An Alternative Hardware Telemetry Technique
Final technical rept. Mar-Nov 90,
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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The effect of high frequency pressure oscillations on projectile integrity and projectile payloads is a key technical issue in the liquid propellant gun program. A great deal of effort has been directed toward the study of varying the gun system and propellant to alleviate, or at least dampen, pressure oscillations. A project was initiated to study the effects of oscillations on the projectile in a 30-mm Concept VI Regenerative Liquid Propellant gun. A unique hardwire telemetry technique was used to record projectile base pressure and acceleration through the regime in which pressure oscillations occur. A hollow, fiber composite extension rod mounted to the front of the instrumented projectile supports the transducer leads and shields them from the inbore environment. Conventional hardwire telemetry problems such as the projectile impacting with the wire before measureable travel has occurred and the projectile cutting the wire between itself and the bore are eliminated. This report describes the instrumentation and test setup of this unique hardwire telemetry technique. Data recorded using this method are presented for both liquid and solid propelling charges. Effects of high frequency pressure oscillations on the projectile are examined and future telemetry design ideas are discussed.