Abstract
Past experimental studies have suggested that the propagatingshock wave associated with pulse-triggered instability in solid rocket motors is followed by postshock oscillations.A new methodologywas developed to con rm the existence and evaluate the nature of these oscillations. This methodology is composed of a new time-marching frequency and a time-frequency analysis. The new time-marching analysis follows the evolution of the time-averaged frequency content of the postshock oscillations throughout a ring, whereas with the time-frequency analysis, it is possible to obtain a qualitative estimate of the temporal evolution of the amplitude of the frequency content of postshock oscillations for a single shock-wave cycle. The new methodology was developed and tested with model signals and then successfully applied to a sample experimental signal.
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