论文标题
双重自由度Helmholtz谐振器的声学衬里
Double Degree of Freedom Helmholtz Resonator Based Acoustic Liners
论文作者
论文摘要
在本文中，进行了一项关于双重自由度Helmholtz谐振器的数值研究，以提高对声音衰减机制的理解的动机进行了动机。单个自由衬里的设计和制造是基线，以与双重自由度的声学衬里进行比较。布里斯托尔的放牧流阻抗设施用于测量声学衬里样品的传输系数，这些系数与通过COMSOL上的数值模拟获得的数据进行了比较。两组数据均显示出很好的共识。通过COMSOL稳态模拟，研究了更改内室尺寸的效果，然后进行时间域模拟。在初级和次级共振峰之间的差异中，最小值。这可能表明在双重自由谐振器中，两个内部空腔的最佳体积比，以吸收宽带的带宽声音。
A numerical and experimental study on double degree of freedom Helmholtz resonator based acoustic liners is performed in this paper, with the motivation to improve the understanding of their sound attenuation mechanism. A single degree of freedom liner is designed and manufactured, as baseline, to compare with the double degree of freedom acoustic liners. The Grazing Flow Impedance Tube Facility at Bristol is used to measure the transmission coefficients of the acoustic liner samples, which are compared against data obtained via numerical simulations on Comsol. Both sets of data show good agreement. The effect of changing the internal chamber dimensions is studied numerically, through Comsol steady state simulations, followed by time domain simulations. A minimum, in the difference between the primary and secondary resonance peaks is observed. This may be an indication of the presence of an optimum volume ratio of the two internal cavities in the double degree of freedom resonator, for a broad bandwidth sound absorption.
