A design method of micro-perforated panel absorber at high sound pressure environment in launcher fairings
A design method of micro-perforated panel absorber at high sound pressure environment in launcher fairings
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DOI：
10.1016/j.jsv.2012.09.015
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发表时间：
2013-02
影响因子：
4.7
通讯作者：
Soon-Hong Park
中科院分区：
文献类型：
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作者：
Soon-Hong Park
针对运载火箭有效载荷整流罩内部的吸声问题，提出了一种微穿孔板吸声器的设计方法。为此，本文提出了一种高声压环境下微穿孔板吸声体的经验声阻模型。该阻力模型特别适合于发射装置整流罩的应用，因此，光罩表面的入射压力被认为是一个主要变量。其他设计变量，例如，模型中还考虑了微孔直径、穿孔率和板厚等因素。通过与具有实际参数范围的几种微穿孔板吸声体的测量结果进行比较，验证了所估计的声阻和相应的吸声系数。当开孔率在1.4%~ 5.3%范围内时，计算结果与实测结果吻合较好。讨论了设计参数对吸声系数的影响。结果表明，在低声压级下吸声性能较差的大孔径（约1.0mm）微穿孔板吸声体在高入射声压级下具有良好的吸声性能。提供了一组设计图表，这使得人们能够很容易地设计一个微穿孔板吸收器，用于减轻发射器整流罩中的声载荷。
A design method of micro-perforated panel absorbers is proposed for the enhancement of acoustic absorption inside the payload fairings of launch vehicles. An empirical acoustic resistance model of a micro-perforated panel absorber in a high sound pressure environment is suggested to this end. The resistance model is especially appropriate for the launcher fairing application, so that the incident pressure to the surface of bare fairings is considered as a main variable. Other design variables, e.g., the minute hole diameter, the perforation ratio and the thickness of the panel, are also considered in the proposed model. The estimated acoustic resistances and corresponding absorption coefficients are verified by comparing them with the measured results for several micro-perforated panel absorbers having a practical range of parameters. The estimated and measured results show good agreement when the perforation ratio is in the range of 1.4% to 5.3%. The effects of design parameters on the absorption coefficient are discussed. It is demonstrated that the micro-perforated panel absorber with a large hole diameter (about 1.0mm), which shows a poor sound absorption at low pressure levels, can be a good sound absorber at high incident pressure levels. A set of design charts is provided and this enables one to readily design a micro-perforated panel absorber for the mitigation of acoustic loads in launcher fairings.