Constrained suboptimal Padé model reduction
An extension of a recent Pade suboptimal model reduction method is presented which ensures that the initial time response values of the reduced models coincide with those for the full system for impulse or step inputs. This desirable property is seen to involve little extra computation and can be implemented on existing computer algebra packages. An example is given to illustrate its use.
Lucas, T.N. 1995. Constrained suboptimal Padé model reduction. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering. 209(I1): pp.35-39. Available from http://dx.doi.org/10.1243/PIME_PROC_1995_209_360_02