[MBDyn-users] Basis Functions and Test Functions??

David Cross (Civ, ARL/VTD) david.m.cross2 at us.army.mil
Thu Jul 15 14:30:01 CEST 2010

Thank you, that answers my question perfectly.  Something else that came 
to mind...

In reading about this type of beam theory analysis in the past, I was 
under the impression that it is most accurate for a frame of beam 
elements which is long relative to its other dimensions, such as a 
helicopter rotor blade.  Should I be worried with the accuracy of the 
beam analysis if I am using a lattice of beam elements, which do not 
make up long and slender frames??



masarati at aero.polimi.it wrote:
>> MBDyn Users,
>> I was wondering if anyone could shed some light onto what type of basis
>> and test functions MBDyn uses when integrating the strains for beam
>> analysis.  I am assuming at this point, linear and piecewise constant??
>> Does this change with the use of beam2 and beam3?
> beam2/3 use linear/parabolic basis functions for position and incremental
> rotation parameters, and piecewise constant test functions.
>> Does MBDyn ever
>> automatically discretize the beams further?
> The discretization is defined a priori in the model, but I'm not sure what
> you mean here; can you elaborate further?
> Cheers, p.

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