具有并联不等深度子背腔序列的微穿孔板吸声体吸声特性

发布时间：2018-05-14 22:27

本文选题：微穿孔板 + 吸声体　；参考：《东南大学学报(自然科学版)》2017年01期

【摘要】：详细讨论了一种新型宽频带微穿孔板(MPP)吸声体的吸声特性,该吸声体由单层MPP和基于二次余数扩散体(QRD)深度序列设计的多个并联且深度不等的子背腔组成.首先,从理论上提出了该吸声体正入射吸声系数的解析计算方法;然后,建立了有限元数值仿真模型验证所提出的解析计算方法,并分析该吸声体的正入射吸声特性;最后,在矩形驻波管内基于传递函数法实验测量了该吸声体样品的正入射吸声系数.实验结果表明,所提出的该类吸声体正入射吸声系数的解析计算方法准确可靠.同时,在460~3 500 Hz的频率范围内,采用解析计算方法预测的该类MPP吸声体的正入射吸声系数不小于0.5,最大吸声系数能达到0.98.
[Abstract]:The sound absorption characteristics of a new type of wide band micro perforated plate (MPP) sound absorption body are discussed in detail. The sound absorption body is composed of a single layer of MPP and a depth sequence based on the two remainder diffuser (QRD) depth sequence. First, an analytical calculation method for the sound absorption coefficient of the sound absorption body is proposed in theory. The analytical calculation method of the finite element numerical simulation model is established and the positive incidence of sound absorption of the sound absorption body is analyzed. Finally, the positive incidence of sound absorption coefficient of the sound absorption body sample is measured experimentally in a rectangular standing wave tube based on the transfer function method. The experimental results show that the positive incidence of sound absorption coefficient of this kind of sound absorption body is analyzed. The calculation method is accurate and reliable. At the same time, the positive incidence sound absorption coefficient of this kind of MPP sound absorption body is not less than 0.5, and the maximum sound absorption coefficient can reach 0.98. within the frequency range of 460~3 500 Hz.

【作者单位】：东南大学建筑学院;东南大学城市与建筑遗产保护教育部重点实验室;
【基金】：国家自然科学基金资助项目(51408113) 江苏省科技计划青年基金资助项目(BK20140623)
【分类号】：TU552

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