SAWTOOTH AND HALF-SINE SHOCK IMPULSES FROM THE NAVY SHOCK MACHINE FOR MEDIUMWEIGHT EQUIPMENT
NAVAL RESEARCH LAB WASHINGTON DC
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A shock test is frequently specified as an acceleration pulse of controlled shape and magnitude and which has a desired shock spectrum. A description is given as to how the Navy High Impact Shock Machine for Medium weight Equipment can be made to provide acceleration pulses of a half-sine or sawtooth shape by inserting elastic or plastic materials between various impacting surfaces. Details as to the shape of the inserts are given for nominal 6-millisecond sawtooth pulses having amplitudes up to 60 g, and for relatively long 10-20 milliseconds low-amplitude half-sine pulses. A maximum velocity-change up to 8ftsec is possible. The acceleration amplitudes involved in stopping the anvil are generally small compared with the initial pulses. Displacements are limited to 3 inches.
- Test Facilities, Equipment and Methods