2D数字阀的静动态特性及死区非线性补偿研究

发布时间：2018-05-01 06:29

本文选题：2D数字伺服阀 + 静态特性　；参考：《浙江工业大学》2012年硕士论文

【摘要】：随着电液控制系统的飞速的发展,数字阀作为电液控制系统中的重要组成元件,对其的研究越来越深入了。在国外,数字阀已成为系列化的产品,投入到生产中了,而国内对数字阀的研究起步较晚,技术还很不成熟,因此本论文对2D数字阀的研究,在工程应用中具有重要实际的意义以及理论价值。本论文结合2D数字伺服阀,对其静动态特性进行了实验研究,结果表明,数字阀静态工作时,阀芯转角输入与轴向位移输出基本成线性;在动态工作下,阀的阶跃响应时间最快可达到8.2ms,在最大阀开口25%幅值下正弦信号输入,幅频特性为-3dB对应的频宽约为65Hz。但因数字阀的阀芯同阀口的正遮盖所形成的流量死区,对电液控制系统的性能和精度产生了不利的影响。本论文采用对输入信号叠加颤振的方法,对数字阀的死区非线性进行补偿,建立数字阀控系统的数学模型并对其仿真分析,形成理论的依据,再搭建起实验平台,结果表明,对数字阀的输入叠加高频颤振信号,可以实现对死区非线性的补偿。本文各章内容如下: 第一章,介绍了数字阀的特点;并阐述了国内外对数字阀研究;然后概述了非线性液压系统和电液控制技术;最后列出本课题的研究背景、意义和内容。第二章,对2D数字阀的三维模型的建立采用了基于CATIA环境下的模块化设计。第三章,建立了2D数字阀的数学模型,搭建2D数字阀特性的实验平台,对其静动态特性进行了实验研究。第四章,对死区非线性的特性进行了数学分析,并且分析2D数字伺服阀死区非线性产生的原因,对颤振补偿机理进行简要的分析,建立了2D数学阀控液压缸的数学模型,对接下来的实验做准备。搭建了死区非线性实验平台,对2D数字伺服阀的死区非线性以及其颤振补偿进行了实验的研究。分析实验后得到的数据,得出颤振补偿的实验结论。第五章,针对本论文的研究内容,进行了总结,并对进一步的研究提出展望。
[Abstract]:With the rapid development of electro-hydraulic control system, digital valve, as an important component of electro-hydraulic control system, has been studied more and more deeply. In foreign countries, digital valve has become a series of products, put into production, but the domestic research on digital valve started late, the technology is still immature, so this paper studies 2D digital valve. It has important practical significance and theoretical value in engineering application. In this paper, the static and dynamic characteristics of 2D digital servo valve are studied experimentally. The results show that the valve core angle input and axial displacement output are basically linear when the digital valve works in static state. The step response time of the valve can be up to 8.2 Ms as fast as possible. The sinusoidal signal is input at the maximum opening of 25% amplitude. The amplitude-frequency characteristic of -3dB corresponds to the bandwidth of about 65 Hz. However, the dead zone of flow caused by the positive cover of the valve core and the valve opening of the digital valve has a negative effect on the performance and accuracy of the electro-hydraulic control system. In this paper, the method of superposition flutter of input signal is used to compensate the dead-time nonlinearity of digital valve, and the mathematical model of digital valve control system is established and simulated to form the theoretical basis, and the experimental platform is set up. The high frequency flutter signal can be added to the digital valve to compensate for the dead zone nonlinearity. The chapters of this paper are as follows: In the first chapter, the characteristics of digital valve are introduced, and the research on digital valve at home and abroad is described. Then, the nonlinear hydraulic system and electro-hydraulic control technology are summarized. Finally, the research background, significance and content of this subject are listed. In the second chapter, the 3D model of 2D digital valve is designed based on CATIA. In chapter 3, the mathematical model of 2D digital valve is established, the experimental platform of 2D digital valve is built, and the static and dynamic characteristics of 2D digital valve are studied experimentally. In chapter 4, the characteristics of dead zone nonlinearity are analyzed, and the causes of dead zone nonlinearity of 2D digital servo valve are analyzed, and the mechanism of flutter compensation is briefly analyzed, and the mathematical model of 2D mathematical valve controlled hydraulic cylinder is established. Prepare for the next experiment. The dead zone nonlinearity of 2D digital servo valve and its flutter compensation are studied experimentally. The experimental results of flutter compensation are obtained by analyzing the experimental data. The fifth chapter summarizes the research content of this paper, and puts forward the prospect of further research.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.52

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