Learning Forum

[Maria Fernanda Velasquez]

Best regards

 

I am doing a modal analysis and I get the following error:

 

 

 

How can I solve it, because in the and analysis settings and the solution infotmation I don't have that option.

 

thanks

 

 

[Mike Rife]

Hi Maria

What material model is assigned to the first part in the model?

[Maria Fernanda Velasquez]

Hi Mike

The material to be assigned to the first and only part of the model is as follows:

Thanks

[Mike Rife]

Hi Maria

Can you post more details on the model setup.  I've not been able to reproduce this.  

[Maria Fernanda Velasquez]

Hi Mike

 

It is a simple 2D model, a 1m wide by 1m depth. The idea is to replicate this model (see image), to compare results.

 

I thought it was due to the 2D modeling, so I made it in 3D, and I have the same error.

 

Thank you very much for your help

[Mike Rife]

Hi Maria

Ok - but the idea was to review the model that you had set up. Will you be posting screen shots of that?

[Maria Fernanda Velasquez]

Hi Mike

 

The idea is to verify the results of the model in ANSYS, with the example I sent in the image.

 

and no screenshots will be published, I just want to verify results.

[Mike Rife]

Maria

Ok - the title of your post suggests you were attempting an modal analysis.  But then the UCSD model is a harmonic load solved with a time transient analysis (maybe - we have to infer from variables that may or may not actually be used).  And you are essentially asking if your model is set up correctly...but without seeing the model, how are we to offer any advice?  

[Maria Fernanda Velasquez]

Hi Mike

To do a harmonic analysis, you must first do a modal analysis, if it generates the error in the material, I can't advance to the harmonic model, so my question in the post is how to fix the error.

I share a picture of the general configuration of the modeo

 

[Mike Rife]

Hi Maria

Your opening statement "To do a harmonic analysis, you must first do a modal analysis,..." is not true.  Mode superposition is just one method to solve an harmonic analysis.  There are four other methods.  This is a great example of why we need to actually see the model set-up...there are too many variables (modeling options) to guess an issue/solution.

Which version are you using?  Which modal solver?  What is the geometry type?  Plane or Shell?  If Plane what type (plane stress, axisymmetric, etc)?  What is the boundary condition?  

[Maria Fernanda Velasquez]

Hi Mike

 

Thank you very much for your help

The following are answers to your questions

 

Which version are you using?

ANSYS 2022 R1

 

Which modal solver?

Program Controlled 

 

 What is the type of geometry, plane or shell?  If planar, what type (plane tension, axisymmetric, etc.)? 

 

 Plane Stress (see image)

 

 

What is the boundary condition?

Is fixed at the lower edge

Thanks