科研之友
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摘要
We prepare a class of locally resonant (LR) sonic materials. The experiments demonstrate that the resonant frequency decreases with the increasing density of the scattering unit cores or with the reducing elastic constants of the silicone rubber coating. By combining three LR layers of different resonant frequencies and choosing 10 dB as the threshold of relative attenuation, we obtain an ultrawide bandgap (200-950 Hz) sound material with an average transmission loss 22 dB lower than that dictated by mass density law.
- 出版日期2005-12
- 单位中国人民解放军国防科学技术大学
