Acoustic Holography Mapping of Jet Plumes - 04/07/07

AFRL has selected BRRC to develop innovative measurement and analysis methods to characterize and map the noise emitted from jet engines.

Description

The current and next generation military jet aircraft are exposing both ground maintenance personnel and the community at large to high levels of noise. The DoD is funding research to develop advanced modeling tools for community noise exposure (SERDP SON Number CPSON-02-04) and for noise reduction techniques (SERDP SON Number WPSON-07-04). As these tools are being developed to address to the overall military jet noise problem, the lack of understanding of the actual jet noise source has been identified as a limiting factor. For these tools to achieve their full potential in addressing the noise problem, innovative measurement and analysis methods are necessary to characterize and map the noise source region in the jet. Traditional measurement methods do not provide sufficient information to characterize the complex structure and content of the jet noise plume. Near-field acoustic holography (NAH) offers the best general method to measuring the magnitude, directivity, and spectral content as well as the spatial distribution of the noise emitted from a jet.

Exploratory Measurements of F16	Acoustic Map of Jet Plume
Partner: BYU Acoustics Research Group Sponsor: Air Force Research Laboratory - Wright-Patterson AFB, OH