Research On The Static And Dynamic Characteristics Of The 2D Digital Valve And Compensation Of The Dead Zone Nonlinear

With the electro-hydraulic control system rapidly development, digital valve is an integral component of electro-hydraulic control system, its research more deeply. In other countries, the valve has become a series of products into production, while domestic digital valve of a late start, technology is still immature, so this paper on 2D digital valve research has important practical significance and theoretical value in engineering applications.In this paper, the static and dynamic characteristics of the 2D digital servo valve are experimental studied. Experimental results show that, the input of valve angle and the output of axial displacement is linear in static state, and in dynamic working the valve of the fastest step response time can be achieved 8.2ms and 25% of valve opening under the sinusoidal signals, Amplitude-Frequency characteristics correspond to -3dB bandwidth about 65Hz. But plus lap of valve port is to form nonlinearity, it creates adverse affect to function and accuracy of electro-hydraulic control system. On this paper, the input signal is superimposed the flutter signal, so as to compensate the dead zone nonlinearity. Then establish the mathematical model of digital valve control system, and analysis this mathematical models to form the theory basis. Finally, Erected the experimental platform. The results show that the digital valve's input signal which overlays the high-frequency' signal, can compensate for the dead zone nonlinearity. The main tasks of this paper are listed as followed:Chapter 1, First, Describes the characteristics of the 2D digital valve. And described the domestic and international research on the digital valve. Then overview the nonlinear hydraulic system and electro-hydraulic control technology; Finally, listed this paper's context, meaning and content.Chapter 2, Modularized Design of 2D Digital Valve Based on CATIA.Chapter 3, Established a mathematical model of the 2D valve. Then build a Experimental Platform for the 2D digital valve. Last, experimental study the static and dynamic characteristics of 2D digital servo valve.Chapter 4, Using mathematical to analyze the characteristics of the dead zone nonlinear, And analyze the cause of the dead-zone nonlinearity in the 2D digital servo valve. Briefly expound the compensate mechanism. Established a mathematical model of the 2D valve controlling the hydraulic cylinder, so as to prepare for the next experiment. Built a test platform for dead zone nonlinear. Experimental study the characteristics of the dead zone nonlinear in the 2D digital servo valve and flutter compensation. last,obtained experimental results after the analysis of experimental data in this experiment.Chapter 5, the summarization of this dissertation and for further proposed prospects.