MotionView says curve graphics in contact are not coplanar while they actually are
Altair EmployeeHello,
I am trying to build a rigid mbd model with rigid bodies engaging in 2D rigid-to-rigid contact. I have defined curves where the contacts will occur, using the Add Curve functionality. Attached images 1.png, 2.png and 3.png from my curve panel, showing the settings I am using for all three contact curves. As you can see, in the Z direction, they all have the same value as 0. So they are indeed coplanar as they all line on the XY plane.
I proceed to define a 2D rigid-to-ridig contact. Attached image, contact.png, shows my settings for one of the contacts I use. I have also made sure to correctly define the contact sides; so there are no problems there either.
Finally, attached image, error.png, shows two of the error messages I'm getting. All my error messages are the same so I am only showing those two. It is telling me my curve graphics are not coplanar. However, what it seems is that they actually are indeed coplanar.
I would be grateful for any help to fix this problem.
Best regards
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Answers
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Hi,
Is it possible to share the model files?
Please use the file transfer link in my signature below to share model file/
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Hello,
I have just sent the model file. However, for security purposes, I was able to send only the necessary parts, which show all the curves and contacts. It should be enough to let you see the problem.
Thank you.
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Hi,
I got the files. I am looking into this issue.
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Make the curves to be on the same plane by offsetting one of them in that axis and you should be all set.
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Hello @Prakash Pagadala,
Thank you for your reply. Unfortunately, I am still unable to see why I need to offset the curves while they are already sharing the same Z coordinate, which already makes them coplanar. Since all curves look coplanar, how could I know which curve I should offset and by how much?
UPDATE: I checked the coordinates of the points (centers of mass) I use as origins of the curve graphics and saw that they were not perfectly aligned in the Z axis. I manually aligned them and now I am not getting the errors. For future reference, I would suggest others to double check the coordinates of the origin points they use for their curve graphics.
Thank you for your help. My problem is now solved.
Best regards
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@denizbilgili Looks like most of the curves are in a plane whose z coordinate is 80.5. But the two curves (representing inner race and outer race) have z coordinate = 80.4993. Adjust the z coordinate of origin of Curve Graphics so that all are in the same plane and then you should be able to run the model.
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Altair Forum User said:
@denizbilgili Looks like most of the curves are in a plane whose z coordinate is 80.5. But the two curves (representing inner race and outer race) have z coordinate = 80.4993. Adjust the z coordinate of origin of Curve Graphics so that all are in the same plane and then you should be able to run the model.
Exactly, that's how I fixed it. Thank you again for your help and time.
Regards
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