Cantilever self-excited with a higher mode by a piezoelectric actuator

The sensitivity of vibration-type sensors can be improved using a higher resonating frequency cantilever resonator. Resonance in such systems achieved self-excited oscillation, which overcomes the difficulty an external excitation viscous environments. To enhance resonators, several groups have proposed ways to increase natural first mode by changing geometry. However, further oscillation with addition geometry-changing technique. In this study, we present method realize goal. We perform nonlinear analysis governing equation excited piezoelectric actuator. For each mode, also clarify dependence critical feedback gain on location displacement sensor, output is used for control. With aid filters, then devise way generate associated desired frequency. Finally, carry out experiments macro-cantilever and report observation second frequency, than