More elaborate voyage-specific seakeeping analyses can be carried out
when time series of waves are available. Using spectral data instead
of derived wave parameters such as significant wave height, mean
direction or zero-upcrossing period, ensures more accurate results,
especially in multi-directional seas. Moreover, persistency effects
are automatically included.
Using "W3C" voyage simulations can be carried out by using the Argoss
w3c-database (www.argoss.nl). This historical world-wide wave database
is the product of satellite observations and a 3rd generation wave model.
It covers a period of 15 years with a time resolution of 3 hours. The
wave condition at a particular date, time and location is described by
a distribution of the energy, the direction and the directionality, as
a function of the frequency. The position list of an indicative voyage
can be used as input for voyage simulations. The simulations are carried
out for different dates and time of departure, and repeated until
convergence is obtained after 'N' simulations.
|