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- W1619864158 abstract "A discrete frequency study is made of the influence of source characteristics on the optimal properties of acoustically lined uniform and two section ducts. Two simplified sources, a plane wave and a monopole, are considered in some detail and over a greater frequency range than has been previously studied. Source and termination impedance effects are given limited examination. An example of a turbomachinery source and three associated source variants is also presented. Optimal liner designs based on modal theory approach the Cremer criterion at low frequencies and the geometric acoustics limit at high frequencies. Over an intermediate frequency range, optimal two section liners produced higher transmission losses than did the uniform configurations. Source distribution effects were found to have a significant effect on optimal liner design, but source and termination impedance effects appear to be relatively unimportant." @default.
- W1619864158 created "2016-06-24" @default.
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- W1619864158 date "1976-12-01" @default.
- W1619864158 modified "2023-09-27" @default.
- W1619864158 title "OPTIMAL ONE-SECTION AND TWO-SECTION CIRCULAR SOUND-ABSORBING DUCT LINERS FOR PLANE -WAVE AND MONOPOLE SOURCES WITHOUT FLOW" @default.
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