Analysis and Evaluation of Indoor Structural-borne Noise Characteristics in Ultra High-rise Structure above a Metro Depot
Domestic standards often use equivalent continuous A-weighted sound pressure level (ECAWSPL) to evalu-ate structure-borne noise induced by subway in the evaluation range of 16-200 Hz.However,the A-weighted sound pres-sure level significantly attenuates in the low-frequency portion.In this work,according to the measurement data in an ultra high-rise building above a metro depot,the distribution pattern of structure-borne noise was analyzed,and the applicability of the ECAWSPL was verified through the comparison of loudness.The results show that the frequency range of indoor noise in the ultra high-rise building decreases with the floor increasing,the higher the floor level is,the narrower the frequen-cy band is.When the frequency band of the analysis frequency changing from the standard-suggested 16-200 Hz to the actu-al frequency band distribution,the amplitude changing in the ECAWSPL is hardly to be detected by human audition,while the change in the loudness level can be clearly perceived by the human audition;the proportion of energy above 200 Hz is small,but its impact on loudness is significant and should not be ignored.If the ECAWSPL of 16-200 Hz is still used to es-timate the structure noise in ultra high-rise buildings in this case,it is very possible to underestimate its loudness.The results of this research have theoretical significance for effective evaluation of the structure-borne noise induced by subways.
万方数据
维普
