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Hybrid mode-scattering/sound-absorbing segmented liner system and method
Hybrid mode-scattering/sound-absorbing segmented liner system and method
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机译:混合模式散射/吸音分段衬里系统和方法
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摘要
A hybrid mode-scattering/sound-absorbing segmented liner system and method in which an initial sound field within a duct is steered or scattered into higher-order modes in a first mode-scattering segment such that it is more readily and effectively absorbed in a second sound- absorbing segment. The mode-scattering segment is preferably a series of active control components positioned along the annulus of the duct, each of which includes a controller and a resonator into which a piezoelectric transducer generates the steering noise. The sound- absorbing segment is positioned acoustically downstream of the mode- scattering segment, and preferably comprises a honeycomb-backed passive acoustic liner. The invention is particularly adapted for use in turbofan engines, both in the inlet and exhaust.
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