基于双层反对称阻尼式声子晶体的双通路宽频带噪声抑制方法研究  

Dual-channel broadband noise suppression method based ondouble-layer anti-symmetric damping phononic crystals

作　　者：白晓天 肖照洋 石怀涛[1] 罗忠 赵金宝[1] 何凤霞 BAI Xiaotian;XIAO Zhaoyang;SHI Huaitao;LUO Zhong;ZHAO Jinbao;HE Fengxia(School of Mechanical Engineering,Shenyang Jianzhu University,Shenyang 110168,China;MOE Key Lab for Vibration and Control of Aero-Propulsion System,Northeastern University,Shenyang 110819,China)

机构地区：[1]沈阳建筑大学机械工程学院,沈阳110168 [2]东北大学航空动力装备振动及控制教育部重点实验室,沈阳110819

出　　处：《振动与冲击》2024年第11期155-164,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金(52275119;52075348);东北大学航空动力装备振动及控制教育部重点实验室研究基金(VCAME202203);辽宁省教育厅基金(LJKZZ20220078)。

摘　　要：针对现有声子晶体模型难以在结构传播与空气传播双通路实现噪声抑制的问题,提出了一种双层反对称阻尼式声子晶体结构,以双层阻尼式声子晶体为单元抑制噪声结构传播,将迷宫型散射体反对称式排列抑制噪声空气传播,实现双通路宽频带降噪。研究基于有限元理论与力声类比法对模型的能带图、传递曲线与吸声系数进行计算,对比分析了吸声性能与传统结构的差异,并通过试验进行验证。研究发现,模型中的双层阻尼—散射体结构可将降噪带宽拓展为传统结构的3.3倍,且同体积附加质量仅为传统结构的53.3%,反对称结构可突破吸声系数瓶颈,实现高效吸声。结果表明该模型可以实现双通道宽频带范围内的噪声控制,并具有轻质化的特点,能很好地补足现有声子晶体模型在宽频带噪声控制领域的短板。Here,aiming at the problem of existing phononic crystal models being difficult to realize noise suppression in both structural and air propagation paths,a double-layer anti-symmetric damping phononic crystal structure was proposed.The double-layer damping phononic crystal was taken as a unit to suppress noise propagation in structure,and maze shaped scatterers were arranged in an anti-symmetric manner to suppress noise propagation in air to realize dual-channel wideband noise reduction.The study was based on the finite element(FE)method and the force-sound analogy method to calculate energy band diagram,transmission curve and sound absorption coefficient of the model,and contrastively analyze differences in sound absorption performance between the model and traditional structures.The proposed model’s verification was performed through experiments.The study showed that the double-layer damping scatterer structure in the model can expand the noise reduction bandwidth to 3.3 times that of traditional structure,and the added mass of the same volume is only 53.3%of traditional structure’s;anti-symmetric structure can break through the bottleneck of sound absorption coefficient to realize highly efficient sound absorption;the proposed model can realize noise control within a dual-channel broadband range,have the advantage of lightweight,and very well make up for shortcomings of existing phononic crystal models in field of broadband noise control.

关 键 词：声子晶体 双通路降噪 宽频带降噪 噪声抑制 

分 类 号：TB535[理学—物理]