Forums Technical Discussion how to apply a force to rbd object outside of center of mass

how to apply a force to rbd object outside of center of mass

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spellcraft
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Joined: May 2016
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Hi,

how would I apply a force to a rbd object outside it's center of mass...?

since rbd objects are only represented by a single point I can only apply a force to this point...

I have attached a file to show the problem... at the moment the wrangle in dop only pulls a vel and applies it to the rbd point object... how can I apply this force to a certain point at the rbd geometry...?


thanks...

Attachments:
rbd_com_test_01a_source.JPG (97.2 KB)
rbd_com_test_01a_sim.JPG (94.6 KB)
rbd_com_test_01a.hiplc (325.5 KB)

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Benyee
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Joined: April 2008
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I think you just need to move the center of mass to the custom position.
And then, you should tell the solver you will use custom center of mass rather than the one computed by it.
So you can set these related rbd attriutes after the rbd configuration like this:
i@computecom=0;

v@pivot=chv("com");

"com" parameter must be the custom position.

Attachments:
rbd_com_test_01a_v2.hiplc (333.5 KB)

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