Abstract：Here, aiming at poor low frequency sound absorption performance of single foam aluminum porous plate, a sound absorption structure of “aluminum foam plate-quadratic residue diffuser (QRD)” composite absorber was proposed, it could take in account both low frequency and broadband sound absorption. The analysis model for the aluminum foam plate-7th order QRD composite absorber was established, this model was substantialized and experimental measurements for its normal incidence sound absorption coefficient were conducted in impedance tube. The correctness of the analysis model was verified through comparing its analysis results with experimental ones. Effects of multiple structural parameters of this model-based composite absorber on its sound absorption performance were analyzed. Influence laws and reasons of the maximum depth of QRD back cavity and QRD order number on the composite absorber’s sound absorption performance were analyzed. Three nested compound absorbers were designed, and the asymmetric and unequal width distribution nested compound absorber could have good broadband sound absorption characteristics. Effects of main structural parameters of aluminum foam plate on the composite absorber’s sound absorption performance were analyzed to reveal the change of porosity having a larger influence on sound absorption coefficient.
［1］朱世婷. PCM法泡沫铝及其复合结构制备工艺优化研究［D］. 太原:太原科技大学,2015.
［2］FUJIWARA K, MIYAJIMA Y. Absorption characteristics of a practically constructed Schroeder diffuser of quadratic-residue type［J］. Applied Acoustics, 1992, 35(2):149-152.
［3］DEGRANDIS J J. Particle simulations advance insight into diffusion device design, efficiency, and diffuse field development and propagation［J］. Journal of the Acoustical Society of America, 2015, 137(4):2333-2333.
［4］RAVANELLI M, SVAIZER P, OMOLOGO M. Realistic multi-microphone data simulation for distant speech recognition［C］// Interspeech. 2016.
［5］刘玲. 二次余数扩散体声屏障顶部结构的抗性优化研究［D］. 上海:上海交通大学, 2013.
［6］任重义. 二次余数扩散结构声学扩散性能仿真模拟研究［D］. 济南:山东大学, 2016.
［7］刘玲, 王佳琛, 包飞, 等. 微穿孔板二次余数扩散体复合结构阻抗管实验研究［J］. 声学技术, 2015, 34(2):162-166.
LIU Ling, WANG Jiachen, BAO Fei, et al. Experimental research on impedance tube of composite structure made by quadratic residue diffuser and micro-perforated plates［J］. Technical Acoustics, 2015, 34(2):162-166.
［8］蔡俊, 包飞, 王亚晨. 二次余数扩散结构复合穿孔板扩散吸声研究［J］. 声学学报, 2016, 41(2): 243-248.
CAI Jun, BAO Fei, WANG Yachen. A study on diffusion and absorption properties of the quadratic residue diffuser structure composited with perforated plate［J］. ACTA Acustica, 2016, 41(2): 243-248.
［9］闵鹤群, 郭文成. 具有并联不等深度子背腔序列的微穿孔板吸声体吸声特性［J］. 东南大学学报(自然科学版), 2017, 47(1): 177-183.
MIN Hequn, GUO Wencheng. Absorption characteristics of micro-perforated panel sound absorbers with array of parallel-arranged sub-cavities with different depths［J］. Journal of Southeast University (Natural Science Edition), 2017, 47(1): 177-183.
［10］GUO Wencheng, MIN Hequn. A compound micro-perforated panel sound absorber with partitioned cavities of different depths［J］. Energy Procedia, 2015, 78:1617-1622.
［11］包飞. (微)穿孔板复合对二次余数扩散结构扩散性能影响研究［D］. 上海:上海交通大学,2014.
［12］陈文清. 多孔材料参数反演及其在消声器仿真中的应用［D］. 贵阳:贵州大学, 2018.
