12.5. Notes on Usage and Current Limitations

The following are known limitations of the Drop Test Wizard and the features it uses:

  • With the exception of the Part Transform object, there is no synchronization of data between objects in the project tree and the Drop Test Wizard when the wizard is open. Therefore, if you modify the Drop Height or the rotation angle in the Collision Point coordinate system, these changes will not be reflected in the wizard unless the wizard is restarted.

  • The Drop Test Wizard can only be used for a 3D analysis.

  • You cannot use an implicit system to pre-stress the geometry when using the Drop Test Wizard.

  • When a geometry object is added in Mechanical using the Construction Geometry object, the entire mesh present in the analysis system will be cleared and the mesh will have to be generated again.

  • Mesh penetration is only tested at the end of the wizard execution. It will not be tested if you modify the Part Transform angles or if you regenerate the mesh.

  • Note that when the dropped geometry orientation is modified by updating the fields in the Part Transform object rather than using the Drop Test Wizard, the analysis end time will not be updated, and mesh penetrations will not be checked.

  • If you modify the geometry after having run the Drop Test Wizard, only the original geometry will be scoped to the Part Transform object. You will need to manually scope any new geometry to the Part Transform object for it to be rotated by any subsequent runs of the Drop Test Wizard.

  • At release 2020 R1, the Rotate Geometry object is no longer supported and the rotation of the geometry is achieved using a Part Transform object. For projects created using the Drop Test Wizard in versions 2019 R3 or earlier that are loaded into the current version, the Rotate Geometry object will still remain in the project but will be in a read-only state. The Rotate Geometry object can be converted to a Part Transform object by launching the Drop Test Wizard.

  • The Drop Test Wizard is not available on Linux. The Drop Height initial condition may be added manually to an analysis on Linux.

  • If you modify the thickness of any Surface Bodies after the wizard has been run, there is no check to ensure that the change in thickness has resulted in any penetrations of the geometry with the Drop Test Ground Plane.

  • You are advised not to rename any of the objects created by the Drop Test Wizard as any subsequent runs of the Drop Test Wizard may result in undesired behavior.

  • If you have multiple Explicit Dynamics systems in one project that share the Model cell, then the Drop Test Wizard can only be used on the first Explicit Dynamics system that appears in the project tree in Mechanical.

  • The Drop Test Wizard can only be run on projects in Mechanical where the Mesh is editable. This means that the Drop Test Wizard cannot be run on geometries with composite shell layups defined in ACP because for such geometries the Mesh is Read Only.

  • The Drop Test Wizard should not be run when construction geometries form part of the user geometry. In such cases, the construction geometry parts will not rotate with the remaining user geometry.