3K-3 On the Efficiency of Several Active Materials Used for Vibration Damping

This paper presents the damping of a simple mechanical device, using an active material. In particular, the performances of the system are compared, considering first different active materials: PZT piezoelectric plates, PMN-PT piezoelectric plates and a macro fiber composite (MFC). Then, the damping of several modes in a wide frequency range is presented, using several piezoelectric ceramics, judiciously placed on the device, in order to couple the whole set of modes. In that case, damping is performed with several electrical circuits, each circuit being tuned in a given frequency range. Finally, the performance of a single crystal is compared to a piezoelectric ceramic. The performances of the different devices are discussed, with the help of the experiments