Numéro : 1995 - Year : 1985
Simulations in real and accelerated time - A computer study of a Ro/Ro vessel entering different port configurations
Peter OTTOSSON, Research Engineer, Project Manager
Willem B van BEHLEKOM, Research Director
SSPA Maritime Consulting AB, Sweden
M/S Sigyn is a 90 m long ro-ro ship designed for the transport of the spent fuel from the Swedish nuclear plants to France.
When M/S Sigyn entered the port of Barseback (in the south of Sweden) for the first time, she grounded in the 60 m wide entering channel. A commission of inquiry was appointed to investigate the casualty. As the vessel is rather unconventional with the bridge at the bow and with specific manoeuvring properties the commission recommended the owners to have the pi lots and masters trained in a manoeuvring simulator. SSPA was asked to carry out this training and to investigate carefully the manoeuvring properties of MIS Sign.
The paper presents the work and the results of this investigation, which consists of simulations in real time and accelerated time. The real-time simulations were carried out in SSPA Manoeuvring simulator with participation of Swedish pi lots and two French masters. On the basis of these simulations a control algorithm, covering all steering signals, was derived to represent human behaviour when handling the ship. The parameters in the steering algorithm were varied in a stochastic way and a great number of predicted entrances and departures in alternative as well as in existing harbour configurations were carried out.
The simulations were carried out efficiently by the use of the computer program SIMNON, which is an interactive simulation program for dynamic systems governed by ordinary differential and difference equations.
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