General Mechanical

General Mechanical

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Changing Natural Frequency of Assembly using Simulation

    • BALA
      Bbp_participant

      Iam doing the modal analysis of Assembly structure , I want to change the frequency by doing some design modificatioon like thickness change etc. I have referred the ansys innovation course of "How to use simulation for changing natural frequency". In this course  strain energy per unitt volume is calculated and used for identifying  where the material need to be added or removed for changing frequency. I tried the same for my assembly but the strain energy plot i am getting is not showing any significant difference in the assembly component, which will tell me where to increase the material. mmostly the uniform distribution on structures. 

      please help

    • Nanda Veralla
      Ansys Employee

      Hello Bala,

      Sharing some screenshots of your model and your boundary conditions would really help forum members to better answer your query. I hope it's not confidential.

      Regards,

      Nanda.

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    • BALA
      Bbp_participant

      my bad luck as it is confidential, is there any other way.

    • Nanda Veralla
      Ansys Employee

      Hello Bala,

      Have you changed the expression of energypotential to energypotential/volume in the user defined result? I would try to generate more number of mode shapes and see if I'm still experiencing the same scenario. Ideally this shouldn't be the case. I would also try to stiffen the model in direction which has high participation factor. This will increase my natural frequencies. Let me know how this goes.

      All the best!

    • peteroznewman
      Bbp_participant

      Hello Bala,

      Here is a useful article. Based on that article, I created this tutorial.

      Hope you find these helpful.

      Regards,

      Peter

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