Research On Experiment Method Of Non-Symmetry Inertial Impact Piezoelectric Actuator

Inertial impact force is a novel kind of drive force to construct drive mechanism.Piezoelectric element has many advantages, including high respond speed, high energeticconversion efficiency, simple structure and microminiaturization. therefore piezoelectricelement becomes a type of powerful element of inertia impact drive mechanism.Based on the inertial impact principle, a beeline move inertial impact piezoelectricactuator prototype is made with the piezoelectric bimorphs as the drive mechanism and testedby this paper.The paper is composed of five chapters, such as follows:Chapter 1 IntroductionThe paper summarizes the current using field, the types and characteristics of precisiondriving technology, and sums up the driving materials and status of it. The paper also analyzedthe international piezoelectric driving methods and questions existing at present. Conclude thatpiezoelectric material has large advantage. Meanwhile point out some questions in this field.Introduce some domestic and international researching emphases and fruits in this fieldChapter 2 Piezoelectric performance analysis and the inertial impact drive principleThe piezoelectric drive fundamental principles are piezoelectric effect and conversepiezoelectric effect. The factors which influence performance include dielectric constant ε,elastic constant s ,piezoelectric constant d ,electromechanically coupled coefficients K,mechanical quality factor Qm, etc. With reference to the selected piezoelectric material, thedielectric constant matrix,elastic constant matrix,piezoelectric constant matrix of PZT is putout specially, which will be used in the FEM analysis in the chapter 3. Piezoelectric is a kind ofelastic solids, it has four piezoelectric equations with different independent variable at variousboundary conditions.Piezoelectric bimorph adopt the LE mode of piezoelectric oscillator and is a piezoelectriccomponent with large deformation output, easy-to-control, higher response rapid which suitsfor the inertial impact precise drive. According to the previous cantilever beam piezoelectricbimorph equations, the trend is concluded that the dimension of piezoelectric wafer and baseinfluence the beam's free end displacement, the stiffness and frequency of the cantilever beam,which will be taken as the academic gist for designing the piezoelectric bimorph.Chapter 3 Inertial impact actuator structure design and analysisNon-Symmetry Inertial Impact drive principle is the academic base of Not-Symmetry InertialImpact Piezoelectric. Based on the analysis of two kinds of Symmetry Inertial Impact drives,bring forward a new structure precepts to make Inertial Impact drive—Non-Symmetry InertialImpact Piezoelectric Actuator. This drive can move along beeline and the structure design issimple.Make statics and dynamics analysis about the key part of this drive—Piezoelectricbimorph. Elicit the general relationship between the structure factors of Piezoelectric bimorphand the capabilities.Make experiment analysis about Non-Symmetry cantilever beam structure. Mostly theinfluence to Piezoelectric bimorph comes from the nip hold margin. And the influence comefrom drive voltage and frequency. Get the general principles, offer the foundation for thestructure design and the move test of the drive.Chapter 4 Experiments of the inertial impact actuatorIntroduce the parameters of Non-Symmetry Inertial Impact Piezoelectric Actuator and setup experiment test system. Discuss the characters of this drive and the control ways. Analyzethe relationship between the velocity and the driving wave-forms. Because of the merits of Sinform, easily created, no much noise, so Sin is chosen to be the driving form. Analyze therelationship between the velocity and Nip Hold Margin, elicit that the bigger difference ofNon-Symmetry hold, the faster the drive will be and the greater capability. Analysis twomodulation forms, one is to modulate drive frequency and the other one is to modulate drivevoltage, get out that in different drive frequency the Piezoelectric bimorph has differentdisplacement response and different breadth. In different drive voltage the Piezoelectricbimorph has same displacement response but different vibration breath. So both frequencymodulation and voltage modulate can be used to modulate the pace and the velocity of thedrive.Test the moving characters of the drive. Analyze the velocity and step when changing thedriving voltage or changing the driving frequency. Get out the best way to control the drive isto connect the two ways. When fast moving is needed, can choose the driving frequency from33Hz to 40Hz and with high voltage;when precision moving is needed, can choose thefrequency from 41Hz to 50Hz and with low voltage. Analyze the relationship between velocityand load. Test the loading capacity of the drive. From test, get out the capability of this drivecan over 1000 grams. And the least step can reach 27nm without load.Chapter 5 Conclusion and expectationGive the main conclusion of this paper and the prospect for next research.