MODEL-REDUCTION BY REPRODUCING THE ASYMPTOTIC RESPONSE

The forced response of a linear stable system can be decomposed into a system component (transient term), an input component (steady-state o r asymptotic term) and, possibly, an interaction component (resonant t erm). The paper considers the problem of determining reduced-order mod el that reproduce the original input and interaction components for su itable inputs. The choice of the input depends on the order of the red uced model and its desired performance. The interpolation properties e njoyed by the resulting approximating transfer function are pointed ou t. It is shown that several popular reduction methods can be regarded as particular cases of the suggested approach. Finally, two illustrati ve examples are given.