A New Theoretical Dynamic Analysis of Ship Rolling Motion Considering Navigational Parameters, Loading Conditions and Sea State Conditions

Despite the IMO’s efforts and the large quantity of research carried out over the years
concerning the sudden loss of stability in fishing vessels, and even the damage done to merchant
fleets due to cargo shifting, accidents with very relevant consequences continue to occur. This paper
can be considered as a continuation of the recent research of authors which was carried out with ships
in static conditions, with pure beam seas and without resistance. The aim of the present research is to
provide a reference for ships’ operators to improve the ship’s behavior and seakeeping, to alter the
ship’s loading conditions or the navigational parameters (heading and speed), and even be aware of
the time available to carry out these modifications before reaching dangerous situations. For this, all
sea state conditions were mathematically modelled for, including the ship’s rolling motion both in
static and in realistic and dynamic conditions, with the waves influencing the vessel by coming from
any direction. Relevant results of easy comprehension for ships’ operators are shown in each of the
models, which were validated with a representative real case study.