HARACTERIZATION of the aeroacoustic noise source region in turbulent jets using
acoustical measurements is most often carried out using directional microphone arrays …

A method is presented to suppress grating lobes in beamforming using phase unwrapping
and array interpolation. When the phase of each cross spectrum is successfully unwrapped …

I. Introduction fforts to better understand and model the radiation of jet noise using
wavepacket-like distributions have seen increased interest over the past decade. 1-5 …

The purpose of this work is to examine the noise source distributions of shock-containing
supersonic jets at various pressure ratios corresponding to fully expanded Mach numbers …

Supersonic jet noise reduction efforts benefit from targeted source feature extraction and
high-resolution acoustic imaging. Another useful tool for feature extraction is partial field …

Energy quantities, which are calculated from pressure and particle velocity, yield a great
deal of information about acoustic fields. Errors in pressure or particle velocity estimation …

I. Introduction avepacket representations of jet noise strive to provide a model consistent
with linear stability theory of the mean flow1, 2 that incorporates features of the highly …

Extensive study by the jet noise community of the sound fields produced by both laboratory
and full-scale jets is on-going. One aim of these studies is to propose potential equivalent …

Sound generation and radiation properties are studied of full-scale tactical jet engine noise.
This is motivated by the high sound exposure levels from jet noise, particularly for tactical …

This paper is an abridgment of chapter five of Dr. Harker's Ph. D dissertation Ref.[1]. The
goal is to introduce the concept of wavepackets and their application to jet noise. While …