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Acoustic Calculation and Experimental Research of Micro-perforated Panel Combined with the Mechanical Impedance
Author(s): WU Nan, FAN Xiangqian, ZHAO Xiaodan
Pages: 480-
484
Year: 2015
Issue:
3
Journal: Piezoelectrics & Acoustooptics
Keyword: micro-perforated panel; mechanical impedance; low-frequency noise; acoustic compliance; air spring;
Abstract: 机械阻抗板(MIP)由刚性薄板与其周围黏贴的阻尼材料组成,利用其机械共振将声能耗散于黏性阻尼,阻抗板与微穿孔板相结合可提高传统微穿孔板(MPP)的低频吸声性能.计算组合结构吸声系数的关键是阻抗板后封闭空腔的处理,对比分析了将空腔等效成声顺,阻抗转移法,传递矩阵法及将空腔等效成空气弹簧的4种处理方法,并进行了相应的试验验证.研究表明,将空腔等效成声顺和空气弹簧实质上是相同的,但当空腔深度较大时,由于忽略声质量,易产生计算误差.阻抗转移法与传递矩阵法实质上是相同的,与试验结果吻合良好,计算准确.
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