Amplitude Control of an Ultrasonic Vibration for a Tactile Stimulator

This paper describes the control in a (d-q) frame of the vibration amplitude of a tactile stimulator based on ultrasonic vibrations. The goal is to fulfill simultaneously two objectives: maintain a constant level of the vibration amplitude and excite the system at the resonance frequency. A new modeling approach is presented in order to facilitate the control and to fulfill the two objectives simultaneously. Then, thanks to an experimental setup, the validation of the new model is performed. Finally, the result of the closed-loop control over a wide range of disturbing factors is presented.