title: Acoustic intensity near a high-powered military jet aircraft.
abstract: The spatial variation in vector acoustic intensity has been calculated between 100 and 3000 Hz near a high-performance military aircraft. With one engine of a tethered F-22A Raptor operating at military power, a tetrahedral intensity probe was moved to 27 locations in the geometric near and mid-fields to obtain the frequency-dependent intensity vector field. The angles of the maximum intensity region rotate from aft to sideline with increasing frequency, becoming less directional above 800 Hz. Between 100 and 400 Hz, which are principal radiation frequencies, the ray-traced dominant source region rapidly contracts and moves upstream, approaching nearly constant behavior by 1000 Hz.
authors.affiliation: Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA tstout@byu.edu, kentgee@byu.edu, tbn@byu.edu.
authors.forename: Trevor A
authors.initials: TA
authors.lastname: Stout
authors.affiliation: Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA tstout@byu.edu, kentgee@byu.edu, tbn@byu.edu.
authors.forename: Kent L
authors.initials: KL
authors.lastname: Gee
authors.affiliation: Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA tstout@byu.edu, kentgee@byu.edu, tbn@byu.edu.
authors.forename: Tracianne B
authors.initials: TB
authors.lastname: Neilsen
authors.affiliation: Air Force Research Laboratory, Battlespace Acoustics Branch, Wright-Patterson AFB, Dayton, Ohio 45433, USAalantwall@gmail.com.
authors.forename: Alan T
authors.initials: AT
authors.lastname: Wall
authors.affiliation: Blue Ridge Research and Consulting, LLC, Asheville, North Carolina 28801, USA michael.james@blueridgeresearch.com.
authors.forename: Michael M
authors.initials: MM
authors.lastname: James