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Chipmunk Physics • View topic - Critical Dampning

Critical Dampning

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Critical Dampning

Postby IcelandicHiman » Tue Oct 19, 2010 2:10 am

Hey

Does anybody know a formula to calculate the critical dampning factor for the damped springs? It doesn't use K for the spring constant so the normal formula doesn't work :(

Thanks
Dan.
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Re: Critical Dampning

Postby slembcke » Tue Oct 19, 2010 10:19 am

I thought it was correct actually. It's been years now, but I vaguely remember checking that I got the equations right. I guess I'll look into it again.
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Re: Critical Dampning

Postby slembcke » Tue Oct 19, 2010 10:56 am

Hrm. :-\

So the stiffness stuff is correct (stiffness = k) as the natural frequency of an undamped spring is correct, but it seems the damping is not. I'll look into it a bit further this morning and see if I can come up with anything to help, but this is something that is going to have to wait for a major version to be fixed.
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Re: Critical Dampning

Postby slembcke » Tue Oct 19, 2010 5:25 pm

Can't sleep... Chipmunks will eat me...
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Re: Critical Dampning

Postby IcelandicHiman » Tue Oct 19, 2010 11:41 pm

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Re: Critical Dampning

Postby slembcke » Wed Oct 20, 2010 9:00 am

It appears you are correct. :O I've had it wrong all this time. I thought that the spring constant k used in Hooke's Law was expressed in units of young's modulus. I remember being taught that at some point...

Young's modulus is given in units of E. Bulk modulus is in units of K (upper case) the units of which looks distinctly different than k (lower case), the spring constant used in Hooke's law. Though it looks like you can use either to calculate k for a given material.
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Re: Critical Dampning

Postby slembcke » Wed May 11, 2011 12:44 pm

Update: This bug was worse than I thought. The 1/2e coefficient only works for 10 iterations. This bug has been fixed in the Chipmunk 6 branch. See this thread for more information: viewtopic.php?f=3&t=1568&p=7326#p7326
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