[ODE] Friction Coefficients

[Cristian Bianchi]

Hi
friction values in ODE are related to real world parameters, but if you take
a look to the user guide (sec: 3 - 11 - 1) you can observe that friction
coefficient is not unit-less:

"The meaning of mu is changed so that it specifies the maximum friction
(tangential) force that can be present at a contact, in either of the
tangential friction directions. This is rather non physical because it is
independent of the normal force, but it can be useful and it is the
computationally cheapest option. Note that in this case mu is a force limit
an must be chosen appropriate to the simulation"

So... you should use force-friction values and not coefficients!
Regards

Cristian Bianchi
Simulation Software Division
DIES Group - Rome, Italy


----- Original Message ----- 
From: "Abheek Bose" <abheek.bose at gmail.com>
To: <ode at q12.org>
Sent: Wednesday, November 17, 2004 4:52 PM
Subject: [ODE] Friction Coefficients


> Greetings!
>
> I am having some problems with friction coefficients. How are the
> values of mu in ODE related to the real world parameters. For Example,
> if i set mu as 0.6 which is a standard for rubber on concrete then the
> wheels of my car simply slips...
>
> We have tried several experiments with some real cars by making them
> climbing ramps and then simulating the same situation to find the
> corresponding mu in ODE but these do not work.
>
> Could someone please let me know how "real world" friction parameters
> can be made in ODE?
>
> Thanx
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