excitation by acceleration Freq resp(modal)

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

I'd like to add excitation by acceleration in Freq resp(modal).

I had below error. how should I do?

(I add DAREA in constraint)

*** ERROR # 2094 ***
  EXCITEID on RLOAD2 # 6 data references follower force or nonexistent
  SPCD # 8.

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Answers

  • VAL1
    VAL1 Altair Community Member
    edited August 2018

    I have another question, I want to add 35G (343 m/s/s).

    But I use the unit (ton, mm, MPa) in the model.

    So Should I input 343000 mm/s/s ?  

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited August 2018

    Use SPCD card instead of DAREA.Whenever load is in the form of acceleration ,velocity and displacement ,we have to use SPCD card.

    Download free eBook on Dynamic analysis using OptiStruct.

    https://altairuniversity.com/free-ebook-learn-dynamic-analysis-with-altair-optistruct/

    In chapter 14 ,example 14.2 and 14.3 we have applied load as acceleration.

  • VAL1
    VAL1 Altair Community Member
    edited August 2018

    Thank you Rahul san

    How should I do about inputting unit?

     

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

    How should I do about inputting unit?

     

    your units are quite right.

    Altair Forum User said:

    But I use the unit (ton, mm, MPa) in the model.

    So Should I input 343000 mm/s/s

     

  • VAL1
    VAL1 Altair Community Member
    edited August 2018

    Thank you Mrt san,

     

    I'd like to confirm the SPCD value.

    Can I check the value of SPCD after setting or reopening file? 

     

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

    Can I check the value of SPCD after setting or reopening file? 

     

    Yes, Either you can check the same by opening the fem file in any text pad or review from constraint panel.

  • VAL1
    VAL1 Altair Community Member
    edited August 2018

    Thank you Prakash san.

  • Mahantesh
    Mahantesh Altair Community Member
    edited January 2019

    Hello Sir,

                      I am facing same error but you were mentioning to assign SPCD card but we were unable to assign the card.. hence please helps to solve this issue

     

    Thanks and Regards

    Mahantesh

  • Mahantesh
    Mahantesh Altair Community Member
    edited February 2019

    Hello Sir,

                     I need some tutorials regarding the  FRF Analysis So kindly help me to get the tutorials

     

     

    Thanks and Regards

    Mahantesh   

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited February 2019

    Please download free eBook on Dynamic analysis using OptiStruct.You will find relevant tutorial and examples.

    https://altairuniversity.com/free-ebook-learn-dynamic-analysis-with-altair-optistruct/

  • Mahantesh
    Mahantesh Altair Community Member
    edited February 2019

    Thanks Rahul for your quick response

  • Mahantesh
    Mahantesh Altair Community Member
    edited February 2019

    Hello Rahul,

                             Those tutorials are not supporting in 14.0 version and those belongs to 17.0 version so kindly send me the 14.0 version tutorial and if it possible send me to the below mail id mahantesh.mvj@gmail.com  

     

    Thanks and Regards

    Mahantesh

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited February 2019

    14.0 is very old version and upgrading to new version would help you to use new features of OptiStruct.

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