隔声结构的声学性能试验及仿真分析

Acoustic property testing and simulation analysis on sound-insulation structures

试验测量和仿真计算是隔声结构声学性能研究的重要方法.首先对隔声结构声学性能试验测量的混响室法和阻抗管法进行介绍,并分析2种方法的优缺点以及适用范围,为隔声性能测量方法的选择提供依据;同时,将有限元法和统计能量分析法用于隔声结构的声学性能仿真计算,并将计算结果与实验测量结果以及理论公式计算结果进行对比分析,结果表明,理论公式的计算结果与试验测量结果相差很大,特别在吻合频率附近,只能对隔声结构的声学性能进行初步预估.而有限元法和统计能量分析法计算结果与试验测量结果吻合良好,适用于隔声结构的声学性能仿真计算.

The tested measurement and simulated computation secure crucial positions in acoustic property study on sound-insulation structures. In this study, the reverberant room and impedance tube methods are first introduced to the acoustic tested measurement. Meanwhile, relevant advantages, disadvantages and application range are analyzed for the selection of sound-insulation property measurement methods. Subsequently,the acoustic property simulated computation is conduced on sound-insulation structures using the finite element method （FEM） and statistical energy analysis （SEA）. By comparing amongst the simulated computation, tested measurement and theoretical formula computation, it is observed that there exists a significant difference between results from theoretical formula computation and tested measure- ment. Specifically for the vicinity of coincidence frequency,only an initial estimation can be conducted on acoustic properties. Hence, the results from FEM and SEA are highly consistent with those from tested measurement. Therefore, the proposed methods are proven feasible for acoustic property simulated computation on sound-insulation structures.