Modeling and Simulation of a Plate with Piezo-Patches as Sensors/Actuators using H-Infinity Controller & Comparison with Classical Controller

Vibration control of a smart structure is investigated by means of PID as well as H-infinity control schemes. The smart structure consists with a cantilever plate of aluminum of size (160mm x160mm) and piezo-patches of size 20mm x 20mm. Sensors and actuators, which are square in shapes, are embedded to the parent structure. The active controller was designed to control first three modes of vibration of plate. The plate was discretised into square elements of identical size in order to optimize the different locations to sensors and actuators, which were assumed to be of the exact shape of the discretized plate elements. A comparison work has been obtained between these two controllers on the basis of data precipitated in the MatLab. The experimental results showed that proposed controllers (PID & H-infinity) can suppress the effect of external disturbances in the plate.