2nd International Conference on System-Integrated Intelligence: Challenges for Product and Production Engineering Synthetic impedance for adaptive piezoelectric metacomposite

The ongoing improvements in the size and in the power of micro-controllers allow to implement real-time computations of digital filters or control laws. With audio dedicated components, it becomes easier to integrate the control of piezoelectric transducers directly inside structures with discretized feedback controllers. It paves the way to more intelligent systems with adaptive capabilities. Through the z-transform, the behavior of an electrical impedance or of a controller can be written as a recurrent equation directly computable by a micro-controller. Yet the signals are sampled and quantified and it is necessary to run the computations at least twice as fast as the higher frequency f the controlled structure. The delay induced by the computations and the conversion of the signals has to be taken into account to insure the stability of the control. Finally, the type of computation (fixed or floating point) can be a technological problem. This paper highlights the experimental implementation of integrated controlled structures with regards to the technological constraints