Why I can't choose the components?

Spyros T.

Hello, I 've been trying to load some graphics from a .h3d file, but in the menu of "components" there are no options to choose. Any ideas? Also I Have a student's license. thank you.

Praful

Hello Spyros - Since you mention that you have a student license, it is likely that the h3d is not read.

Student license has some limits on the number of nodes and elements that can be used in Hypermesh and HyperView. MotionView uses the same reader for the h3d.

Could you please verify if you can read the h3d in HyperView ? Do you see the graphics on screen and components in the browser ?

regards

Praful

Spyros T.

I tried to open the h3d file in HyperView but it can't load due to a student's licence error, because it exceeds a specific limit of nodes that can be used as you said. Is there any other way to read the h3d file and load the graphics to MotionView?

Praful

Spyros T. said:

I tried to open the h3d file in HyperView but it can't load due to a student's licence error, because it exceeds a specific limit of nodes that can be used as you said. Is there any other way to read the h3d file and load the graphics to MotionView?

Hi Spyros - You can try reducing the number of nodes and elements on the graphic

• You may get a very coarse mesh from Hypermesh. How did you generate the h3d graphic ?
  • You may generate only line elements that shows only the feature lines.

If you have a CAD for this graphic, you may use it directly in MotionView.

I presume this is only for graphical representation and is not involved in any contact modeling.

regards

Praful

 

Spyros T.

Hello again, I found the .hm file and the .H3d from this article,

https://community.altair.com/community?id=kb_article_view&sys_kb_id=3b4c60021b5b51d0c4dfdbd9dc4bcb90

The .h3d file was already generated and I want to use it only for graphic representation as you said. The .hm uses only components to create the geometries. Is it possible for to reduces their number of nodes in order  HyperView to read the .h3d file that will be generated afterwards? 

Regards

Spyros

Praful

Spyros T. said:

Hello again, I found the .hm file and the .H3d from this article,

https://community.altair.com/community?id=kb_article_view&sys_kb_id=3b4c60021b5b51d0c4dfdbd9dc4bcb90

The .h3d file was already generated and I want to use it only for graphic representation as you said. The .hm uses only components to create the geometries. Is it possible for to reduces their number of nodes in order  HyperView to read the .h3d file that will be generated afterwards? 

Regards

Spyros

Hello Spyros

You may certainly try to reduce the number of nodes. The package at the KB article has the hm file with geometry. You may delete existing fine mesh if any and mesh it coarse. Note that these gear graphics are used in contacts. coarser mesh could result in less smooth contact forces, but for your purpose it may suffice.

There is a shaft in the model which is a flexible body. This flexbody h3d has about 16000 nodes. In addition there are other shafts which are also from graphic h3d. When you combine all these along with gear rigid graphics from the new h3d and solve, the resulting Motionsolve result h3d should not contain more than 100000 nodes! Else, you have the same problem of not able to view the animation in HV.

Here are a few suggestions.

1. You can deactivate the h3d graphics for the rigid shafts and replace them with cylinder graphics
2. You may use a different graphic h3d for the flexible shaft which has reduced number of nodes and elements. You may create some line (PLOTEL) elements for the flex graphics. Refer to Step2 Exercise: Manual Methods to Reduce the Size of the Flexbody section in the flexbody tutorial MV-2010
3. Re-mesh the gear graphics in Hypermesh using the Gearbox_CAD.hm in the package. Do you have any familiarity with HM ?

• • Use F2 to bring up the delete panel and delete the existing mesh if any
  • Use F12 to bring up the automesh panel for meshing the surfaces

Iterate with the min elem size and max elem size to get a desired number of nodes.

Note that, the HM might have the component names different than in the existing h3d. Either rename in HM to match the component name  or add graphics using the new h3d and match component to the body.

Component names in the model

 

Good luck !

Regards

Praful

Spyros T.

Hello Praful,

your advice were very helpful, I managed to reduce the nodes under 100000 by increasing the min. size of elements and finally the new h3d file can be read.

Right now I am facing another problem at the contact of the .mdl file. There are open surfaces to all the 3D contacts. Can this be happening due to the new mesh ? Also as you can see, it's like there no elements in the outer surface of the gears .

Regards 

Spyros

Praful

Spyros T. said:

Hello Praful,

your advice were very helpful, I managed to reduce the nodes under 100000 by increasing the min. size of elements and finally the new h3d file can be read.

Right now I am facing another problem at the contact of the .mdl file. There are open surfaces to all the 3D contacts. Can this be happening due to the new mesh ? Also as you can see, it's like there no elements in the outer surface of the gears .

Regards 

Spyros

Hi Spyros - Yes, likely this is because of the new mesh. I feel you went too coarse, that HM failed to give a closed volume mesh !

I used the parameters that I posted in my previous reply as a screen shot and here is the attached HM file. See if this works for you !