复合微穿孔板吸声结构声学性能预测  

Prediction of Acoustic Properties of Sound-absorbing Structures with Composite Micro-perforated Panels

作　　者：吴佳康 柳政卿 王秋成 WU Jiakang;LIU Zhengqing;WANG Qiucheng(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学机械工程学院,杭州310023

出　　处：《噪声与振动控制》2022年第3期203-208,共6页Noise and Vibration Control

基　　金：浙江省自然科学基金资助项目(LQ20E050022)。

摘　　要：将微穿孔板吸声结构与多孔材料复合,以期得到中低频吸声性能较好的复合层声学结构。以微穿孔板多边形穿孔截面、穿孔率、空腔厚度和多孔材料类型为变量,设计复合层声学结构,给出复合层声学结构吸声系数的理论计算方法和声学有限元仿真预测模型。利用3D打印技术制备精度较高的微穿孔板实验样本,用阻抗管法对复合层声学结构的吸声系数进行实验室测量。对比预测结果和实验数据,发现两者具备很好的一致性。研究表明:复合层声学结构具有很好的中低频吸声系数,通过调整微穿孔板穿孔截面形状和穿孔率可以对中低频段(50 Hz~1600 Hz)噪声进行有效控制。This paper investigates the acoustic properties of a multilayered sound-absorbing structure whose front layer is a micro-perforated panel,followed by a porous sound-absorbing material and backed by an air layer.The micro-perforated panel is designed based on polygon perforation with perforation ratio,depth of the air layer and types of the porous material as variables.The SAC(sound absorption coefficient)of the acoustic structure are theoretically calculated by using the TMM(Transfer Matrix Method),and an acoustic FE(Finite Element)model is developed to predict the SAC of the acoustic structure.The micro-perforated panel with polygon holes is printed by 3D printer in order to obtain high precision test specimens.The sound absorption coefficients of the acoustic structures are measured by means of an impedance tube test.It is found that the measured SAC agrees very well with the prediction model.The results show that the proposed acoustic structure has a good sound absorption coefficient in the low and mid frequency range(50 Hz-1600 Hz),and the noises in this frequency range can be effectively controlled by adjusting the polygon shape of the holes and the perforation ratio of the micro-perforated panel.

关 键 词：声学 多孔材料 微穿孔板 吸声系数 阻抗管法 

分 类 号：TU112.22[建筑科学—建筑理论] TU112.5