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A comparison of methods of identifying operating condition for ship roll stabilization control

Engeln A-Z. E., Koshkouei A. J., Burnham K. J., Roberts G. N.

Systems Science

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2005

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Vol. 31, no 1

63-72

EN

Ship roll stabilisation may be improved by utilizing a bank of parallel controllers in which individual controllers are activated in pairs for roll control via actuation of rudder and tins. To achieve this, it is necessary to identify the ship's operating condition, thus facilitating the activation of the appropriate controller pair. Operating conditions depend mainly on ship speed and wave encounter angle and, whereas only the ship speed is known to the system, the other conditions need to be identified. An approach has been designed to detect the actual seagoing condition via roll frequency detection. Two different methods are illustrated and discussed in this work.

2

A comparison of control systems for ship roll stabilisation

Law Y., Koshkouei A. J., Burnham K. J.

Systems Science

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2005

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Vol. 31, no 2

77-87

EN

This paper presents the results of a fin-rudder controller synthesis for roll reduction where different types of controllers are tested and compared. Three different main types of controllers including PID, advance phase, dual loop transfer recovery (LTR) and sliding mode (SMC) controllers are considered to stabilise the ship motion. The system comprises three different controllers, fin and rudder controllers, and autopilot. Therefore, for each situation of the ship journey, the triple controllers should be designed. It is not necessary to have the same controller structure for all three submodels. This paper compares these various controllers individually for each submodel, and demonstrates the results of the implementation of controllers with different structures when applied to the entire system.

3

A comparison method for identifying operating conditions for ship roll stabilization

Koshkouei A. J., Burnham K. J., Roberts G. N.

Systems Science

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2005

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Vol. 31, no 4

75-85

EN

Ship roll stabilisation may be improved by utilizing a set of parallel controllers in which individual controllers are activated in pairs for roll control via actuation of rudder and fins. To this end, it is necessary to identify the ship's operating conditions for facilitating the activation of the appropriate controller pair. Operating conditions depend mainly upon ship speed, wave height and wave encounter angle and, whereas only the ship speed is known to the system, the other conditions need to he identified. An approach has been designed to detect the actual seagoing condition via roll frequency detection. Two different methods are illustrated and discussed in this paper.

4

Adaptive sliding mode backstepping output tracking controllers for feedforward uncertain systems

Koshkouei A.J., Burnham K.J.

Systems Science

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2003

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Vol. 29, nr 1

79-96

EN

Methods for control design for nonlinear feedforward uncertain systems are considered in this paper. These systems are not usually transformable to the parametric semi-strict feedback form, and it may include unmatched uncertainties consisting of disturbances and unmodelled dynamics. The design methods are based upon (i) the backstepping approach, and (ii) a combination of sliding mode and backstepping. A comparison method of the dynamic and static backstepping methods is presented by applying two methods on a gravity-flow/pipeline system.