【作者】 姚政成； 刘献栋； 鲍岳； 单颖春； 何田；

【Author】 Yao Zhengcheng;Liu Xiandong;Bao Yue;Shan Yingchun;He Tian;Beijing University of Aeronautics and Astronautics;

【机构】 北京航空航天大学；

【摘要】 声学黑洞作为一种能量汇聚结构,具有操纵弯曲波的特性,将声学黑洞结构作为元胞,所设计的声子晶体能够进一步对结构内的弹性波进行操控,形成带隙。为了进一步拓宽声子晶体结构的带隙,引入了与原材料弹性模量差异较大的第二种"软"材料,并对结构的强度进行了讨论。通过比较几种结构的能带结构与传递特性,验证了加强型声学黑洞结构具有最优的综合性能,并对其结构进行参数化讨论与优化。同时,本文探讨了结构中单元尺寸变化的非周期结构,这种结构兼有宽带隙且高强度的特点。本研究可以为振动噪声控制领域中减振的设计提供指导。更多还原

【Abstract】 Acoustic black holes(ABH) have the property of manipulating bending waves. By using the ABH structure as a primitive cell, the phononic crystals could further manipulate the elastic waves within the structure to form a band gap. In order to further widen the band gap of the phononic crystal structure, a second "soft" material with a large difference in elastic modulus from the raw material was introduced, and the strength of the structure was discussed. By comparing the band structure and transmission characteristics of several structures, the enhanced acoustic black hole structure was verified to have the best comprehensive performance, and parametric discussion and optimization of its structure were carried out. In addition, the aperiodic structures with element size variation were discussed, which had the characteristics of wide band gap and high strength. This study can provide guidance for the design of vibration attenuation in the field of vibration and noise control.更多还原