Understanding the export of PARAM,WTMASS

Nastran uses the value of the PARAM,WTMASS parameter to multiply the terms of the structural mass matrix. Since all masses are defined in consistent mass units, the software divides those masses by the value of the WTMASS parameter when you export or solve your model. This keeps the values in your Nastran input file consistent with the WTMASS specification. In Pre/Post, to define a value for PARAM,WTMASS, you can:

• Specify PARAM,WTMASS as a parameter in the Customer Defaults dialog box.

• Defining a value for the WTMASS option in the Solution Parameters dialog box.

• Defining WTMASS in the User Defined section of the Solution Parameters dialog box.

Note:

Although you can also create a User Defined Text modeling object that defines a value for PARAM,WTMASS, Pre/Post will not use WTMASS to divide the masses in your model.

Learn more

Controlling the organization of an exported input file

Preserving Assembly FEM part hierarchy during export

Using the THRU format to export bulk data entries

Exporting DOF Sets in the alternate format

Exporting nodes as fluid grid points

Exporting SPLINE2 elements

MATS1 bulk data entry export

Exporting enforced displacement constraints

Exporting and importing CBEAM and CBAR elements with the OFFT field

Importing and exporting table extrapolation options

Look up more details

Exporting Nastran data

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Understanding the export of PARAM,WTMASS, Simcenter 3D 2021.1 Series

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