Title:
LOW-FREQUENCY COUPLING SOUND ABSORBING STRUCTURE
Document Type and Number:
WIPO Patent Application WO/2020/098477
Kind Code:
A1
Abstract:
A low-frequency coupling sound absorbing structure, comprising a peripheral cavity (1), a resonant cavity (2) provided in the peripheral cavity (1), and an extension pipe structure (3) provided inside the resonant cavity (2). One end of the extension pipe structure (3) is connected to a cavity wall of the resonant cavity (2) by means of a corresponding through hole; the peripheral cavity (1) comprises a micro-perforated plate (11), a back plate (12), a first side plate (13), and a second side plate (14); the micro-perforated plate (11) is provided with a plurality of micro-porous structures (111), the micro-perforated plate (11) is disposed corresponding to the back plate (12), and the first side plate (13) and the second side plate (14) are correspondingly disposed. The low-frequency coupling sound absorbing structure can increase the acoustic impedance of the sound absorbing structure by providing the resonant cavity (2) provided with the extension pipe structure (3) in the peripheral cavity (1) having the micro-porous structures (111), facilitating to increase the sound absorbing coefficient and widen the sound absorbing band, and shift the sound absorbing band to the low frequency, thereby implementing the low-frequency sound absorbing and contributing to the improvement of the product performance.
Inventors:
LI DENGKE (CN)
JIANG ZHONGCHENG (CN)
YE BIAO (CN)
LIU XIAOBO (CN)
WANG XIANFENG (CN)
JIANG JIXIONG (CN)
GUO BINGBIN (CN)
JIANG DAFA (CN)
LI WANG (CN)
CHEN JINGJING (CN)
YUAN WENHUI (CN)
DUAN HUADONG (CN)
ZHOU LI (CN)
ZHANG JUN (CN)
ZHANG BO (CN)
CHEN SHIWEN (CN)
LIU GUOYUN (CN)
SHI ZHU (CN)
JIANG ZHONGCHENG (CN)
YE BIAO (CN)
LIU XIAOBO (CN)
WANG XIANFENG (CN)
JIANG JIXIONG (CN)
GUO BINGBIN (CN)
JIANG DAFA (CN)
LI WANG (CN)
CHEN JINGJING (CN)
YUAN WENHUI (CN)
DUAN HUADONG (CN)
ZHOU LI (CN)
ZHANG JUN (CN)
ZHANG BO (CN)
CHEN SHIWEN (CN)
LIU GUOYUN (CN)
SHI ZHU (CN)
Application Number:
PCT/CN2019/113918
Publication Date:
May 22, 2020
Filing Date:
October 29, 2019
Export Citation:
Assignee:
CRRC ZHUZHOU LOCOMOTIVE CO LTD (CN)
International Classes:
G10K11/162; G10K11/172
Foreign References:
| CN109147750A | 2019-01-04 | |||
| CN107437411A | 2017-12-05 | |||
| US20150090526A1 | 2015-04-02 | |||
| US6069840A | 2000-05-30 | |||
| CN108399911A | 2018-08-14 | |||
| JP2008233793A | 2008-10-02 | |||
| CN201811359437A | 2018-11-15 |
Other References:
See also references of EP 3706114A4
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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