穿孔板-膜腔复合型隔声板隔声特性研究

Sound Insulation Characteristics of Perforated Plate-membrane Cavity Composite Sound Insulation Plates

为解决动力设备运转过程中所产生低频噪声的问题,在薄膜型声学结构的基础上,提出一种穿孔板-膜腔复合型声学结构,采用有限元方法探究结构的声振特性及其隔声机理。以穿孔板-膜腔复合型声学结构为基础,建立大尺寸隔声壁板模型,系统探究结构尺寸、材料参数及构型方式对其隔声性能的影响规律,并结合仿真结果提出一种多层薄膜型穿孔板-膜腔复合型隔声板设计方案,可有效拓宽结构隔声频带,改善隔声性能。

In order to solve the problem of low frequency noise during the operation of power equipment,based on the membrane acoustic structure,a kind of perforated plate-membrane cavity composite acoustic structure was proposed.By the finite element method,the acoustic and vibration characteristics of the structure and its sound insulation mechanism were analyzed.Based on the structure,a large size acoustic insulation panel model was established,the influences of structural size,material parameters and configuration mode on its sound insulation performance were systematically investigated,and a multi-layer thin-film perforated panel-membrane cavity composite acoustic insulation panel design scheme was proposed according to the simulation results,which can effectively broaden the structural sound insulation band and improve the sound insulation performance of the panel.