Methodology for Analysis of Postshock Oscillations During Pulse-Triggered Instability

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Authors
  1. Harris, P.G.
  2. de Champlain, A.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
Past experimental studies have suggested that the propagating shock wave associated with pulse-triggered instability in solid rocket motors is followed by postshock oscillations. A new methodology was developed to confirm 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 firing, 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.
Keywords
Time-Frequency analysis;Pulse-Triggered Instability;Pulse Triggered Nonlinear Longitudinal Combustion Instability;Compression wave
Date of publication
01 Oct 1999
Number of Pages
13
Reprinted from
Journal of Propulsion and Power, Vol 15, no 5, 1999, p 719-728
DSTKIM No
CA001423
CANDIS No
513218
Format(s):
Hardcopy;Document Image stored on Optical Disk

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