MIL-J-7093A (Weps)
applied to the chamber and the output measured at the propel lant grain. All the vibration shall be along the longitudinal axis and perpendicular to longitudinal axis. The specified time shall be divided equally among the two directions. The test motors shall be sub jetted to a resonant frequency survey by applying a 1g input and slowly varying the frequency from 5 to 500 cps. The units shall be tested after the resonance survey as follows:
(a) Two (2) units shall be conditioned at -75°F and vibrated at
-75°F with a nominal frequency of 30 cps and a nominal acceleration of 1g for
24 hours. The units shall then be conditioned at 150°F and vibrated at 150°F at the most significant resonant frequency determined for 24 hours at a nominal acceleration of 5g. The units shall then be temperature cycled from -75°F to
150°F (three complete cycles) and subjected to a temperature gradient by placing the units in a temperature conditioning room at 150°F for 2 hours. The units shall then be subjected to 129 acceleration normal to longitudinal axis and 30g longi-
tudinal acceleration. Duration of acceleration shall be 10 ± 2 milliseconds. After the shock test, the motors shall be static test fired at 150°F. Elapsed time between removal from the temperature conditioning room and test firing shall not exceed 20 minutes. The requirements of Table I (3.3.1) shall be met.
(b) The other two (2) units shall be conditioned at 150°F and vibrated at 150°F with a nominal frequency of 30 cps and a nominal acceleration of 1g for 24 hours. The units shall then be conditioned at -75°F and vibrated at
-75°F at the most significant resonant frequency for 24 hours at a nominal accel-
eration of 5g. The units shall then be temperature cycled from 150°F to -75°F (three complete cycles) and subjected to a temperature gradient by placing the
unit in a temperature conditioning room at -75°F for 2 hours. The units shall then be subjected to 12g acceleration normal to longitudinal axis and 30g longitudinal acceleration. Duration of acceleration shall be 10 ± 2 milliseconds. After the
shock test, the motors shall be static test fired at -75°F. Elapsed time between removal
from the last temperature conditioning roam and test firing shall not exceed 20 minutes. The requirements of Table I (3.3.1) shall be met.
4.7. 3 Age Tests. - Two (2) motors shall be temperature conditioned at -75°F 4 units and two (2) motors shall be temperature conditioned at 170°F, each group for 30 days.
At the end of the storage time, the cold units shall be fired at -75°F and the hot
units shall be fired at 150°F. The requirements of Table I (3.3.1) shall be met.
4.7. 4 Acceleration Tests. - Four (4) units shall be placed on a dynamic facility (track or centrifuge and accelerated to 30 g in the longitudinal direction and fired while subjected to acceleration load at ambient temperature. Pressure- time curves shall be obtained.
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4 units
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