Augmented Time-Stepping by Step-Size Adjustment and Extrapolation

Christian Studer, Christoph Glocker
2007 Volume 5: 6th International Conference on Multibody Systems, Nonlinear Dynamics, and Control, Parts A, B, and C   unpublished
Time-stepping schemes are widely used when integrating non-smooth systems. In this paper we discuss an augmented time-stepping scheme which uses step-size adjustment and extrapolation. The time evolution of non-smooth systems can be divided in different smooth parts, which are separated by switching points. We deduce the time-stepping method of Moreau, which is a common order-one integration method for non-smooth systems. We formulate the method using contact inclusions, and show how these
more » ... sions can be solved by a projection. We show how time-steps which contain a switching point can be detected by observing the projection behaviour, and propose a stepsize adjustment, which treats these switching time-steps with a minimal step-size ∆t min . Time-steps in smooth parts of the motion are run with a larger step-size, and an extrapolation method, which is based on the time-stepping scheme, is used to increase the integration order. The presented method is suitable for mechanical systems with unilateral and frictional contacts. For simplicity, we deduce the method considering solely mechanical systems with one unilateral contact.
doi:10.1115/detc2007-34154 fatcat:fcd6o6uq3je3hbe7ijbz2i7mgi