The Design of a Novel High Frequency Digital Valve Based on Rotating and Differentially Parallel Control

Abstract:

Due to the ability of the strong anti-interference and directly digital controlling, digital valve has great applications and developing potential in the filed of high frequency response digital servo valve. Base on the rotating structure, a novel high frequency digital valve which can be rotated and controlled in differential parallel way is designed, and the frequency characteristic of electrical signals converting into rotation signals is developed through differential and parallel control of valve spool and valve sleeve. Meanwhile, the hydraulic natural frequency of servo-screw mechanism is further enhanced by the control way of hydraulic half-bridge type A in both chambers of valve spool, and corresponding mathematical model and control block diagram are built. Theoretical analysis concludes that the frequency response characteristic of digital valve is developed significantly. In addition, the multi-gain of rotation angle and axial displacement of valve spool is realized through milling the spiral grooves with different helix angles in the inside of valve sleeve, which improves the flow adaptability of high frequency digital valve effectively. Compared to traditional rotary digital valve, the designed novel digital valve that can be controlled by rotating differentially and parallel has greater advantages in high frequency response and flow adaptability, it provides a new scheme for engineering applications of high frequency digital valve.

• Periodical: Applied Mechanics and Materials (Volumes 602-605)
• Pages: 1317-1323
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.602-605.1317
• Online since: August 2014
• Authors: Heng Du*, Jian Xin Lin, Fan Guo, Chong Ma
• Keywords: Differential Parallel, Digital Valve, High Frequency, Multi-Gain, Servo Screw

References

[1] J. Ruan, X. Pei, S. LI, The 2D electro-hydraulic digital directional valve, Chinese Journal of Mechanical Engineering. 3 (2000) 86-89.

[2] J. P. Bai, J. Ruan, Investigation of cavitation phenomena in valve port of a high frequency electro-hydraulic digital rotary valve, Chinese Journal of Mechanical Engineering 1 (2012) 22-28.

DOI: 10.1109/icma.2010.5589058

[3] Lari Kela, Pekka Vähäoja, Control of an Adjustable Helmholtz Resonator in a Low-Pressure Hydraulic System, International Journal of Fluid Power. 10 (2009) 29-39.

DOI: 10.1080/14399776.2009.10780986

[4] S. Johnny Fu, Mark Liffring, Ishaque S. Mehdi, Integrated electro-hydraulic system modeling and analysis, Aerospace and Electronic Systems Magazine, IEEE. 17 (2002) 4-8.

DOI: 10.1109/maes.2002.1017788

[5] S. Andreas，K. Wolfgang, L. Christoph, K. Andreas. Model-Based Condition Monitoring of an Electro-Hydraulic Valve, Journal of Dynamic Systems, Measurement, and Control. 135 (2013) 061010.

[6] S. Li. Research of key technologies of digital control for 2D servo valve [D]. Zhejiang University of Technology, (2012).