s structure parameters of the lining. Aiming at the problemРРof aerodynamic noiso in the low speed cavity , this paper makes a muli -parametee mio design of the sound linee РРihaough ihepacnacpleoomcaaopeaooaaied plaiesound absoabea, and addsciioiheaaeciy.Thespeaiaalahaaaaieacs9 РOcs of cavity noiso before and after the installation with acoustic linee were compared, and the noiso reduction 61x0 Рof the sound linee I the cavity noiso problm was eveluated. The inluenco of adding acoustic linee to the noiso of Рthe self-9xcited oscillation cavity and the effect of the acoustic resonance were analyzed.РKeywords : cavity noiso; acoustic Linee microperforated plate sound absorbeo; hxlmholtr resonatOTРР Corresponding author. E-mail: lpq@ buaa. edu. cnРР50
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