压电式气动伺服阀的特性研究
发布时间：2018-08-02 13:33
【摘要】：气动系统具有无污染、结构简单、价格低廉等一系列的优点,因此被广泛应用于机械制造业以及其他各行各业中。近年来,随着压电材料的发展,把压电材料的电—机械转换特性引入到气动阀中,作为气动阀的电—机械转换级,加快了气动技术的发展。压电驱动利用压电晶体的逆压电效应形成驱动力,并且压电晶体产生的位移与输入信号有较好的线性关系,控制方便,产生的驱动力大,带负载能力强,功耗低,响应快,将它作为驱动元件取代电磁线圈来构造气动伺服阀,可以使伺服阀小型化和实现对输出信号的高精度控制。 根据实际情况对气动伺服阀模型的简洁性和精确性进行了折衷的考虑,忽略了一些次要因素,建立了既能反映系统内在本质特性,又能简化分析计算工作的压电驱动式气动伺服阀的数学模型。 本论文通过MATLAB和AMEsim软件仿真分析结果表明：压电气动伺服阀的频率为313Hz,频宽达到438Hz,响应时间为3.3ms,并且能对输入信号进行快速、精确的跟踪,验证了压电气动伺服阀的良好动态特性。 通过对压电气动伺服阀施加PID控制和PID神经网络控制进行特性仿真研究,获得施加PID控制的压电气动伺服阀的响应时间约为3.1 ms,而运用PID神经网络控制器后,压电气动伺服阀的单位阶跃响应时间缩短为2.8ms,并且后者对输入信号有很强的快速、精确的跟踪能力,并针对两种控制的仿真曲线进行了比较分析。 本文最后是对压电式气动伺服阀的研究进行了总结,并提出在以后时间里研究的重点和方向。
[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.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH138.52
本文编号：2159592
[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.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH138.52
【引证文献】
相关硕士学位论文 前1条
1 吴松涛;全液压铅残极板移载机械手的数字样机研究[D];昆明理工大学;2012年
，本文编号：2159592
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