Vibration Control of a Smart Structure Using Fixed Order Dynamic Compensation

The use of direct contact type sensors and actuators for structural vibration control offers the advantage of adding less mass to the structure and permits a wide fre quency range of control, facilitating a means of tunability for structural systems that age or change. The design of a controller using output feedback for such systems is considered in this paper. A recently developed loop transfer recovery procedure for designing fixed- order dynamic compensators that improve both performance and robustness has been applied in the controller design for active vibration control of a cantilever beam with bonded piezoceramic sensors and actuators. For a given order of the compensator, the trade-off between performance and robustness is investigated.