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- W2014483220 abstract "An acoustic transmission matrix analysis of sound propagation in a variable area duct with and without flow was recently published [J. H. Miles, J. Acoust. Soc. Am. 69, 1577–1586 0981)]. In this analysis the differential equations governing the propagation of sound in a variable area duct are put in state variable form using acoustic pressure and particle velocity as the state variables. The duct is divided into a number of regions. The region size is selected so that in each region the area variation can be approximated by an exponential area variation. The transmission matrix for each region is obtained by solving the resulting constant coefficient acoustic state variable differential equation. This analysis is compared with an experimental standing wave pressure and phase angle profile obtained at 1560 Hz in a study of sound propagation without flow in a 1.4-m-long hardwall rectangular duct containing a 0.0762-m region of converging-diverging area variation [K. Baumeister et al., AIAA J. 81, 2016 (October 1981)]. The analysis is shown to be in excellent agreement with the data." @default.
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- W2014483220 date "1981-11-01" @default.
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- W2014483220 title "Verification of an acoustic transmission matrix analysis of sound propagation in a variable area duct without flow" @default.
- W2014483220 doi "https://doi.org/10.1121/1.2019002" @default.
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