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Definition&Update of the expressions during meshing

Experimenter
Experimenter

Hello experts

 

I am meshing a part using NX9.0. I defined some User Defined expressions (Type: number, Unit: mm) which describe the size of the element that I want to apply. Then I refered the Software Expressions to these User Defined ones when I defined the mesh control. The purpose was to update the mesh control automatically once I modified the values of the User Defined expressions.

 

The problem was when I re-opened the mesh control dialog box after the definition, the software expression became a constant and the reference to the user defined expression seemed don't exist anymore (as shown in the right pic). I have re-defined this reference for many times but it was still the same problem once I re-opened the mesh control dialog box. The weirdest thing was that this problem only happened to some of the mesh controls that I defined, all the others worked fine.

 

I also had similar issues when I defined the offset of the shell element using User Defined expressions.

 

Can anyone help me figure out what's the reason for this?

 

Many thanks

 

Chao

 

1.GIF2.GIF

                    Before clicking "OK"                              After re-opening of the dialog box