Finite Element (FE) components
VALDYN has an advanced DYNAMICBODY element that allows finite element (FE) models to be connected to other modelling elements to form a fully coupled system that can be simulated directly in VALDYN. This is a powerful technique for representing complex component stiffness which would otherwise be difficult to define in a lumped-mass model.
VALDYN uses a reduced FE model which is derived from a full FE model using the Craig-Bampton method for Component Mode Synthesis (CMS). In the FE model connection, nodes are defined which can be either normal 6-DOF FE nodes or “constrained” nodes representing the average motion of a group of normal FE nodes. All FE nodes that don’t contribute to the motion of connection nodes are reduced out. Results can be back-substituted to obtain component displacement and stress that can be animated within FEARCE.
- Simple incorporation of complex geometry
- Can be used in linear frequency domain analysis
- Back-substitution for displacements and stresses in FEARCE
- Animation of results