Shipsim is a general-purpose six degree-of-freedom wave-frequency
vessel motions program specifically enhanced for displacement-hull
vessels with relatively large block coefficients. Vessels in this
category include drillships, barges and tankers. Shipsim utilizes
an efficient algorithm for calculating wave-frequency forces and
moments which permits accurate modeling using as input only
gross hydrostatic and mass properties (metacentric heights, displacements,
overall dimensions, centers of gravity, gyradii, etc.), eliminating
the need for tedious and error-prone input of vessel lines details.
This typically permits comprehensive executions to be completed
in one hour or less. Non-linear effects, particularly in the roll
degree of freedom, are fully modeled, leading to realistic roll
response predictions which depend on details of bilge geometry.
A wide range of environmental conditions is accommodated, including
extensive built-in wave spectral types, azimuthal spreading of
wave directions and an optional independent background swell.
Accelerations, velocities and displacements at any point on the
vessel can be computed. Effects of finite water depth are fully
modeled and either English or metric units may be selected for
vessel specification and data output. Output is in the form of
amplitude and phase of vessel Response Amplitude Operators (RAOs)
and/or statistical characterizations of vessel response to irregular
wave conditions. Execution is carried out in the frequency domain,
resulting in short run times and unambiguous predictions
of statistical response values.
Want to know a little more? Download an expanded description, complete with sample input/output pages.
Want to know a lot more? Download the User Manual (pdf)
Want to see the Data Editor Interface?