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SFAM 9160

thomas.roy
Running SOL111 for Structural output in NAS2019.1 with ACMS
leads to job abort with ^   
 *** SYSTEM FATAL MESSAGE 9160 (SUBDMAP MDACMS)
   PROBLEM ENCOUNTERED IN CALCULATING DOMAINSOLVER ACMS DOMAIN MODES.
   USER ACTION: IF LARGE MASS IS BEING USED FOR ENFORCED MOTION THEN REPLACE LARGE MASS METHOD WITH DIRECT METHOD
         USING THE SPCD BULK DATA ENTRY.
   USER INFORMATION: IF THE LARGE MASS METHOD IS NOT BEING USED THEN MASSLESS MECHANISMS MAY EXIST.
            PARAM,MECHFIX,YES MAY BE USED TO IDENTIFY MASSLESS MECHANISMS.
1                                     SEPTEMBER 25, 2020 MSC Nastran 12/18/18  PAGE 2780
 
What other can be done, when the presesnt of massles mechanism where checked ?
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  • 0
    Can you please try running with DOMAINSOLVER ACMS(VERSION=OLD) and PARAM,MECHFIX,YES in begin bulk section?
     
    Try checking for things that could generate massless mechanisms like cbush with stiffness only in x,y,z. No stiffness in rotational dof's could make it free to move in those directions and generate massless mechanisms..
    Incorrect RBE2/RBe3...
    See remark for rbe2 from QRG.
    12. It can be any combination in 1, 2, 3, but must have all "456" if any rotation dof is used when there is large rotation.
     
    For rbe3
    5. We recommend that for most applications only the translation components 123 be used for Ci. An exception is the case where the Gi,j are colinear. A rotation component may then be added to one grid point to stabilize its associated rigid body mode for the element.
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  • 0
    Can you please try running with DOMAINSOLVER ACMS(VERSION=OLD) and PARAM,MECHFIX,YES in begin bulk section?
     
    Try checking for things that could generate massless mechanisms like cbush with stiffness only in x,y,z. No stiffness in rotational dof's could make it free to move in those directions and generate massless mechanisms..
    Incorrect RBE2/RBe3...
    See remark for rbe2 from QRG.
    12. It can be any combination in 1, 2, 3, but must have all "456" if any rotation dof is used when there is large rotation.
     
    For rbe3
    5. We recommend that for most applications only the translation components 123 be used for Ci. An exception is the case where the Gi,j are colinear. A rotation component may then be added to one grid point to stabilize its associated rigid body mode for the element.
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