一种新型声学超材料平板对机械波吸收性能的模拟与实验研究  

Simulation and experimental study of a metamaterial panel for mechanical wave absorption

作　　者：孙宏伟[1] 林国昌[1] 杜星文[1] P.F.Pai 

机构地区：[1]哈尔滨工业大学特种环境复合材料技术国防科技重点实验室 [2]Department of Mechanical and Aerospace Engineering,University of Missouri,Columbia,MO 65211,USA

出　　处：《物理学报》2012年第15期310-316,共7页Acta Physica Sinica

基　　金：中央高校基本科研业务费专项资金(批准号:HIT.KLOF.2010027)资助的课题~~

摘　　要：基于质量-弹簧微结构通过光学振动模式对机械波进行选择性吸收的原理,本文设计了一个由集中质量与弹性薄膜构成的二维声学超材料等效平板结构.利用有限元法对等效平板代表性胞元的振动特性模拟结果表明,二维超材料平板结构表现出与质量-弹簧微结构相同的振动模式.基于模拟结果,制作加工了一个正方形超材料平板,并通过P01ytec扫描式激光测振仪(PSV)对其振动特性进行了试验测试,结果表明,本文设计制作的超材料平板可以对频率157.5 Hz的机械波进行选择吸收.Based on the mechanical wave selective absorption principle of mass-spring microstructures by the optical vibration mode,a two-dimensional acoustic metamaterial panel consisting of lumped mass and elastic membrane is presented.The vibration characteristic simulation of the metamaterial equivalent panel representative cell is performed using the finite element method and the results indicate that the presented 2D metamaterial panel behaves just like regular mass-spring microstructures.Under the guidance of the simulation results,a square metamaterial panel is fabricated and its vibration characteristics are examined using a Polytec scanning laser vibrometer.The test results indicate that the metamaterial panel can efficiently absorb mechanical waves of about 157.5 Hz.

关 键 词：质量-弹簧微结构 光学振动模式 机械波 声学超材料等效平板 

分 类 号：TB34[一般工业技术—材料科学与工程]