The Analysis menu can be used to change the current analysis mode. It also contains commands to set the input data and analysis settings and environment options required for the current analysis.
Note:
It is good practice when preparing to run analysis to work down the Analysis menu starting at the top and checking all of the settings and environment options.
Selecting Heel allows you to specify the three ranges of heel angles that you wish Hydromax to step through. Separate ranges are used for Large Angle Stability, KN and Limiting KG analyses.
Allows the specification of the trimming mode to be used for the analysis. This can be fixed trim; free-to-trim to loadcase; free-to-trim specifying initial trim value and free-to-trim specifying LCG position.
The range of drafts used for the analysis of upright hydrostatics can be set using this command. KG for the upright hydrostatics is also specified in this dialog.
The range of displacements used for the analysis of KN values, Limiting KG and Floodable Length can be set using this command. The vertical centre of gravity to be used for KN and Floodable Length analyses is specified here.
Allows you to specify Heel, Trim, CG, Displacement and Draft for the Specified Condition analysis.
The range of permeabilities used for the Floodable Length analysis are set using this command.
Allows you to specify whether to use Corrected VCG method or Simulate Fluid Movement method when treating the fluid contained in slack tanks.
Also see:
Free surface correction on page 40.
This command allows you to set the density of fluids used in the analysis. See Density on page 101.
The Waveform command allows you to perform analysis for a flat waterplane or sinusoidal or trochoidal waveforms.
Allows you to define the amount of hog or sag to be applied to the hull when calculating the vessel’s hydrostatics.
The criteria menu item will bring up the criteria dialog.
This allows you to specify which criteria will be checked during the analysis.
See Criteria
on page 114.
When the floodable length analysis is selected, the criteria command will bring up a Floodable Length Criteria dialog with criteria that only apply to floodable length analysis.
Specifies grounding on one or two points of variable length for use with the Equilibrium and Longitudinal Strength analyses.
Checks for changed tanks and makes sure that any tanks and compartments that have not been formed are correctly calculated. It then updates the loadcase with the correct capacities and free surface moments for the tanks. Also recalculates totals and sub-subtotals after a row sorting or moving command.
Also see:
Forces all tanks and compartments to be re-formed from their initial definition. This command also updates the loadcase.
If any of the tank boundaries are made up from boundary surfaces, it is better to use “Recalculate Hull Sections” after re-opening the Maxsurf model to make sure the latest internal structure surfaces are being used as well.
Deletes all existing hull, tank and compartment sections and recalculates them from the hull surface data and compartment definition. This is particularly useful if the underlying Maxsurf model has been modified, if you wish to recalculate at a different precision, or if you wish to modify whether skin thickness or trimming options are applied.
Note:
To be able to update the Hydromax model to changes made in Maxsurf see Updating the Hydromax Model on page 25 for a step-by-step procedure you can follow.
Project all of the margin line points horizontally onto the hull surface, ensuring that the margin line follows the hull shape precisely.
Also see:
Margin Line Points on page 62.
Choose the analysis type you wish to use from the sub-menu.
Selecting Start Analysis causes Hydromax to start performing the specified analysis. The analysis may be halted at any time by choosing Stop Analysis from this menu, also.
If you have halted analysis by choosing Stop Analysis, Resume Analysis may be used to restart the calculation from the point where it was interrupted.
This command halts the analysis at the current iteration. Note that the analysis may not have been completed and in the case of large angle stability, equilibrium condition and KN values, any data displayed for the final iteration may be incorrect.
Hydromax will run the selected analyses for all combinations of load and damage cases using the batch processing command. Results are written to a tab delimited text file as specified by the user at the start of the analysis.