Minimum hardware required: PI 200, (64 Mb for Win NT)
Operating system(s): Windows NT, 2000, XP
Most recent version date & number: 2003, 3.09
Number of installations:


ShipmoPC applies an evolved version of strip theory in a particularly efficient way to calculate the ship motions response amplitude operators in 6 degrees of freedom. ShipmoPC has been validated for Froude numbers as high as 0.42 . Other features include keel immersion and slamming, and deck wetness probability prediction.

Several wave types and sea spectra are supported, with user-defined height, length and direction. Industry standard interfaces allow ShipmoPC to be used in conjunction with any hull design software.

Its intuitive user interface and comprehensive supporting documentation make ShipmoPC easy to use even by ? ShipmoPC Seakeeping Prediction Software

ShipmoPC is a derivation of the SHIPMO seakeeping predictions code developed by the Canadian Defence Research Establishment Atlantic (DREA). Specifically, ShipmoPC incorporates the core computer code from the SHIPMO4 version.

ShipmoPC is a strip-theory based frequency domain seakeeping code capable of computing the six degree-of-freedom motions of a monohull with forward speeds in regular as well as irregular seas of arbitrary headings. Response Amplitude Operators (RAO's) for the longitudinal (heave, pitch and roll) and the lateral (sway, roll and yaw) motions are derived for the complete range of frequencies using the hull geometry input for the specified speeds and headings. Also included are load components - shear forces, bending moments and torsion. The ship dynamics model of ShipmoPC is capable of accounting for the hydrodynamic effects from rudders, bilge keels and other appendages as well as tank roll stabilizers. Autopilot routines are built in that allow rudder roll stabilization to be modelled.

The most significant development of the new version is the addition of a load calculation module that has been developed and extensively validated at DREA through sea trials and model tests. The predicted load components involve vertical, lateral and torsional shear forces and bending moments.

Motions in an irregular seaway may be calculated either by specifying a theoretical spectrum or by a set of measured spectral ordinates input by the user. The theoretical spectral formulations built into the code are quadratic regression spectrum and Bretschneider spectrum. Both unidirectional and short-crested seas can be specified, the latter being represented by cosine-squared spreading. Computed results such as RAOs (amplitudes and phases) and the significant (single amplitude) motions in all the six modes are generated. For the specified locations on the hull, computed output includes parameters such as accelerations, probability and frequency of incidence of deck wetness, keel emergence and slamming, as well as slam pressures and forces. In addition, an index showing human tolerance to vertical motions is also provided. The program will produce habitability indices such as Motion-induced interruptions (MIIs).

ShipmoPC has been validated against a large number of ships ranging from coastal defence vessels to cargo ships as well as barges, icebreakers and naval ships. ShipmoPC, the commercial version of SHIPMO4, was developed by Fleet Technology Limited for its software subsidiary, Sable Maritime Limited.

In order to predict the motions accurately, it is necessary to ensure that the hydrostatics parameters are correct. The hydrostatics may therefore be run independently, allowing the user to assure correctness before proceeding with the hydrodynamic computations.

ShipmoPC results are both tabular and graphical. The user will typically select to view RAOs (six degrees of freedom) or RMS motions for various ship speeds, headings and sea states.

  Capabilities & New features

Powerful new calculation features and Enhanced interface

  • Load predictions for load RAO's in regular waves and RMS loads in irregular seaways, including vertical, lateral and torsional shear forces and bending moments.
  • Calculation of the hydrodynamic coefficients with an improved boundary element method that is free at irregular frequencies.
  • Easy handling of complicated hull forms such as sectional profiles with bulbous bow, and others.
  • Consistency checking at each input dialogue, greatly reducing unexpected errors in computing.
  • Conversion of input data from previous versions.

ShipmoPC has been validated against a broad type and number of ships from coastal defence vessels to barges, icebreakers and naval ships. ShipmoPC offers a user-friednly interface with enhanced plotting capability and report quality output.A comprehensive User Manual is included.

BMT Fleet Technology Limited provides both technical support for ShipmoPC as well as extensive marine consulting services.

With a 29 year history of providing professional engineering services to the marine community, BMT Fleet Technology Limited offers support in hydrodynamic analysis, full scale sea trials and model test coordination.

ShipmoPC will run on any system configured to run Microsoft WINDOWSTM 9x, and WINDOWS NT (v.4.0 Service Pack 2 or greater) and WINDOWS 2000.

Link to BMT Fleet Technology Ltd.

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