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Marine Installation Manual 2022-03 6-4

6 Engine Dynamics

6.1 External mass forces and moments

X62DF-S2.0

For the use of only a single iELBA, the mode shapes of the vertical hull girder vi-

brations must be considered. If the mode shapes of the vertical hull girder vibra-

tions are unknown, the application of only a single iELBA may be ineffective.

The calculation of the vertical hull girder frequencies, the corresponding mode

shapes and consequently the decision on the number of iELBA systems to be in-

stalled is the responsibility of the shipyard.

Electrically-driven compensator (external compensator)

Alternatively, or if the ship’s vibration pattern is not known at an early stage, an

electrically-driven compensator can be installed or retrofitted if disturbing

second order vibrations should occur. As seen in Figure 6-3, such a compensator

is usually installed in the steering gear compartment. It is tuned to the engine op-

erating speed and controlled accordingly.

Figure 6-3 Locating an electrically-driven compensator

NOTE

The iELBA system cannot be retrofitted to the engine. The iELBA must

be ordered, designed and implemented on the engine prior to manufac-

turing.

SM-0031

= F

× L

Electrically-driven

order

compensator

WinGD X62DF-S2.0 User Manual

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