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

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MarxLiu
Posts: 5
Joined: 25 Mar 2020, 06:34

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

Post by MarxLiu » 25 Mar 2020, 20:06

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.

fferri
Posts: 556
Joined: 09 Sep 2013, 19:28

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

Post by fferri » 25 Mar 2020, 21:15

Have a look at the considerations in Designing dynamic simulations, especially points 6, 7, 8.

MarxLiu
Posts: 5
Joined: 25 Mar 2020, 06:34

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

Post by MarxLiu » 25 Mar 2020, 22:32

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.

fferri
Posts: 556
Joined: 09 Sep 2013, 19:28

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

Post by fferri » 25 Mar 2020, 22:38

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.

MarxLiu
Posts: 5
Joined: 25 Mar 2020, 06:34

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

Post by MarxLiu » 25 Mar 2020, 22:57

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.

fferri
Posts: 556
Joined: 09 Sep 2013, 19:28

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

Post by fferri » 25 Mar 2020, 22:59

Same thing. You can change the values if you select Configuration to Customized

MarxLiu
Posts: 5
Joined: 25 Mar 2020, 06:34

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

Post by MarxLiu » 25 Mar 2020, 23:06

It worked. Thank you so much. : )

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