topic Re: Pressure Maps in Robot Structural Analysis Forum

Pressure Maps

Anonymous — Mon, 20 Nov 2017 11:54:05 GMT

Hi guys,

i´m having a problem to display pressure maps generated by wind simulation, i had to erase the first wind simulation cases and do it again, and now i just can´t see the pressure maps.

Can anyone help me?

Re: Pressure Maps

piperr — Mon, 20 Nov 2017 16:34:59 GMT

Forcas geradas automaticamente ?

Re: Pressure Maps

Rafacascudo — Mon, 20 Nov 2017 20:00:14 GMT

Pode mandar o modelo?

Re: Pressure Maps

Artur.Kosakowski — Tue, 21 Nov 2017 09:53:40 GMT

Hi @Anonymous

Is it the same if you run next simulation with the same parameters?

Re: Pressure Maps

Anonymous — Tue, 21 Nov 2017 12:14:31 GMT

It is the same parameters but with aditional structural elements.

i did delete the previous wind simulation cases and run it again, the forces are generated, but the pressure maps doesn´t appear anymore.

Re: Pressure Maps

Artur.Kosakowski — Tue, 21 Nov 2017 12:54:40 GMT

Hi @Anonymous

I made a quick test and I can't see any issue with pressure map display. Try the steps below:

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

Re: Pressure Maps

Anonymous — Tue, 21 Nov 2017 13:27:17 GMT

I did those steps with no success. Very strage indeed, because only some claddings disappear, and no pressure maps are displayed.

Re: Pressure Maps

Artur.Kosakowski — Tue, 21 Nov 2017 13:35:03 GMT

Hi @Anonymous

As @Rafacascudo already asked - could you attach this model?

Re: Pressure Maps

Anonymous — Tue, 21 Nov 2017 16:06:55 GMT

@Rafacascudo, @Artur.Kosakowski , it already occured in other models when i needed to simulate wind more than once.

Re: Pressure Maps

Rafacascudo — Tue, 21 Nov 2017 18:59:16 GMT

Machini4,

All claddings have to be perfectly flat for them to work. That´s your main problem concerning the wind generation. It will not generate loads on chosen claddings if they are not flat.

But this "unflatness" comes from the fact that your model has lots of "imprecise modelling" . Check below some of the truss nodes coordinates on "Cartesiano P" axis.

Probably you created the claddings with many "snaps" turned on and certainly this is the most common cause for so many imprecisions.

You should very much correct your model . Try using Edit/detailed correct .

I prefer ALWAYS to build the model snapping to nodes . Avoid snapping to grid points!!!

Correcting your nodes will automatically correct most of your bar positions. Only then you should correct your claddings .

There´s an excelent tool to check and correct cladding flatness on

https://forums.autodesk.com/t5/Autodesk-Robot-Structural/API-addin-checking-flatness-of-panels-contours-claddings/m-p/3490478/highlight/true#M5337

Using it I was able to make most of your claddings to "receive" load from the wind generator. As you can see below , Some are still not getting wind load

This below are the messages when I ran your model just for this wind load I created.

Instability Type 1 cannot be ignored. Check the webinar 16 about instabilities on Build your Robot Structural Analysis IQ - YouTube

For good practices on panel modelling check webinars 1 an2 on the same link.

Also , there are some fixed supports on the upper levels!

There´s now a Brazilian Robot forum on

https://forums.autodesk.com/t5/robot-structural-analysis/bd-p/2052

Re: Pressure Maps

Anonymous — Wed, 22 Nov 2017 19:22:25 GMT

Thank you Rafael Medeiros.

I did correct the modeling imperfections and all came back to normal.

Re: Pressure Maps

Anonymous — Mon, 21 May 2018 10:00:05 GMT

@Rafacascudowrote:
Machini4,

All claddings have to be perfectly flat for them to work. That´s your main problem concerning the wind generation. It will not generate loads on chosen claddings if they are not flat.

But this "unflatness" comes from the fact that your model has lots of "imprecise modelling" . Check below some of the truss nodes coordinates on "Cartesiano P" axis.

Probably you created the claddings with many "snaps" turned on and certainly this is the most common cause for so many imprecisions.

You should very much correct your model . Try using Edit/detailed correct .

I prefer ALWAYS to build the model snapping to nodes . Avoid snapping to grid points!!!

Correcting your nodes will automatically correct most of your bar positions. Only then you should correct your claddings .

There´s an excelent tool to check and correct cladding flatness on

https://forums.autodesk.com/t5/Autodesk-Robot-Structural/API-addin-checking-flatness-of-panels-contours-claddings/m-p/3490478/highlight/true#M5337

Using it I was able to make most of your claddings to "receive" load from the wind generator. As you can see below , Some are still not getting wind load

This below are the messages when I ran your model just for this wind load I created.

Instability Type 1 cannot be ignored. Check the webinar 16 about instabilities on Build your Robot Structural Analysis IQ - YouTube

For good practices on panel modelling check webinars 1 an2 on the same link.

Also , there are some fixed supports on the upper levels!

There´s now a Brazilian Robot forum on

https://forums.autodesk.com/t5/robot-structural-analysis/bd-p/2052

With that, I can not model a Sphere like a Radome? Can you check this File Rafa. I tried making a Sphere but I can not regenerate pressure on its Surface including the Maps.

Re: Pressure Maps

Rafacascudo — Mon, 21 May 2018 12:45:45 GMT

The Panel has to be flat . Your dome is just one panel . Iwould have to be made by a group of isolated flat panels.

I tried using an addin by @Rafal.Gaweda that transforms every single FE on an isolated panel .

https://forums.autodesk.com/t5/robot-structural-analysis/get-local-axis-of-finite-elements-via-api/m-p/5955653#M40283

I have used it before on another model and it worked perfectly. But it is not working not on yours or any other.

Re: Pressure Maps

Rafal.Gaweda — Mon, 21 May 2018 13:09:52 GMT

Hi @Rafacascudo

Converted dome attached (file for v.2018).

Re: Pressure Maps

Rafacascudo — Mon, 21 May 2018 17:03:27 GMT

not here

Re: Pressure Maps

Rafal.Gaweda — Wed, 23 May 2018 08:54:03 GMT

Hi @Rafacascudo

What is Your Excel? 32 or 64 bit?

Macro should report 810 FEs instead of 29782.

PLease (re) register Robot as Admin and run it as Admin

Re: Pressure Maps

Rafacascudo — Wed, 23 May 2018 11:28:05 GMT

How to re register robot as admin?

opening robot as admin gives the same error

opening excel as admin gives " Open Robot and load model" warning

Re: Pressure Maps

Rafal.Gaweda — Wed, 23 May 2018 11:35:36 GMT

Hi @Rafacascudo

From right hand click mouse menu:

i have the same problem and i can't solve it

Anonymous — Tue, 31 Jul 2018 19:07:31 GMT

i have the same problem and i can't solve it

Re: i have the same problem and i can't solve it

Artur.Kosakowski — Wed, 01 Aug 2018 09:42:43 GMT

Hi @Anonymous

What problem is it exactly?