Optimal Vibration Control of a Three-Story Model Structural Frame Using Piezoceramics
Vineet Sethi and Gangbing Song
Department of Mechanical Engineering
University of Houston,
Houston, TX 77204-4006
Abstract
This research concerns active vibration control of a three-story model structural frame by using piezoceramics smart materials, in particular the PZT (Lead Zirconate Titanate), in the form of patches. These PZT patches are surface-bonded on the structure and function as actuators and sensors. To assist the control design, system identification is first performed. To excite the frame for identification purpose, a sweep sinusoidal input is used to drive the PZT actuator patches and then a sixth order state space model with a fit of 90% is identified to represent the dynamics of the first three modes of the model structural frame. A full-state linear quadratic regulator controller is designed using the identified model. To achieve the full state feedback, an observer is designed using the identified model. Simultaneous vibration suppression for the first three modes is achieved experimentally. Experimental results demonstrate the effectiveness of active control of a model frame structure using smart materials.
