ANALYSIS AND IMPLEMENTATION OF A NEW CONSTANT ACCELERATION SUBCYCLINGALGORITHM

An algorithm for explicit integration of structural dynamics problems with multiple time steps is proposed that averages accelerations to ob tain subcycle states at a nodal interface between regions integrated w ith different time steps. With integer time step ratios, the resulting subcycle updates at the interface sum to give the same effect as a ce ntral difference update over a major cycle. The algorithm is shown to have good accuracy, and stability properties in linear elastic analysi s similar to those of constant velocity subcycling algorithms. The imp lementation of a generalised form of the algorithm with non-integer ti me step ratios is presented. (C) 1997 by John Wiley & Sons, Ltd.