In applied sciences, we often deal with deterministic simulation models that
are too slow for simulation-intensive tasks such as calibration or real-time
control. In this paper, an emulator for a generic dynamic model, given by a
system of ordinary non-linear differential equations, is developed. The
non-linear differential equations are linearized and Gaussian white noise is
added to account for the non-linearities. The resulting linear stochastic
system is conditioned on a set of solutions of the non-linear equations that
have been calculated prior to the emulation.