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2.2.5
Ship motion and offset from the ship's motion centre
When installing the ADU you must consider the mounting height carefully. The higher up
the ADU is mounted, the higher is the linear g force applied to the ADU. The g force also
depends on the roll period of the ship, see Table 2-1. If the g force applied is too high,
performance and ADU signal stabilization may be reduced and eventually the ADU may
be damaged. See the following table for allowed mounting heights above the ship's
motion centre.
Figure 2-5: Maximum distance from the ship's motion centre (h max)
Even though it is recommended to mount the ADU high, keep the distance between the
ADU and the ship's motion centre as short as possible.
Min.
roll period
4 s
6 s
8 s
10 s
Table 2-1: Maximum distance from the ship's motion center versus
Maximum ADU mounting height (h max)
Full
Potential risk of damage
performance
12 m
16 m
27 m
35 m
48 m
62 m
75 m
98 m
ship's roll period
Site preparation
2-7
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