Acoustic Shock Formation in Noise Propagation During Military Aircraft Ground Run-Up Operations

Sie sind hier: Homepage > Suche

Acoustic Shock Formation in Noise Propagation During Military Aircraft Ground Run-Up Operations

Reichman, Brent O. / Gee, Kent L. / Neilsen, Tracianne B. / Hales Swift, S. / Wall, Alan T. / Micah Downing, J. / James, Michael M.

Abstract

A distinctive feature of many high-amplitude jet noise waveforms is the presence of acoustic shocks. Metrics indicative of shock presence, specifically the skewness of the time derivative of the waveform, the average steepening factor, and a new wavelet-based metric called the shock energy fraction, are used to quantify the strength and prevalence of acoustic shocks within waveforms recorded 10–305 m from a tethered military aircraft. The derivative skewness is more sensitive to the presence of the largest and steepest shocks, whereas the average steepening factor and shock energy fraction tend to emphasize aggregate behavior of the entire waveform. These metrics are applied at various engine conditions, over a wide range of angles and distances, to assess the growth and decay of shock waves. This paper represents the first time that the development of these metrics is shown from the near field to the far field, out to 305 m. The responses of these metrics point to significant shock formation occurring through nonlinear propagation out to 76 m from the microphone array reference position. Although these strongest shocks decay past 35 m, continued shock formation and atmospheric absorption can make the steepened nature of the waveform more prominent out to 305 m.

Zugriff

Zugriff prüfen

Verfügbarkeit in meiner Bibliothek prüfen

Bestellung bei Subito €

Exportieren, teilen und zitieren

Dokumentinformationen

Titel :

Acoustic Shock Formation in Noise Propagation During Military Aircraft Ground Run-Up Operations

Beteiligte:

Reichman, Brent O. (Autor:in) / Gee, Kent L. (Autor:in) / Neilsen, Tracianne B. (Autor:in) / Hales Swift, S. (Autor:in) / Wall, Alan T. (Autor:in) / Micah Downing, J. (Autor:in) / James, Michael M. (Autor:in)

Erschienen in:

AIAA Journal ; 60 , 7 ; 4081-4090

Erscheinungsdatum :

2022-05-24

Format / Umfang :

10 pages

ISSN :

1533-385X

DOI :

https://doi.org/10.2514/1.J060307

Medientyp :

Aufsatz (Zeitschrift)