Rossiter’s formula: A simple spectral model for a complex amplitude modulation process?

摘要: Spectral analysis of pressure signals recorded for high subsonic compressible flows past open cavities generally reveals frequency components strong magnitudes (Rossiter modes). These are not multiples each other in the case shallow cavities. This nonharmonic property is examined through a nonlinear modeling spectral distributions. For that purpose, signal processing interpretation Rossiter formula developed, which combines distortion and amplitude modulation. The consequences this new on prediction frequencies, mode identification, interactions discussed as well underlying physical mechanisms.