Published near-? eld analyses of full-scale jet noise are limited, and the application of
observed laboratory-scale phenomena to full-scale jets is not well understood. To obtain a …

ETR= engine thrust request, in% OASPL= overall sound pressure level, dB re 20 µPa OTO=
one-third octave, dB re 20 µPa݌ ሺݐሻ= pressure waveform, in Pa ߲݌/߲ݐ= time derivative of …

The skewness of the first time derivative of a pressure waveform, or derivative skewness,
has been used previously to describe the presence of shock-like content in jet and rocket …

Crackle, the impulsive quality sometimes present in supersonic jet noise, has traditionally
been defined in terms of the pressure waveform skewness. However, recent work has …

Difficulties arise in attempting to discern the effects of nonlinearity in near-field jet-noise
measurements due to the complicated source structure of high-velocity jets. This article …

Skewness values for the pressure time derivative are greater at ground-based
measurements near a tactical aircraft than they are at nearby off-ground locations. A …

In this paper, quantitative understanding of a frequency-domain nonlinearity indicator is
developed. The indicator is derived from an ensemble-averaged, frequency-domain version …

The nonlinear evolution of high-amplitude broadband noise is important to the
psychoacoustic perception, usually annoyance, of high-speed jet noise. One method to …

For the past several years, the National Aeronautics and Space Administration (NASA) has
been designing a crew launch vehicle that has the capability of going beyond lower-Earth …

Near-field acoustical holography methods are used to predict sound radiation from an
engine installed on a high-performance military fighter aircraft. Cylindrical holography …