This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
To Improve the Performance of Proportional Valve Controlled Hydraulic Rotary Servo via Nonlinear Compensation
Annotation ability available
Sector:
Language:
English
Abstract
A hydraulic system is inherently nonlinear and sometimes its performance is greatly affected by those nonlinear factors such as deadband, saturation, hysteresis etc. For a system characterized with badly nonlinear behavior, the predominent nonlinearity must be well determined and compensated, otherwise the performance of the system will suffer. As an example, a hydraulic proportional valve controlled rotary motor servo is analyzed in this paper. Through theoretical analysis and experimentation result, a deadband is determined as the predominant nonlinearity in such system and parameters of the deadband are estimated by using system identification method. A nonlinear controller consisting of a linear pole-placement control algorithm and a deadband compensator is designed for the rotary hydraulic system. Experimental results illustrate that such a system controlled by this nonlinear controller exhibits much better overall performance as compared with that controlled by a conventional PI controller. We have also replaced the low-cost proportional valve by a servovalve to verify the overall system performance, which shows that a proportional valve can challenge a servo valve, if a proper nonlinear compensator is designed for the proportional valve.
Recommended Content
Authors
Topic
Citation
Xiong, Y., LeQuoc, S., and Cheng, R., "To Improve the Performance of Proportional Valve Controlled Hydraulic Rotary Servo via Nonlinear Compensation," SAE Technical Paper 941797, 1994, https://doi.org/10.4271/941797.Also In
References
- LeQuoc, S. Xiong, Y.F. Cheng, R.H.M. Identification and Control of Nonlinear Hydraulic System. SAE International Off-Highway & Powerplant Congress & Exposition Paper Series 921622 Milwaukee, Wisconsin 1992
- LeQuoc, S. Cheng, R.M.H. Leung, K.H. Tuning an Electrohydraulic Servo-valve to Obtain High Amplitude Ratio and a Low Resonance Peak. The Journal of Fluid Control 20 3 30 49 1990
- Leung, K.H. Analytical and Experimental Studies of the Open-loop Frequency Response of a Rotary Electro-hydraulic Servo-system M.Eng. Thesis Mechanical Engineering Department, Concordia University 1989
- Astrom, K.J. Wittenmark, B. Adaptive Control Addison - Wesley Publishing Company 1989