A coordinated high-precision hydraulic double-cylinder synchronization system and its control method
A synchronous system and high-precision technology, applied in the direction of fluid pressure actuators, servo motors, mechanical equipment, etc., can solve the problems of low synchronous precision, small application range, limited flow rate of high-speed switching valves, etc., and achieve increased flow rate Adjustment range, high precision of double-cylinder synchronization, and the effect of expanding the application range
Inactive Publication Date: 2017-05-17
PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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[0006] In the above synchronous control method, since the high-speed switching valve is connected in series to the hydraulic oil circuit, and the flow rate of the high-speed switching valve is limited, it will affect the operating state of the hydraulic actuator and reduce the maximum operating speed of the hydraulic actuator. That is to say, this method has the disadvantages of small application range, low synchronization accuracy, and high-speed switching valve has a great influence on the system state.
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[0061] In order to verify the practical feasibility of a coordinated high-precision dual-cylinder synchronous control method based on high-speed switching valves and fuzzy control strategies in the present invention, two methods of simulation and testing are used for verification. Assume that each group of high-speed switching valve group includes two normally closed high-speed switching valves, and the characteristic parameters of the valves and oil are shown in Table 3 and 4.
[0062] Table 3 Parameter list of high-speed switching valve simulation model
[0063] serial number parameter code name unit size 1 Oil density ρ kg / m 3
850 2 Flow Coefficient C d
- 0.67 3 Ball valve diameter D m 0.002 4 Ball valve seat half angle θ deg 20 5 The maximum displacement of the spool x vm
m 0.0013
[0064] Table 4 Switching characteristic parameters of high-speed switching valve
[0065]
[0066] Combined ...
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The invention relates to a closed-loop cooperative type high-precision hydraulic pressure double-cylinder synchronizing system and a control method thereof based on high-speed switch valves and a fuzzy control strategy. The system comprises two hydraulic cylinders provided with displacement sensors, two sets of parallel high-speed switch valve groups, and a fuzzy controller provided with a control strategy in a solidifying manner. The method is characterized in that the advantages of the controllability of figure signals of the high-speed switch valves of the system and average flow rate linear characteristics are utilized, the hydraulic cylinders are synchronously controlled by the fuzzy control strategy solidified in the fuzzy controller, and the duty cycle of digital pulse control signals of the high-speed switch valves is increased or reduced, so as to change the running speed of a fast cylinder. Compared with the prior art, the system and the method have the advantages that the number of the high-speed switch valves can be changed according to actual demands, the requirements of different conditions can be met, the flow regulation range is increased, and the application range is enlarged; adjustment is realized according to actual double-cylinder synchronization precision requirements, the application range is wider, and the double-cylinder synchronization precision is higher; and the organic combination of a computer-control system and a hydraulic system is effectively realized.
Description
[0001] Technical field: [0002] The invention belongs to the technical field of hydraulic transmission and control, and relates to a hydraulic cylinder dual-cylinder synchronous system and its control method, in particular to a closed-loop coordinated high-precision dual-cylinder synchronous system based on a high-speed switching valve and a fuzzy control strategy and its control method . [0003] Background technique: [0004] At present, there are many studies on the synchronous control of two cylinders in the hydraulic system. The commonly used control valve is a proportional directional valve, and the control strategy basically adopts Proportional-Integral-Derivative (PID) control. This control method has little synchronous control effect in practical applications. Good, there is still a large synchronization error between the two cylinders. The synchronous dual-cylinder synchronous control method based on the high-speed switching valve and fuzzy control strategy refers t...
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IPC IPC(8): F15B11/22
Inventor 高钦和杨志勇
Owner PLA SECOND ARTILLERY ENGINEERING UNIVERSITY