Mixed timestepping schemes for nonsmooth mechanics with high frequency damping
For researchers in computational mechanics, this provides a novel integration framework for nonsmooth multibody systems, though the improvement over existing methods is not quantified.
This work develops a mixed timestepping framework for nonsmooth flexible multibody systems with impacts and dry friction, improving non-impulsive trajectories via automatic impulsive corrections. The scheme is consistent with impacts and friction and benefits from the base integration schemes, with comparisons among generalized-α, Bathe, and ED-α methods.
This work deals with the integration of nonsmooth flexible multibody systems with impacts and dry friction. We develop a framework which improves a non-impulsive trajectory of state variables by impulsive correction after each time-step if necessary. This correction is automatic and is evaluated on the same kinematic level as the piecewise non-impulsive trajectory. The resulting overall mixed timestepping scheme is consistent with respect to impacts and friction as well as benefits from advantages of the base integration schemes used to calculate the approximation inside the time-step. Therefore, we compare the generalized-$α$ method, the Bathe method and the ED-$α$ method.