With the development of modern science and technology, especially material science, people pay more attention to dynamic experiments. The electro-hydraulic servo technology is the best technical means to achieve dynamic high cycle fatigue, programmed fatigue and low cycle fatigue as well as static constant deformation rate, constant load rate and various simulation test systems. Domestic electro-hydraulic servo testing machine started Foreign test machine counterparts in the electro-hydraulic servo technology and research and development started earlier, since the mid-20th century since the mid-50s has produced a variety of electro-hydraulic servo testing machine, such as the United States MTS, Britain Instron, Switzerland Amsler, Germany Sehench and Japan Shimadzu and other companies have successfully developed a variety of electro-hydraulic servo testing machine. At that time, our country was still blank in this field of application. The electro-hydraulic servo testing machines used were all imported from these countries. China's testing machine manufacturers in the early 1970s began to develop electro-hydraulic servo testing machine, Changchun Institute of Testing Machines, Changchun Machine Factory, Hongshan Machine Factory and Jinan test machine factory began to develop. With the support of national financial resources, we have successfully developed electro-hydraulic servo static and dynamic testing machine and started to apply it in China. It is through the successful practice of that time, train a group of technicians to train and create a platform for the future development of electro-hydraulic servo technology in our country, laying the foundation for this technology in China. Domestic electro-hydraulic servo testing machine development stage Development of domestic electro-hydraulic servo testing machine according to the characteristics of the product development period roughly divided into two stages: the stage of independent development and foreign cooperation and development stage. Independent development stage: Twentieth century, the late 70s to early 90s of the 20th century, the domestic electro-hydraulic servo testing machine are based on independent development. Mainly concentrated in several domestic strength testing machine manufacturers, such as Changchun Institute of Testing Machines, Changchun Machine Factory, Hongshan Machine Factory and Jinan test machine factory and so on. The main representative products of this period are: 1983 Changchun Institute of test machine developed 2000kN electro-hydraulic servo rock pressure testing machine, the device uses high-pressure container as the confining pressure, simulate the real force situation of the sample. Is a three-axis static and dynamic testing machine representative products, and for the first time the computer into the electro-hydraulic servo testing machine control. 1984 Changchun Institute of test machine developed 3000kN electro-hydraulic servo two-cylinder horizontal tensile testing machine. The project for the first time using static pressure support technology, successful in two horizontal servo cylinder hydrostatic support. In addition, the servo synchronization technology is also applied for the first time to realize synchronous tracking and precise positioning of a two-cylinder system. Double-cylinder synchronization accuracy reached 0.03mm. The product marks the domestic hydrostatic support technology and dual-system synchronization technology has matured. 1987 Changchun Institute of Testing Machine developed 1MN electro-hydraulic servo large-scale structural testing machine, which was developed at the time of the largest tonnage of electro-hydraulic servo testing machine. 1986 Changchun Institute of Testing Machine developed a small random electro-hydraulic shaking table. 1985 Changchun test machine factory developed 200kN electro-hydraulic servo static and dynamic testing machine, the first time in China using high pressure toothless chuck and beam prestressed locking technology. Is the standard representative of static and dynamic testing machine products. Hongshan test machine factory over the same period has developed the first pulling torsion electro-hydraulic servo static and dynamic testing machine, for the first time set tension and torsion test in one. The product marks the domestic pull torsion sensor technology, torsion swing cylinder technology and pull torsion synthesis test technology has begun to apply. This period of development and production of electro-hydraulic servo testing machine's technical features are: In the measurement and control system, with the development of digital circuit technology and computer technology, it began to develop from analog control to analog-digital hybrid control and began to apply computer technology to the control system. The servo synchronization technology is applied to realize the synchronous tracking and precise positioning of the two-cylinder system. Developed a low damping, high response, long life hydrostatic support dynamic servo cylinder. The use of booster technology to achieve high-pressure toothless chuck and beam prestressed locking. The technical characteristics of these products at the time of the development of electro-hydraulic servo technology, are more advanced. Cooperation and development stage with foreign countries: In the 1990s, with the acceleration of China's reform and opening up, the links between domestic testing machine manufacturers and their foreign counterparts became closer. Both sides began to seek ways of cooperation for their respective interests. In the meantime, Changchun Testing Machine Co., Ltd. formally signed a technical cooperation agreement with MTS Company of the United States in 1989 and entered into substantive implementation stage in 1993. In