Research On Actuator Based On Inverse Piezoelectric Effect

Dynamic experiments have been widely used in engineering fields such as vibration simulation,fatigue failure,strength analysis.With the deepening of research,the accuracy of dynamic experimental results has become the focus of attention.The core part of the dynamic force experiment is the dynamic force source.The accuracy of the dynamic force source is closely related to the accuracy of the dynamic force experiment.The existing dynamic force generation methods have low force direction accuracy,easy overload,and introduce nonlinear errors.If we want to ensure the accuracy of dynamic force experiments,high-precision and controllable,adjustable dynamic force generators are essential.In this paper,with the goal of developing a new high-precision dynamic force source,an actuator based on the piezoelectric effect is designed and developed.The piezoelectric wafer will deform under the action of the electric field.By limiting the free deformation on both sides of the wafer,the transformation from deformation to force is realized,so that the device can output force;Benefiting from the piezoelectric sensor has the characteristics of good dynamic characteristics,independent rigidity and sensitivity,etc.the piezoelectric sensor is added to the device to realize the real-time measurement of the dynamic force on the device,thereby ensuring the accuracy of the output force value.The piezoelectric effect expression is obtained by studying the properties of quartz crystal,piezoelectric mechanism and piezoelectric effect;Completed the selection of piezoelectric wafers through research and analysis on the selection of crystal cut type,the selection and composition of crystal groups;According to the different types of piezoelectric effects,the entire device is refined in function,using piezoelectric actuators as the force source generating unit,and using piezoelectric sensors as the synchronous detection unit.The mechanical structure of the entire device is completed.Explained the structure of important parts and their connection and assembly methods,and performed the necessary size calculations.The piezoelectric sensor was statically calibrated under different force ranges.After analyzing and processing the calibration data,the maximum nonlinear error and repeatability error are both about 1%.The measurement accuracy and stability are very good,and it can be realized to measure the output dynamic force of the actuator;Through the finite element analysis software,the statics and modal analysis of the entire device are carried out,the static deformation and the first six-order natural frequencies of the device are obtained,which indicates that the static and dynamic performance of the device is good.In order to comprehensively detect the performance relationship between the input voltage and output force of the device,the performance experiment is divided into groups such as low voltage and high voltage,analyzing the measured data,the result shows that the input voltage value and the output force value have a very strong linear relationship and the sensitivity and resolution of the device are good;The dynamic performance of the whole set of equipment was verified by the hammering method,and the experimental results showed that the dynamic performance of the equipment was good and met the actual demand.