复式晶格声子晶体的多带隙实验研究  

Experimental study on multi-complete bandgaps of a complex lattice phononic crystal

作　　者：赵寰宇[1] 严珠妹 盖晓玲[2] 刘兵飞[3] ZHAO Huan-yu YAN Zhu-mei GAI Xiao-ling LIU Bing-fei(Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China Beijing Key Laboratory of Environment Noise and Vibration, Beijing Municipal Institute of Labor Protection, Beijing 100054, China Airport College, Civil Aviation University of China, Tianjin, 300300, China)

机构地区：[1]北京交通大学工程力学研究所,北京100044 [2]北京市劳动保护科学研究所环境噪声与振动北京市重点实验室,北京100054 [3]中国民航大学机场学院,天津300300

出　　处：《振动与冲击》2017年第11期129-133,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金(11302021);北京交通大学人才基金(2014RC001);天津市自然科学基金(15JCQNJC42600)

摘　　要：由于人工声子晶体具有天然材料所不具备的异常物理性质,它能够调控弹性波或声波的传输。考虑复式晶格可以降低晶体结构的对称性,容易打开完全带隙,进而抑制波的传播。设计了单胞含6个"原子"的(3.4.6.4)晶格钢/水声子晶体,结合超声浸水透射技术,测试了第一布里渊区Γ-K和Γ-M方向带隙性质。结果表明:实验得到的宽频段8个完全带隙频率范围和有限元法计算值可以很好地吻合。还详细分析了完全带隙边界频率点本征模态和声波局域效应,这对于设计多带隙隔声材料具有重要参考意义。Phononic crystals are man-made materials possessing rich physical properties to tune propagation of elastic waves or acoustic beyond nature material. Since the structures with compound Bravais lattices may reduce its lattice symmetry, it is show that these lattice structures can generate more complete bandgaps, which prohibit transmission of waves. In this paper, A 6-atom unit cell phononic crystal composed of （3.4.6.4） lattice array of circular steel cylinders in water is devised. Based on the ultrasonic immersion transmission technique, the experimental transmission spectra of bandgaps are measured as the acoustic waves propagate through the phononic crystal in the Γ-K and Γ-M directions. The measured experiment results of frequency ranges of eight complete bandgaps are well consistent with the theoretical values using the ？nite element method. Further, the eigenmodes and localized effects of complete bandgaps are analyzed in detail. It is very important to design the controlling noise materials of numerous complete bandgaps in the wider frequency ranges.

关 键 词：声子晶体 复式晶格 多带隙 实验研究 

分 类 号：O347[理学—固体力学] TB533[理学—力学]