Simulation model for an LNG ferry
Developing regulations for improving safety at sea has been a concern since in-
ternational trading became a reality. The International Maritime Organization
(IMO) has become the international adopted treaty, which regulates the manoeu-
vring performance of ships to maintain the safety, security and to prevent marine
pollution at sea. Manoeuvring tests for evaluating the performance of vessels have
been established to ensure this.
Early estimations of the manoeuvring performance is an essential part and sim-
ulation models are therefore a critical tool, as alterations to the vessel can be of
large costs after the vessel is built. Alterations and modiﬁcations can be made in
an early design stage with a good simulation model, avoiding such great costs.
A set of full-scale trial data has been provided and processed for comparison with
the simulated manoeuvres. The results show that the IMO standard manoeuvres
are within the required abilities set for each speciﬁc full-scale manoeuvre.
The simulation of the manoeuvres were carried out using the simulation model
VeSim. VeSim uses two pre-processors to calculate the motions and hydrodynamic
characteristics of the vessel. All the IMO standard manoeuvres were well within
the requirements. The comparison between the full-scale trials and simulated ma-
noeuvres give a clear indication of over- and underestimation of the simulated
manoeuvres in the range of 20 − 50% as an average value. This is mainly caused
by questionable results of the hydrodynamic characteristics.
VeSim is believed to be a satisfying simulation model regarding the results pre-
sented in this thesis. But with regard to the aberrations in the hydrodynamic
calculations, the model should be studied in more detail before making a conclu-
sive decision on whether or not to use VeSim as a validated simulation model.
Place, publisher, year, edition, pages
Institutt for marin teknikk , 2014. , 143 p.
IdentifiersURN: urn:nbn:no:ntnu:diva-25808Local ID: ntnudaim:11185OAI: oai:DiVA.org:ntnu-25808DiVA: diva2:740992
Berg, Tor Einar, Professor II