Design And Experimental Research On The 2D Digital Servo Valve

With the extensive use of computer technology, the computer-based real-time control has become an important trend for hydraulic (pneumatic) control system. Compared with servo valve or proportion valve, the direct connection between digital valve and computer makes the D/A converter unnecessary. Besides, it also enjoys many other advantages, such as simpler structure, easier to manufacture, lower price, stronger anti-interference and anti-pollution abilities, smaller power requirement, more stable and reliable performance. Some foreign countries have already engaged in the production of series of digital servo valves. In China, however the study of digital servo valve is just underway. Thus the study of this paper is of important theoretical and practical significance.2D digital servo valve (abbreviated as "2D digital servo valve") discussed in this paper consists of a spiral servo mechanism, which simplified the conventional 2D hydraulic valve structure and enjoys great improvement in performance. Due to its closed loop structure, the capabilities of 2D digital servo valve, such as its stability, rapidness, precision and rigidity restrict each other. Effects on the above mentioned performance indexes caused by changes of the structure parameters are neither linear nor identically progressive or degressive . Therefore, in order to improve the comprehensive performance of the 2D digital servo valve, further studies need to be conducted about the relationships between its structure parameters and its static and dynamic features.