For the option: | Do the following: |
|---|---|
Category | Set to Contacts. |
Model | Enter the name of the model associated with the settings. |
Geometry Library | Select the geometry library to be used for contact operations: ■Parasolids - Specifies that the Parasolid geometry library to be used for three-dimensional contact determination. Adams Solver (FORTRAN) supports Parasolid version 35. ■Default_Library - Specifies that the default geometry library to be used for three-dimensional contact determination. The default library is based on RAPID, a polygon-based interference detection package developed at the University of North Carolina. Currently, Adams Solver supports RAPID version 2.01. For many models, the Default Library can substantially reduce simulation time. Because it is polygon-based, however, it is not always as accurate as the Parasolids geometry engine. Parasolids is an exact boundary-representation geometric modeler, which makes it highly accurate, but not as fast as a polygon-based engine. For these reasons, you can switch from one to the other depending on your needs. |
Faceting Tolerances | Specify the faceting tolerances when you select the Default_Library as the geometry library (see above). Faceting is the process of approximating the surface of an object by a mesh of triangles. All polygon-based geometry engines used faceted representations of surfaces. The default value Faceting Tolerances is 300.0028. Increasing this value will result in a finer mesh of triangles, which gives a more accurate representation of surfaces which are curved. Increasing the tolerance, however, also increases the memory requirements of the geometry engine and adds to the computational overhead, which makes it run slower. Setting the faceting tolerance to values greater than 1000 is not recommended. Values smaller than 300.0028 will give negligible performance improvements. The faceting tolerance has no effect on inherently polygonal surfaces such as boxes. |