Research On Flexible Drive System Based On Piezoelectric Effect And Ultrasonic Vibration

Piezoelectric drive technology is defined as producing rotation or linear motion by controlling mechanical deformation of piezoelectric material depending on the inverse piezoelectric effect of piezoelectric ceramic materials.Based on ultrasonic vibration piezoelectric driving technology,this research investigates the feasibility of piezoelectric vibrators for a flexible driving system and its driving mechanism.First,the actuating principle of the piezoelectric vibrator and its mechanism for flexible driving is theoretically analyzed,and the friction driving mechanism between the piezoelectric vibrator and flexible body is further analyzed.Next,the dynamic design and dynamic analysis of the piezoelectric vibrator are performed using the finite element software,obtaining the third-order in-plane bending mode of vibrator,the natural frequency of vibrator,and particle trajectory after two-phase standing wave superimposed to form traveling-wave on the vibrator surface;besides,the structure of the vibrator is determined.Simultaneously,the main structural parameters affecting the natural frequency of the piezoelectric vibrator are analyzed.Afterward,the piezoelectric vibrator and the fixed device of the flexible drive system are designed and manufactured,and the characteristics of the flexible materials are explored and selected.Finally,the experimental test platform and the flexible drive system are built and the resonant frequency of the piezoelectric vibrator,the surface roughness of the stator and mover,and the output characteristics of the flexible drive system are tested and analyzed.The results indicate that under the excitation voltage with a peak-to-peak value of 200 V and a resonance frequency of 27530 Hz,the maximum speed of the flexible drive system can reach 24.00 mm/s,43.64 mm/s,and 10.43 mm/s,respectively when the thickness of 304 stainless steel flexible metal thin band is 0.01 mm,0.02 mm,and 0.03 mm.The flexible drive system based on piezoelectric effect and ultrasonic vibration in this research has no other complicated structure and the working face of piezoelectric vibrator directly contacts the flexible member.Therefore,unnecessary energy loss and the errors caused by transmission inertia can be avoided.It not only has the advantages of piezoelectric drive power-off,self-locking,and precision drive but also achieves a certain distance drive.Consequently,it has broad prospects in the future,especially in the field of small robot joints and precision drive.