possible bug in SDA.C

pablodecastillo · May 3, 2011, 18:09

Hello,

In the member function Foam::septernion Foam::solidBodyMotionFunctions::SDA::transformatio n() const

the transformation is defined like septernion TR(septernion(CofG_ + T)*R*septernion(-CofG_));, it looks because there is a translation and rotation around of CofG, so to back with the translation would be better septernion TR(septernion(CofG_ + T)*R*septernion(-CofG_ - T));

what do you think?

Pablo

pablodecastillo · May 4, 2011, 02:48

The formulation is correct, there is no a bug.

If i add - T there is no translation.

Pablo

May 3, 2011, 18:09	possible bug in SDA.C	#1
pablodecastillo Senior Member Pablo Join Date: Mar 2009 Posts: 102 Rep Power: 17	Hello, In the member function Foam::septernion Foam::solidBodyMotionFunctions::SDA::transformatio n() const the transformation is defined like *septernion TR(septernion(CofG_ + T)Rsepternion(-CofG_));, it looks because there is a translation and rotation around of CofG, so to back with the translation would be better septernion TR(septernion(CofG_ + T)Rsepternion(-CofG_ - T));* what do you think? Pablo

May 4, 2011, 02:48		#2
pablodecastillo Senior Member Pablo Join Date: Mar 2009 Posts: 102 Rep Power: 17	The formulation is correct, there is no a bug. If i add - T there is no translation. Pablo Last edited by pablodecastillo; May 4, 2011 at 02:49. Reason: correct

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