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Fefas
Posts: 3
Registered: ‎03-07-2012
Message 1 of 2 (296 Views)
Accepted Solution

Spherical Joints

296 Views, 1 Replies
03-07-2012 09:41 AM

Hi Guys,

 

I have a simple project that I am having problems with.

 

I got a shaft and a base, and they will be connected using a spherical joint.

up to this point it is ok. I have used mate constrain to align the points on the spheres and everything is alined.

But when I make it simulate on dynamic simulation the shaft goes through the base, as it has never existed there, but it keeps the points alined. It should have a limit of around 6 degrees on x and y and rotate freely on the z axis, as a regular ball joint.

 

I have tried 3d Contact joint, It kind of work, not 100% perfectly, because it goes a little bit inside the base geometry and it comes back. But as I have a lot of joint to put on this project I am afraid that a lot of 3d contact joints will make the simulation slow. (it already happened)

 

I am attaching the assemby and parts here.

 

can anyone help me with this?

 

thanks

Employee
henderh
Posts: 649
Registered: ‎06-07-2007
Message 2 of 2 (265 Views)

Re: Spherical Joints

03-08-2012 03:44 PM in reply to: Fefas

Hi Fefas,

 

  You can set up limits for two of the rotational degrees of in the spherical joint properties.

 

  Alternately, you can add the 3D contact joint and change the default stiffness in the joint properties from 1000 to 10000 N/mm.  This way there is hardly any observable penetration.

 

  Please let us know if you have any additional questions, comments or suggestions.

 

Best regards, -Hugh

 

[Edit: added joint properties]



Hugh Henderson
Simulation QA Engineer
DLS

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