南京大学学报（自然科学版）2017，Vol.53Issue(4)：681-685,5.DOI:10.13232/j.cnki.jnju.2017.04.009
有限大背腔单层微穿孔板吸声体吸声特性研究
Investigation on the absorption characteristics of single-layermicro-perforated panel absorber with finite-sized cavity
摘要
Abstract
In this paper,the absorption characteristics of a single-layer micro-perforated panel(MPP)absorber with finite-sized cavity are investigated according to the finite element method.Firstly,the numerical model of this kind of single-layer MPP absorber is established,and the accuracy of it is validated through the equivalent circuit method.Secondly,based on the validated finite element model,the sound absorption characteristics of the single-layer MPP absorber are discussed under oblique incidence conditions,and the influences of width-depth ratios of the finite-sized cavity on the diffuse field sound absorption coefficients of the absorber are also investigated.The results show that for a normal incidence condition,the sound absorption performances of the single-layer MPP absorber are mainly influenced by the non-grazing modes of the finite-sized cavity,while for a grazing incidence condition,are mainly influenced by the grazing modes;in addition,the different grazing modes of the finite-sized cavity can be excited by the sound with different incidence angles,thus the absorption performance of the single-layer MPP absorber can be further enhanced;furthermore,the peak locations of the sound absorption coefficient of the single-layer MPP absorber at high frequencies can be effective controlled through tuning the width-depth ratio of the finite-sized cavity,and there is an optimum ratio that can makes the single-layer MPP absorber both have higher sound absorption coefficient and wider sound absorption bandwidth.This paper is supposed to provide some useful suggestions to noise engineering control and indoor acoustical design.关键词
微穿孔板/数值仿真/斜入射/宽深比Key words
micro-perforated panel/numerical simulation/oblique incidence/width-depth ratio分类
建筑与水利引用本文复制引用
郭文成,闵鹤群..有限大背腔单层微穿孔板吸声体吸声特性研究[J].南京大学学报（自然科学版）,2017,53(4):681-685,5.基金项目
国家自然科学基金(51408113),江苏省科技计划青年基金(BK20140623) （51408113）
