Quantifying nonlinearity in the propagation of noise from military jet aircraft

Kent L. Gee, Victor Ward Sparrow

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

5 Scopus citations

Abstract

Because of the high noise levels radiated by military jet aircraft, it has been hypothesized that nonlinearity influences the propagation of the noise. A numerical model, which accounts for second-order cumulative nonlinearity, atmospheric absorption and dispersion, and geometrical spreading, has been developed to propagate jet noise waveforms. Numerical propagation of recorded waveforms from recent static engine run-up measurements demonstrates significant waveform steepening and an accompanying transfer of spectral energy to high frequencies that agrees well with measured spectra. Furthermore, the measured and nonlinearly-predicted waveforms are perceived to be significantly "louder" or "more annoying" than linearly-predicted waveforms, despite the fact that standard metrics such as overall sound pressure level (with flat, A, and C weighting) and Mark-VII perceived loudness show little difference between linearly-and nonlinearly-predicted spectra. The results of this study demonstrate the need for additional investigations with alternate metrics that more closely relate to perceived annoyance or loudness of high-amplitude jet noise.

Original languageEnglish (US)
Title of host publication19th National Conference on Noise Control Engineering 2005, Noise-Con 05
Pages397-404
Number of pages8
Volume1
StatePublished - 2005
Event19th National Conference on Noise Control Engineering 2005, Noise-Con 2005 - Minneapolis, MN, United States
Duration: Oct 15 2005Oct 17 2005

Other

Other19th National Conference on Noise Control Engineering 2005, Noise-Con 2005
CountryUnited States
CityMinneapolis, MN
Period10/15/0510/17/05

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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