压电发电装置的能量转换及存储特性的研究 毕业论文外文翻译.doc
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1、附录AEnergy Conversion and Storage Characteristics Research on Piezoelectric GeneratorThrough to the cantilever beam piezoelectricity electric power facility energy conversion characteristic theoretical analysis, has obtained the piezoelectricity Liang output voltage and the electrical energy theoreti
2、cal model, but this is merely considers piezoelectricity Liang own factor alone to the power rate the influence rule. But in practical application, what often considered are the piezoelectricity electric power facility output, and its values size and the load resistance concern. Therefore, these rul
3、es have conducted systems research after the piezoelectricity electric power facility external connection loads output, and uses the different resistance number the load resistance to carry on the experimental confirmation.May discover by the second chapter of theoretical analysis, although piezoele
4、ctricity Liang can produce the great voltage, but it each time distorts the electrical energy which outputs to be very limited, still could not meet the modern mostly electronic installations need. This chapter while carries on the theory and experimental study to the piezoelectricity electric power
5、 facilitys output, but also has conducted the memory characteristic research through each kind of storage medium to the piezoelectricity electric power facilitys power rate. May know by the second chapter of piezoelectric vibrators basic theory knowledge, piezoelectric ceramics electricity character
6、istic equivalent circuit may be represented as the electric charge equivalent circuit. And, piezoelectric ceramics dielectric resistance was opposite in the external load, the resistance number was big, might neglect. In the above two kind of situations theoretical calculation formula may see, in pr
7、actical application, regardless of the piezoelectric vibrator uses what connection mode, can have a best load resistance, causes its output maximizing.At the same time, for the confirmation theoretical formulas accuracy, presently separately confirms piezoelectric vibrators in above two kind of situ
8、ations output voltage and the output and between the load resistance size relations through the experimental method, and draws up the corresponding assay curve, and carries on the comparative analysis with the theoretical formula computed result. the test equipment mainly includes the HEAS-5 power a
9、mplifier, the HEV-50 high energy driver, the DS-5000 series digital storage oscilloscope. In the testing through the regulating power amplifiers frequency and the voltage, produces one to assign the oscillation amplitude and the frequency sine drive signal, causes the driver according to this sine d
10、rive vibration. Because the piezoelectric vibrator fixes on the driver, can have a same frequency sine wave alternating current, therefore through the load resistance both sides voltage is also the sine alternating current and the available oscilloscope obtains. According to formula P =V2R, may obta
11、in the power which the load resistance consumes, namely piezoelectric vibrators output. This laboratory uses piezoelectric vibrators size and the material performance parameter are as follows: Piezoelectric ceramics material is PZT-4, piezoelectric ceramics size parameter is: LWh=58mm30mm0.35mm. The
12、 metal foundation plates material is the beryllium bronze, the size parameter is: LWh=80mm30mm0.35mm. Is observable this laboratory use piezoelectric vibrators equivalent capacity size using the Avon meter is: C=0.05 microfarad. Presses may know by the experimental principle, when the regulating pow
13、er amplifier, causes the driver by the frequency f=44.3Hz drive piezoelectric vibrator, then the piezoelectric vibrator has an angular frequency =2f=278.204rad/s sine wave voltage, time its idling voltage output wave shape. May see by this chart, when piezoelectric vibrator idling, its voltage outpu
14、t wave shape is a sine wave, may read out its peak voltage 0v through the oscilloscope is 14.8V.The electrical vibrator outputs between active voltage and active power and load resistance theory relations curve; At the same time, the use experiment test system, the selection different resistance num
15、bers resistance carries on the experiment, may draw up between them the experimental relations curve, its correspondences optimum load and the maximum output performance number respectively are 71.89 kilo ohms and 0.7617 kilowatt; Obtains actually the optimum load and the maximum output performance
16、number respectively are 71 kilo ohms and 0.867 mill watt, this time, the theory and the laboratory correspondences electric current size respectively is 0.103 mill amperes and 0.012 milliamp ere. Works as the piezoelectric vibrator external connection rectification bridge and the filter electric cap
17、acity, what its outputs is the direct current, the output voltage and the power also has the very big relations with the load resistance. Likewise, may result in its output voltage and between the output and the load resistance relational curve by the theoretical formula and the experiment test syst
18、em, the related parameter which the theoretical calculation uses with works as the piezoelectric vibrator is direct and the load is connected when same. May discover by the above research, although the piezoelectric vibrator can produce the great voltage, but its outputs the electric current is rela
19、tively small, its output also can only calculate by a kilowatt level, is opposite in the present some electronic devices normal work power, piezoelectric ceramics power capacity is extremely limited. At the same time, in certain third chapter of piezoelectricity electric power facilitys output and t
20、he memory characteristic analysis, must guarantee, in the piezoelectricity electric power facility does not work in the situation, the electric appliance equipment still could the normal work, this need to carry on the memory to piezoelectric vibrator power rate each time. Therefore, to the piezoele
21、ctricity electric power facilitys energy storage characteristic research is very necessary, this festival carries on saves.Test the selected piezoelectric vibrator, and its structural parameters and material properties are related to the power 3.1 of this chapter to verify test the same as the piezo
22、electric vibrator. Physical map of the test equipment as shown, Piezoelectric vibrator exciter fixed, the piezoelectric power generation device constitutes a cantilever. Power amplifier by adjusting the frequency of vibration can set the frequency according to the piezoelectric vibrator incentives;
23、At the same time, the power amplifier voltage regulator allows different piezoelectric oscillator output amplitude of the AC sine wave; oscilloscope to measure the Parts of generating capacity. Since the piezoelectric vibrator support the use of cantilever, the natural frequency of a higher natural
24、frequency for first-order 98.732Hz, and environment of the local oscillator frequency is well below this value, in order to make the frequency of piezoelectric vibrator and the environment of the natural frequency similarity may be in the piezoelectric vibrator additional focus on the quality of the
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