Learning Forum

[rani.a]

Hi,
I am doing a harmonic analysis for a product which has directly been derived from static structural.
I have applied the frequency (min and max) as a logarithimic pattern and acceleration as input with fixed points at the mounting location.

Theoratically, I have acceleration range based on different frequency values.
Is there any method/way to add a particular acceleration value to a certain frequency value in the harmonic analysis? If not, what else can be done?

Regards,
Rani 

[Erik Kostson]

Hi

Under the acceleration magnitude instead of Constant use Tabular (Frequency).

All the best

Erik

[rani.a]

 

Hi Erik,
Under the Acceleration details, I do not find any option to choose between Constant/Tabular

Kindly help me further on this.

Regards,
Rani

 

[rani.a]

Also, to your notice, I have not added acceleration in the static structural. I do not want acceleration applied on static analysis as you can see in the above tree snapshot.

[Erik Kostson]

 

Hi

Just click inside the X-Component 10000 mm/s2 and a black arrow will appear (see in the images show in the below post) on the right hand side of this box (10000 mm/s2) – click on that arrow and change from Constant to the other option we said.

(https://innovationspace.ansys.com/forum/forums/topic/incremental-force-in-static-structural/)

All the best

Erik

 

[mohan.urs]

Hey,

You do not see it currently as the system is solving. When the solve is complete right click on 10000mm/s2. You will see a drop down to enter values in a table (freq vs Acc).

Check the images above and recreate it in your analysis.

Thanks

[rani.a]

Hi,

Thank you Erik & Mohan for the response, I shall try it after my solving is done.
Also, this is the values of acceleration that can be added w.r.t the frequency, right. But, I have a frequency range of 7Hz-18Hz with 10mm/s2, 18-25Hz with 10-20mm/s2 and 25-200Hz with 20mm/s2.
How can I give a value for a logarithimic sweep. Attached below is the snapshot of the analysis settings, I used.

Awaiting for a quick response.

Regards,
Rani

[rani.a]

Also, my test requires a sweep from 7Hz to 200Hz and back to 7Hz in a log sweep in 15 mintues timeline.
I can get from 7Hz to 200Hz. But is there a way to do it back from 200Hz to 7Hz under a total timeline of 15 minutes?

Regards,
Rani

[rani.a]

 

Hi,
A further doubt from the previous results I just recieved.
After solving, I have received a result that is not acceptable and I would like to know the reason/corrections needed.

The body that is supposed to be moving inside due to vibration and is moving outside the enclosure during the vibration.
The body in red are supposed to be foam material to prevent deformation from vibration & shock, but they are also over-expanding/over-compression than the reality requirement. 

How can I restrict this vibration movement to within inside enclosure. Is it something to do with the contacts.

Also, the top brackets that are mounted on top of the blocks are mounted by bolts to the welded to the outer body are also moving outside the nut areas which are not supposed to.

 

Please help me with this issue as well to check on a smooth solution as per requirement.

 

[Erik Kostson]

Hi

We (Ansys empl.) can not provide much further help here to the follow up questions, as one would need to look at the model in detail - here I would suggest to submit a support request (e.g., to your channel partner - as this forum is not for providing detailed support to customers).

All the best

Erik

[rani.a]

Hi, 

thank you for the response. How can we  submit a support request?

[Erik Kostson]

Hi

Please speak to the person in your company that handles Ansys licences (or an engineer that has created a support to the channel partner (CP)) - they should know which and how to contact the CP that provides support to you.

All the best

Erik