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FAULT TOLERANT CONTROL OF ROTOR SWING 37
STABILIZER SYSTEM USING FMEA METHOD

 The pair of hydraulic cylinders can be deployed and retracted, and stowed under the
hull while not in operation. Stowage of the hull unit at higher sailing speeds should not
let more appendage drag on hull.

 The system has a wide application area such as high speed semi displacement vessels,
displacement vessels, and commercial vessels. Owners who have not specified a
modern stabilization system have set up easily the stabilizer unit, and system will be
chosen as a factory options in the upcoming years. However, retrofit of the system
would not be preferred if the ship’s hull does not suit to parking mode position of the
rotors.

 Systems does not need for hydraulically operation like fins or gyroscopes. On the
contrary, the fully electronic retractable system leads to smooth and silent operation.
Park and drive position, RPM, and direction of rotation of the stabilization element can
be controlled precisely thanks to the motion sensors, speed sensors, position sensors,
and servo valves.

 As previously stated, geometric feature of the rotors take a small space which is an
advantage in comparison with the fin systems. Rotorswing [5] illustrated how advanced
stabilizer system which is worked with the phenomenon called Magnus effect can be
operated between the 3 – 14 knots.

 The rotor’s hydraulic system is equipped with automatic retract mechanism to allow the
rotor to swiftly stow in case of impact during operation. While not in operation, the
rotor is elegantly stowed along the hull, where it offers minimal possibility of impact
and minimal effect during maneuvering conditions. In case of severe impact, half of the
rotor tube will break away, in a design feature intended to sacrifice the rotor unit in
order to preserve hull integrity.

4. Fault Diagram of Rotor Swing Stabilizer System
This system is composed by the control unit, sensors and stabilizer system (see Figure 5).
Above those components, a controller calculates set-points for rotor speed rref, referenced
current for cruising speed cref, and inclination angle aref, (see Figure 6). The target of the
stabilizer system is to maintain the boat’s ability to stabilizer itself.

Figure 5. Block scheme of rotor swing stabilizer system.

Sayı 7, 2016 GiDB|DERGi