CAD/CAM UPDATE PIAS – SARC BV offer a full suite of options
www.sarc.nl sarc@sarc.nl
Scheepsbouwkundig Advies en Reken Centrum, SARC BV, Eikenlaan 3, 1406 PK, Bussum, The Netherlands. Tel: +31 35 69 15 024. Fax : +31 35 69 18 303.
O
F the software reviewed here, PIAS probably offers the greatest range of
analyses. There are a very large number of modules, and this allows the user to customise the software to his/her exact requirements. Prices quoted are for typical ‘professional’ and ‘entry-level’ packages, though even the ‘professional’ does not contain all the modules, as it is extremely unlikely that a single user would require them all. As well as stability analysis, there are modules available for resistance and powering. PIAS includes probabilistic damage analysis,
according to SOLAS 1992, SOLAS 2009 (HARDER harmonised method), IMO A265 & dr-67 (for hopper dredgers). Given the processing requirements for damage stability,
PIAS has the capability to read a Fairway surface model
the multi-threading capabilities in PIAS will make the most of computers with dual-core, hyper-threading processors (which effectively have four processors available); most other software runs in a single thread and so is only able to use one quarter of the available processing power of these computers. PIAS has the capability to read a Fairway (SARC’s line fairing and hull modelling
program) surface model. Otherwise, geometry can be defined as sections. PIAS can build up the geometry from multiple input files, which can be linearly scaled as required. SARC’s onboard hydrostatic system,
LOCOPIAS, loads model files created with PIAS directly for use onboard ship. Documentation is comprehensive and available in both Dutch and English.
Rhino Marine calculated direct from surface geometry
www.rhinomarine3d.com
information@rhinomarine3d.com Alion Science and Technology
Corp, Proteus Engineering Division, 345 Pier One Road, Suite 200, Stevensville,
MD 21666, USA.
Tel: +1-410-643-7496. Fax: +1-410-643-7535.
R
HINOMARINE is a plug-in to the modelling environment Rhinoceros,
meaning that it runs within Rhinoceros. Thus, any changes to the model geometry can be immediately assessed. RhinoMarine’s ancestry derives from FastShip, which has been in development for more than 20 years. RhinoMarine is unique in the
software tested, in that the hydrostatic properties are calculated directly from the surface geometry without the use of sections through the model. As has been discussed earlier in this review, the main advantages of this approach are that the hydrostatics are equally accurate for any vessel orientation and that complex geometries, such as foil- assisted multihulls and offshore platforms, are more accurately dealt with than by sectioning techniques. The drawback of the direct surface
integration is that interior surfaces and portions of surfaces inside a vessel’s watertight envelope need to be excluded from the calculations. Use of Rhino’s layering capabilities can greatly assist with selection of the correct surfaces for analysis. Because the calculations are performed on
RhinoMarine can provide hull and tank geometry in GHS-compatible format.
user-selected surfaces, tank volumes can be calculated by selection of the appropriate surfaces (calibration tables can be generated by calculating the tank volumes at the required soundings). RhinoMarine extracts all results to
Microsoft Excel and html (with customisable style sheets), facilitating post-processing and report generation. RhinoMarine should be considered to be complementary to some of the more costly software reviewed in this article, though for some users it may provide sufficient analysis capability on its own. It is essentially an intact stability tool for quick and accurate evaluation of a vessel’s hydrostatics during initial design. Its surface integration method will be attractive to users dealing with complex geometries and/or large angles of trim. Some features, such as cross-curves and
bonjean curves, are not available directly, though the data can be extracted if required. However, it is arguable whether this type of data is relevant to intact stability analysis since it is just as simple to calculate an accurate GZ curve, taking into account the actual displacement, centre of gravity, and full 3D rotation of the vessel. RhinoMarine is able to provide the hull
and tank geometry in GHS-compatible format. Using the GHS or Hydromax COM interfaces, it is even possible to drive GHS or Hydromax from within Rhino. The capability to evaluate stability criteria
is under development and expected in version 4. Online help is comprehensive.
72 THE NAVAL ARCHITECT FEBRUARY 2007
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