Abstract Aiming at the problem of low-frequency vibration and noise reduction in the engineering field, a new two-dimensional tapered scatterer phononic crystals slab is designed and the bandgap characteristics and displacement vector field of the model are simulated by means of finite element method. The numerical simulations show that an extremely wide complete bandgap can be achieved at low frequency. Compared with the reference model [Acoust. Phys. 65 (2019) 322], the first complete bandgap of the designed model has a lower starting frequency and a wider bandgap which is expanded by nearly 15 times. Moreover, the mechanism of bandgap generation is analyzed, the influences of geometric parameters and structure symmetry on the band structure are also investigated.

中文翻译：

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二维锥形散射体声子晶体板在低频下的宽带隙特性模拟

摘要 针对工程领域的低频减振降噪问题，设计了一种新型二维锥形散射体声子晶体板，并利用有限元方法对模型的带隙特性和位移矢量场进行了模拟。数值模拟表明，在低频下可以实现极宽的完整带隙。与参考模型[Acoust. 物理。65（2019）322]，设计模型的第一个完整带隙具有较低的起始频率和较宽的带隙，扩展了近15倍。此外，分析了带隙产生的机理，研究了几何参数和结构对称性对带隙结构的影响。