In this paper we present some new algorithms and software for sensitivity analysis of diierential-algebraic equation (DAE) systems. The algorithms have several novel features which are described and analyzed. The codes, which are extensions of DASSL and DASPK, are easy to use, highly eecient, and well-suited for large-scale problems.
In this paper we present several regularizations for higher-index differential-algebraic equations with rank-deficient or singular constraints. These types of problems arise, for example, in the solution of constrained mechanical systems, when a mechanism's trajectory passes through or near a kinematic singularity. We derive a class of regularizations for… (More)