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- W2000669078 abstract "Sound attenuation in a rectangular acoustically lined duct containing uniform mean flow is analytically investigated using the generalized Wiener-Hopf technique. Uniqueness of the solution is enforced for lined sections of the finite axial extent by imposing edge conditions at the liner interface. Possible edge conditions are considered, including the Kutta condition, and the causal solution corresponding to edge conditions is considered the best choice. Solution methods such as the mode matching and singularity methods imply differing edge conditions, and results show that power attenuation is insensitive to the imposed edge conditions, although significant differences are observed for the reflection coefficient. The amplitude of the exponentially increasing instability mode in the lined section must be set to zero as a first approximation to the nonlinear situation, and results indicate that measurements of the reflection factor can be used to make a more definite decision about physically appropriate edge conditions." @default.
- W2000669078 created "2016-06-24" @default.
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- W2000669078 date "1981-08-17" @default.
- W2000669078 modified "2023-09-26" @default.
- W2000669078 title "On eigensolutions for discontinuous liners in a duct containing uniform mean flow" @default.
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- W2000669078 doi "https://doi.org/10.2514/6.1981-2017" @default.
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