In this video tutorial for Salome-Meca 2017, I will show you how to do a modal analysis of a simple plate with Aster-Study!

Here’s what you will learn:

- How to model the plate and prepare the mesh
- How to use the ASSEMBLAGE function to generate the mass and rigid matrix.
- How to use the CALC_MODES function to perform a modal analysis
- How to vizualize the results with Paravis (animation)
- How to write the modal frequencies in a text file

If you want also to understand what is actually a modal analysis, you can check this other article from my blog:

If you like this video, could please help me by liking it? Thank you so much!

–Cyprien

**Any idea for the next tutorial you would like to see?**

Post a comment and let me know!

Kishore says

Hi Cyprien

I have been following your tutorials. they are very detailed. can you post a tutorial on how to do Frequency response analysis, especially for random vibration from a PSD profile.

Piero Ladisa says

Cyprien, be careful: in this tutorial you made a mistake in input data:

Code_Aster has no control on Units System, so in a modal analysis have to input data in coherent units. If you use a model in millimetres and forces in Newton, you are obliged to input mass data in tons and not in kg, for the coherence of the formulation F = m a. So density shall be in Ton/mm3, in this case 2.7e-09.

For all the remainimg, you did a grat job! ;)

Cyprien says

Hi Piero, Thanks! That’s indeed a mistake… I was more focused on showing the analysis process that I forgot about the basics of the choice of unit. I’ll have to add that as a note.

Piero Ladisa says

Great… I am preparing a beginner guide of code_aster in italian, I cite FEAforAll and directly some of your video tutorial, that are fundamental to learn this code… Ciao!

Cyprien says

That’s awesome, thank you so much Piero!