1) Capillary sound absorption theory
微穿孔板吸声理论
2) Micro_perforated resonance theory
穿孔板共振吸声理论
3) microperforated panel absorber
微穿孔吸声板
1.
One microperforated panel absorber is presented in this paper,which is used for replacing the old one.
提出一种穿孔吸声板,用于代替原有的吸声板,不仅可以减少材料的厚度,而且可以提高材料的吸声系数加宽吸声频带,以最大限度的提高经济指标,所研究的宽频变腔高阻吸声板经浙江省环保与振动控制专业协会测试,其吸声系数普遍高于普通微穿孔吸声板。
5) perforated acoustic board
穿孔吸声板
6) perforated panel resonance theory
穿孔板共振结构吸声理论
1.
The relationship between tested results of nonwovens backed with cavity and the theory of perforated resonance is also discussed and the conclusion is achieved that the first maximum sound absorption coefficient frequency can be obtained by the perforated panel resonance theory.
应用穿孔板共振结构吸声理论得出与实测非织造布结构第一吸声峰值频率相近的频率值。
补充资料：Bcc微声狙击步枪
bcc 9mm微声狙击步枪结构基本和9mm微声突击步枪相同，只是枪管较长，有一个较大的固定框架式枪托。它也发射９ｍｍ亚音速特种弹。其威力大于９ｍｍ微声突击步枪，能穿透５００ｍ距离上的２ｍｍ厚钢板，穿透后对人仍有足够的停止作用。
结构特点
该枪可分解为枪托、机匣、枪管／消声器组件，装箱携行。枪上配有光学瞄准镜和光电夜视仪
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条