Dynamic Analysis

Karthic_22061
Karthic_22061 Altair Community Member
edited October 2020 in Community Q&A

Hi,

I need to know how to perform dynamic analysis.

As shown in image the hinged flap should open in a time of 1 sec and come to rest immediately after opening , the velocity of 40 mm/s to be given to the butterfly bracket for a time of 1 sec ( which makes the flop to open in 1 sec).

I need to study the dynamic effect due to sudden acceleration & deceleration of flap during start and stop.

 

Please help me how to do this in optistruct

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited September 2017

    I think this should be solved as non linear analysis.Please refer below example.


     

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited September 2017

    Hi Rahul,

    Thank you for the reply.

     

    I went through the help stating that nonlinear static will not take inertia and momentum, But nonlinear transient will take momentum and inertia into consideration.

    If so,  Is it possible to solve the  above with nonlinear transient case?

     

    Please let me know whether I am correct

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  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited September 2017

    Hi Rahul Rajan,

     

    I tried a simple case for nonlinear transient and its considering the dynamic effects as told in help

     

    I still wonder how come a nonlinear transient analysis takes dynamics(inertia / momentum) into consideration but the simple direct transient does not ?

    If non-linearity(Contact/ Geometric/ material )  is the difference between those two cases, how do they vary dynamically

     

    Please help me know the reason for it.

    Thank you

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2018

    Hi Rahul,

     

    I Tried a same link your mode only but after solving the post process videos not slimier than yours. I followed same step as your followed above one but version only different.

    Please help me out.

    Thank you 

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2018

    Hi @prakash k

     

    Can you run large displacement analysis instead and check if that helps?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2018

    Thank you Prakash,

    I have one more doubt also if I need to perform large displacement analysis means what I need to change ( load collector, control cards, load steps) 

    Please tell me..

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