Commit graph

4 commits

Author SHA1 Message Date
Henry Weller
df1cb90dc6 rigidBodyDynamics: Simplify handling of quaternions by maintaining a unit quaternion in the joint state field 'q'
'w' is now obtained from 'v' using the relation w = sqrt(1 - |sqr(v)|)
and 'v' is stored in the joint state field 'q' and integrated in the
usual manner but corrected using quaternion transformations.
2016-04-12 21:44:34 +01:00
Henry Weller
591cb1d11e rigidBodyDynamics/rigidBodySolvers: Added support for the integration of quaternion joints 2016-04-12 16:16:57 +01:00
Henry Weller
c07bc87f95 rigidBodyDynamics/rigidBodySolvers: Added run-time selectable solvers to integrate the rigid-body motion
Currently supported solvers: symplectic, Newmark, CrankNicolson

The symplectic solver should only be used if iteration over the forces
and body-motion is not required.  Newmark and CrankNicolson both require
iteration to provide 2nd-order behavior.

See applications/test/rigidBodyDynamics/spring for an example of the
application of the Newmark solver.

This development is sponsored by Carnegie Wave Energy Ltd.
2016-04-12 11:33:20 +01:00
Henry Weller
81eec80d5d rigidBodyDynamics/rigidBodyModelState: New class to hold the motion state of the rigid-body model
This is a more convenient way of maintaining the state or multiple
states (for higher-order integration), storing, retrieving and passing
between processors.
2016-04-11 19:01:16 +01:00