Coefficient of Restitution

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Coefficient of Restitution

Postby CANorton » Thu Oct 18, 2012 5:48 pm

Does anyone know how to calculate the coefficient of restitution between two particles from the two restitution values of the particles concerned?
As an example if the restitution value of one object is 0.6 and the restitution value of the second is 0.8 what is the value of the coefficient of restitution when the two objects collide?
I have tried to work out the formula that connects these values but failed.
Many thanks for any help.
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Re: Coefficient of Restitution

Postby korry » Sun Nov 04, 2012 5:48 pm

Hi,
I think, that it is multiplication - choose 0 for one particle and you will not see any bounciness. Only when coeficients of all particles will be 1, it will bounce "forever".
You will see same behavior if particles has 0,5 and 0,2 or 0,4 and 0,25.
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Re: Coefficient of Restitution

Postby tatt61880 » Mon Nov 05, 2012 2:36 am

CANorton wrote:As an example if the restitution value of one object is 0.6 and the restitution value of the second is 0.8 what is the value of the coefficient of restitution when the two objects collide?


The answer is sqrt(0.6 * 0.8) = 0.4 * sqrt(3) = 0.4 * 1.7320508... nearly equals 0.69
NOTE: I'm not an Algoryx member.
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Re: Coefficient of Restitution

Postby CANorton » Mon Nov 05, 2012 11:14 pm

The geometric mean! Now why didn't I think of that.
This is terrific and really useful.
Many thanks.
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