Study on Acoustic Characteristic of Micro-Perforated Panel with Variable Cross-Section
Study on Acoustic Characteristic of Micro-Perforated Panel with Variable Cross-Section
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发表时间：
2009
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通讯作者：
Li Xiao-kuan
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作者：
Li Xiao-kuan
传统的微穿孔板（MPP）需要在很薄的板上开很小的孔才能获得较好的吸声性能，在孔率一定的情况下，板厚的增加会使吸声性能变差。为了避免这一问题，提出了一种新的微穿孔板结构。与传统的微穿孔板不同，这种MPP的孔截面沿孔轴方向在沿着某些地方发生突变，本文根据Ma的理论，对这种MPP的吸声性能进行了评估，并将计算结果与阻抗管的实验数据进行了比较，发现这种MPP的吸声性能优于普通MPP。这种板的吸声性能主要取决于小孔的位置，而大孔的位置仅用于增加板的厚度，这种方法可以使板的厚度增加时，板的吸声性能保持在较好的水平。
Traditional Micro-Perforated Panel(MPP) requires small diameter of holes over a very thin panel to obtain better property of sound absorption.In the case of constant hole rate,property of the sound absorption will become worse when panel thickness is increased.To avoid this problem,a new structure of MPP is provided.Different from the traditional MPP,cross-sections of holes of this MPP change suddenly in some places along the axes of the holes.In this paper,based on Ma's theory,an assessment of sound absorption properties of this kind of MPP is presented.Computation results and experimental data of an impedance tube are compared each other.It is found that the performance of absorption of this kind of MPP depends mainly on the portions of the small holes,and the portions of large holes are for increasing the thickness of the plate only.With this method,the sound absorption of the MPP can be kept in a better level when the thickness of the panel is increased.