different load step

VAL1
VAL1 Altair Community Member
edited October 2020 in Community Q&A

I want to add different load according to time, like 1~5s 10N,6~10s 20N.

How should I set up load colletor?

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018

    Hi @naoki

     

    You can use Transient response analysis.

     

    Please refer to OS-T: 1310 Direct Transient Dynamic Analysis of a Bracket on OptiStruct help.

  • VAL1
    VAL1 Altair Community Member
    edited June 2018

    Thank you for your reply. I try it to adopt.

    and also I define the contact surface, to know impact force.

    Could you tell me good examples?

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2020

    @naoki

     

    Since you have contact (Nonlinear) it is good to use nonlinear transient analysis. 

     

    Here is a sample file

    Unable to find an attachment - read this blog

  • VAL1
    VAL1 Altair Community Member
    edited June 2018

     

    Can I input table date from excel file below step?

    I want to input csv or excel data.

    Step 3:  Create a TABLED1 (Table to define time dependent dynamic load)

  • VAL1
    VAL1 Altair Community Member
    edited June 2018

    also I got below error. what should I change  ?

    Maximum number of time increment cutbacks reached,
     analysis aborted.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018
    Altair Forum User said:

    Can I input table date from excel file below step?

    I want to input csv or excel data.

    Step 3:  Create a TABLED1 (Table to define time dependent dynamic load)

    You can create a table using TABLED1. Goto Utility browser>>Table create>> TableD1

     

    Can you share the .out file, please?

  • VAL1
    VAL1 Altair Community Member
    edited June 2018

    Thank you so much.

    I added NLADAPT with NCUT checked (value 10)

    The error was disappear, but calculation time became too long.

    Is it right?

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018

    Hi,

     

    Looks like there is some problem with the model.

     

    Is it possible to share the model file?

  • VAL1
    VAL1 Altair Community Member
    edited June 2018

    I don't know whether the model can be shared or not right now. 

    which point should I check?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018
    Altair Forum User said:

    which point should I check?

    It is difficult to tell what to check.

     

     

  • Nachiket Kadu_22143
    Nachiket Kadu_22143 Altair Community Member
    edited June 2018

    @naoki

    Can u try increasing the DT value in NLPARM? What is load increament now? You may also try to reduce the applied load and check.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018

    If you look into out file the EPI error is high. 

  • VAL1
    VAL1 Altair Community Member
    edited June 2018

    Now I try to analyse impact force of lead valve of compressor. 

    Nachiket san Thank you. I'll check it.

    and DT value in NLPARM is set 0.0 originally.

    how much value should be set?  what does DT mean?

     

    Prakash san, when does EPI error happen? 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018
    Altair Forum User said:

    Nachiket san Thank you. I'll check it.

    and DT value in NLPARM is set 0.0 originally.

    how much value should be set?  what does DT mean

    DT is the initial load increment.

     

    EPI is the relative measure with the residual calculated. You can turn OFF convergence due to load in NLPARM>>CONV>> have UW instead of UPW. But, this may affect the accuracy of the results. 

  • VAL1
    VAL1 Altair Community Member
    edited June 2018

    Thank you so much. I totally understand.

    I have another question.

    I captured the movie file. But the annotation text color was changed into black (In Hyper view, they were white).

    How should I capture remaining text color white?

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