198
L. Picu et al.
Fig. 4 Comparison between
WBV ()—in control room;
()—in engine room
engine room, the value of 113 dB (from Table 8) is higher with 41.25% and 32.94%
than the provisions of the Directive.
In Fig. 7 and Table 9, it can be seen that there is not a great difference between the
sound levels in the control room and those inside the engine room; but these values
surpass not only the lower exposure action value but also the upper exposure action
value.
Table 9 is presented the analysis of the sound level average for each day of
the journey in both cases. The overall average does not differ much (99.5 dB in
the control room compared to 107.66 dB in the engine room), but its distribution is
interesting (Fig. 8): If for engine room there is some uniformity around 107 dB, for
control room, this distribution has a more sinusoidal shape, depending on how hard
the engine was forced, which in turn depends on the specific weather conditions of
each day.