System identification and active vibration control of a composite I-beam using smart materials

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Abstract

This research concerns active vibration control of a 3.35-m-long composite I-beam in a cantilevered configuration by using peizoceramics smart materials, in particular the PZT (lead zirconate titanate), in the form of patches. These PZT patches are surface-bonded on the I-beam and function as actuators and sensors. A real-time data acquisition and control system is used to record the experimental data and to implement designed controllers. To assist control system design, open-loop testing and system identification are conducted. To excite the 3.35-m composite I-beam, a sweep sinusoidal input is used and then a state space model is derived for the system. This state space model is used for simulation and development of control algorithms. A positive position feedback (PPF) controller is designed and is simulated using the identified model. Simulations show the dramatic increase in damping of the beams which, when implemented experimentally, shows an increase in the damping up to 1100%. Experimental results verify the simulated results and demonstrate the effectiveness of active control of a civil structure using smart materials. Copyright © 2005 John Wiley & Sons, Ltd.

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