Time-frequency analysis of shock data with application to shock response spectrum waveform synthesis

The shock pulse synthesis technique, which produces a pulse which satisfies SRS (shock response spectrum) model parameters while maintaining optimal time-frequency (t-f) Characteristics, is considered. Experimental results illustrate the use of t-f information in shock pulse synthesis. Investigation relating the joint t-f distribution of a transient signal using the RWED (running windowed exponential distribution) appears promising as a tool for providing t-f information. The knowledge obtained from the t-f investigation used in conjunction with the SRS can be applied directly to waveform synthesis of an input waveform of an input pulse for a laboratory test. The resulting synthesized pulse will not only be dynamically equivalent, it will also have normal t-f characteristics, resulting in a more accurate functional test with less chance of unwarranted test failure