Aurégan Yves, Farooqui Maaz
Laboratoire d'Acoustique de l'Université du Mans, Centre National de la Recherche Scientifique (CNRS), Le Mans Université, Avenue Olivier Messiaen, 72085, Le Mans, Cedex 9, France.
Sci Rep. 2019 Jul 31;9(1):11140. doi: 10.1038/s41598-019-47516-7.
The acoustic effects of in-parallel resonators is compared to the behavior of a classical single degree of freedom resonator for which the resistance and the mass are in series. In-parallel resonators serve to enhance the acoustic absorption for mid-frequencies thereby extending the active frequency range of perfect acoustic absorbers. Two implementations of these in-parallel absorbers are presented and investigated experimentally as well as numerically. In the first demonstration, the resistance is a perforated plate with a wiremesh and the oscillating mass is the air that fills a tube passing through the plate. The second implementation consists of a thin flexible beam that oscillates and where the resistance is due to the micro-slit resulting from the cutting of the beam.
将并联谐振器的声学效应与经典单自由度谐振器的行为进行了比较，在经典单自由度谐振器中，电阻和质量是串联的。并联谐振器用于增强中频的吸声效果，从而扩展完美吸声器的有效频率范围。介绍了两种并联吸声器的实现方式，并进行了实验和数值研究。在第一个演示中，电阻是带有金属丝网的穿孔板，振荡质量是填充穿过该板的管子的空气。第二个实现方式由一个振荡的薄柔性梁组成，其电阻是由于梁切割产生的微狭缝造成的。
