[ODE] Added-mass

[Jon Watte]

There is only one mass (even in submarines). However, the distribution of the mass along the different axes (and to some extent, their shape) is described by the inertia tensor. This tensor is created when you use the dMass functions (box, cylinder, etc). You can also set all nine tensor terms directly.

However, ODE has no buoyancy model. Thus, to model non-homogenous buoyancy, especially when in the interface between air and water (i e, in surface mode), you may need to add additional simulation on your own.

Cheers,

			/ h+


-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org]On Behalf Of
Jean-Christophe Zufferey
Sent: Sunday, May 09, 2004 12:44 PM
To: ode at q12.org
Subject: [ODE] Added-mass



Hi all,

Is there a possibility to attribute different mass values to the same
rigid-body for different directions? This is the case for lighter-than-air
vehicules (or submarines) that accelerate a non-negligible air mass with
them. The apparent mass is thus dependent on the geometry of the hull and
different for each directions Ox-Oy-Oz. Instead of having one mass m, we
have mx!=my!=mz.

It seems that dMass doesn't support this, since mass is a dReal. Is there
another way of setting masses?

Cheers,

	jcz


-------------------------------------
      Jean-Christophe Zufferey       
Swiss Federal Institute of Technology
          EPFL-STI-I2S-ASL2          
            1015 Lausanne
-------------------------------------


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