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August 18, 2023 at 12:19 pm
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August 21, 2023 at 6:28 am
Akshay Maniyar
Ansys EmployeeHi,
Sorry, but I am not sure if I understood your question clearly. Do you want to do the free-free or modal analysis of the steel plate? Also, how do you want to constrain the model? If you can explain how the plate is constrained in reality, then I can help you with the correct boundary conditions in Ansys. I have attached some links to our AIC courses which might be helpful for you.
Intro to Modal Analysis | Ansys Innovation Courses
Modal Analysis in Ansys Mechanical | Ansys Courses
Thanks,
Akshay Maniyar
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August 21, 2023 at 9:08 am
Massochy dos santos Ventura
SubscriberI'm doing a modal analysis on a free-free steel plate in order to extract stiffness matrix, mass matrix and the vectors corresponding to the vibration modes for each natural frequency. in order to reduce the values ​​of the matrices so I intend to restrict some degrees of freedom all nodes since the matrix is ​​formed by the multiplication between numbers of nodes and the degrees of freedom (in this case they are 6)..
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August 22, 2023 at 2:17 pm
Hui Liu
Ansys EmployeeHi, if you are doing free-free modal, it means you don't have any boundary conditions and in this case you will get 6 zero modes like you did. If your question is about how to apply constraints, you can use "displacement" and "fixed rotation".Â
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August 22, 2023 at 2:22 pm
Massochy dos santos Ventura
Subscriberhow can i do this? can you share with me some command that allows you to do this?
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August 22, 2023 at 2:26 pm
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August 22, 2023 at 2:34 pm
Massochy dos santos Ventura
SubscriberI intend to apply these conditions to all nodes
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August 22, 2023 at 2:37 pm
Hui Liu
Ansys EmployeeYou can scope to the entire surface(s) to apply the constraint to all nodes.
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August 22, 2023 at 2:48 pm
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August 22, 2023 at 3:10 pm
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August 22, 2023 at 3:36 pm
Hui Liu
Ansys Employeehighlight all rows > right click > create mode shape results. once the mode shape results (deformation) is created and evaluated, right click on the deformation results > export, this will save the nodal results to a txt file.Â
Â
If you need the x/y/z deformation instead of total, change the "total deformation" to directional.
Â
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August 22, 2023 at 4:49 pm
Massochy dos santos Ventura
Subscriberthank you so much for everythink
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- The topic ‘degrees of freedom’ is closed to new replies.
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