192
L. Picu et al.
Table 2 Requirements of
ISO 2631:2018
Exposure action value (EAV)
Exposure limit value (ELV)
0.5 m/s 2 A(8) r.m.s.
1.15 m/s 2 A(8) r.m.s.
9.1 m/s 1.75 VDV
21 m/s 1.75 VDV
3.1 Measurement of Whole-Body Vibration (WBV)
Assuming that we only refer to the HAB criteria (not HAB+ and HAB++), the
maximum RMS level must be below 0.214 m/s
2 (Guide for crew habitability on
ships: 2016). The whole analysis of vibrations transmitted to the human body was
made in relation to the requirements of ISO 2631:2018 which state that (Table 2).
From the measurements and calculations made for WBV, HAV and noise level in
the four cases (starts from the shore, ship’s running, mooring maneuver, idle with
generator), the following values were obtained (Tables 3, 4, 5, 6, 7 and 8):
In the case of whole-body vibration, analyzing time to reach EAV (A(8) option)
for all situations, it is found that they have equally sensitive values in the control room
and inside the engine room, for all the four cases of motion of the ship (Tables 3 and
4). On the other hand, for the time to reach ELV (A(8) option), there are significant
differences between the values calculated for the control room and the engine room:
If the ship starts from the shore, the T ELV for the engine room is 2.9% higher than
T ELV for the control room. When the ship is running T ELV is 44.4% higher than
TELV for the control room, during the mooring maneuver is 36% higher and while
idling with the generator is 18.4% higher (Fig. 4). These values show that work on
the engine room is more harmful in terms of vibrations than the inside control room.
3.2 Measurement of Hand-arm Vibration (HAV)
Vibrations transmitted to the arm system were measured in the same four cases: ship
starts from the shore, ship is running, mooring maneuver and idle with generator
turned on, in the control room and engine room (Tables 5 and 6).
In the case of hand-arm vibrations (Fig. 5), analyzing the time to reach EAV (A(8)
option) for all situations, they are almost double inside the engine room relative to the
control room (except idle with generator). On the other hand, for time to reach ELV
(A(8) option), the values are equal to or greater than 24 h (except for the mooring
maneuver where it is 17 h). These values show that work inside the engine room
is more dangerous in terms of vibrations than on the control room. Besides, in the
case of engine room, the computer has given then warning on exceeding of the limit
values.
L. Picu et al.
Table 2 Requirements of
ISO 2631:2018
Exposure action value (EAV)
Exposure limit value (ELV)
0.5 m/s 2 A(8) r.m.s.
1.15 m/s 2 A(8) r.m.s.
9.1 m/s 1.75 VDV
21 m/s 1.75 VDV
3.1 Measurement of Whole-Body Vibration (WBV)
Assuming that we only refer to the HAB criteria (not HAB+ and HAB++), the
maximum RMS level must be below 0.214 m/s
2 (Guide for crew habitability on
ships: 2016). The whole analysis of vibrations transmitted to the human body was
made in relation to the requirements of ISO 2631:2018 which state that (Table 2).
From the measurements and calculations made for WBV, HAV and noise level in
the four cases (starts from the shore, ship’s running, mooring maneuver, idle with
generator), the following values were obtained (Tables 3, 4, 5, 6, 7 and 8):
In the case of whole-body vibration, analyzing time to reach EAV (A(8) option)
for all situations, it is found that they have equally sensitive values in the control room
and inside the engine room, for all the four cases of motion of the ship (Tables 3 and
4). On the other hand, for the time to reach ELV (A(8) option), there are significant
differences between the values calculated for the control room and the engine room:
If the ship starts from the shore, the T ELV for the engine room is 2.9% higher than
T ELV for the control room. When the ship is running T ELV is 44.4% higher than
TELV for the control room, during the mooring maneuver is 36% higher and while
idling with the generator is 18.4% higher (Fig. 4). These values show that work on
the engine room is more harmful in terms of vibrations than the inside control room.
3.2 Measurement of Hand-arm Vibration (HAV)
Vibrations transmitted to the arm system were measured in the same four cases: ship
starts from the shore, ship is running, mooring maneuver and idle with generator
turned on, in the control room and engine room (Tables 5 and 6).
In the case of hand-arm vibrations (Fig. 5), analyzing the time to reach EAV (A(8)
option) for all situations, they are almost double inside the engine room relative to the
control room (except idle with generator). On the other hand, for time to reach ELV
(A(8) option), the values are equal to or greater than 24 h (except for the mooring
maneuver where it is 17 h). These values show that work inside the engine room
is more dangerous in terms of vibrations than on the control room. Besides, in the
case of engine room, the computer has given then warning on exceeding of the limit
values.