Influence of Multidirectional Oscillations on Output Characteristics of Inertial Piezoelectric Platform

A piezoelectric platform driven by a multifunctional piezoelectric actuator is used to investigate the influence of multidirectional oscillations on the output characteristics of an inertial piezoelectric platform. Multidirectional oscillations can be generated by the vibration PZT (lead zirconate titanate piezoelectric ceramics) element of the actuator while the platform is driven by the actuation PZT element. The output characteristics are tested with the changing amplitude and frequency of multidirectional oscillations. An interesting phenomenon is observed when the amplitude or frequency is larger than specific values: The sticking and sliding displacements decrease quickly, and the step distance drops to zero rapidly; in other words, the oscillations determine the displacement response. The oscillation perpendicular to the contact plane is selected to switch friction and alleviate the inherent defects of the inertial platform. The response displacement is measured under a voltage of 600 V
_p-p
and a frequency of 1 Hz; the linear fitting is carried out, and the calculated correlation coefficient is improved from 0.987 to 0.995 by using friction switching; and a larger output force is also obtained. The results indicate that friction switching can be applied to obtain a high linearity displacement output and a large output force for the inertial platform.