Combining Leakage and Orifice Flows in a Hydraulic Servovalve Model1-Reference-Cited by-同舟云学术

Combining Leakage and Orifice Flows in a Hydraulic Servovalve Model1

Published:1999-12-17 Issue:3 Volume:122 Page:576-579
ISSN:0022-0434
Container-title:Journal of Dynamic Systems, Measurement, and Control
language:en
Short-container-title:

Author:

Eryilmaz Bora¹,Wilson Bruce H.¹

Affiliation:

1. Department of Mechanical, Industrial, and Manufacturing Engineering, Northeastern University, Boston 02115

Abstract

Experiments indicate that at small servovalve spool displacements, leakage flow between the valve spool and body dominates the orifice flow through the valve. In precision positioning applications, where the servovalve operates within the null region, this flow, if ignored, may severely degrade the performance of a conventional servohydraulic design. We have developed an improved servovalve model that combines both leakage and orifice flow. The model was developed by reviewing experimental leakage flow data and identifying a simple mathematical form that (1) made physical sense and (2) replicated experimental data. When combined with orifice relations, the model extends the accuracy and region of applicability of existing servovalve models. Furthermore, the combined model is easily parameterized using available manufacturer data. [S0022-0434(00)00403-2]

Publisher

ASME International

Subject

Computer Science Applications,Mechanical Engineering,Instrumentation,Information Systems,Control and Systems Engineering

Link

http://asmedigitalcollection.asme.org/dynamicsystems/article-pdf/122/3/576/5653354/567_1.pdf

Reference6 articles.

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2. Ellman, A., and Virvalo, T., 1996, “Formation of Pressure Gain in Hydraulic Servovalves and its Significance in System Behavior,” Proceedings of the ASME Fluid Power Systems and Technology Division, International Mechanical Engineering Congress and Exposition, Atlanta, GA, FPST-3, pp. 77–81.

3. Ellman, A., 1998, “Leakage Behavior of Four-Way Servovalve,” Proceedings of the ASME Fluid Power Systems and Technology Division, International Mechanical Engineering Congress and Exposition, Anaheim, CA, FPST-5, pp. 163–167.

4. Ellman A., Koskinen, K., and Vilenius, M., 1995, “Through-Flow in Short Annulus of Fine Clearance,” Proceedings of the ASME Dynamic Systems and Control Division, International Mechanical Engineering Congress and Exposition, San Francisco, CA, DSC-57, pp. 813–821.

5. Merritt, H. E., 1967, Hydraulic Control Systems, Wiley, New York, NY.

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