The composite sound-absorbing device of the present invention includes a perforated board having a number of first pores thereon, a back board and side boards, the perforated board, back board and side boards forming a closed cavity, wherein: at least one or more of the resonant cavities being located within the closed cavity; at least one or more of second pores being located on the resonant cavities; at least one of the second pores being connected with the closed cavity; the resonant cavity having a volume of V=10 mm3 −1×1010 mm3, having a thickness of 0.05 mm-10 mm, the second pores having an aperture of d′=0.05-100 mm, with a perforation rate σ′=0.01%-30%. The present invention is beneficial to improve the effect of sound-absorbing and expand the frequency band of sound-absorbing.
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机译：本发明的复合吸声装置包括：在其上具有多个第一孔的穿孔板，背板和侧板，该穿孔板，背板和侧板形成封闭的空腔，其中：至少一个或多个谐振腔位于封闭腔内;至少一个或多个第二孔位于谐振腔上;第二孔中的至少一个与封闭腔连接;体积为V = 10 mm 3 −1×10 10 mm 3 的谐振腔，厚度为0.05 mm-10 mm ，第二孔的孔径为d'= 0.05-100mm，穿孔率σ'= 0.01％-30％。本发明有利于提高吸声效果，扩大吸声频段。
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