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Robust control in smart systems and their management

Stavroulakis Georgios, Pouliezos Anastasios, Amalia Moutsopoulou

Πλήρης Εγγραφή

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Περίληψη

A “smart” structure is one that monitors itself and its environment in order to respond to changes in its conditions. Smart infrastructure systems are a combination of smart structures and the management systems that operate them.In this paper a “smart” system is considered with embedded piezoelectric sensors and actuators. External disturbances are rejected by using controllers, which in practice are based on applied voltages on the actuators. This means that the controllers are the elements that feed forward the signal from the sensor, after suitable modification, to a corresponding actuating signal (controlled release of energy) for carrying out required repair work. Using the theory of production systems and mainly the active vibration control, a composite beam with embedded sensors and actuators is simulated. The control problem is to keep the beam in equilibrium, to face the external disturbances like wind and noise, and to model inaccuracies using the available measurements and controls.After the analysis of the system we check the robust stability and system performance. The introduction of uncertainty permits us to keep the structure in service up to given limits of uncertainty. After that point repair or maintenance actions must be considered. Therefore the management of the system must be considered together with the robust analysis of it. Numerical simulations show the effectiveness and the good quality of the proposed method.

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