대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)

  • 제27권5호
  • /
  • Pages.779-788
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  • 2003
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  • 1226-4873(pISSN)
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  • 2288-5226(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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유압 제어계에서 서보밸브 선형화 방정식의 오차 평가

Error Evaluation of Linearized Equation for a Servovalve in Hydraulic Control Systems

  • 발행 : 2003.05.01
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초록

This study evaluates the approximation errors of the existing linearized equation for a servovalve nonlinear flowrate characteristic. At first, the errors are evaluated on flowrate/pressure characteristics diagrams. Subsequently, they are investigated with time response simulation results for several hydraulic control systems. To enable systematic evaluation of computational error, the authors propose three kinds of equations with restructured forms of the existing linearized equation. As results of the evaluations, it is ascertained that comparatively good computational accuracy can be achieved with the existing linearized equation when both an operating point for the linearized equation and operating range of the hydraulic system stay near the flowrate axis of the flowrate/pressure characteristics diagram. In addition, the results show that comparatively big computational error may occur when operating range of a hydraulic system stay apart from the flowrate axis of the flowrate/pressure characteristics diagram.

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참고문헌

  1. Merrit, H. E., 1967, Hydraulic Control Systems, John Wiley & Sons, Inc., pp. 76-131
  2. Wattom, J., 1989, Fluid Power Systems, Prentice Hall International (UK) Ltd., pp. 43-45
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  4. 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
  5. Japanese Fluid Power Society, 1989, Fulid Power Handbook, Ohm Co., pp. 416-420
  6. Lee, S. R. and Srinivasan, K., 1990, 'SelfTuning Control Application to Closed-Loop Servohydraulic Material Testing,' ASME Journal of Dynamic Systems, Measurement and Control, Vol. 112, pp. 680-689 https://doi.org/10.1115/1.2896195
  7. Yun, J. S. and Cho, H. S., 1991, 'Application of an Adaptive Model Following Control Technique to a Hydraulic Servo System Subjected to Unknown Disturbances,' ASME Journal of Dynamic Systems, Measurement and Control, Vol. 113, pp. 479-486 https://doi.org/10.1115/1.2896435