Frequency domain identification for active vibration control of flexible structures

A mathematical model effective for control plays an important role in active vibration suppression. How to obtain control-oriented model in flexible structure vibration control systems is investigated in this paper. For control-oriented model, identification with experimental approach in control field is more suitable than modal testing method in structural dynamics. According to the characteristics of flexible structures, some preliminaries, precautions and principles that should be observed in design of experiment are presented. Two frequency domain identification algorithms are applied to identify SISO (single-input and single-output) systems and MIMO (multi-input and multi-output) systems. The actual identifications and controls of a SISO and a MIMO flexible structure systems are conducted respectively to illustrate the whole idea and verify validity of the modeling method, the physical meaning of modeling results are discussed to show rationality.