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Mirro3 Error,FEA Meshing

Question asked by Cadster Tigweld on Jun 21, 2014
Latest reply on Jul 7, 2014 by Jerry Steiger

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:::::Hi Guys::::

<^ Please Open the Part Attached

I am unsucessfully trying to Run FEA on a Wheel Chair to see if it can hold a 300lb Person ( 300lb is 1320 N Y-Asix/Downwards force)

I am running a Static Study

I need to run Convergance Test as well

I tired Meshing;::

All Three:

a) Course

b)Medium

c)Fine

I get Mirror3 Errors

So i checked All my MIRRORS and redid along the RIGHT PLANE

Still get the sme error for all changes that I could possibly come up with

can anyone please take a look at the part and Run FEA Analysis for me/Help ME get past this

if you know how

I added as much details as i could

Thank You for all your help guys

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FEA, Wheel Chair.SLDPRT.zip790.0 KB
1.PNG182.7 KB
2.PNG153.2 KB
3.PNG172.4 KB
4.PNG148.3 KB

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Jerry Steiger Jun 23, 2014 3:37 PM

Cadster,

You're more likely to get a good response in the SolidWorks Simulation/Simulation forum.

I didn't open your part (not enough time and still running SW2010). I see that you have the Convert Entities warning, which I assume means that one of your sketches has some issues. If your parts are bad, getting a good simulation gets evern harder.

For a first pass at the analysis you should use symmetry and just model half of the wheel chair. Everything will go much faster. Since it looks like your mesh error is on a mirrored part, not mirroring may fix that problem. (Or it might be that SolidWorks just found the problem first on the mirrored part and will fail the same on the orginal part.)

Is the chair built up out of tubing? If so, you will have lots of problems trying to get it to solve if you are using solid elements, as the mesh size should be small enough to give a couple of elements through the wall of the tube. Shell elements would be better, since the elements can be much larger. Beam elements would solve the fastest, but I don't know who well they would work for the curved tubes. Best to ask the guys in the Simulation forum.

Jerry S.

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Cadster Tigweld @ Jerry Steiger on Jun 30, 2014 7:24 AM

Thank You Jerry Steiger

A) can you guide me with forces & restrains, How do i model the Wheels

B) How do you represent midsection when running FEA keeping contrains and forces in mind

for example If my mirror plane is the Right Plane all the parts that are cut @ the Right plane would require special representation?

I added a few more pictures now please review

Re: Mirro3 Error,FEA Meshing

Mirro3 Error,FEA Meshing

I rechecked my mirrors nothing i can do to change it

Jerry Steiger wrote:

Cadster,

You're more likely to get a good response in the SolidWorks Simulation/Simulation forum.

I didn't open your part (not enough time and still running SW2010). I see that you have the Convert Entities warning, which I assume means that one of your sketches has some issues. If your parts are bad, getting a good simulation gets evern harder.

For a first pass at the analysis you should use symmetry and just model half of the wheel chair. Everything will go much faster. Since it looks like your mesh error is on a mirrored part, not mirroring may fix that problem. (Or it might be that SolidWorks just found the problem first on the mirrored part and will fail the same on the orginal part.)

Is the chair built up out of tubing? If so, you will have lots of problems trying to get it to solve if you are using solid elements, as the mesh size should be small enough to give a couple of elements through the wall of the tube. Shell elements would be better, since the elements can be much larger. Beam elements would solve the fastest, but I don't know who well they would work for the curved tubes. Best to ask the guys in the Simulation forum.

Jerry S.

the model does have mirror issues

I cannot model half for FEA because that mean I would have to remodel the whole thing

If there is anyone out there that can open my model up and fix the errors that you see that would be really awesome

I know there could me part merging issue because its created in sections and some features might have gaps

i tried merge all parts option under features but it does not show as a click-able command

Please help

Thank You

Actions

Jerry Steiger @ Cadster Tigweld on Jul 7, 2014 8:07 PM

Cadster,

You will be much more likely to get a good response if you move this thread to the SolidWorks Simulation/Simulaton forum. There should be an action available in the Action box at the upper right of the page to do that.

I fear that you are biting off more than you chew in modeling and analyzing this wheel chair.

Jerry S.

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3 Replies

Jerry Steiger Jun 23, 2014 3:37 PM
Mark Correct
Correct Answer
Cadster,

You're more likely to get a good response in the SolidWorks Simulation/Simulation forum.

