Parametric roll prevention systems are designed to
prevent the build up of parametric roll in head or following
seas.
Sea keeping model tests demonstrate that the Intering
parametric roll prevention system can reduce the risk
of parametric excitation by shifting the critical wave
threshold to such high values that the chances of ever
encountering such a roll during a vessels service life
are extremely low.
Features and benefits
- Prevents the build up of parametric roll in head
or tail winds for improved safety
- Reduces regular ship roll by about 20 per cent
- Automatic response – the system is always
in standby mode and ready for action
A typical example of a complete ship system will include
several pairs of U-shaped tanks and pneumatically controlled
air valves, plus a control unit with pitch and role
sensors.
The controller detects the onset of parametric rolling
and uses the damping effect of the tanks fluid oscillations,
which are controlled by air valves in accordance with
the ship’s motion.
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