Research On Composite Amplifier Passive Clamp Piezoelectric Peristaltic Linear Actuator

The piezoelectric creeping linear actuator based on the bionic principle of the inchworm motion has the characteristics of flexible structural design,small size,no magnetic interference,high resolution of displacement,large travel,etc.,and in some areas requiring precise positioning,such as aerospace,precision optics,precision processing,etc.,piezoelectric creep linear actuator has a broad application prospects.There are two kinds of driver clamping methods,one is the active(power-on)clamp,the other is a passive(power-off)clamp,in which the passive clamping method has the advantages of power-off self-locking,energy saving,etc.,and has become a research hotspot in recent years.At present,the main issues that urgently need to be studied in these two clamping mode drivers are that the actuator needs circumferential support and the clamp force is too small.This paper developed a passive clamped piezoelectric creep linear actuator and its driving power.The actuator combines triangular,lever-type amplification structure and integrated structure design concept,and successfully designs a new flat piezoelectric creep drive structure solution,effectively solving the problems of circumferential positioning and clamping force.The drive power is not only miniaturized,but also the drive voltage,drive frequency,and signal form are adjustable,and can be separated from the upper computer to operate independently.First of all,from the working principle of the passive clamping peristaltic actuator,the configuration design and the statics modeling of the actuator are carried out.The design principles of the clamping mechanism and the driving mechanism are obtained,and the key factors for the design of the clamping mechanism and the driving mechanism are determined.Orthogonal experimental method was used to design the reasonable structural parameters of the clamping mechanism.The static mechanics modeling of the driving mechanism was performed.The finite element method was used for verification.The mathematical relationship between the structural parameters and stiffness of the driving mechanism was established and the reasonable structure was determined.parameter.The influence of the structure of the guide rail on the driving effect was studied and the shape of the guide rail was determined.Then,the actuator is simulated and analyzed.Mechanical and electrical properties of the piezoelectric ceramic are introduced as the analysis factors.A mechanical model describing the displacement output characteristics of the piezoelectric ceramic is established and imported into the actuator's structural deformation coordination analysis.The conflict between the large clamping force and the easy release of the clamping mechanism is reasonably coordinated,the problem of coordination between the deformation of the piezoelectric ceramic and the mechanical structure is solved,and the structure analysis method of the actuator is perfected,which provides a theoretical guidance for the actuator design.Finally,a drive prototype prototype was developed.Based on the peristaltic working principle and control strategy,the piezoelectric ceramic capacitor characteristics were taken as the analysis factors to establish its working electrical model.The influence of the electrical characteristics of the piezoelectric ceramic on the dynamic performance of the drive was simulated and experimentally verified.The design principle of the drive power for the creep drive is proposed,a miniaturized drive power is designed,and a drive performance detection device is built.Driven by standard drive power and self-developed drive power,this actuator has a maximum static clamping force of 14 N on one side,a maximum motion drive force of 4N,and a displacement resolution of 0.4?m at 30 V drive voltage.The driving speed is 608?m/s at a driving voltage of 120 V and a frequency of 83.33 Hz.