AAS 95-391
On a Systematic Way to Compute Geometric Stiffening Terms For Multibody Simulation
R. Schwertassek, DLR Institute for Robotics and Systemdynamics, Germany
Abstract
The motion of flexible bodies in a multibody system can be represented in many applications as a superposition of a large reference motion and small deformations, which allows linearization in the deformation variables. Because of large inertial forces resulting from the large reference motion so called geometric stiffening terms appear in these linearized equations. The modelling of geometric stiffening due to large centrifugal forces is well understood in multibody simulation. A generalization of the procedure applying to othercases of inertial loading or to loading due to large interaction or external forces will be presented for an Euler/Bernoulli-beam-model. The incorporation of the model into the multibody code SIMPACK will be presented together with simulation results.