salome/aster measurement units

Hello,

The system of unit is the choice of the user BUT the chosen units have to be consistent with the system of standard SI units (this does not mean that the units HAVE to be SI, but it must be consistent).

For example, in the tutorials of Paul Carrico there is a very good list of consistent units ( www.caelinux.org/wiki/downloads/docs/PCa..._cyclique/index.html )

I have also attached a PDF file with the definition of units (taken from Paul Carrico's document):

OK,

to check in which units your model has been built or imported, you should:
1) know its actual dimensions (source CAD, 2D draft, datasheet...)
2) use the "Bounding Box" tool of Salome/GEOM module to check if the size of your geometry is consistent with your actual object dimensions and to know in which units it is defined in Salome

For example, you have a CAD part of a piston whose diameter is 125mm.
After importing the CAD file in Salome, the bounding box command tells you that your object bounding box is about 0.1249 x 0.1249 x 0.150.
Obviously, your object was imported in meter units. This means now that you will use the MKSI system of units in your analysis.

If you don't like the length units of your imported CAD, just use the "scale" transformation tool in Salome/GEOM to change it to something more suitable.