公开(公告)号：US20230215411A1

公开(公告)日：2023-07-06

申请号：US17792026

申请日：2021-08-31

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Yulin MEI ,  Xiaoming WANG ,  Yuanxiu WANG

IPC: G10K11/162 ,  G10K11/20

CPC classification number: G10K11/162 ,  G10K11/20

Abstract: The type of acoustic absorber comprises a micro-perforated plate, a cavity behind the micro-perforated plate, a slender and curved main acoustic propagation passage communicating with the cavity, and a set of acoustic filters arranged along the main acoustic propagation passage. These acoustic filters have different cut-off frequencies and are arranged in the order of the cutoff frequencies from high to low from the open end to the closed end of the main acoustic propagation passage. The acoustic filter comprises a section of the main acoustic propagation passage and at least one cavity communicating with the main acoustic propagation passage. The type of acoustic absorber is characterized by adopting a main acoustic propagation passage to provide different phase delay for a micro-perforated plate to realize that a micro-perforated plate effectively absorbs broadband acoustic waves, and by combing the close arrangement of main acoustic propagation passage to achieve the ultra-thin structure.

公开(公告)号：US20180310092A1

公开(公告)日：2018-10-25

申请号：US15771922

申请日：2016-07-18

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Yulin MEI ,  Xiaoming WANG ,  Yixuan MEI ,  Yuanxiu WANG

IPC: H04R1/28 ,  H04R1/44 ,  G10K11/02

CPC classification number: H04R1/2876 ,  G10K11/02 ,  H04R1/2873

Abstract: The present invention discloses a ultrathin acoustic impedance converter belonging to the acoustic field, which is characterized by comprising one or a plurality of impedance conversion units, wherein each impedance conversion unit is composed of a frame, a plurality of prestressed membranes or prestressed string nets, and multiple layers of acoustic material, wherein a permeable cavity is arranged in the frame, the prestressed membranes or string nets and the acoustic material are alternately arranged in the cavity, i.e., a prestressed membrane or string net is arranged, and then a layer of acoustic material is arranged, and so on until the cavity is fully filled. The cavity can be designed in different shapes, including a variable cross section and a uniform cross section. Each prestressed membrane or string net is required to be applied with prestress before being arranged in the cavity, and the magnitude of the prestress depends on the resistance value that the membrane or string net is expected to reach. The novel ultrathin acoustic impedance converter of the present invention can realize rapid change from low impedance to high impedance or from high impedance to low impedance and realize ultrathin design.