城市轨道交通对建筑物室内噪声辐射试验研究

Experimental research on indoor noise radiated by urban rail transit

为探究城市轨道交通简支箱型梁对沿线建筑物室内噪声的辐射特性,以某城市轨道交通高架段为研究对象,通过室内噪声测试并对测试数据进行等效连续A声压级分析、频谱特性分析及不同计权方式下的1/3倍频程分析.研究结果表明:列车经过时等效连续A声压级平均值为55.8dB;3个测点在50~60 Hz范围内取得全局噪声声压峰值;线性计权及C计权下的声压级峰值均出现在50 Hz处,G计权峰值出现在12.5Hz处,A计权峰值出现在800Hz处;A计权对于中低频噪声有一定程度的削弱,尤其对100 Hz以下的低频噪声;C计权对100Hz以下的低频噪声虽有一定程度的削弱,但其程度远低于A计权;G计权对低于20 Hz的次声有很大程度的放大作用.

In order to study the indoor noise radiation characteristics of the box girder of ur-ban rail transit, this paper takes the elevated section of an urban rail transit as the research object. Conducting indoor noise test？ it makes the analysis of the test data by the equivalent continuous sound level A the spectrum characteristics and the 1/3 octave analysis under dif-ferent weighting methods. The results show that the equivalent continuous sound level A is 55. 8 dB. Three measurement points in the 50-60 Hz range to obtain the global noise peak pressure; the peak value of the sound pressure level under the weight of the linear weighting and the weight C is at the 50 Hz,the weight G at 12. 5 Hz,and the weight A at 800 Hz. Weighting A has a certain degree of weakening in the low frequency noise especially in low frequency noise below 100 Hz; Weighting C has a certain degree of weakening in the low fre-quency noise below 100 Hz but it can＇ compare with the weighting A; the weighting G has a large degree of amplification for infrasound below 20 Hz.