FormSys is a software development company specialising in 3D software for design, analysis and construction. Specialist areas of application include naval architecture and shipbuilding, and structural engineering. One of the drivers for our software development process is to keep pace with the ever changing portfolio of design rules applicable to the wide range of vessels that are designed using Maxsurf each year. In the version 15 release our focus has been on the new probabilistic methods for assessing damage stability. To this end we have added a new version of Hydromax to our Maxsurf suite. Hydromax Ultimate is the most capable version of that module and includes all of the capabilities of Hydromax Pro, plus the new probabilistic damage stability functions. Hydromax Ultimate is available for purchase by existing Hydromax owners by paying the difference in price between the two versions. As well as adding Hydromax Ultimate, we have also upgraded many of the Maxsurf modules with new capabilities. The details of those changes follow below. All members of the Maxsurf subscription program will be sent Maxsurf version 15 over the coming weeks. Contact your local distributor or FormSys directly for a price quotation to add Hydromax Ultimate to your suite of software. It is useful to illustrate how it is envisaged that a user would use Hydromax to perform a probabilistic damage analysis: 1. The vessel is modelled in Maxsurf and tank and compartment definition is performed in Hydromax as usual. 2. The user defines other ship data required for the probabilistic damage analysis. This data includes the vessel type, which load cases to consider, and the number of adjacent damage zones to consider. 3. The user defines the boundaries of the damage zones 4. Longitudinal bulkhead and deck locations are defined for each zone and groups of adjacent zones. 5. Once steps 2 and 3 have been completed, the p-factors are automatically calculated and displayed as the zone data is modified. With the bulkheads and decks defined in step 4, the r- and v-factors are also calculated. 6. When the zones have been defined the user can then define which tanks are damaged in each zone and sub-zone. A first pass at this can be automatically generated using the Extent of Damage command which automatically detects which compartments would be breached by the corresponding damage (sub) zone. 7. The user can then perform a probabilistic damage analysis. Hydromax runs a large angle stability analysis for each combination of loadcase and damage and collates the results to calculate the attained index. This index (A) is then compared with the required index R to determine a pass or fail.


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