The Basic Speciality And Research On Experiment Method Of Generation Electricity Through Piezoelectric Vibrators

With the integration enhancing and power loss reducing for the electronicproducts, because of its volume big, the traditional battery, the service life is shortand cannot satisfy the operation requirements gradually;Besides the batteryincludes the heavy metal,and unsuitable for worn of which processing can make theserious environmental pollution. Therefore, people start to seek the substitute ofbattery with energy generation , which obtaining the energy surrounding a systemis to use piezoelectric materials. The purpose of which is substitute the battery orauto recharge the battery in some fields.The advantages of energy generation, liesin simple of structure,without fever, without electromagnetism interference, andeasely manufactured ,easely carried out the minuteness or integrate for the structureetc.The energy generation is applicable to the monitor system particularly.In this paper, the topic is the structure of cantalever with the piezoelectric filmattached to it. The dynamic and static characteristic to the piezoelectric vibratorwere investigated, and found out the optimization designtion of manufacturedfishmonger。The full paper divides six chapters, the content is as follows:Ⅰ,IntroductionIt is well known, the piezoelectricity materials have the ability to be used asmechanisms to transform mechanical energy,usually ambient vibration intoelectrical energy that can be used to power other devices. In certain specialapplication domains, the energy generation of piezoelectric materials can substitutethe battery. And which is the emerging topic in electric power facility research arearecently. This paper has carried on the summary of the research present situation ,which were piezoelectricity electricity generation technology domestic and foreign,and also illuminated the piezoelectricity electricity generation technologyapplication domain and so on. It was found that , thought those research, energygeneration with piezoelectric materials has quit potential for the development of acompletely self-powered electronics. At the same time, this paper also pointed outthe existence questions in energy conversion technology with piezoelectricityceramics. Also this paper summarized progress of technology aspect research withthe piezoelectricity electricity generation domestic and foreign, finally has outlinedmain research work content of this article.Ⅱ,Basic theory of piezoelectricityPiezoelectric materials have a crystalline structure that provides a uniqueability to convert an applied electrical potential into a mechanical strain or viceversa, or convert an applied strain into an electrical current. The latter of these twoproperties allows the material to function as a power harvesting medium.The mechanical and electrical behavior of a piezoelectric material can beweight by the parameter mainly, such as dielectrical coefficient ε,elastic constants,electric constant d,mechanical and electrical coupling coefficient K,mechanicalquality factor Qm and so on. On the basic theory of the correlation piezoelectricityand the piezoelectricity material performance, this paper has investigated theresearch to the different forms of piezoelectric vibrator, and discussed thecantilever beam vibrator of piezoelectric emphasize.The piezoelectric vibrator of energy generation, in this tesearch, used thepattern of bending vibrations, which has mechanical strain violent and the highreaction rate, so it suit to the situation of the positive piezoelectric effect.Ⅲ,Piezoelectric vibrator theoretical analysisThis chapter carried out the analysis of the static dynamic characteristic forpiezoelectric vibrator, and the result indicated that the production voltage theelectric charge and the base frequency of the piezoelectric vibrator were concernwith design parameter, piezoelectricity materials. The preliminary experimentproved that the electrical signal from the piezoelectricity ceramic material produceshas characteristic with high voltage and low electric current. In additional, thischapter analyzed the beam of cantilever with piezoelectric vibrator, and found outthe relation of electric charge quantity to the structure size. The fundamental ofsizes of designs for the cantilever beam was observed. With the width constant, thethumb of design rule increasing length and decreasing thickness under theconstraint of resonance frequency and yield strength σ max ≤ [σ ],ω n≥ ω外, in orderto achieve the maximum charges.Ⅳ,Piezoelectric vibrator finite element analysisBased on the ANSYS finite element analysis software, this chapter carried outthe piezoelectric vibrator in statics,modality, and harmony response analysis.Through the statics analysis the piezoelectric vibrator in different boundarycondition, it is discovered that, under the same static load, the voltage frompiezoelectric vibrator reached the maximum. This chapter carried out the harmonyresponse analysis in the modality analysis foundation to two kind of cantileverbeam plates. The result indicated that, in the resonance frequency peak, thepiezoelectric vibrator induced tension appears the maximum value. It analyzed thesize of the cantilever beam plate of piezoelectric vibrator structure infection to theexternal force -voltage input level, the result is that the piezoelectric vibratorlength is direct ratio to the voltage, and under other geometry parameter certainconditions, when approximately the chip and foundation plate thickness comparesis 0.5, the voltage appears the peak value.Ⅳ,Piezoelectric vibrator experimental study and electric powerfacility trial manufacturingThrough experimental test and finite element analysis the piezoelectricvibrator in static and dynamic, it has obtained the relationship of the piezoelectricvibrator structure size to the performance general, and also confirmed the thirdchapter of this paper. The analysis result indicated that The voltage of the cantileverbeam with piezoelectric in static characteristic, under the condition of not destroythe piezoelectric vibrator structure, is direct ratio to the displacement of free end.And the voltage of the cantilever vibrator reach the maximum value, when the chipand the foundation plate length compares is 0.7 approximately. It is clearly see thatthe length and thickness influence the voltage mainly, gradually, which increasewith the foundation plate and the chip thickness increase, but the width parameterinfluence is small. In addition ,in dynamic characteristic aspect, the length andthickness of the cantilever beam with piezoelectric influence frequencycharacteristic mainly, but the width parameter influence small. Moreover, in theexperiment of impedance matching for piezoelectric vibrator, piezoelectric vibratoroutput the max power when the load resistance matched to piezoelectric vibratorequivalent resistance. Finally, this paper design the piezo-luminescence bait, andthe experiment proven that the cantilever in the piezo-luminescence bait canincrease the electric charge quantity when the best piezoelectric vibrator structuresize applied in it, and which enhanced the light of the emitter diode brightness.Ⅴ,Conclusion and forecastThe six chapter of the paper make conclusion mainly, and proposed the furtherdevelopment of energy generation with piezoelectric materials.