variables are sensed and fed back by sensitive elements. In some systems, the
optimal reduced-order state variable feedback can shorten the stability time of
the loop.
(4) The role of software
Software is very important for the development of electro-hydraulic control
technology in the future. Hydraulic components or devices with sensors and
two-way communication interfaces can communicate with all other components or devices and the host computer by means of software. The key
parameters of hydraulic components can be stored in a self-contained memory
that can be directly used by computers. Computer simulations and other calculations are performed to determine whether components are compatible with
each other. The host computer can use the inquiry software to inquire about its
setting parameters to the peripheral equipment equipped with a two-way data
transmission line, and then use these parameters to complete the communication protocol, so that users can easily set up new peripheral equipment. Once all
the hydraulic components such as pumps, motors, valves, and cylinders are
equipped with sensors and two-way data transmission lines, the computer can
not only control and monitor the hydraulic machinery through them, but also
give the machine complete self-diagnosis ability. The basic performance and
qualified performance data of hydraulic components are stored in a huge
database in the control/monitoring computer. The computer measures the
current performance of all components at a predetermined time interval and
compares it with the basic performance. If the performance is outside the
qualified window, the computer will give a warning and shut down the machine
when the situation is critical. Full automatic diagnostic ability, i.e., health
diagnosis, is necessary for future machines, because the complexity of
machines is getting higher and higher, and it is impossible to check and troubleshoot machine failures by general means.
(5) Control and eliminate leakage
Leakage is a unique and long-term problem of the hydrodynamic system.
Internal leakage of hydraulic system will lead to waste of energy, reduction of
volume efficiency and mechanical efficiency, and affect the dynamic and static
performance of the system, while external leakage is more concerned, because
it may pollute the environment. Objectively speaking, the scope of leakage is
often extremely limited, which will not bring significant harm to the environment. However, the leakage is an embarrassing thing, which damages the image
of hydraulic technology. Over the years, leakage has been regarded as a topic
related to environmental pollution, and the public’s demand for environmental
cleanliness is increasing. This requires that effective measures be taken to
further reduce or eliminate leakage or eliminate the potential hazards of leakage
fluid within the professional disciplines. These measures include improving
sealing and leak-proof technology, selecting appropriate hydraulic system
pipelines, receiving professional technical training in the maintenance of
hydraulic equipment, developing and using environmentally friendly fluids
9.1 Electro-Hydraulic Servo Control Technology of Aircraft Gas Turbine Pump
55
optimal reduced-order state variable feedback can shorten the stability time of
the loop.
(4) The role of software
Software is very important for the development of electro-hydraulic control
technology in the future. Hydraulic components or devices with sensors and
two-way communication interfaces can communicate with all other components or devices and the host computer by means of software. The key
parameters of hydraulic components can be stored in a self-contained memory
that can be directly used by computers. Computer simulations and other calculations are performed to determine whether components are compatible with
each other. The host computer can use the inquiry software to inquire about its
setting parameters to the peripheral equipment equipped with a two-way data
transmission line, and then use these parameters to complete the communication protocol, so that users can easily set up new peripheral equipment. Once all
the hydraulic components such as pumps, motors, valves, and cylinders are
equipped with sensors and two-way data transmission lines, the computer can
not only control and monitor the hydraulic machinery through them, but also
give the machine complete self-diagnosis ability. The basic performance and
qualified performance data of hydraulic components are stored in a huge
database in the control/monitoring computer. The computer measures the
current performance of all components at a predetermined time interval and
compares it with the basic performance. If the performance is outside the
qualified window, the computer will give a warning and shut down the machine
when the situation is critical. Full automatic diagnostic ability, i.e., health
diagnosis, is necessary for future machines, because the complexity of
machines is getting higher and higher, and it is impossible to check and troubleshoot machine failures by general means.
(5) Control and eliminate leakage
Leakage is a unique and long-term problem of the hydrodynamic system.
Internal leakage of hydraulic system will lead to waste of energy, reduction of
volume efficiency and mechanical efficiency, and affect the dynamic and static
performance of the system, while external leakage is more concerned, because
it may pollute the environment. Objectively speaking, the scope of leakage is
often extremely limited, which will not bring significant harm to the environment. However, the leakage is an embarrassing thing, which damages the image
of hydraulic technology. Over the years, leakage has been regarded as a topic
related to environmental pollution, and the public’s demand for environmental
cleanliness is increasing. This requires that effective measures be taken to
further reduce or eliminate leakage or eliminate the potential hazards of leakage
fluid within the professional disciplines. These measures include improving
sealing and leak-proof technology, selecting appropriate hydraulic system
pipelines, receiving professional technical training in the maintenance of
hydraulic equipment, developing and using environmentally friendly fluids
9.1 Electro-Hydraulic Servo Control Technology of Aircraft Gas Turbine Pump
55