and hydraulic cylinders appeared. In the early nineteenth century, hydraulic technology made some significant progress, including the use of oil as a working
medium and the use of electricity to drive direction control valves.
In the 1940s and 1950s, the development of electro-hydraulic control technology
was accelerated. Two-stage electro-hydraulic servo valve, nozzle baffle element,
and feedback device are all products of this period. In the 1950s and 1960s, the
development of electro-hydraulic components and technology was at their peak.
Electro-hydraulic servo control technology played an important role in military
applications, especially in aviation and aerospace applications. These applications
include radar drive, guidance platform drive, and missile launcher control at first,
and then extend to missile flight control, radar antenna positioning, aircraft flight
control system stability, dynamic adjustment of radar magnetron chamber, and
thrust vector control of aircraft. Electro-hydraulic servo actuator is used for navigation and control of space launch vehicle. The application of electro-hydraulic
control technology in nonmilitary industry is more and more, mainly used in the
machine tool industry. The electro-hydraulic system is used in the positioning servo
device of numerically controlled machine tool, and the hydraulic servo motor is
used instead of manual operation. Secondly, it is used in construction machinery. In
the following decades, the industrial application of electro-hydraulic control technology has been further extended to industrial robotic control, plastic processing,
geological and mineral exploration, gas or steam turbine control, and automation of
mobile equipment. The application of electro-hydraulic servo control in the field of
experiment is the direct result of the influence of military application on nonmilitary
application.
There are many achievements in the development of electro-hydraulic servo
control devices, such as servo valves with pressure feedback, redundant servo
valves, three-stage servo valves, and servo actuators. Electro-hydraulic proportional
control technology and proportional valve appeared in the late 1960s and early
1970s. Proportional valves are designed to reduce costs, usually the cost of proportional valves is only a fraction of that of servo valves. The performance of
proportional valve is inferior to that of the servo valve, but advanced control
technology and electronic device makes up for the inherent deficiencies of proportional valve, and makes its performance and efficiency close to that of servo
valve. The rapid development of electronic technology and devices has promoted
the evolution of electro-hydraulic control technology. In the 1970s, the advent of
integrated circuits and the birth of microprocessors endowed machines with
mathematical computing and processing capabilities. The electronic (microelectronic) devices and devices consisting of integrated circuits are small in size but
have high output power, strong signal processing capability, excellent reproducibility and stability, and low in price. With the support of such electronic
(microelectronic) control devices, electro-hydraulic control technology is moving to
a new height.
52
9 High-Temperature and High-Speed Gas Turbine Pump …
medium and the use of electricity to drive direction control valves.
In the 1940s and 1950s, the development of electro-hydraulic control technology
was accelerated. Two-stage electro-hydraulic servo valve, nozzle baffle element,
and feedback device are all products of this period. In the 1950s and 1960s, the
development of electro-hydraulic components and technology was at their peak.
Electro-hydraulic servo control technology played an important role in military
applications, especially in aviation and aerospace applications. These applications
include radar drive, guidance platform drive, and missile launcher control at first,
and then extend to missile flight control, radar antenna positioning, aircraft flight
control system stability, dynamic adjustment of radar magnetron chamber, and
thrust vector control of aircraft. Electro-hydraulic servo actuator is used for navigation and control of space launch vehicle. The application of electro-hydraulic
control technology in nonmilitary industry is more and more, mainly used in the
machine tool industry. The electro-hydraulic system is used in the positioning servo
device of numerically controlled machine tool, and the hydraulic servo motor is
used instead of manual operation. Secondly, it is used in construction machinery. In
the following decades, the industrial application of electro-hydraulic control technology has been further extended to industrial robotic control, plastic processing,
geological and mineral exploration, gas or steam turbine control, and automation of
mobile equipment. The application of electro-hydraulic servo control in the field of
experiment is the direct result of the influence of military application on nonmilitary
application.
There are many achievements in the development of electro-hydraulic servo
control devices, such as servo valves with pressure feedback, redundant servo
valves, three-stage servo valves, and servo actuators. Electro-hydraulic proportional
control technology and proportional valve appeared in the late 1960s and early
1970s. Proportional valves are designed to reduce costs, usually the cost of proportional valves is only a fraction of that of servo valves. The performance of
proportional valve is inferior to that of the servo valve, but advanced control
technology and electronic device makes up for the inherent deficiencies of proportional valve, and makes its performance and efficiency close to that of servo
valve. The rapid development of electronic technology and devices has promoted
the evolution of electro-hydraulic control technology. In the 1970s, the advent of
integrated circuits and the birth of microprocessors endowed machines with
mathematical computing and processing capabilities. The electronic (microelectronic) devices and devices consisting of integrated circuits are small in size but
have high output power, strong signal processing capability, excellent reproducibility and stability, and low in price. With the support of such electronic
(microelectronic) control devices, electro-hydraulic control technology is moving to
a new height.
52
9 High-Temperature and High-Speed Gas Turbine Pump …