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The joint made a little movement at the begginning of simulation.

Posted: 25 Mar 2020, 20:06
by MarxLiu
Hi guys,
I encountered a problem during testing joint connection. As shown in the below youtube video, the joint dropped down a little at the beggining of simulation. What's wrong? I read the document carefully and checked the joint properties. But I couldn't find the flaw.



The scene file is here:
https://drive.google.com/open?id=1arNZe ... V56D8XtXfF

Does any has some ideas?

Best regards.

Re: The joint made a little movement at the begginning of simulation.

Posted: 25 Mar 2020, 21:15
by fferri
Have a look at the considerations in Designing dynamic simulations, especially points 6, 7, 8.

Re: The joint made a little movement at the begginning of simulation.

Posted: 25 Mar 2020, 22:32
by MarxLiu
Hi fferri,
Thanks for your reply. It worked after I improved the mass to satisfy Consideration 7. I was careless not to check the mass ratio.

Besides, when I tried to adjust engine parameters when simulation wasn't running, the parameters shown gray and can't be configured. is it configuable? Or I need to adjust it in another manner.

Best regards.

Re: The joint made a little movement at the begginning of simulation.

Posted: 25 Mar 2020, 22:38
by fferri
You mean the first three on the right in the Simulation settings dialog?

Image

You have to select custom dt to be able to change those.

Re: The joint made a little movement at the begginning of simulation.

Posted: 25 Mar 2020, 22:57
by MarxLiu
Well, I mean the setting described in https://www.coppeliarobotics.com/helpFi ... Dialog.htm, Which is mentioned is "Design Consideration 6" which you adviced me to read.

Re: The joint made a little movement at the begginning of simulation.

Posted: 25 Mar 2020, 22:59
by fferri
Same thing. You can change the values if you select Configuration to Customized

Re: The joint made a little movement at the begginning of simulation.

Posted: 25 Mar 2020, 23:06
by MarxLiu
It worked. Thank you so much. : )