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reduction for dynamic analysis

i have a rectangular cube modeled with 3 20-node hex elements (picture attached). i need to perform guyan reduction at the nodes G1 to G12. how do i perform this analysis in nx9? can some1 please list all steps in detail ? thank you.

8 REPLIES

Re: reduction for dynamic analysis

Siemens Phenom Siemens Phenom
Siemens Phenom

Select the DOF that you want to reduce to into the a-set. This is done via ASET bulk data entries.

 

See Section 10.3 of the User's Guide.

Re: reduction for dynamic analysis

Creator
Creator
Many thanks Jim. if possible, can you please paste some screenshots of the same.

Re: reduction for dynamic analysis

Siemens Phenom Siemens Phenom
Siemens Phenom

This is done on the Bulk Data tab of the Solution dialog. Create a DOF Set to use as the A-Set:

 

EditSolution.png

Re: reduction for dynamic analysis

Creator
Creator
yes, i have selected the nodes and created the a-set. after running the analysis, which output do i look for ?

Re: reduction for dynamic analysis

Creator
Creator
where can i get the user's guide ?

Re: reduction for dynamic analysis

Siemens Genius Siemens Genius
Siemens Genius

The size of the matrix that is solved (look for 4157 message)  would be different with and without the a-set reduction

 

 

Re: reduction for dynamic analysis

Siemens Phenom Siemens Phenom
Siemens Phenom

The Users Guide is in the NX Nastran documentation. If this is a bundled NX installation, see the NX docs and navigate to CAE, NX Nastran, NX Nastran User's Guide.

 

NX Nastran documentation is also available online at:

 

https://support.industrysoftware.automation.siemens.com/docs/nastran

Re: reduction for dynamic analysis

do i need to define the elements as superelements before running the analysis ? i am unable to find the 4157 message. please help.