Optimal vibration control of a plate using optical fiber sensor and PZT actuator

Vibration control of a plate using an optical fiber sensor and a PZT actuator is considered in this study. An aluminum plate with attached extrinsic Fabry-Perot interferometer (EFPI) and PZT actuator is prepared for experimental investigation. The vibration level of EFPI that can represent the mechanical strain without severe distortion is validated by a forced vibration experiment. A linear time-invariant system model is constructed based on the experimentally obtained frequency responses, and an optimal controller is designed for the multi-modal vibration suppression. Control performance is presented in frequency and time domains. It is found that the vibration level of the first three modes can be greatly reduced. The effect of low-pass filtering used to eliminate high frequency noise on the stability and control performance is also considered.