The Shock Response Spectrum at Low Frequencies

The slope of the shock spectrum at low frequencies is typically evaluated by using a veIl known relationship between the undamped residual shock response spectrum and the 2agnitude of the Fourier.spectrum [1]. This has led to the common belief that the shock response of shocks with a low velocity change, like a ?yrotechnic shock, will have a low frequency .lope of 12 dB/octave. But anyone who has examined these shocks has seen data which ~iolates this assumption. Several suggestions :-a':e been offered to explain the slopes which ~re different from 12 dB/octave including: " The spectrum doesn't really roll off at 12 dB/octave