复式(4.8~2)晶格声子晶体的低频完全带隙实验研究  

Experimental Demonstration of Low-frequency Complete Bandgaps in Phononic Crystal With (4.8~2) Lattice

作　　者：赵寰宇[1] 高晓霞 刘飞[2] 李凤莲[3] ZHAO Huanyu1, GAO Xiaoxia1, LIU Fei2, LI Fenglian3(1. Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China;2. College of Mechanical and Electrical Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;3. Mechanical Electrical Engineering School, Beijing Information Science ＆ Technology University, Beijing 100192, Chin)

机构地区：[1]北京交通大学工程力学研究所,北京100044 [2]内蒙古农业大学机电工程学院,呼和浩特010018 [3]北京信息科技大学机电工程学院,北京100192

出　　处：《北京工业大学学报》2018年第5期777-782,共6页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(11302021;11662013);中央高校基本科研业务费重大预研资金资助项目(2016JBZ010);北京市教育委员会科技计划资助项目(KM201711232002)

摘　　要：为了设计新型低频降噪材料,基于复式晶格可以降低晶体结对称性与打开低频带隙的特征,以单胞含4个"原子"的复式(4.8~2)晶格钢/水声子晶体为研究对象,通过实验测试了第一布里渊区ΓX和ΓM方向带隙的性质,并进一步分析了完全带隙边界点的本征模态特点,阐述了其声波能量分布规律.实验结果表明:低频的2个完全带隙频率范围与有限元法计算值较为一致.To design the novel forbidden-noise material,the compound lattice may reduce the structure symmetry and open the low-frequency bandgaps,a phononic crystal composed of（ 4. 8^2） lattice array of circular steel rods in water was investigated and has four ＂atoms ＂per unit cell. The experimental transmission spectra of directed bandgaps were tested as the acoustic waves propagate through the phononic crystal along the ΓX and ΓM directions. Further,the eigenmodes of complete bandgap edges and acoustic wave energy were discussed comprehensively. Results of complete bandgaps agree well with the theoretical values by the flnite element method.

关 键 词：声子晶体 (4.8^2)晶格 带隙 有限元法 

分 类 号：O347[理学—固体力学] TB533[理学—力学]