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http://dx.doi.org/10.3795/KSME-A.2003.27.5.789

A New Linearized Equation for Modelling a Servovalve in Hydraulic Control Systems  

Kim, Tae-Hyung (부경대학교 대학원)
Lee, Ill-Young (부경대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.27, no.5, 2003 , pp. 789-797 More about this Journal
Abstract
In the procedure of the hydraulic control system design, a linearized approximate equation described by the first order terms of Taylor series has been widely used. Such a linearized equation is effective just near the operating point, However, pressure and flowrate in actual hydraulic systems are usually not confined near an operating point. This study suggests a new linearized flow equation for a servovalve as a modified form of the conventional linearized flow equation. Subsequently, a procedure to determine effective operating point for the new linearized equation is proposed. From the evaluations of time responses and frequency responses obtained from simulations for a hydraulic control system, the effectiveness of the new linearized equation and the procedure to determine effective operating point is confirmed.
Keywords
Servovalve; Linearization; Operating Point; Hydraulic Control System;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Watton, J., 1990, 'On Linearized Coefficients for an Underlapped Servo-Valve Coupled to a Single-Rod Cylinder,' ASME Journal of Dynamic System, Measurement and Control, Vol. 112, pp. 794-796   DOI
2 Vossoughi R. and Donath, M., 1995, 'Dynamic Feedback Linearization for Electro-Hydraulically Actuated Control Systems,' ASME Journal of Dynamic Systems, Measurement and Control, Vol. 117, pp. 468-477   DOI
3 Axelson, S. and Kumar, K. S. P., 1988, 'Dynamic Feedback Linerization of a Hydraulic Valve-Actuator Combination,' Proc. ACC, Atlanta, GA, pp. 2202-2203
4 Merritt, H. E., 1967, Hydraulic Control Systems, John Wiley & Sons, Inc., pp. 76-173
5 Walters, R. B., 1991, Hydraulic And Electro-Hydraulic Control Systems, Elsevier Applied Science, pp. 55-65
6 Kim, T. H. and Lee, I. Y., 'Error Evaluation of Linearized Equation for a Servovalve in Hydraulic Control Systems,' Trans, of KSME, A, Vol. 27, No. 5, pp. 779-788   과학기술학회마을   DOI
7 Wattom, J., 1989, Fluid Power Systems, Prentice Hall International (UK) Ltd., pp. 43-47
8 Yang, K. U., Oh, I. H. and Lee, I. Y., 1997, 'Pressure Control of Hydraulic Servo System Using Proportional Control Valve,' KSME International Journal, Vol. 13, No. 3, pp. 229-239