Learning Forum

[james.o.brien]

Hello

 I am trying to use a Planar joint in ANSYS Motion (free X, Y, and rotate Z) V2024R1

But the drop down in Joint Properties does not see the Planar Joint I've added.

 

How do I define the motion in said X, Y, and dZ?

[Sourabh Upadhyay]

Hi James,

The Joint properties can be defined only for three types of joints i.e., Revolute, translational  cylindrical.

We can use other boundary conditions based on your requirement. Understanding the actual application which you are trying to simulate may help determine those BCs.

Regards,

Sourabh 

[james.o.brien]

I want to apply a displacement of .2mm in a hula-hoop motion with no rotation (dz=0) 

I  tried two translations one in X and one in Y dir, and used a SIN and COS function to define the X and Y motions but the model became over constraint and only the first translation was activated.  

[peteroznewman]

You can add 2 dummy bodies between body1 and body2 and make a translational joint between body1 and dummy1, a revolute joint between dummy1 and dummy2, then a translational joint between dummy2 and body 2.  This allows you to define a joint load for each joint to control those motions.

 

[james.o.brien]

I actually don't want rotation so perhaps i just fix dummy1 to dummy 2, this might work :) 

[peteroznewman]

If you don't need rotation motion, then you only need dummy1 body so you have a chain from body1 to dummy1 to body2.  If body1 is fixed to ground, body2 is not overconstrained as long as you have a dummy1 body between them.

[james.o.brien]

I added two dummy body and put translation between body 1 and body 2.  This appears to have worked - thanks