Initial results from the variable intensity sonic boom propagation database

Edward A. Haering, Larry J. Cliatt, Thomas J. Bunce, Thomas B. Gabrielson, Victor W. Sparrow, Lance L. Locey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

An extensive sonic boom propagation database with low-to normal-intensity booms (overpressures of 0.08 lbf/ft2 to 2.20 lbf/ft2) was collected for propagation code validation, and initial results and flight research techniques are presented. Several arrays of microphones were used, including a 10 m tall tower to measure shock wave directionality and the effect of height above ground on acoustic level. A sailplane was employed to measure sonic booms above and within the atmospheric turbulent boundary layer, and the sailplane was positioned to intercept the shock waves between the supersonic airplane and the ground sensors. Sailplane and ground-level sonic boom recordings were used to generate atmospheric turbulence filter functions showing excellent agreement with ground measurements. The sonic boom prediction software PCBoom4 was employed as a preflight planning tool using preflight weather data. The measured data of shock wave directionality, arrival time, and overpressure gave excellent agreement with the PCBoom4-calculated results using the measured aircraft and atmospheric data as inputs. C-weighted acoustic levels generally decreased with increasing height above the ground. A-weighted and perceived levels usually were at a minimum for a height where the elevated-microphone pressure-rise time history was the straightest, which is a result of incident and groundreflected shock waves interacting.

Original languageEnglish (US)
Title of host publication14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)
StatePublished - Dec 1 2008
Event14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference) - Vancouver, BC, Canada
Duration: May 5 2008May 7 2008

Publication series

Name14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)

Other

Other14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)
CountryCanada
CityVancouver, BC
Period5/5/085/7/08

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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