Research on Flow Press Servo-Valve Controlling Electro-Hydraulic Force Control System and Nonlinear Performance Analysis

Abstract:

The configuration and the work principle of the flow press hydraulic servo-valve was introduced in this paper, based on this and electromagnetic basic theory, the mechanics analysis of every main parts of the flow press hydraulic servo-valve and the liquid basic theory especially the flow continuity equation, the mathematic model of the flow press sever-valve was built, during the process of building the model, the author took into account the load moment brought by the pair of spray nozzles flow force and the load moment brought by the force couples back pole and the fundamental equation of the force moment motor. On the other hand, the author analyzed the influence of the nonlinear factor to system performance, and the nonlinear factor was valve port overlap length disaccord caused by machining error. The mathematic model of the electro-hydraulic force control system controlled by the flow press servo-valve with valve port error was built. The results of simulation and experiment showed that valve port error badly influenced the system performance, and that valve port error was the main reason of the pressure higher than the supply pressure, which is one of the two cylinder cavities. The simulation curve and the experiment curve were accord compared by system simulation and experiment results, so we can know that the mathematic model of the flow press sever-valve and of the electro-hydraulic force control system controlled by the flow press servo-valve is correct.

• Periodical: Applied Mechanics and Materials (Volumes 121-126)
• Pages: 4606-4612
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.121-126.4606
• Online since: October 2011
• Authors: Jian Ying Li, Jun Peng Shao, Xiao Jing Wang, Bai Qin, Yu Jing Qiao
• Keywords: Electro-Hydraulic Force Control System, Experiment, Flow Press Servo Valve, Nonlinear Performance, Simulation, System Model

References

[1] Ch. X. Wang, The Hydraulic Control System. Beijing: Mechanical Industry Press, (2008).

[2] Ch. G. Lu and J L Li, The analysis and design of hydraulic control system. Beijing : China Coal Industry Publishing House, (1991).

[3] L.P. Zh, The Hydraulic Control System and its design. Beijing : Chemical Industry Press, (1997).

[4] Y. Ch. Xu, Fluid Transformation and Control. Shanghai: Tong Ji University Press, (1998).

[5] J. G. Xu and G. Li, Design and dynamic simulation of electro-hydraulic force servo control system, Journal of Su Zhou Institute, vol. 23, pp.111-114, August (2008).

[6] L. Quan, X. Q. Xu, M. Li, Zh. K. Zhang and J. C. Wang, Simulation and test of electro-hydraulic servo position and prussure hybrid control principle,. Chinese Journal of Mechanical Engineering, Vol. 44, pp.100-105, Sep (2008).

DOI: 10.3901/jme.2008.09.100

[7] Y. M. Dai, J. Y. Li and H. Zh. Liu, Application of double valve parallel control in eliminating superfluous force of electrohydraulic load simulator, Machine Tool & Hydraulics, Vol. 35, pp.87-89, Mar (2007).

[8] Y. D. Tian, Numeric simulation and CAD design program of double nozzle baffle force feedback electro hydraulic servo valve, Machine Tool & Hydraulics, Vol. 6, pp.16-22, Jun (1986).