Effects of carbon dioxide on atmospheric absorption of noise for en-route aircraft and supersonic aircraft

Erik Petersen, Victor Ward Sparrow

Research output: Contribution to conferencePaper

Abstract

The relative importance of carbon dioxide-induced absorption of noise is examined using the Sutherland and Bass 2004 atmospheric absorption model. Three cases are considered: first the vibrational relaxation loss due to CO2 is compared with the vibrational losses due to N2, O2, and O3. The second case compares the vibrational component of absorption to other mechanisms including rotational, classical, and diffusion losses. Finally, the relative contribution of CO2-induced dispersion to total dispersion is evaluated. In all cases a frequency range of 125 to 1000 Hz and an atmosphere of 0 to 18 km are considered. Preliminary results indicate that carbon dioxide is not a major determinant of total absorption for altitudes typical of en-route subsonic aircraft in cruise, but may have a more pronounced effect at the higher altitudes involved for future supersonic aircraft. Additionally, CO2 induced dispersion is found to be non-negligible at higher altitudes. The dominant absorption mechanisms rapidly shift over this range of altitudes, a phenomenon suggesting that the sonic boom shock structure could be influenced by the presence of CO2 close to a cruising supersonic aircraft.

Original languageEnglish (US)
StatePublished - Jan 1 2015
Event44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015 - San Francisco, United States
Duration: Aug 9 2015Aug 12 2015

Other

Other44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015
CountryUnited States
CitySan Francisco
Period8/9/158/12/15

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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    Petersen, E., & Sparrow, V. W. (2015). Effects of carbon dioxide on atmospheric absorption of noise for en-route aircraft and supersonic aircraft. Paper presented at 44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015, San Francisco, United States.