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S. Simion et al.
• Loading of convoy wagons by free fall from silos in CFR wagons;
• Frontal loading USM in auto trucks.
Because of increased production capacity, supplementation of transport capacity
of industrial railway with auto transportation was necessary, leading to an increase in
noise level generated in the environment affecting neighbourhoods. Part of the UMSs
from quarries is stored in siloes according to their grading, and other part is stored in
piles on the ground for auto transport by dumpers. This loading/unloading activity
generates an intense noise level that can affect both workers and neighbourhoods
(households) [1].
In order to quantify effects and reduce the level of noise pollution, noise audit is
performed, which involves the following steps:
• Measurement of noise level produced by the economic activity at points of interest
by sonometric measurements performed according to applicable standards;
• Identifying major noise sources and the contribution each has to noise levels;
• Evaluating the level of noise from analysed activity by comparison with maximum
admissible values according to applicable national legislation and in force
standards;
• Suggesting works and measures to reduce noise level;
• Evaluating the effectiveness of different suggested or predicted technical variants
to reduce noise level for workers at reception points considered sensitive.
In order to identify sites liable to be exposed to noise levels above allowed limits at
functional area limit, the SR 10009: 2017 standard limits were used, also performing
spectrograms of workplaces where it was considered necessary to apply a complex
of measures to reduce noise. The successive implementation of these measures will
achieve the ultimate goal of reducing exposure to noise, respectively, that workers
are not affected by noise.
2 Working Instruments
For measuring noise levels, Bruel & Kjaer type 2250 Danish construction integrated
sonometers equipped with 1 octave and/or 1/3 octave bandwidth filters, Bruel & Kjaer
type 4231 calibrators and the BZ 5503 measurement visualization software were
used. In order to ensure quality of measurement results, the sonometers and calibrators used have been subjected to metrological verification, following requirements
of current legislation [2].
The 2250 type noise analyser (Fig. 1) is used to perform individual measurements
or measurement series for laboratory and field analysis.
The acoustic calibrator (Fig. 1) is used to check the sonometers used for measurements, to obtain high accuracy results (checking is performed both before and after
a series of measurements).
S. Simion et al.
• Loading of convoy wagons by free fall from silos in CFR wagons;
• Frontal loading USM in auto trucks.
Because of increased production capacity, supplementation of transport capacity
of industrial railway with auto transportation was necessary, leading to an increase in
noise level generated in the environment affecting neighbourhoods. Part of the UMSs
from quarries is stored in siloes according to their grading, and other part is stored in
piles on the ground for auto transport by dumpers. This loading/unloading activity
generates an intense noise level that can affect both workers and neighbourhoods
(households) [1].
In order to quantify effects and reduce the level of noise pollution, noise audit is
performed, which involves the following steps:
• Measurement of noise level produced by the economic activity at points of interest
by sonometric measurements performed according to applicable standards;
• Identifying major noise sources and the contribution each has to noise levels;
• Evaluating the level of noise from analysed activity by comparison with maximum
admissible values according to applicable national legislation and in force
standards;
• Suggesting works and measures to reduce noise level;
• Evaluating the effectiveness of different suggested or predicted technical variants
to reduce noise level for workers at reception points considered sensitive.
In order to identify sites liable to be exposed to noise levels above allowed limits at
functional area limit, the SR 10009: 2017 standard limits were used, also performing
spectrograms of workplaces where it was considered necessary to apply a complex
of measures to reduce noise. The successive implementation of these measures will
achieve the ultimate goal of reducing exposure to noise, respectively, that workers
are not affected by noise.
2 Working Instruments
For measuring noise levels, Bruel & Kjaer type 2250 Danish construction integrated
sonometers equipped with 1 octave and/or 1/3 octave bandwidth filters, Bruel & Kjaer
type 4231 calibrators and the BZ 5503 measurement visualization software were
used. In order to ensure quality of measurement results, the sonometers and calibrators used have been subjected to metrological verification, following requirements
of current legislation [2].
The 2250 type noise analyser (Fig. 1) is used to perform individual measurements
or measurement series for laboratory and field analysis.
The acoustic calibrator (Fig. 1) is used to check the sonometers used for measurements, to obtain high accuracy results (checking is performed both before and after
a series of measurements).