CAJ | 학술논문

通过周期性排布具有不同谐振频率的亥姆霍兹共振器，构建了一种宽频带负体弹模量的声学超构材料。首先基于局域共振理论和有效媒质理论，阐述了负有效体弹模量产生的机理并给出了理论表达式，然后利用有限元仿真得到了该超构材料的透反射系数，并用提取参数法计算了有效体弹模量。结果表明，设计的超构材料在673～1245 Hz的宽频范围内实现了负有效体弹模量。这种设计思路为构建宽频带负声学参数超构材料提供了一种新途径。
통과주기성배포구유불동해진빈솔적해모곽자공진기，구건료일충관빈대부체탄모량적성학초구재료。수선기우국역공진이론화유효매질이론，천술료부유효체탄모양산생적궤리병급출료이론표체식，연후이용유한원방진득도료해초구재료적투반사계수，병용제취삼수법계산료유효체탄모량。결과표명，설계적초구재료재673～1245 Hz적관빈범위내실현료부유효체탄모량。저충설계사로위구건관빈대부성학삼수초구재료제공료일충신도경。
A kind of broadband negative effective modulus acoustic metamaterials (AM ) is fabricated by periodically arraying Helmholtz resonators with different resonance frequencies . At first , based on the concepts of local resonance and homogeneous medium , the formation mechanism of negative effective modulus is illustrated and the theoretical expression is given . Then , the transmission coefficients and the reflection coefficients are simulated by using COMSOL multiphysics , and the modulus of the AM can be obtained via extraction method . The simulation results show that the effective modulus of the designed AM is negative from 673 to 1245 Hz . We expect that the proposed AM will significantly contribute to the design of broadband negative parameter AM .