I'm new user of Nastran NX. In my study I want to perform some model reduction such as CMS (Craig-Bampton), static and dynamic condensation, for future simulations. I need to extract mass and stiffness matrices to ASСII format. I used command PARAM,EXTOUT,DMIGPCH, but did not received any results.

Then, the components are assembled back together with a process called Component Mode Synthesis (CMS) to give the eigenvalue solution of the entire assembly. Using ACMS is easy and does not require any separate installation and maintenance.

Unlike other Nastran codes, a 6 degree-of-freedom per node formulation is used for all shell elements. CROD Bulk Data Entry Defines a tension-compression-torsion element (ROD) of the structural model.

This is the guide for CMS analysis in MSC/NASTRAN. It is necessary for you to appreciate DMAP command in order to run your input file in MSC/NASTRAN. The steps below inform you how to modify DMAP command. The two example files with this DMAP command are included in the folder, “<Install Dir>\Toolkits\Flexible input files\NASTRAN\NASTRAN_scm.dat” 1.

Jul 20, 2012 · The condensed models I typically work with (or generate) are obtained using dynamic reduction (CMS). Therefore, using SOL103 for the reduction run. The formats I get for the matrices are typically op4 or dmig (dmigpch).

You can either write the matrix to a nastran punch file or to h3d file. Imagine you have huge automotive structure which is very large and dont want to include everything for your analysis. Using Dynamic reduction methods you can simplify the model.

Identification of a CMSMETH Bulk Data Entry. All subcases must have the same MPC reference; in which case it runs the component mode synthesis (flexible-body preparation) solution sequence using the CMSMETH reference and the common MPC reference.

Aug 9, 2016 · Component Mode Synthesis (CMS) reduction adds component modes of model partition to static reduction to approximate internal dynamic behavior of component

May 12, 2017 · This video demonstrates how to alter the SOL 103 solver execution with a NX Nastran DMAP. It demonstrates the solver setup in NX SOL 103 to perform a Component Mode Synthesis model reduction in...

Aug 25, 2008 · Dear collegues, I have to generate end use a superelement for a modal analisys with MSC Nastran. Someone has an input file example? ALF.