公开(公告)号：US20030006089A1

公开(公告)日：2003-01-09

申请号：US10167459

申请日：2002-06-13

申请人： National Aerospace Laboratory of Japan

发明人： Tatsuya Ishii

IPC分类号： B64F001/26 ,  G10K011/00 ,  E04H017/00

CPC分类号： B64D29/00 ,  B64D2033/0206 ,  G10K11/178 ,  G10K2210/109 ,  G10K2210/121 ,  G10K2210/1281 ,  G10K2210/32121

摘要： The fine jet control type sound absorption system of this invention, aimed at absorbing low-frequency sound with both discrete frequency and broadband frequency to the same degree as already existing acoustic lining can do, is composed of two parts. One is a barrier wall covering an air space in which the concerning low-frequency sound propagates and having a multiplicity of small holes formed therein. The other is the means for causing a fine jet passing through these small holes into or out from the air space. This sound absorption system realizes a fine jet in the vicinity of the barrier wall for the purpose of canceling the sound inside the air space by means of the interference of the sound with the fine jets. Any of or a combination of shape of small holes, jet ejection angle or suction angle, amount of jet flow, thickness of a barrier wall back layer and air flow angle at which secondary air flows into the barrier wall back layer is selected.

摘要翻译： 本发明的精细喷射控制型吸音系统由两部分组成，其目的是吸收具有离散频率和宽带频率的低频声音至与已有声学衬里相同的程度。 一个是覆盖有关低频声音传播并且形成有多个小孔的空气空间的阻挡壁。 另一种是使细小喷嘴穿过这些小洞进入或离开空气的装置。 这种吸音系统在隔壁附近实现了细小的喷射，以便通过声音与细小射流的干扰来消除空气中的声音。 选择小孔的形状，喷射喷射角度或吸入角度，射流量，阻挡壁背层的厚度和二次空气流入阻挡壁背层中的空气流动角度的任何形式或组合。