jgerstmayr
commented
2 years ago 1) The formulation in general is using redundant coordinates with constraints. Equations for objects are derived in various ways, so there is no particular Newton-Euler or Lagrange, except for the Rigid body; this is described in theDoc.pdf at the according objects. 2) The recursive formalism is only available for rigid bodies in the KinematicTree, see KinematicTree.cpp 3) I to no know Recurdyn in depth, but Exudyn uses no approximation of inertia and directly import finite element stiffness and mass matrices. It has a rich interface to NGsolve (ngsolve.org), but also to Abaqus and Ansys You are welcome!
yumianhuli2
Hello!Dear EXUDYN Team! I have the following questions： 1 Is this flex-multibody dynamics encoded based on Newton Euler recursive formula or Lagrange formula + constraint or both? 2 If it's Newton-Euler where is the core recursive formula in the file? If it's Lagrange, where are the core documents 3 I see the finite element display in the engine piston connecting rod in the picture introduced, is this package similar to Recurdyn MBFD(multibody-flex with FEA) calculation formula at the same time? Thank you very much！