×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Substructure generate problem

Substructure generate problem

Substructure generate problem

(OP)
Hi all,

I'm trying to extract the reduced mass and stiffness matrices from my FE model. I'm using Abaqus 6.13-2 and this is the bit I've introduced into my .inp file:

*STEP, name=CB
*SUBSTRUCTURE GENERATE, TYPE=Z66, MASS MATRIX=YES
*RETAINED NODAL DOFS
101, 13809, 45225
1
5
*SELECT EIGENMODES, DEFINITION=MODE NUMBERS, GENERATE
1
10
1
*SUBSTRUCTURE MATRIX OUTPUT, OUTPUT FILE=USER DEFINED, FILE NAME=B1_CB_MATRICES, MASS=YES, RECOVERY MATRIX=YES, STIFFNESS=YES
*END STEP

The error messages I've got are the following:

Error in job B1_CB-1: in keyword *SUBSTRUCTUREGENERATE, file "B1_CB.inp", line 87866: The following option is currently not supported in a model defined in terms of an assembly of part instances: *SUBSTRUCTURE GENERATE
Error in job B1_CB-1: in keyword *RETAINEDNODALDOFS, file "B1_CB.inp", line 87867: Unknown assembly id 101.
Error in job B1_CB-1: in keyword *RETAINEDNODALDOFS, file "B1_CB.inp", line 87867: Unknown assembly id 1.
Error in job B1_CB-1: in keyword *RETAINEDNODALDOFS, file "B1_CB.inp", line 87867: Unknown assembly id 5.
Error in job B1_CB-1: RETAINED NODES CANNOT BE LESS THAN OR EQUAL TO ZERO
Error in job B1_CB-1: RETAINED NODES CANNOT BE LESS THAN OR EQUAL TO ZERO
Error in job B1_CB-1: RETAINED NODES CANNOT BE LESS THAN OR EQUAL TO ZERO
Error in job B1_CB-1: NO VALID RETAINED NODE HAS BEEN READ.
Error in job B1_CB-1: YOU CANNOT GENERATE BETWEEN 1 AND 0 WITH AN INCREMENT OF 1
Error in job B1_CB-1: RETAINED NODAL DOFS FOR SUBSTRUCTURE GENERATION STEP 1 ARE NOT SPECIFIED. THE RETAINED NODAL DOFS OPTION MUST APPEAR IN A SUBSTRUCTURE GENERATE PROCEDURE.

Could anybody give me a hand on this one?

Thanks in advance,

Joe

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources