Powering

A range of methods based on widely-employed standard regression analysis methods can be used to estimate powering for single- and twin-screw vessels.
Functions include:

• Propeller optimisation
• Resistance calculations
• Ship powering characteristics
• Use of resistance ratios from model tests

Manoeuvring

Manoeuvring characteristics can be assessed in deep or shallow water, under even keel or trimmed conditions. This analysis can rapidly estimate the effect of changes in ship conditions, and takes into account nonlinear coupling between hull forces and rudder moments.
Analyses include:

• Crash stop calculation
• Zig-zag manoeuvre
• Turning manoeuvre
• Reverse spiral calculation

Seakeeping

Seakeeping uses standard strip theory. Added mass and damping coefficients are combined with wave excitation forces to calculate the vessel's responses in regular and irregular seas. Combined responses at any location along the vessel may be calculated to provide subjective motions, deck wetness, propeller emergence and slamming. Functions include:

• Sectional hydrodynamic coefficients
• Regular wave responses (RAOs)
• Added resistance due to waves and dynamic loads
• Short-term, irregular vessel responses (RMSs)
• Long-term seakeeping performance predictions

Dynamic Positioning

Dynamic Positioning allows the design of a the thruster system for any vessel which requires a station-keeping capability with three or more thrust units. Functions include:

• Thruster requirements for a given environment
• Environment calculation, including a rosette of holding capability
• Environmental Regularity Number (ERN) calculation

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