I didn't open your part (not enough time and still running SW2010). I see that you have the Convert Entities warning, which I assume means that one of your sketches has some issues. If your parts are bad, getting a good simulation gets evern harder.

For a first pass at the analysis you should use symmetry and just model half of the wheel chair. Everything will go much faster. Since it looks like your mesh error is on a mirrored part, not mirroring may fix that problem. (Or it might be that SolidWorks just found the problem first on the mirrored part and will fail the same on the orginal part.)

Is the chair built up out of tubing? If so, you will have lots of problems trying to get it to solve if you are using solid elements, as the mesh size should be small enough to give a couple of elements through the wall of the tube. Shell elements would be better, since the elements can be much larger. Beam elements would solve the fastest, but I don't know who well they would work for the curved tubes. Best to ask the guys in the Simulation forum.

Jerry S.
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- Cadster Tigweld @ Jerry Steiger on Jun 30, 2014 7:24 AM
  Mark Correct
  Correct Answer
  Thank You Jerry Steiger
  A) can you guide me with forces & restrains, How do i model the Wheels
  B) How do you represent midsection when running FEA keeping contrains and forces in mind
  for example If my mirror plane is the Right Plane all the parts that are cut @ the Right plane would require special representation?
  
  I added a few more pictures now please review
  
  Re: Mirro3 Error,FEA Meshing
  
  Mirro3 Error,FEA Meshing
  
  I rechecked my mirrors nothing i can do to change it
  Jerry Steiger wrote:
  
  Cadster,
  
  You're more likely to get a good response in the SolidWorks Simulation/Simulation forum.
  
  I didn't open your part (not enough time and still running SW2010). I see that you have the Convert Entities warning, which I assume means that one of your sketches has some issues. If your parts are bad, getting a good simulation gets evern harder.
  
  For a first pass at the analysis you should use symmetry and just model half of the wheel chair. Everything will go much faster. Since it looks like your mesh error is on a mirrored part, not mirroring may fix that problem. (Or it might be that SolidWorks just found the problem first on the mirrored part and will fail the same on the orginal part.)
  
  Is the chair built up out of tubing? If so, you will have lots of problems trying to get it to solve if you are using solid elements, as the mesh size should be small enough to give a couple of elements through the wall of the tube. Shell elements would be better, since the elements can be much larger. Beam elements would solve the fastest, but I don't know who well they would work for the curved tubes. Best to ask the guys in the Simulation forum.
  
  Jerry S.
  Jerry Steiger wrote:
  
  Cadster,
  
  You're more likely to get a good response in the SolidWorks Simulation/Simulation forum.
  
  I didn't open your part (not enough time and still running SW2010). I see that you have the Convert Entities warning, which I assume means that one of your sketches has some issues. If your parts are bad, getting a good simulation gets evern harder.
  
  For a first pass at the analysis you should use symmetry and just model half of the wheel chair. Everything will go much faster. Since it looks like your mesh error is on a mirrored part, not mirroring may fix that problem. (Or it might be that SolidWorks just found the problem first on the mirrored part and will fail the same on the orginal part.)
  
  Is the chair built up out of tubing? If so, you will have lots of problems trying to get it to solve if you are using solid elements, as the mesh size should be small enough to give a couple of elements through the wall of the tube. Shell elements would be better, since the elements can be much larger. Beam elements would solve the fastest, but I don't know who well they would work for the curved tubes. Best to ask the guys in the Simulation forum.
  
  Jerry S.
  
  the model does have mirror issues
  I cannot model half for FEA because that mean I would have to remodel the whole thing
  If there is anyone out there that can open my model up and fix the errors that you see that would be really awesome
  I know there could me part merging issue because its created in sections and some features might have gaps
  i tried merge all parts option under features but it does not show as a click-able command
  Please help
  Thank You
  Like • Show 0 Likes0
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  - Jerry Steiger @ Cadster Tigweld on Jul 7, 2014 8:07 PM
    Mark Correct
    Correct Answer
    Cadster,
    
    You will be much more likely to get a good response if you move this thread to the SolidWorks Simulation/Simulaton forum. There should be an action available in the Action box at the upper right of the page to do that.
    
    I fear that you are biting off more than you chew in modeling and analyzing this wheel chair.
    
    Jerry S.
    Like • Show 0 Likes0
    Actions

Mirro3 Error,FEA Meshing

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