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Analysis and Evaluation of Indoor Structural-borne Noise Characteristics in Ultra High-rise Building above a Metro Depot
2024, 44(6):
242-248.
Domestic standards often use equivalent continuous A-weighted sound pressure level to evaluate structure-borne noise induced by subway, with an evaluation range of 16 Hz-200 Hz. However, the A-weighted sound pressure level significantly attenuates the low-frequency portion. The data used to analyze the distribution pattern of structure-borne noise and verify the applicability of equivalent continuous A-weighted sound pressure level with loudness was measured in an ultra high-rise building above a metro depot. The results show that the frequency range of indoor noise in the ultra high-rise building decreased with the floor increasing; with the upper limit of the analysis frequency changing from the standard’s 200 Hz to the actual distribution, the amplitude of the change in the equivalent continuous A-weighted sound pressure level is difficult to detect by the human ear, while the change in the loudness level can be clearly perceived by the human ear; the proportion of energy above 200 Hz is small, but its impact on loudness is significant and should not be ignored. It is highly possible to underestimate the impact of structure-borne noise in ultra high-rise buildings with the equivalent continuous A-weighted sound pressure level of 16 Hz-200 Hz. The results have theoretical significance for effectively evaluating the structure-borne noise induced by subway.
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