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2 TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2 2009

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The H2 and Robust Hinf Regulators Applied to Multivariable Ship Steering

Gierusz W.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2009

Vol. 3, no. 4

431--440

The main goal of this task was a calculation of the two multivariable regulators for precise steering of a real, floating, training ship. The first one minimized the H2 norm of the closed-loop system. The second one was related to the Hinf norm. The robust control approach was applied in this controller with the usage of the structured singular value concept. Both controllers are described in the first part of the paper. Details of the training vessel and its simulation model then are presented. The state model of the control object obtained via identification process is described in the next section. This model with matrices weighting functions was the base for creation of ’the augmented state model’ for the open-loop system. The calculation results of the multivariable controllers is also shown in this section. Several simulations were performed in order to verify the control quality of both regulators. Exemplary results are presented at the end of this paper together with final remarks.

Risk Analysis and Human Factor in Prevention of CRG Casualties

Kobylinski L.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2009

Vol. 3, no. 4

443--448

CRG casualties create one of the major type casualties in shipping. Prevention of CRG casualties is an important issue, especially because of the number of CRG casualties has increased almost twice during recent years. For the great majority of all CRG casualties human factor responsible, and the increasing number of these casualties might be attributed to poorer qualifications of ship masters who have not enough experience in handling very large ships put into operation presently. Risk analysis is a modern method for assessment of safety level of technical systems. This tool may be the used to investigate causes of casualties and to find out most effective prevention measures. Risk analysis is widely used in many areas; in case of marine technology it is used routinely in off-shore technology. The author investigates possibilities to apply risk analysis in the area of ship handling with the focus on human factor. This is preliminary study where possible methodology for hazards identification and risk assessment in respect of CRG casualties are investigated and risk control options are suggested. Various aspects of the influence of human factor in collision avoidance are listed and in particular the effect of training is stressed.