低频噪声干扰的评价标准和控制技术

本文对16—31.5Hz范围的低频噪声对居民的干扰作了调查,对噪声源进行了测试和分析。在控制前,对措施作了分析;在施工过程中,逐项进行了检验。在峻工后作了全面测试。结果表明,在按影响严重性区分的居民区Ⅰ、Ⅱ和Ⅲ中,25Hz峰值声压级分别从原有的95dB降至74dB,91dB降至66dB,83dB降至65dB,达到满意的效果。
我们结合措施设计,对低频隔声作了理论估算并与实验作了比较,证明在劲度控制区利用有效劲度,理论和实验符合很好。还从对居民的调查中,提出一个低频声干扰的初步建议。

INFLUENCE OF LOW FREQUENCY NOISE AND ITS CONTROL

The influence of low frequency noise within 16 to 31.5 Hz has been surveyed and measured. The properties of the noise source are analysed before the control and in the course of the control. Final test shows that the SPL in the resident area I, II and III classified according to the seriousness of the interference may be reduced from 95 dB to 74 dB, 91 dB to 66 dB, and 83 dB to 65 dB respectively.
We calculated the low frequency sound transmission loss of wall and compared them with the experiments. If the effective stiffness we proposed is used the experiments are well in accordance with the calculation. In addition, we propose some criteria for low frequency noise interference according to our survey results.