Analysis of correlation between floor vibration and structure-borne noise in high-rise residential building near subway
Structure-borne noise is the most direct reason for residents' annoyance in the buildings near subways. Studying the correlation between structure-borne noise and indoor floor vibration is a key issue for indoor structure-borne noise prediction and control in residential buildings. The high-rise residential building adjacent to a subway line was taken as the research object. The floor vertical acceleration and indoor structure-borne noise of four rooms of different sizes were obtained through a multi-point synchronous test. The frequency characteristics of floor vertical acceleration indoor sound pressure and the coherence between them were analyzed. The differences between the vibration dominant frequency range,noise dominant frequency range,and coherent frequency range between them in four rooms were compared and analyzed. The reason for the differences of the coherence between acceleration and sound pressure in different rooms was disclosed by the numerical simulation method. At the same time,based on the discrete characteristics of floor vibration level induced by different trains' pass-by,linear fitting optimization between vertical acceleration level (VAL) and sound pressure level (SPL) at structure-borne noise typical 1/3 octave bands was conducted to analyze the relationship between the two and its correlation with room characteristics. The results are drawn as follows. The vertical floor acceleration dominant frequency range and the sound pressure dominant frequency range significantly changed with room size. The peak frequencies of sound pressure in four rooms were 49 Hz,40 Hz,50 Hz,49 Hz,and 65 Hz,respectively,and the vibration dominant frequency range and the noise dominant frequency range were non-fully overlapped. The coherent frequency range and vibration dominant frequency range were partially overlapped,while it was non-overlapped with noise dominant frequency. Affected by the natural mode of room acoustic cavity,the coherence at noise peak frequencies were low that the coherence coefficients were all less than 0.5. Due to the influence of room acoustic mode,the correction between floor VAL and indoor SPL at four 1/3 octave bands (40,50,63,and 100 Hz) in four rooms with different sizes was changed from 12.0 dB to 34.9 dB. Structure-borne noise prediction should be classified by 1/3 octave band,and the floor vibration dominant frequency range and room acoustic natural mode were taken into account. The results of this research can provide a reference for the prediction of indoor structure-borne noise in residential buildings near subways.
万方数据
维普
