摘要
基于局域共振带隙机理,设计一种新型的轮辐式三组元凸起声子晶体板隔振器,并结合理论带隙计算、有限元仿真和试验测试对隔振器的低频隔振特性进行分析和验证。研究发现,以轮辐形板为三组元凸起声子晶体板的基板比圆形板容易获得更大的带隙频率范围内衰减幅度。基板上开孔可以提高带隙的终止频率,从而增大带隙宽度。选用三种双侧凸起的原胞为轮辐板的基本单元,设计了三种单轮辐板隔振器,以及不同轮辐板排列组合的六种双轮辐板和六种三轮辐板隔振器。实测数据表明,单轮辐板、双轮辐板以及三轮辐板隔振器在其带隙频率范围内平均衰减幅度分别可以达到24 dB、34 dB以及38 dB。这种结构设计及研究结果在低频减振领域有潜在的应用前景。
Spoke-like vibration isolators composed of three-component photonic crystal plates were designed based on the locally resonant mechanism of vibration band gaps. The low-frequency vibration isolation characteristics of the designed isolators were investigated through vibration band gap calculation,finite element simulation and tests. The results showed that compared with a round base plate,a spoke-like base plate is more effective to obtain vibration amplitude attenuation in the frequency band gap range; periodic holes on the base plate of a spoke-like pillared photonic crystal plate can enlarge the band gap width by raising the cutoff frequency of the frequency band gap. Three bilateral cells were taken as basic units of double-side pillared plates,three isolators with one spoke-like plate,six isolators with two spoke-like plates and six isolators with three spoke-like plates were designed. Test results showed that the average vibration amplitude attenuations of the designed spoke-like vibration isolators with one,two and three spoke-like double-side pillared photonic crystal plates( DSPPCPs) can reach 24 dB,34 dB and 38 dB,respectively; these structural designs and investigation results have a potential application prospect in the field of low-frequency vibration reduction.
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第15期43-50,共8页
Journal of Vibration and Shock
基金
基金项目:"111"工程( B07018)
关键词
声子晶体
局域共振
隔振器
低频带隙
photonic crystal
local resonance
vibration isolator
low-frequency band gap
