Hello,

The solution must be performed first and then only one can go for retrieving results for nodal degrees of freedom. From your code, it appears that you are trying to retrieve the solution before the solution has actually taken place (*get and *vwrite commnads appear before SOLVE).

Further, you may require a *do loop to retrieve nodal amplitudes corresponding to each substep of the frequency range considered.

Please do correct me if I am wrong.

Warm regards,

Nitin

Thank you Dr Nitin for the reply

Actually I changed it and put the *get command after solving according to you recommend but the same error were appeared .however , I didn't get what you mean by using *do loop can you explain me please

Directly using *get after the SOLVE may not yield the required result.

You have 40 steps in your analysis. After the solution is completed for each step, in order to retrieve the result we have to access the solution for each step. In order to do this, we need to first set (SET) the first solution step as active (by using SET command), read (*get) the required nodal solutions and write (*vwrite) them. Subsequently, this process has to be repeated for the other sets (*do,i,1,40) too. Since you have 40 steps, you would need a *do loop in order to access each of the 40 steps for which the solution has been performed.

You can experiment by modifying your code along the following lines:

/SOLU

*** your analysis steps

FINISH

*do,i,1,40 ! Loop on each solved step

set,i,1 ! Open the step

*get,,,,,, ! complete the command depending upon your requirement

*vwrite,,,,,, ! accordingly complete it

*enddo

Please try and let me know if it works.

Regards,

i tried it but no luck , if it possible i can send you the whole file to see whats the problem by your self

Thank you Dr @Claudio Pedrazzi

i even tried your recommendation but the same warning appear The degree of freedom solution is not available" . in /post26 I can get the results and plot them but for my case isn't helpful because i need to implement a feedback controller according to each step solution

Thank you guys i fixed the problem,

what i did is just divided the full frequency range into 40 steps and by means do loop i effectuated a harmonic analysis for each step then use /Post1 and set command to get the data

your recommendations were so helpful

Regards

Kouider

Great!

I would be happy to learn and know more in detail about the problem you are solving. It would be great if you could share some of your publications or point to some basic works related to your problem

Dear Nitin

iam working right now on the active vibration control of smart FGM plate using discret piezo patches (sensors/actuators) .

my work is based on three steps

1- develop a FEM model of FGM plate and design a PID controller for it based on optimization of the piezo locations and thickness under Matlab

2-implement the same model into ansys and reduce its vibration in time and fréquency response

3-implement an electric circuit as a shunt process to damp the its vibrations in time and fréquency response

and i get some funding i will performe an experimental setup