In the field of aeronautics and astronautics, it is not convenient to directly arrange the conventional uniform distribution micro perforated panels on the structural parts in the noise reduction design of some structural components.However, there is few study on the sound absorption mechanism of unconventional arrangement micro perforated panels.Therefore, a segmented end correction method based on Fok function was proposed to analyse the unconventional micropore arrangement of annular micro perforated panels.The velocity distribution of the air particles near the micropore was analyzed by means of simulation.On this basis, the end correction was improved.A sample was made and tested in an impedance tube system, and the results were compared with those of the theoretical calculation.It is shown both are in good agreement.Moreover, both the experimental and theoretical results demonstrate that the trend of the absorption peak frequency of the unconventional micro perforated panel with annular arrangement is the same as that of the conventional.Based on the theory of segmented end modification, the method can be used not only in the structural design of unconventional micro perforated panels, but also in the back analysis of irregular micro perforated panels by measuring the sound absorption performance of the structure.
［1］KIM B S, KWON S, JEONG S, et al.Semi-active control of smart porous structure for sound absorption enhancement［J］.Journal of Intelligent Material Systems and Structures, 2019, 30(17): 2575-2580.
［2］ALLAM S.Optimal design of compact multi-partition MPP silencers for IC engines noise control［J］.Noise Control Engineering Journal, 2016, 64(5):615-626.
［3］赵晓丹, 李晓, 丁瑞.机械阻抗与声阻抗结合提高微穿孔板低频吸声性能［J］.声学学报, 2014,39(3):360-364.
ZHAO Xiaodan, LI Xiao, DING Rui.Mechanical impedance combined with acoustic impedance to improve the low frequency sound absorption performance of micro perforated panel［J］.Acta Acustica, 2014,39(3):360-364.
［4］TANG X, YAN X.Acoustic energy absorption properties of fibrous materials: a review［J］.Composites Part A: Applied Science and Manufacturing, 2017, 101: 360-380.
［5］ 刘耀光, 王晓林.黏弹性泡沫多孔材料骨架特征参数对材料吸声性能的影响［J］.振动与冲击, 2016, 35(20):137-141.
LIU Yaoguang, WANG Xiaolin.Influence of skeleton parameters on viscoelastic properties of viscoelastic porous cellular materials［J］.Journal of Vibration and Shock, 2016, 35(20):137-141.
［6］马大猷.微穿孔板吸声结构的理论和设计［J］.中国科学, 1975(1): 38-50.
MA Dayou.Theory and design of sound absorption structure of microperforated panel［J］.Scientia Sinica,1975(1):38-50.
［7］JIANG C S, LI X H, CHENG W Y, et al.Acoustic impedance of microperforated plates with stepwise apertures［J］.Applied Acoustics, 2020, 157:106998.
［8］XIE S C, WANG D, FENG Z J, et al.Sound absorption performance of microperforated honeycomb metasurface panels with a combination of multiple orifice diameters［J］.Applied Acoustics, 2020, 158:107046.
［9］盖晓玲, 李贤徽, 邢拓, 等.L型分割背腔的微穿孔板吸声结构的吸声性能研究［J］.振动与冲击, 2018, 37(16): 256-260.
GAI Xiaoling, LI Xianhui, XING Tuo, et al.Study on the sound absorption performance of micro perforated panel with L-shaped segmented cavity［J］.Journal of Vibration and Shock, 2018, 37(16): 256-260.
［10］刘崇锐, 吴九汇.微穿孔黏性超表面的低频宽带吸声机理［J］.西安交通大学学报, 2019(12): 1-7.
LI Chongrui, WU Jiuhui.Low frequency broadband sound absorption mechanism of micro perforated viscous super surface［J］.Journal of Xi’an Jiaotong University, 2019(12): 1-7.
［11］WANG J G, RUBINI P, QIN Q, et al.A model to predict acoustic resonant frequencies of distributed helmholtz resonators on gas turbine engines［J］.Applied Sciences, 2019, 9(7):1419.
［12］盖晓玲, 李贤徽, 张斌, 等.微孔分布范围对穿孔板吸声性能的影响［J］.压电与声光, 2016, 38(5):795-798.
GAI Xiaoling, LI Xianhui, ZHANG Bin, et al.Influence of micropore distribution on sound absorption performance of perforated plate［J］.Piezoelectrics & Acoustooptics, 2016, 38(5):795-798.
