Bicoherence analysis of model-scale jet noise

Kent L. Gee, Anthony A. Atchley, Lauren E. Falco, Micah R. Shepherd, Lawrence S. Ukeiley, Bernard J. Jansen, John M. Seiner

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Bicoherence analysis has been used to characterize nonlinear effects in the propagation of noise from a model-scale, Mach-2.0, unheated jet. Nonlinear propagation effects are predominantly limited to regions near the peak directivity angle for this jet source and propagation range. The analysis also examines the practice of identifying nonlinear propagation by comparing spectra measured at two different distances and assuming far-field, linear propagation between them. This spectral comparison method can lead to erroneous conclusions regarding the role of nonlinearity when the observations are made in the geometric near field of an extended, directional radiator, such as a jet.

Original languageEnglish (US)
Pages (from-to)EL211-EL216
JournalJournal of the Acoustical Society of America
Issue number5
StatePublished - Nov 2010

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics


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