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ShipmoPC - FAQ's

Frequently Asked Questions about ShipmoPC are answered here

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Rob Teasdale

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ShipmoPC - FAQ's

What hardware is required to run ShipmoPC?

ShipmoPC will run on any system configured to run Microsoft Windows XP, Vista, 7(both 32 and 64 bit) 

Does ShipmoPC require the use of a "dongle" security device?

Our software does use hardware protection.  ShipmoPC and other selected BMT Fleet Technology Ltd software products use a USB hardware lock that permits greater flexibility including the leasing of our software and allows ShipmoPC to be available on a network. 

What documentation comes with a purchase of ShipmoPC?

ShipmoPC is shipped with a pdf user manual on the installation disk.  The software also includes online help.

For what types of ships is ShipmoPC valid?

ShipmoPC can be used for monohull ships of all sizes. Because the program is based on linear strip theory, the accuracy of motions predictions will tend to decrease for ships having a length-to-beam ratio of less than four (4). ShipmoPC has been validated against a large number of ships ranging from coastal defense vessels to cargo ships, barges, icebreakers and naval ships.

Is the program valid for low and/or zero forward speeds?

Yes. ShipmoPC motions predictions are valid for Froude numbers ranging from 0 to 0.35. For Fr > 0.35, predictions are expected to be less accurate.

Is the program based on strip theory or 3D diffraction?

ShipmoPC is a strip theory-based, frequency domain seakeeping code capable of computing the six degrees-of-freedom motions of a monohull with forward speeds in regular as well as irregular seas of arbitrary headings.

How is the ship hull defined?

ShipmoPC permits the user to define the hull in one of two ways; by defining the hull offsets or by defining the sectional area curve. If the former method is selected, the user can view the shape of each station (from keel to deck edge) as the offset points are entered. In the latter case, once the hull sectional areas are defined, ShipmoPC generates offsets using either Lewis Forms or M.I.T. Forms. The locations of the stations are also graphically indexed using a hull profile.

Can I produce Polar Plots of my results?

Yes. ShipmoPC can generate speed-referenced polar plots of any of the motion response parameters. The program also produces formatted text output and X-Y plots of results.

Is it possible to model the influence of bilge keels, roll fins and passive roll stabilization?

ShipmoPC permits the user to specify any combination of the following appendages: bilge keels, skegs, fin stabilizers, anti-rolling tanks (controlled passive or purely passive), propeller shaft brackets and rudders.  The user may also specify the use of an autopilot for use with rudder roll stabilization. All of these features are accounted for in the prediction of motions.

Does ShipmoPC include Motion Sickness Index?

Yes.  The user will be able to select either the Colwell or the Bureau Veritas MSI on the Seakeeping form.  Once MSI has been selected, exposure time in hours will need to be specified.

How are speed and heading dependent data included in the program?

The user will create a comma delimited file (csv) for speed and heading dependent data.  Either on the Rudder or Roll Fin page, the user will provide the path to the csv file to include these in the calculations.

How detailed are offset pairs for each station?

A user can define up to 60 offset pairs for each station.  These offsets may also be imported from a comma delimited file (csv) on the geometry page.  Each segment of the defined station can be checked to improve the integrity of the calculations.

Does ShipmoPC use Lewis Forms or Boundary Element method? Is it possible to specify some Lewis and some Boundary Element sections?

ShipmoPC allows the user to choose either the Boundary Element method or the Lewis Forms (a.k.a. conformal mapping) Method to determine the hydrodynamic properties of the hull. We do not offer the option to specify a mix of Boundary Element and Lewis Forms methods. 

How is the wave data defined?

The wave data can be defined using standard Wave Spectra, such as Bretschneider, JONSWAP, six-parameter or ten-parameter spectra. Alternatively, the user can specify an external file defining the wave spectrum.

Can I produce response predictions for local areas away from the C.G.?

Yes. ShipmoPC calculates motions, speed, and accelerations for local positions, including off-centerline points. The program also will predict frequencies of deck wetness, keel emergence, and slamming.  Finally, the program will produce habitability indices such as motion-induced interruptions (MIIs).

Are there special prices for certified educational institutions?

Yes, we offer a special price schedule for educational institutions. The discount is currently 50%.  Please inquire for details.

Is training required in order to use this software?

It is our experience that with the guidance of the user manual, the directions in the program interface are comprehensive enough that a new user with a naval architecture or marine background can operate the program with relative ease. Training sessions for user groups can be organized by special arrangement.

What technical support will I receive with ShipmoPC?

User support is provided for the first year free, up to 5 (five) hours of assistance. Thereafter, technical support is charged at the current hourly rate or a package of one year of maintenance and upgrade support may be purchased on an annual basis for $1500.

Is a demonstration version available?

Yes, if you haven't received one with this package, contact us to receive a demonstration version of ShipmoPC at no charge, or download it from our website.