FAQ

GENERAL FAQs

1. What are the recommended graphics card settings?

The recommend settings in the View Options dialog are: Rendering Options: Hardware Z-buffer Video Driver: OpenGL Driver Driver Options: Double Buffering

2. If the MAESTRO auto-recovery functionality fails, can I still try to recover my model?

Open the location where the original model was saved. You will see a filename.mdl and filename.bck. Change the filename of the .bck file and change its extension to .mdl. Now open the newly named .mdl file; this is your recovered modeler file.

3. Why aren’t MAESTRO folders removed from Start > All Programs when MAESTRO is uninstalled?

This is due to the autosave files that are added to the directory. These folders and menu items can be manually deleted after the uninstall process.

Pre-Processing & Modeling FAQs

1. How do the stiffeners in a stiffener layout differ from a beam element?

Stiffeners are defined as beam elements, but they are not actual finite elements in a coarse mesh model. Instead, they are treated as additional stiffness in the defined direction for the panel element they are defined on, thus converting the material to orthotropic. In a coarse mesh model, all stiffeners are treated as “internal” regardless of their defined location. The number of stiffeners, whether defined as internal or edge, is the key to how the mechanical properties of the panel element are changed. However, the location is relevant when creating a fine mesh model from the coarse mesh model. At this point, an actual beam element will be created representing the properties of the stiffener at the defined location.

2. When two end points coincide at the reference or opposite end, is there a difference between using a strake triangle or an additional triangle element?

No, in the case of a strake element with coinciding reference of opposite end points, the triangular element is degenerated to a simple triangle.

3. Do I need to define the “second strake” for girders when running the sparse solver?

No. The second strake is used to identify the girder’s effective breadth for the hybrid beam formulation in the scalable solver.

4. How is the additional stiffness treated when a quad or strake has a stiffener layout?

The axial and bending stiffness of the stiffener(s) defined on that plate element are “smeared” into the panel’s property. If an edge stiffener is defined, MAESTRO adds the axial and bending stiffness of the whole stiffener to the panel on which the stiffener is defined.

5. Can I sort the plate and beam properties in the strake definition dialog or the additional elements dialogs?

Yes, element properties can be sorted in the properties dialog by name, thickness, etc.

6. How is a model balanced in MAESTRO? How does this compare to Orca3D, for example?

MAESTRO is a force based balance. The equivalent forces are calculated for each panel element. Orca3D however uses a volume/buoyancy based balance.

7. Can I hide particular substructures and modules?

Using a right-mouse-click on a particular Part (via the Parts Tree), the user has the ability to make particular parts visible or invisible. This works well when you are turning the visibility of a few parts off, but a little inconvenient when turning many parts off. When you are interested in turning the visibility off/on of many parts (substructures or modules), use the Visibility List command, which allows you to toggle the visibility on/off of Parts quickly.

  • Right-click on any part in the Parts Tree
  • Choose Visibility List, which opens a separate Parts Tree list
  • Left-click on a part to toggle the visibility on or off.

This is especially useful when the model becomes sufficiently large and many parts exist.

8. How do I model an I-beam element?

MAESTRO can create an equivalent I-beam element by adding a second flange to an existing T-beam element. This second flange is defined in the Beams tab of the Finite Elements dialog, the Beam tab of the Compounds dialog, or a “second flange” strake can be created. The second flange is defined by a width and thickness. Please see the Second Flange section of the MAESTRO Manual under Verification and Validation for further demonstration of this.

9. How do I reset zCF?

  • Navigate to the balance tab in the load dialog
  • Click “Specify” under the Center of Flotation section.
  • In the Define Floating Center dialog, select “Do not Change Wave Emergence”.
  • Change the CF Structure Coord and Click OK.
  • On the balance tab, set Center of Floatation back to “Default” and click Modify.

10. Can I modify the property of more than one element at a time?

Yes. You can create a general group of all the elements desired and modify the entire group’s element’s properties at once. For example, if you would like to change the hull thickness you can create a general group of all the hull plate elements. Right-click on the group in the groups tree and select Modify. In the Properties dialog that opens, select a new plate property from the drop-down list to change all plate elements to this property.

Post-Processing FAQs

1. With respect to stiffener tripping calculations, are the stiffeners defined in the stiffener layouts taken to be normal to the strake?

Yes, MAESTRO’s stiffeners are normal to the plate.

2. How does Yield Stress (as defined in the Materials dialog) affect the analysis?

Yield stress only affects the analysis when using the limit state analysis.

3. What is the “Master Elements” option used for in the View Options dialog?

Master elements are the parent elements of fine mesh elements. This can be used when a user wants to view the fine mesh results in the context of the global model by clicking View > All Modules. Turning “off” Master Elements allows the fine mesh elements to be more clearly seen.

4. When performing a natural frequency analysis, how do you view the participation factors and what do they indicate?

A summary of the analysis can be seen in the output tab at the bottom of the screen. “ACU-%” is the accumulated modal participation factor. Modal effective mass and participation factor are relative measurement to the total vibration. For example, if the “ACU-%” is 99% in the first five modes, it implies the first five modes are dominant modes, and the rest of the modes can often be ignored. Modal effective mass and participation factors are often used in constraint vibration such as Dynamic Design Analysis Method (DDAM).

5. How do I eliminate local distortion of boundary modules when applying end moments?

End moments applied in MAESTRO are simply a combination of end nodal forces that collectively sum to the user defined moments. Unless additional local structure, for example a transverse bulkhead, is applied, we would expect to see local deformation.

6. How do I copy the data from the MAESTRO grid into a program such as Microsoft Excel?

  • Right-click inside the grid and select “Change to Fixed Rows.”
  • Change fixed row number from 1 to 0.
  • Highlight the desired data and right-click and select Copy.
  • Paste the data into the desired program.

Licensing & Security FAQs

1. How do I transfer my license to another computer?

MAESTRO licenses can be easily transferred between computers with the USB security device. Before plugging the security device into the new computer, verify that MAESTRO has been installed. After this, the security device can be plugged into the new computer and MAESTRO can be launched. Security drivers and network servers are integrated into the MAESTRO installation process. Therefore, if MAESTRO version 9.0 or newer is installed, licenses can be moved between computers by simply moving the security device.

2. How do I renew my maintenance and support contract or add modules to my license?

To renew your maintenance and support contract, or to add additional modules to your license, please send an email to sales@orca3d.com with your contact information, license number and request for update or addition and you will receive a quote for these services.

3. I have installed MAESTRO 9.0 or newer; why doesn’t my Sentinel System Driver and Protection Server show in the Add/Remove Programs dialog box?

The Sentinel Driver and Protection Server are now part of the MAESTRO installation and therefore it is no longer a separate product.

4. Where can I get more information for troubleshooting issues with a Network lock?

Please see the ReadMe.pdf file located in the MAESTRO installation directory under System > Sentinel for more information regarding MAESTRO network locks.

5. How do I reprogram my hardware lock with new passwords?

To reprogram a lock, please execute the following steps:

  • Remove all other hardware locks from your computer. The MAESTRO hardware lock should be the only device attached to your computer for this operation.
  • Run the MAESTRO Fast Lock program from your MAESTRO program group.
  • Select: Edit/Set Passwords
  • Enter the new passwords and click OK
  • The new support date should be shown

Release Notes: VIEW