發(fā)布時(shí)間：2018-08-02 13:33

【摘要】：氣動(dòng)系統(tǒng)具有無(wú)污染、結(jié)構(gòu)簡(jiǎn)單、價(jià)格低廉等一系列的優(yōu)點(diǎn),因此被廣泛應(yīng)用于機(jī)械制造業(yè)以及其他各行各業(yè)中。近年來(lái),隨著壓電材料的發(fā)展,把壓電材料的電—機(jī)械轉(zhuǎn)換特性引入到氣動(dòng)閥中,作為氣動(dòng)閥的電—機(jī)械轉(zhuǎn)換級(jí),加快了氣動(dòng)技術(shù)的發(fā)展。壓電驅(qū)動(dòng)利用壓電晶體的逆壓電效應(yīng)形成驅(qū)動(dòng)力,并且壓電晶體產(chǎn)生的位移與輸入信號(hào)有較好的線性關(guān)系,控制方便,產(chǎn)生的驅(qū)動(dòng)力大,帶負(fù)載能力強(qiáng),功耗低,響應(yīng)快,將它作為驅(qū)動(dòng)元件取代電磁線圈來(lái)構(gòu)造氣動(dòng)伺服閥,可以使伺服閥小型化和實(shí)現(xiàn)對(duì)輸出信號(hào)的高精度控制。 根據(jù)實(shí)際情況對(duì)氣動(dòng)伺服閥模型的簡(jiǎn)潔性和精確性進(jìn)行了折衷的考慮,忽略了一些次要因素,建立了既能反映系統(tǒng)內(nèi)在本質(zhì)特性,又能簡(jiǎn)化分析計(jì)算工作的壓電驅(qū)動(dòng)式氣動(dòng)伺服閥的數(shù)學(xué)模型。 本論文通過(guò)MATLAB和AMEsim軟件仿真分析結(jié)果表明：壓電氣動(dòng)伺服閥的頻率為313Hz,頻寬達(dá)到438Hz,響應(yīng)時(shí)間為3.3ms,并且能對(duì)輸入信號(hào)進(jìn)行快速、精確的跟蹤,驗(yàn)證了壓電氣動(dòng)伺服閥的良好動(dòng)態(tài)特性。 通過(guò)對(duì)壓電氣動(dòng)伺服閥施加PID控制和PID神經(jīng)網(wǎng)絡(luò)控制進(jìn)行特性仿真研究,獲得施加PID控制的壓電氣動(dòng)伺服閥的響應(yīng)時(shí)間約為3.1 ms,而運(yùn)用PID神經(jīng)網(wǎng)絡(luò)控制器后,壓電氣動(dòng)伺服閥的單位階躍響應(yīng)時(shí)間縮短為2.8ms,并且后者對(duì)輸入信號(hào)有很強(qiáng)的快速、精確的跟蹤能力,并針對(duì)兩種控制的仿真曲線進(jìn)行了比較分析。 本文最后是對(duì)壓電式氣動(dòng)伺服閥的研究進(jìn)行了總結(jié),并提出在以后時(shí)間里研究的重點(diǎn)和方向。
[Abstract]:Pneumatic system has a series of advantages, such as no pollution, simple structure, low price and so on, so it is widely used in machinery manufacturing and other industries. In recent years, with the development of piezoelectric materials, the electro-mechanical conversion characteristics of piezoelectric materials are introduced into pneumatic valves. As the electro-mechanical conversion stage of pneumatic valves, the development of pneumatic technology is accelerated. The piezoelectric drive uses the inverse piezoelectric effect of the piezoelectric crystal to form the driving force, and the displacement generated by the piezoelectric crystal has a good linear relationship with the input signal. It is easy to control, and the driving force is large, the load capacity is strong, the power consumption is low, and the response is fast. The pneumatic servo valve can be constructed by replacing the electromagnetic coil as a driving element, which can miniaturize the servo valve and realize the high precision control of the output signal. According to the actual situation, the conciseness and accuracy of the pneumatic servo valve model are considered in a compromise, and some minor factors are ignored, and the essential characteristics of the system can be reflected. The mathematical model of piezoelectric actuated pneumatic servo valve can be simplified. The simulation results of MATLAB and AMEsim show that the piezoelectric pneumatic servo valve has a frequency of 313Hz, a bandwidth of 438Hz and a response time of 3.3ms.It can track the input signal quickly and accurately. The good dynamic characteristics of piezoelectric pneumatic servo valve are verified. By simulating the characteristics of piezoelectric pneumatic servo valve with PID control and PID neural network control, the response time of piezoelectric pneumatic servo valve with PID control is about 3.1 Ms, and the response time of the piezoelectric pneumatic servo valve applying PID neural network controller is about 3.1 ms.After the application of PID neural network controller, the response time of piezoelectric pneumatic servo valve with PID control is obtained. The unit step response time of piezoelectric pneumatic servo valve is shortened to 2.8 Ms, and the latter has very fast and accurate tracking ability to input signal. The simulation curves of the two kinds of control are compared and analyzed. At the end of this paper, the research of piezoelectric pneumatic servo valve is summarized, and the emphasis and direction of the research in the future are put forward.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH138.52

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 吳松濤;全液壓鉛殘極板移載機(jī)械手的數(shù)字樣機(jī)研究[D];昆明理工大學(xué);2012年

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本文編號(hào)：2159592