System identification and control design for a curved platelike active structure

Active vibration suppression of a curl ed plate incorporating two piezoelec tric actuators is examined, This structure was chosen as one for which it w as assumed that no analytical model could be developed accurately for contr ol design purposes; rather, the aim is to identify a multi-input/multi-outp ut (MIMO) model using Hankel singular value decomposition (HSVD), The measu rement model is fitted simultaneously across all of the transfer functions in a MIMO system; therefore, a set of poles common to all of the transfer f unctions is selected. Different control strategies such as single-input/sin gle-output velocity feedback and MIMO linear quadratic Gaussian (LQG) and H -infinity were designed, implemented, and tested using the model identified . The system was successful in reducing the vibration of the flexible modes of the structure, The major performance limitations were the authority of the piezoelectric actuators and the choice of actuator/sensor complement.