MMC engineers often use computer programs based on “strip theory” to analyze the response of a displacement ship or barge to sea conditions These programs calculate the hydrostatic and hydrodynamic response of individual transverse strips of the ship to waves. By integrating the sectional responses an accurate picture of the response of the entire vessel can be created.
This program suite can be used to predict motions and stress conditions on ships. Derived from the US Navy's SMP (Ship Motion Program), VisualSMP is a direct result of more than 30 years of US Navy's research.
VisualSMP calculates 6-DOF rigid body motions, absolute motions of any specified points and the relative motions of specified points relative to waves in both regular and irregular waves. This program suite is useful for evaluating ship motion reduction measures such as bilge keels, rudders, fixed fins, controllable fins/rudders, moving weights and various anti-roll tanks. Irregular seas are modeled using either the two parameter Bretschneider, the three parameter Jonswap, or the six parameter Ochi-Hubble wave spectral models. Motion outputs include displacements, velocities and accelerations. Load outputs include vertical and transverse shear forces, longitudinal and horizontal moments, and torsion moments at user's specified locations. VisualSMP will calculate the probabilities and frequencies of submergence, emergence, and/or slamming occurrence, slamming pressure/force, MSI (motion sickness incidence) and MII (motion induced interruptions, i.e., tipping and sliding) for various locations on the ship.