Topology optimization of one part in the assembly

Vikas_22008
Vikas_22008 Altair Community Member
edited July 12 in Community Q&A

Hi,

I have to do the topology optimization of a single part in an assembly. The assembly has contact interfaces with friction  so it will be a non linear static analysis with small displacements. For some reason, after some iterations, the simulation is not converging.  I don't know where am i doing mistakes. I have attached nl.out file for your reference. Is it the definition of the design and non design space around contacts ? or is it the constraints, responses? I dont know. 

Your suggestions will be greately appreciated.

Regards
Vikas M B

P.S I cannot upload the model file because of its confidentiality.

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Answers

  • Rajashri_Saha
    Rajashri_Saha
    Altair Employee
    edited July 11

    Hi Vikas,

    Can you add DT=0.01 in NLPARM card and rerun?

    I don't see any value for DT from your nl.out card. Have you done with analysis run before proceeding to Optimization?

    Thanks

    Rajashri

  • Vikas_22008
    Vikas_22008 Altair Community Member
    edited July 12
    Rajashri Saha_20525 said:

    Hi Vikas,

    Can you add DT=0.01 in NLPARM card and rerun?

    I don't see any value for DT from your nl.out card. Have you done with analysis run before proceeding to Optimization?

    Thanks

    Rajashri

    Hi Rajashri,

    I have added NINC 10 in NLPARAM card. One can either add NINC or DT, right?

    I have done the analysis before proceeding to optimization. Please check the attachments. one of them is .out file and other is nl.out file. For some reason, i am not able to write the initial analysis results into nl.out file. Only the iterations of optimization results are written into the nl.out file. 

    The optimization converges till 8th iteration and from 9th it doesn't. Could you please suggest some ideas.

     

    Thanks 

    Vikas M B

     

     

     

  • Rajashri_Saha
    Rajashri_Saha
    Altair Employee
    edited July 12
    Vikas_22008 said:

    Hi Rajashri,

    I have added NINC 10 in NLPARAM card. One can either add NINC or DT, right?

    I have done the analysis before proceeding to optimization. Please check the attachments. one of them is .out file and other is nl.out file. For some reason, i am not able to write the initial analysis results into nl.out file. Only the iterations of optimization results are written into the nl.out file. 

    The optimization converges till 8th iteration and from 9th it doesn't. Could you please suggest some ideas.

     

    Thanks 

    Vikas M B

     

     

     

    Yes, you can use NINC instead of DT. Instead of 10, use 100(smaller increment) as in NLADAPT you have defined DTMAX to be 0.1.

    You need to check contact id 1 as max pressure correction is happening there.

    MAX PRESSURE CORRECTION     -.3165905618D+04      AT NODE    105618      CONTACT ID         1.

    Thanks

    Rajashri

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