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W. Scott Walton Ballistic Technology Officer US Army Aberdeen Test Center

The Use of Multiple Technology Measurements to Diagnose Weapn Chamber Pressure Measurement Anomalies in Piezo-Electric Pressure Transducers. W. Scott Walton Ballistic Technology Officer US Army Aberdeen Test Center.

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W. Scott Walton Ballistic Technology Officer US Army Aberdeen Test Center

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  1. The Use of Multiple Technology Measurements to Diagnose Weapn Chamber Pressure Measurement Anomalies in Piezo-Electric Pressure Transducers W. Scott Walton Ballistic Technology Officer US Army Aberdeen Test Center

  2. Vital Importance of Chamber Pressure Measurement to US Army Weapons Development • Used for critical decsions between crew safety and combat effectiveness • A 2% error causes: • 6% change in fatique life • 4% change in range • 3% change in weight • It is currently the most demanding voltage amplitude measurement made with ballistic instrumentation

  3. Technical Objectives • LONG TERM GOAL: IMPROVE CHAMBER PRESSURE MEASSUREMENT ACCURACY BY A FACTOR OF 20X (FROM +2% TO +0.1%) i.e. MAKE PRESSURE AS CONSISTENT AS VELOCITY • SHORT TERM GOAL: MAKE EFFECT OF 65 GRAM CHANGE IN 8.6 Kg CHARGE WEIGHT (AS DONE IN PROPELLANT ASSESSMENT TESTING) MORE SIGNIFICANT THAN THE EFFECT OF EXCHANGING TRANSDUCERS ( BOTH ABOUT 1%)

  4. CONTROL RDS: ALL TEMPERATURES 1996-1998 1740 1720 Tube 4988 1700 1680 1660 Tube 5022 1640 1620 1600 Tube 6056 1580 Muzz Velocity, mps 1560 Tube 8821 1540 1520 1500 4000 4300 4600 4900 5200 5500 5800 6100 6400 Rear Pressure, bars

  5. Unusually Consistent Ammunition Lots 1995-1998 Data

  6. 0.5% Discrepancy

  7. 1.9% Discrepancy

  8. ILLUSTRATION OF GAGE-GAGE AND WITHIN-GAGE VARIATION IN STATIC PRESSURE LABORATORY TESTING

  9. 0.25% Discrepancy

  10. 8.6% Discrepancy

  11. CONCLUSIONS • BETTER CHAMBER PRESSURE TRANSDUCERS ARE NEEDED • USE OF CRUSHER, PIEZO, STRAIN, AND VELOCITY MEASUREMENTS IMPROVES ACCURACY • ON ‘GOOD DAYS’, ALL MEASUREMENTS AGREE • ON ‘BAD DAYS’, THE PROBLEM MEASUREMENTS CAN BE IDENTIFIED

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