How to specify time varying moment in hypermesh?

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

Hello!!

 

             I am doing dynamic analysis of vibration measurement test rig for single cylinder engine assembly. I have specified time varying force using DAREA , TABLED1 & TLOAD1.  I want to know how to specify time varying moment of large time history (90 seconds, 0.0003125 s-increment).

 

Thanks & Regards

Ramsubramanian P

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    Hi RamSubramanian,

     

    You can reference MOMENT load in RLOAD1 as excitation load.

     

    Please refer to RLOAD1 card in help for more information.

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    <?xml version="1.0" encoding="UTF-8"?>post-7616-0-23647300-1425885071_thumb.jp

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    Thanks a lot sir image/emoticons/default_smile.png' alt=':)' srcset='/emoticons/smile@2x.png 2x' width='20' height='20'>

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    In same way, DAREA(Rotational dof activated) can be referenced as excitation load in TLOAD1 to specify time varying moment????

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    Hi,

     

    yes you can give DAREA in TLOAD1. Are you performing any rotar dynamic simulation?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    Thanks sir.

     

        No. I am doing dynamic analysis of vibration measurement test rig for single cylinder engine assembly. I am going to apply the reciprocating imbalance forces & moments  at the crank bearing and going to find acceleration response at the crankcase.

     

    Regards

    Ramsubramanian

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015
    Altair Forum User said:

    In same way, DAREA(Rotational dof activated) can be referenced as excitation load in TLOAD1 to specify time varying moment????

     

    Altair Forum User said:

    Hi,

     

    yes you can give DAREA in TLOAD1. Are you performing any rotar dynamic simulation?

     

    I have tried DAREA(Rotational dof activated) to define time varying moment,but it failed.But  if I changed  DAREA(translation dof activated) ,it worked out! I mean DAREA can only be defined as force instead of moment.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    Hi HuangZhou,

     

    You can directly refer MOMENT or FORCE in TLOAD1 card. Refer to the attached snapshot from help.

    <?xml version="1.0" encoding="UTF-8"?>post-7616-0-50223400-1426476119_thumb.jp

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015
    Altair Forum User said:

    Hi HuangZhou,

     

    You can directly refer MOMENT or FORCE in TLOAD1 card. Refer to the attached snapshot from help.

    Thanks for your reply! That is truely what I want to  emphasize! I have used  the same way as you said, and the result is the same compared with result  I get from patran/nastran. 

    •  

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    Well, I will also call MOMENT into RLOAD2.....Thanks....

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    Yes, MOMENT can be used as excited in TLOAD# and RLOAD#

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