Pin and universal joint between bodies

Anonymous

Pin and universal joint between bodies

Anonymous
Not applicable

Hi,

 

I'm completely new to Autodesk Nastran in-cad. 

 

I need to model pinned and universal joints between bodies in an assembly. How do I go about to do this?

 

With a universal joint I mean that the bodies are connected by spherical bearings that allow rotation around all axis, but are fixed in translation, hence the joint can not transfer moments.

 

Thanks!

 

Roger

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John_Holtz
Autodesk Support
Autodesk Support

Hi Roger (@Anonymous)

 

This post has some information about creating joints between parts of a model: Pinned connection in Autodesk Nastran

 

It also depends on whether you are performing a linear analysis (which uses small displacements) or nonlinear analysis (which uses large displacements and rotations), and whether you are simulating a joint between the model and the environment, or between two parts of the model. For joints between two parts of the model, one solution is to create separate rigid connectors in each part, and then connect the rigid connectors with beams or springs. use end releases on the beams or low spring stiffness to allow the free rotations about the desired directions. These two figures attempt to show the concept.

 

Figure 1: Sample JointFigure 1: Sample JointFigure 2: Five Pieces to Create a Pin JointFigure 2: Five Pieces to Create a Pin Joint



John Holtz, P.E.

Global Product Support
Autodesk, Inc.


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"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉

Anonymous
Not applicable

Hi John (@John_Holtz)

Thank you for the reply. It is a linear analysis with small rotations. The connections basically prevents moment transfer.

 

I made a test case to try what you suggested. It works fine as long as I use one spring to connect the rigid connector at the center of one of the fitting holes to the rigid connector at the center of the lug hole. But, when I add a second spring that connects the rigid connector in the center of the lug hole with the rigid connector in the center of the second fitting hole, it does not work anymore. Basically the lug is no longer free to rotate, which is quite obvious from the stress distribution and deformation. Both springs have high spring stiffness in all directions except from in rotation around the axis of the hole (where it is set to 0).

 

What am I doing wrong here?

 

Thanks

Roger

 

One springOne springTwo springsTwo springsSpring and rigid connector set-up for two springsSpring and rigid connector set-up for two springsSpring configurationSpring configuration

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John_Holtz
Autodesk Support
Autodesk Support

Hi Roger,

 

Out of curiosity, what happens if you delete the first spring (the one that worked) and leave the second spring (the one that did not work).

  • If the lug rotates properly, then there is something strange with the two springs connected together.
  • If the lug does not rotate, then check to make sure the stiffness of the second spring are setup properly.

If you cannot find the problem and solution, please zip the assembly and part files (.iam and .ipt) and attach them to this post.

 

 



John Holtz, P.E.

Global Product Support
Autodesk, Inc.


If not provided already, be sure to indicate the version of Inventor Nastran you are using!

"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉
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Anonymous
Not applicable

Hi,

 

One of a several solutions I already tried. It works with one spring (either spring), but not two. I've attached the assembly and part files to this reply. For boundary conditions I've used a fixed support at the base of the fitting and a rigid connector to a support with freedom to rotate around the hole axis (pinned support) at the other end of the beam with the lug.

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John_Holtz
Autodesk Support
Autodesk Support
Accepted solution

Hi Roger,

 

This was an unexpected problem. Smiley Happy

 

The generic material properties were causing the problem. Because they were so weak (E=0.0001), the analysis thought that the model was underconstrained, so it added some automatic constraints. However it decided to constrain the model, it acted as if the lug was constrained in Rz.

 

If you enter a more realistic modulus of elasticity (such as E=1E5), the analysis runs without warnings and gives the expected deformed shape.

 

 


______________________________________________________________

If my post answers your question, please click the "Accept as Solution" button. This helps everyone find answers more quickly!

 



John Holtz, P.E.

Global Product Support
Autodesk, Inc.


If not provided already, be sure to indicate the version of Inventor Nastran you are using!

"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉
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Anonymous
Not applicable

John,

 

Unexpected and learning by doing 🙂

 

It works, thank you!

 

Would be nice to see an easier way to implement joints and similar boundary conditions in NASTRAN in-cad 🙂

 

Roger

Anonymous
Not applicable

@John_Holtz a follow up question to this.

 

Is it possible to extract the forces in a joint simulated using springs?

 

Thanks,

 

Roger

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John_Holtz
Autodesk Support
Autodesk Support
Accepted solution

Yes, you can view the results in the spring connectors.

 

  1. Before running the analysis, edit the analysis settings ("Analysis > Edit") and check the option to output force.
  2. Run the analysis.
  3. In the results, choose "Other > BUSH FORCE ..." or "Other > BUSH MOMENT ...". ("BUSH" is Nastran's name for a spring element. Smiley Surprised)

 



John Holtz, P.E.

Global Product Support
Autodesk, Inc.


If not provided already, be sure to indicate the version of Inventor Nastran you are using!

"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉

Anonymous
Not applicable

That's good to know.  I was hoping there would be an equivalent to the pin and universal joints that sim-mechanical has, but this will suffice for now.  I'm having trouble setting up the universal joint using the same techniques shown here.  Would you be able to show a similar set-up example for that case?

 

Thanks in advance,

Ben Scheele

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We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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We can access your data only if you select "yes" for the categories on the previous screen. This lets us tailor our marketing so that it's more relevant for you. You can change your settings at any time by visiting our privacy statement

Your experience. Your choice.

We care about your privacy. The data we collect helps us understand how you use our products, what information you might be interested in, and what we can improve to make your engagement with Autodesk more rewarding.

May we collect and use your data to tailor your experience?

Explore the benefits of a customized experience by managing your privacy settings for this site or visit our Privacy Statement to learn more about your options.