Marine Installation Manual
2021-08
6-9
6 Engine Dynamics
6.2 External lateral forces and moments
X72DF
Figure 6
-
7 General arrangement of hydraulic type stays for both-side installation
Electrically-driven compensator
If lateral stays cannot be installed, the following can be used to reduce lateral en
-
gine vibrations:
•
For H-type mode, one electrically-driven compensator can be installed on
the upper platform in the longitudinal centre point of the engine. This re
-
duces the lateral engine vibrations and the effect on the ship’s superstruc
-
ture. Alternatively, two compensators, one fitted at each end of the engine
upper platform, can be applied, synchronised in phase.
•
For X-type vibration, two compensators, one fitted at each end of the en
-
gine upper platform, are necessary and are synchronised in counter-phase.
It must be noted that electrically-driven compensators can only compensate one
harmonic excitation frequency at a time.
two stays
on exhaust side
two stays
on fuel side
and
SM-0097
