Measurement of low-frequency noise during CNC machining and its assessment

The noise exposure measurement described in the paper was carried out during production of cars parts that were machined by a CNC machine. The measurement results showed that when weighting filter Z was used, the acoustic pressure levels were higher than those measured by weighting filter A by 22.8 dB. The measured equivalent LZeq values for the given work activity were 73.4 dB(Z) and LAeq was 50.6 dB(A). At low frequencies, this difference was the most pronounced, up to several times higher.