addition, the Changchun Testing Machine Factory began technical cooperation with the United Kingdom Tattech Company, the Jinan Testing Machine Factory and Japan's Shimadzu, and the Hongshan Testing Machine Factory contacted the British company Instron during the same period. In short, this period is the period when several major pilot machine factories in China are seeking cooperation with foreign countries. This period of the electro-hydraulic servo testing machine product varieties is the most complicated; domestic products with independent property rights, the introduction of technical cooperation in the production of products, as well as foreign technology domestic production of products. The testing machine manufacturers products represent the characteristics of their respective manufacturers, testing machine in the domestic market started a contest. After entering the domestic testing machine industry and international cooperation and development period, in the face of foreign advanced technology, but did not forget to improve their own technology. In this regard, many outstanding domestic enterprises have always insisted walking on two legs. On the one hand, it is bold to introduce advanced foreign technologies and take the road of technical cooperation. On the other hand, it draws on advanced technologies and continuously improves and improves its products with independent intellectual property rights. It has also boosted its own products with advanced foreign technologies. With the maturity of electro-hydraulic servo technology, the domestic testing machine manufacturers using electro-hydraulic servo technology began to move from a simple material test to a wider range of multi-application test direction. For example, Changchun Tester Research Institute developed the first "Electro-hydraulic Servo Axis 4-Cylinder Test Machine" and "Electro-Hydraulic Servo Microscope Test Machine" developed in the field of new material research to solve the special needs in the domestic material research field, Domestic blank; for the field of automotive parts testing developed "electro-hydraulic servo shock absorber performance and fatigue test bed", "electro-hydraulic servo steering wheel performance and fatigue test stand", "electro-hydraulic servo torsion fatigue testing machine" and "X- -Y Electro-hydraulic Servo Biaxial Shaker "and so on. In this period of development and production of electro-hydraulic servo testing machine features: Domestic electro-hydraulic servo testing machine variety, not only enriched the market of domestic electro-hydraulic servo testing machine, but also improve the level of independent product technology. Electro-hydraulic servo technology in experimental applications have been expanded. In the development of faster foreign monitoring and control system, the United States MTS company's controller, for example, mixed analog controllers MTS458 and MTS407 will gradually be full digital controller TeststarII, SE and multi-channel GT replaced. With respect to the domestic measurement and control system, with the development of single-chip microcomputer technology and computer technology, the development of bus-based and templated technologies has started and the proportion of computers in the system has been gradually raised. In servo coordination control technology breakthroughs, the use of the technology successfully developed the first domestic "electro-hydraulic servo four-cylinder four-cylinder testing machine," the center of positioning accuracy of less than 0.03mm. Host servo cylinder hydrostatic support on the basis of the development of dynamic pressure support cylinder. Technical comparison with other foreign testing machines The development of domestic electro-hydraulic servo testing machine has made great strides in the past three decades. However, compared with the counterparts of foreign testing machines, there is still a big gap between the MTS Company in the United States and Instron in the United Kingdom, Is in the field of high-tech test applications can not compete with foreign counterparts. Both in terms of technical means and product varieties are there is a big gap. Here are several major aspects of comparison instructions: We MTS company's products and domestic Changchun Institute of testing machine make a contrast. In the mid-1990's, MTS introduced the Teststar II digital controller and introduced digital controllers such as the SE and multi-channel GTs to the market. These control systems have complete functions, flexible resource allocation, convenient combination, wide adaptability and high performance indexes. The highest frequency of MTS electro-hydraulic servo testing machine can reach 1000Hz at present, which is an order of magnitude higher than the frequency of domestic electro-hydraulic servo test. The increase of frequency involves a series of technological upgrading links, which not only reflect the response speed of the control system, but also the response speed of the corresponding components such as the host actuator, servo valve and hydraulic source all affect the frequency of the whole machine. so
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Electro-hydraulic servo system has many advantages, among which the most outstanding ones are the fast response, large output power and high control accuracy. Therefore, it has been widely used in the fields of aviation, aerospace, military, metallurgy, transportation and construction machinery. Although the human use of hydraulic machinery and hydraulic transmission has a long history, but the rapid development of hydraulic control technology is still in recent decades, with the birth of electro-hydraulic servo valve, hydraulic servo technology into the era of electro-hydraulic servo , Its application has also been widely expanded.