A MODIFIED TURBULENT ORIFICE EQUATION APPROACH FOR MODELLING VALVES OF UNKNOWN CONFIGURATION

Authors

  • Jeff Dobchuk Convergent Motion Control, Inc., Saskatoon, Saskatchewan
  • Richard Burton Department of Mechanical Engineering, University of Saskatchewan
  • Peter Nikiforuk Department of Mechanical Engineering, University of Saskatchewan

Keywords:

orifice, modelling

Abstract

Motion control of valve controlled hydraulically actuated systems may be improved by compensating directly for the nonlinear relationship between valve displacement, differential pressure across the valve and the flow rate. In this paper a method is described in which such a relationship can be obtained from a relatively small experimental data set for a valve with an orifice of unknown configuration through the application of a modified discharge coefficient in the turbulent orifice equation.

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Author Biographies

Jeff Dobchuk, Convergent Motion Control, Inc., Saskatoon, Saskatchewan

Jeff Dobchuk Jeff received his PhD in Mechanical Engineering at the University of Saskatchewan in 2004. Since then, he has been employed in industry with Convergent Motion Control, Inc in Saskatoon and most recently as a contract employee with John Deere. He remains active in applying innovative control strategies to hydraulic and motion control problems

Richard Burton, Department of Mechanical Engineering, University of Saskatchewan

Richard Burton Richard Burton received his PhD, and MSc degrees in Mechanical Engineering from the University of Saskatchewan. He is a professor of Mechanical Engineering at the University of Saskatchewan, has professional engineering status (P.Eng) with the Association of Professional Engineers of Saskatchewan and is a Fellow of ASME. Burton is involved in research pertaining to the application of intelligent theories to control and monitoring of hydraulics systems, component design, and system analysis.

Peter Nikiforuk, Department of Mechanical Engineering, University of Saskatchewan

Peter Nikiforuk Professor Emeritus, Dr Nikiforuk received a B.Sc. in engineering physics from Queen’s University in Kingston in 1952, a Ph.D. in 1955, and a D.Sc. in 1970 for his research on control systems from Manchester University in England. After four years in industry, in January 1960, he joined the University of Saskatchewan as an assistant professor in the Department of Mechanical Engineering. He was appointed Head of the Department of Mechanical Engineering in 1966 and Dean of Engineering in 1973, a position held until 1996. During his tenure at the University of Saskatchewan he was the supervisor or cosupervisor of 90 M.Sc. and Ph.D graduates and about 20 postdoctoral fellows and visiting professors. He is the author or co-author of approximately 390 technical papers and chapters in books. He was elected Fellow of seven Societies, three British and four Canadian, and the recipient of six medals and five other awards. His research interests involve control systems and their application to physical systems.

References

Andersson, J. 2001. Multiobjective Optimization In

Engineering Design: Applications to Fluid Power

Systems. PhD thesis. Linkoping University, Linkoping,

Sweden.

Borghi, M. and Cantore, G. 1998. Analysis of Hydraulic

Components using Computational Fluid

Dynamics Models. Proceedings of the Institute of

Mechanical Engineers, V212 Part C, pp. 619.

Ellman, A. and Piche, R. 1996. A Modified Orifice

Flow Formula for Numerical Simulation of Fluid

Power Systems. Fluid Power Systems and Technology,

ASME, Vol. 3, pp. 59-63.

Gromala, P. 2002. Research on Pressure Drop in Hydraulic

Components by Means of CFD Method on

Example of Control Valve. Proceedings of the 2nd

International FPNI PhD Symposium on Fluid

Power, Modena, Italy.

Merritt, H. E. 1967. Hydraulic Control Systems, John

Wiley & Sons, Inc, New York.

Miller, R. W. 1996. Flow Measurement Engineering

Handbook. 3rd, McGraw-Hill, New York.Nelder, J. A. and Mead, R. 1965. A Simplex Method

for Function Minimization. The Computer Journal,

V7 I4, pp. 308-313.

Romanchuk, B. G. 1995. Input-Output Analysis of

Feedback Loops with Saturation Nonlinearities.

PhD thesis. Cambridge University.

Thoma, J. 1970. Modern Oilhydraulic Engineering.

Trade & Technical Press LTD.

Vescovo, G. D. 2002. Flow Forces Analysis on a Fourway

Valve. Proceedings of the 2nd International FPNI

PhD Symposium on Fluid Power, Modena, Italy.

Viall, E. and Zhang, Q. 2000. Spool Valve Discharge

Coefficient Determination. Proceedings of 48th National

Conference on Fluid Power, Milwaukee,

Wisconsin, USA, pp. 491.

Wu, D., Burton, R. and Schoenau G. 2002. An Empirical

Discharge Coefficient Model for Orifice

Flow. International Journal of Fluid Power, FPN

Volume 3, No. 3, pp. 13-18.

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Published

2007-11-01

How to Cite

Dobchuk, J., Burton, R., & Nikiforuk, P. (2007). A MODIFIED TURBULENT ORIFICE EQUATION APPROACH FOR MODELLING VALVES OF UNKNOWN CONFIGURATION. International Journal of Fluid Power, 8(3), 25–30. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/535

Issue

2007: Vol 08 Iss 3

Section

Original Article