Starting Hydrostatics Workbench

Select File->Open command to open existing CATProduct Document with wrapping surface geometry. You can use Frigate.CATProduct from Samples folder.  Than Select Start->Equipment &Systems -> Hydro Static Analysis. The Hydro Static workbench is loaded with existing CATProduct document.

Creating Reference Element

The first necessary step is definition of Reference Elements. These elements are the forward and aft perpendiculars, midship section, design water line plane, wrapping surface list and margin line.Click Reference Elements Icon. The Reference Elements Definition dialog box appears. You have to select at least perpendiculars, midship and waterline plans and list of wrapping surface.

Note: the software expect you model comply following conditions:

• Perpendiculars and midship are parallel to yz-plane
• Waterline is parallel to xy-plane
• Midship plane have to pass throw Part origin

Define the load of the ship.

You can make modeling of load in three ways. If only the weight and center of gravity are known, you can create Explicit load case. If you have have weight distribution of ship along the ships length, you can create weight distribution load case. And at least, if you have some bounded zones already created, you can set some additional properties on the existing bounded zone and use this information for load case calculation.

The following sections will describe these possible load cases.

Creating Explicit Load Case

Explicit load case allows you define the weight of ship and here center of gravity. Click on Explicit Load case icon and fill the panel as shown.

Creating Weight Distribution Load Case

The Weight Distribution Load Case represents linear distribution of weight along the length of ship. Click on Weight Distribution Load Case and fill the panel as below. Alternately, you can import weight distribution from comma separated file, using dedicated button on the panel.

Creating Bounded Zone Load Case

First you need to enrich the existing Bonded zones with additional weights attributes. To do this, you have to open Bonded zone's Properties from the context menu and click More Button.

After while, you will see the HydroStatic tab as shown On this tab you can specify the bounded zone's mass and center of gravity or set up following attributes - density, volume permeability and etc. In last case, the weight of Bounded Zone will be calculated from these attributes and its volume.

Setting up weight properties on Bounded Zone, you can use multi selection, in that case all zones will have the same properties.

 When you finished with zone's properties, you can create the Bounded Zone Load Case.To do this click on dedicated command, select the Deadweight Load case(it have to be previewsly created, and it can be ether explicit or weight distribution load case) and select bounded zones you have previewsly enriched. The resulting load case will be computed from deadweight and summ of bounded zone.

HydroStatics analysis

Creating analysis

For given Reference Elements and Load Case, you can perform simple analysis such as floatation position of ship, logitudinal strength (shear forces and bending moments) and righting arms digram. Click on Analysis Icon, choose References Elements, Load Case and desired analysis.

Please Note: You are not be able to analyze the longitudinal strength if you select explicit load case.

After updating Analysis Set you can see the water surface representation and set of diagrams.

Note: Update process takes about 2-5 minutes. Please take a while.

Viewing Diagrams

Some hydrostatics analysis have diagrams, you can change graphic and scale properties for better visualization or generate HTML document to have hard copy. To do that use right click on diagram and use items Properties or Diagram name object->View Diagram(s) from context menu. When browser has started, you can save page to your location.

Floudable Lengths

Creating Floudable Lengths

Floudable Lengths feature will be created by Reference Elements Command, if you have specified the margin line. It contains three diagrams - Integral Volume Curve, Maximum Floudable Volume and Maximum Floudable Lengths.

Choosing position of bulkheads

Having Floudable Lengths feature, you can create planes for transverse bulkheads according to maximum floudable lengths. To do this, you need switch to CATPart document where new planes will be placed and start Next Bulkhead Command from Hydrostatics tollbar. Use View -> Toolbars menu to visualize the toolbar.

Select Floudable Lengths feature, origin plane, input Offset value and click on Preview Button. If Offset value is comply to the maximum floudable length you will see the preview of your new plan. If you don't see any preview, try to set smaller Offset value. You can use Offset value's spinner to adjust your plan position.

Application settings

In this section we will consider how to control the performance of you computation and manage the visualization of resulting diagrams. These parameters are control from Tools/Options/Equipment and Systems/SIC Hydro Static application settings page.

Performance Tab

Performance Tab allows you control automatic of manual update of features. This will give you option to choose when to make heavy computation, for example during the night.

For volumetric computation (such as intersecting surfaces, volume and cog computation) the product use tessellated CATIA geometry. This gives us the improvement in Performance and make negative impact on accuracy of calculations. The Sag parameter defines the maximum distance between a tessellating triangle and the tessellated surface. Manipulating with Sag value, user can make a choise between the time and accuracy of computation.

With Floudable Lengths Number of points option you can specify how many points should be used of Floudable Lengths Curve computation.

Diagrams Tab

On this page you can specify default values for Diagrams scale and graphic properties.