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FAULT TOLERANT CONTROL OF ROTOR SWING 33
STABILIZER SYSTEM USING FMEA METHOD

FAULT TOLERANT CONTROL OF ROTOR SWING STABILIZER
SYSTEM USING FMEA METHOD

Deniz ÖZTÜRK*and Hakan AKYILDIZ**
Istanbul Technical University | * ozturkdeni@itu.edu.tr, ** akyildiz@itu.edu.tr

ABSTRACT

In this article, rotor swing stabilizer system has been analyzed according to fault tolerant control (FTC)
methodology. Fault tolerant control is presented in a general framework and Failure Mode and Effects
Analysis (FMEA) is applied as a fault analysis method. The focus was on the category of requirements,
process and components to find risky elements and provide solutions. The general methodology covered
the failure mode and effect analysis and implementation of fault tolerant control systems on an overall
level but still have a potential for improving immunity to component faults.

Keywords: Magnus effect, Failure mode and effect analysis, Fault tolerant control, Stabilizer system.

1. Introduction

Demand for marine and conventional transportation between ports increases with each passing
day. It is important to minimize the possible risks in environment that exposed constant external
forces. Rolling is an undesirable movement at sea, causes dangerous inclining, so stresses based
upon roll motion on the hull should be avoided.

This work concentrates upon rotor swing stabilizer system [3, 5, 6] which is based upon studies
at seventies and a feature of an emerging technology. Thanks to the Magnus effect phenomenon
[4] which observed its effects at some ball sports, system creates lift to damping the roll motion
with spinning cylinders. The rotor swing stabilizer system performs to create good stability on
board is preferential for safety and comfort. However, potential risks of such automated systems
which are vulnerable to fault should be considered while design phase. Defect in motion
sensors, speed sensors or position sensors, servo valves and all the other parts of system can be
examined by the closed-loop control systems circumstantially. Detection of possible faults
makes it possible to tolerate constituent malfunctions.

To enhance the reliability, safety, economically and fault tolerance, it is important to plan
control systems which are competent on tolerating potential faults, in a word, fault tolerant
control [1, 2]. For increasing the performance of the rotor swing stabilizer system, new methods
to control system design have been developed by using failure mode and effect analysis [7, 8].

2. Fault Tolerant Control

At the point when a fault happens in a system, the fundamental issue to be tended to will be to
raise a caution, in a perfect world analyses what shortcoming has happened, and afterward
choose how to manage it. The issue of distinguishing a fault, finding the source/area and

Sayı 7, 2016 GiDB|DERGi