Abstract
This study addresses the characterization of nonlinearity in military jet aircraft noise data in both the near and far fields. Previous work [Gee et al., J. Acoust. Soc. Am. 123, 4082–4093 (2008)] showed using a generalized Burgers equation-based model that nonlinear propagation effects were significant in far-field, ground run-up data from the F-22 Raptor for different engine powers and propagation angles. In this investigation, those findings are further vetted using data collected from the F-35 Joint Strike Fighter over greater propagation ranges and angles. The nonlinear nature of the near fields of the F-22 and F-35 jet noise is characterized through the calculation of maps of the waveform and waveform time derivative skewness as well as the crest factor. These results provide insights regarding short-range shock formation and the apparent origin of the nonlinearity-producing region of the plume. [Work supported by the Air Force Research Laboratory.]
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