Mitigating Noise Pollution Level When Loading Useful Mineral …
207
Fig. 1 Bruel & Kjaer type
2250 analyser and 4231 type
acoustic calibrator
The 4231 type acoustic calibrator was used to perform acoustic calibration. It
provides a stable sound pressure at 1 kHz and is least influenced by environmental
factors.
If the calibration differs by more than ±1, 5 dB from the initial one, then the
sonometer used is checked to see if it is appropriate in terms of standards.
In reporting the measurement results, an estimate of the overall measurement
uncertainty was included, taking into account influence of factors such as:
• measuring apparatus;
• microphone location;
• number of measurements;
• variation in time and space of noise source.
3 Case Study
Within research activities carried out by INCD INSEMEX Petro¸ sani, a series of
measurements were performed on economic operators active in loading of useful
mineral substances (UMS) in means of transport and CFR wagons according to
national legislation in force [3].
In order to meet requirements of noise audit, noise level measurements have been
performed taking into account location of main noise-generating equipment. Spectral analysis was necessary to obtain data on characteristics of noise generated by the
equipment for choosing sound absorbing/soundproofing materials compatible with
particularities of analysed noise. Assessment of the efficiency of various technical
variants suggested or predicted to reduce noise level for workers at reception points
considered sensitive was performed by taking into account noise characteristics
(noise level by frequency) [4].
In order to quantify noise level for establishing necessary technical and organizational measures, noise level measurements were performed according to SR 10009:
2017.
207
Fig. 1 Bruel & Kjaer type
2250 analyser and 4231 type
acoustic calibrator
The 4231 type acoustic calibrator was used to perform acoustic calibration. It
provides a stable sound pressure at 1 kHz and is least influenced by environmental
factors.
If the calibration differs by more than ±1, 5 dB from the initial one, then the
sonometer used is checked to see if it is appropriate in terms of standards.
In reporting the measurement results, an estimate of the overall measurement
uncertainty was included, taking into account influence of factors such as:
• measuring apparatus;
• microphone location;
• number of measurements;
• variation in time and space of noise source.
3 Case Study
Within research activities carried out by INCD INSEMEX Petro¸ sani, a series of
measurements were performed on economic operators active in loading of useful
mineral substances (UMS) in means of transport and CFR wagons according to
national legislation in force [3].
In order to meet requirements of noise audit, noise level measurements have been
performed taking into account location of main noise-generating equipment. Spectral analysis was necessary to obtain data on characteristics of noise generated by the
equipment for choosing sound absorbing/soundproofing materials compatible with
particularities of analysed noise. Assessment of the efficiency of various technical
variants suggested or predicted to reduce noise level for workers at reception points
considered sensitive was performed by taking into account noise characteristics
(noise level by frequency) [4].
In order to quantify noise level for establishing necessary technical and organizational measures, noise level measurements were performed according to SR 10009:
2017.