[MBDyn-users] Bug to compute angular acceleration (LDLSolve)

Pierangelo Masarati pierangelo.masarati at polimi.it
Wed Mar 19 21:09:50 CET 2014


On 03/19/2014 05:40 PM, CamilleYvin wrote:
>
> The patch corrects the problem. Thanks a lot.
>
Thank you for the quick feedback.  The patch is now available from the 
download page.

Cheers, p.
>
> Best regards,
>
> Camille Yvin
>
>
>
>
>     > Message du 19/03/14 16:04
>     > De : "Pierangelo Masarati"
>     > A : mbdyn-users at mbdyn.org
>     > Copie à :
>     > Objet : Re: [MBDyn-users] Bug to compute angular acceleration
>     (LDLSolve)
>     >
>     > Yes,
>     >
>     > thank you for the report. This bug was recently reported and
>     fixed, but
>     > the fix was not released. Indeed, the next release is being delayed
>     > essentially by lack of time. It should come some time before the
>     end of
>     > the semester.
>     >
>     > I'm attaching the patch, please test and report.
>     >
>     > Sincerely, p.
>     >
>     > On 03/19/2014 10:59 AM, CamilleYvin wrote:
>     > > Dear Mr. Masarati,
>     > >
>     > > I think there is a bug to compute the angular acceleration.
>     Indeed, in
>     > > the function "AutomaticStructElem::ComputeAccelerations", the
>     system is
>     > > solved by the function "LDLSolve" which I think doesn't work
>     because
>     > > when I replace it by "Solve" I get the expected result :
>     > >
>     > > ACCEL W : 2 3 1
>     > > ACCEL Jcg : 392.106
>     > > 38.9418 0 38.9418 207.894 0 0 0 800
>     > > ACCEL W.Cross(Jcg*W) : -1698.43 698.962
>     > > 1299.98
>     > > ACCEL Jcg-1*[W.Cross(Jcg*W)] (LDLSolve) : -4.50861 3.87361 1.62498
>     > > ACCEL Jcg-1*[W.Cross(Jcg*W)] (Solve) : -4.75391 4.25259 1.62498
>     > >
>     > > Could you confirm please ? Thanks.
>     > >
>     > > Best regards,
>     > >
>     > > Camille Yvin
>     > >
>     > >
>     > >
>     > > _______________________________________________
>     > > MBDyn-users mailing list
>     > > MBDyn-users at mbdyn.org
>     > > https://mail.mbdyn.org/cgi-bin/mailman/listinfo/mbdyn-users
>     > >
>     >
>     >
>     > --
>     > Pierangelo Masarati
>     > Associate Professor
>     > Dipartimento di Scienze e Tecnologie Aerospaziali
>     > Politecnico di Milano
>     > _______________________________________________
>     > MBDyn-users mailing list
>     > MBDyn-users at mbdyn.org
>     > https://mail.mbdyn.org/cgi-bin/mailman/listinfo/mbdyn-users
>     >
>     > [ mbdyn-1.5.5-ldl.1.patch (1.2 Ko) ]
>


-- 
Pierangelo Masarati
Associate Professor
Dipartimento di Scienze e Tecnologie Aerospaziali
Politecnico di Milano

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