噪声与振动控制2011，Vol.31Issue(1)：141-144,4.DOI:10.3969/j.issn.1006-1355-2011.01.030
孔截面变化对厚微穿孔板吸声性能的影响
The Influence of Variable Section of Orifice on Sound Absorption Characteristics of Thick Microperforated Panel
何立燕 1扈西枝 1陈挺2
作者信息
- 1. 上海飞机设计研究院,结构设计研究部,上海,200232
- 2. 上海航空器适航审定中心,结构强度室,上海,200335
- 折叠
摘要
Abstract
The orifices in thick microperforated panels (MPPs) are normally straight holes with uniform section.Although the increase in thickness extends the MPP' s application, the eventually change of acoustic impedance of MPP will reduce its absorption coefficient. One way to improve this deterioration is to use variable section for the orifices in the thick MPPs. In this paper, 10mm thick MPPs with varying section holes molded by tapering and step-shaped molding cores are prepared by using epoxy resin, and their acoustic characters are measured. Results show that the sound-absorption band of the MPPs with varying-section holes is extended. Compared with conventional MPPs with straight and uniform sectionnal holes, the absorption frequency range extended from 300～700Hz to 310～830Hz, and average absorption coefficient increases from 0.45 to 0.54 for MPPs with conical holes.关键词
声学/台阶孔/锥形孔/厚微穿孔板/吸声性能引用本文复制引用
何立燕,扈西枝,陈挺..孔截面变化对厚微穿孔板吸声性能的影响[J].噪声与振动控制,2011,31(1):141-144,4.
