隔声材料排布顺序对复合板材隔声特性的影响

对高速列车平顶组合结构进行隔声测试,调换其中2块隔声垫的前后位置后,平顶组合结构隔声特性发生显著改变。针对这一问题,基于统计能量法探究双层隔声复合板材中材料排布顺序对于整体结构隔声特性的影响规律,分析该现象产生的原因;接着,进一步利用基于统计能量法的隔声预测模型对三层隔声复合板材中材料排布顺序对整体隔声特性的影响进行延伸探究。结果表明:对于双层复合结构,当两种隔声材料的种类一定时,将隔声量较大的材料置于近声源端,将隔声量较小的置于远声源端,对整体结构隔声量的提升最显著,主要提升低频隔声量;对于三层复合结构,情况较为复杂,其中,将隔声量最大的材料置于近声源端,将隔声量次大的材料置于远声源端,将隔声量最小的材料置于中间时,对整体结构隔声量的提升最显著,且同时提升低频和中频隔声量。研究内容对于工程中复合材料隔声性能的进一步改善有借鉴意义。

Influence of the Insulation Material Arrangement on Sound Insulation Properties of Composite Sheets

The insulation test to a combination of high-speed train flattened structure, when the swap in which two acoustic longitudinal position pad, flat top acoustic properties of composite structure changed significantly. To solve this problem, this paper based on statistical energy analysis explores the double insulation composite sheet material arranged in the order of the overall structure of sound insulation characteristics of law, analyzes the causes of the phenomenon；Subsequently, further use of statistical models to predict the impact energy method three acoustic insulation composite sheet material arranged in order of overall sound insulation properties of inquiry was extended. The results show that: for double-layer composite structure, when the two types of insulation materials is constant, the large amount of insulation material is placed near the sound source, the small amount of noise into the far end of the sound source, the lift the overall structure of the maximum amount of noise, major upgrade of the low-frequency sound insulation; For the three-layer composite structure, the situation is more complex, when the largest insulation material is placed near the sound source, the second largest amount of insulation material is placed in the far end of the sound source, the minimum amount of sound insulation material is placed in the middle, to enhance the amount of the overall structure of the maximum amount of noise, and also to enhance the low and intermediate frequency sound insulation. Contents of this paper to further improve the sound insulation properties of composite engineering has reference.