A MECHANICAL SHOCK PULSE SURVEY.
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J ELECTRONIC COMPONENTS LAB
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A mechanical shock pulse survey of the shock pulse shapes produced by eight mechanical shock machines used in the evaluation of electronic piece parts is discussed. The shock machines include the general types of free-fall, pendulum, and cam-activated. The shock pulses range in nominal time duration of the major positive pulse from 0.60 to 32.00 milliseconds and peak amplitudes from 40 to 1150 gravitational units. Details of the recording and instrumentation techniques employed to obtain survey data are presented. Instrumentation calibration and problems of undershoot are also discussed, as is the reduction of the raw data from their original collected form to a form suitable for analysis and storage. The methods of analysis, quantitative and qualitative, of the shock pulse curves obtained from the eight mechanical shock machines surveyed were to first determine shock pulse curvess amplitudefrequency spectrum by use of a special-purpose analog computer which is designed specifically to compute Fourier integrals. The frequency spectrum is then converted to a Bode Diagram from which a graphical comparison of the shock pulse is made. Analysis of the results of the mechanical shock pulse survey shows that major characteristics of the amplitude-frequency spectrum of each mechanical shock machine surveyed are mainly dependent on peak amplitude, shock pulse duration, and the area under the shock pulse curve. Author
- Electrical and Electronic Equipment
- Test Facilities, Equipment and Methods