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.