The idea of using piezoelectric fibers in the frame of a tennis racket to actively
control vibrations resulting from the ball strike was conceived by ACI
President Richard B. Cass.
As a result of the vibrations, the fibers in the frame of the racket generate
electricity of high potential and low current. This electricity is conducted to
and stored in a coil in a circuit in the handle and released back to the fibers,
in real time, in the optimal phase and waveform for most efficient damping.8
The location of the piezoelectric fiber composites in the racket and the resulting
vibration dampening is shown in Fig. 4.
The tennis racket application may be one of the first commercial applications