并联双振子声子晶体梁结构带隙特性研究  

Study of the bandgap characteristics of a locally resonant phonoic crystal beam with attached double oscillators in parallel

作　　者：吴旭东[1] 左曙光[1] 倪天心[1] 范珈璐 

机构地区：[1]同济大学新能源汽车工程中心,上海201804 [2]中国航天科工集团八五一一研究所,江苏南京210007

出　　处：《振动工程学报》2017年第1期79-85,共7页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51305303);同济大学青年英才计划(2014KJ069)

摘　　要：为使声子晶体结构实现范围更宽的多带隙特性,基于单振子型声子晶体结构弯曲振动带隙频率范围窄的局限,提出了一种双侧振子布置形式的局域共振声子晶体梁结构,并基于传递矩阵法和有限元法对其进行了无限周期和有限周期的带隙计算,分析了双带隙配合减振的特性;试制了声子晶体梁样件并进行传递特性试验,通过仿真计算与试验结果的对比,验证了有限元法对有限周期结构带隙预测的准确性和有效性;最后基于有限元方法探讨了周期数和晶格常数对双振子梁带隙特性的影响。为并联式双振子声子晶体结构的工程应用提供了理论依据和工程参考。In order to enlarge the frequency range of multi-bandgaps of the locally resonant phononic crystal （LRPC） structure, a locally resonant （LR） beam with periodically double-sided parallelly attached multi-oscillators is proposed to overcome the limitation of narrow bandgap of the single oscillator configuration. The flexural vibration transmission characteristics of the proposed configuration of infinite and finite structures are obtained respectively by transfer matrix （TM） method and finite element method （FEM）. The vibration control of the double bandgaps is discussed. The FE modeling and simulation are verified by a sample test and the influence of period number and lattice constant to the bandgap is analyzed with FE simulation. The study shows the theoretical mechanism and indicate the engineering potential of the LR beam with parallel attached multi-oscillator configuration.

关 键 词：声子晶体 弯曲振动 带隙 并联双振子 

分 类 号：O328[理学—一般力学与力学基础] TB535[理学—力学]