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.