Hypermesh to Msc.nastran

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi all,
 

I am a fresher and so struggling with Hypermesh(HM)
 

I want to use HM as my preprocessor(with Nastran profile) and Msc.Nastran as solver. However, I feel load steps and load collectors do not get converted when I import .bdf .
From google, I found that we need to input some data in .bdf before running in Nastran. However, I am not able to understand what to enter for a particular analysis type.
I am trying modal analysis and FRF.
Please share your views.

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited March 2016

    Hi,

    In Optistrcut we define Loadstep to define the type of analysis whereas in Nastran it can be done using SOL card(SOL 111 for FRF)

    Most of the Optistruct and Nastran cards are almost same.You can perform FRF using Optistruct solver aswell.

     

    Regards

    Rahul R

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2016

    Hi,

    Thank you for your response. However I am not able to figure out how to define SOL card in Msc. Nastran. I have done preprocessing and setting up the deck in Nastran profile.
    I want  to use Msc Nastran as my solver. For this, when I directly run the .bdf file in Msc.nastran , I find no results. However, if I prepare the deck in Msc. patran again, Msc. Nastran gives results.
    I want to learn how to solve in Msc.nastran without using Msc. patran as I can set up the deck in Hypermesh itself.

     

    Regards   
    Sreejith R
     

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited November 2020

    See attached screenshot & refer nastran interface tutorials.

     

    Regards

    Rahul R

    <?xml version="1.0" encoding="UTF-8"?>1_SOL.JPG

    <?xml version="1.0" encoding="UTF-8"?>2_SOL.JPG

    <?xml version="1.0" encoding="UTF-8"?>3_SOL.JPG

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2016

    Hi Rahul,
     

    That was really helpful for one of my practice model. However, I tried the same for another already meshed model(I am not sure of the profile used for meshing). I converted it into Nastran profile  and the ran simulation in  Msc.Nastran.

    I faced the following errors which I am not able to understand :

     

    1. WARN' FOR TEST RESULTS EXCEEDING TOLERANCES

    2.  SYSTEM FATAL MESSAGE 4276 (BP_BIO)

    3.EROR CODE     1039 PID=   0

    4.BIOMSG: ERROR   1039 HAS OCCURRED IN ROUTINE BP_BIO  , FILE INDEX =            1.

    Please share your views on the errors.
    Also please share pdfs for sol 103 and 111(Nastran interface tutorials) as the one shared before for 101 was really helpful.

    Regards
    Sreejith R

     

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