汽车试验场噪音试验路吸声系数研究

Study on the Sound Absorption Coefficient of Automotive Proving Ground Noise Testing Road

依托汽车试验场施工项目,进行了噪音试验路AC-8表面层配合比设计。通过轮碾成型试件的室内吸声系数测定,验证配合比的吸声效果。通过严格的施工质量控制,铺筑了噪音路面试验段,试验路各项指标均满足要求。建成后,进行了2次的行车车道、传播区域的吸声系数测定。测试结果表明,噪音试验路面在运行1年后仍旧维持较低的吸声系数,吸声系数没有明显增长,在低频段吸声系数的标准差有所增大。

Relying on the construction project of automotive proving ground,the mix proportion design of noise testing road AC-8 surface layer is carried out.The indoor sound absorption coefficient of wheel molding specimens is measured to verify the sound absorption effect of mix proportion.Through strict construction qual-ity control,the noise pavement test section is paved and all the indexes satisfied the requirements.After com-pletion,the sound absorplion coefficients of carriageway and propagation area are measured twice.The lest re sults showed that the noise test pavement still maintained a low absorption coefficient after one year operation,the sound absorption coefficient does not increase significantly,and the standard deviation of the sound absorp-tion coefficient increased in the low frequency band.