微穿孔板吸声体吸声性能的研究

Sound Absorption Performance on Micro Perforated Sbsorber

穿孔板吸声体的吸声性能主要取决于自身的结构参数,合理的参数组合会取得较高的吸声系数。通过MATLAB数值仿真对其吸声特性进行研究,得到不同参数对吸声性能的影响规律。取典型参数值制作符合国际标准阻抗管尺寸的微穿孔板,其声音频率覆盖范围为100~5 000Hz,并对其进行吸声系数的测试。实验证明理论值与实验值吻合。

The paper introduces the classical theory of MPA （micro perforated absorber）. The sound ab- sorption performance of MPA mainly depends on its structural parameters. Reasonable parameter combination will get a high absorption coefficient. MATLAB numerical simulation was used to study the sound absorption performance. The influence of the different parameters on the sound absorption performance was then discovered. To verify the result of numerical simulation, MPA samples were fabricated using optimized parameters for international standard impedance tube size and the frequency ranges of 100- 5000 Hz. The sound absorption performances of these samples were tested and the experimental result is consistent with that of numerical simulation.