portion, the cylindrical sleeve having a same outer diameter as the outer diameter of the portion of the cylindrical body wall; launching the projectile from the tube; deforming the cylindrical sleeve into the plurality of indentations on the reduced thickness portion to produce a deformed cylindrical sleeve; recovering the projectile; measuring deformations in the deformed cylindrical sleeve; and correlating the measured deformations to values of fluid pressure that caused the measured deformations.