Arkadiy Turevskiy, MathWorks
Approximate nonlinear Simulink® model with a low-order linear model that simulates much faster. Linearize nonlinear Simulink model around a chosen operating point. Reduce the order of the resulting linear model using the Model Reducer App. Use Balanced Truncation method to compute low-order approximation that keeps model states with significant energy contributions, and discards the others.