阻尼材料对地铁车辆地板隔声性能的影响

Effect of Damping Materials on Floor Sound Insulation for Metro Vehicles

以常见地铁车辆地板(a类、b类)为研究对象,结合VA one仿真分析,探讨两类地铁车辆地板隔声特性分布以及阻尼材料厚度对隔声量的影响规律。仿真结果表明,b类地板在315～800 Hz区间内隔声优势明显,而a类地板的隔声优势区间在100～250 Hz与800～3 150 Hz频率范围。在b类地板上敷设不同厚度的阻尼材料,随着阻尼材料厚度增加,隔声量增大,但隔声效率降低,其中4 mm阻尼材料的隔声效率最优。

Taking two common metro floors(type A and type B)as the research objects,and based on VA one simulation analysis,the influence of metro floor sound insulation property distribution and the damping material thickness on sound transmission loss is discussed.A simulation result shows that type B aluminum floor has obvious sound transmission loss advantages within the frequency range of 315~800 Hz,while in the frequency range of 100~250 Hz and 800~3 150 Hz,the sound transmission loss of type A aluminum floor is better.With the increase of the damping material thickness,the sound transmission loss is also increasing,but the sound insulation effect is gradually reduced.When the thickness of damping material reaches 4 mm,the efficiency of sound transmission loss is the best.