Learning Forum

[uwindsorspz]

Hello all,

I am working the vibration analysis of one electric machine in workbench. I am tryng to get the "ERP level waterfall diagram", which is the vibration under different rpm and frequency. 

When I succeed to import the load from EM model to workbench, everything is fine. After click the solve, the error of "An error occurred inside the SOLVER module: general error.  " and " Unable to find requested modes. Refer to Troubleshooting in the Help System for more details." come out.

I try to search the error in the solution information, I find that " No modes are available for the harmonic frequency evaluation. "

Is there anyone know how to solve this issue? Thanks.

[Erik Kostson]

Hi

 

Can you add some screenshots of the workbench project schematic and the mechanical set up (assume Harmonic response system - especially analysis settings).

Thank you

Erik

 

[uwindsorspz]

Hello Erik,

Thanks for your reply.

The workbench schematic is shown as below.

The analysis setting is shown as follows:

and the imported romote load sceenshot is as follows:

When I try to do the analysis of one speed, it works. But when I try to use the optimetics function in ansys to setup up the model under different rotation speed, this problem comes out.

 

Thanks for your time.

[Erik Kostson]

 

Hi

So as I suspected you need a modal superposition to harmonic response conenction to do MSUP harmonic that is why it does not find the modes. So connect like here (modal to harmonic systems):

See here :

And a video on modal superposition:

 

All the best

Erik