TY - GEN A1 - Barth, Eric A1 - Leimkuhler, Benedict A1 - Reich, Sebastian T1 - A Time-Reversible Variable-Stepsize Integrator for Constrained Dynamics N2 - This article considers the design and implementation of variable-timestep methods for simulating holonomically constrained mechanical systems. Symplectic variable stepsizes are briefly discussed, we then consider time-reparameterization techniques employing a time-reversible (symmetric) integration method to solve the equations of motion. We give several numerical examples, including a simulation of an elastic (inextensible, unshearable) rod undergoing large deformations and collisions with the sides of a bounding box. Numerical experiments indicate that adaptive stepping can significantly smooth the numerical energy and improve the overall efficiency of the simulation. T3 - ZIB-Report - SC-97-53 Y1 - 1997 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-3220 ER -