MEASURING AND MODELLING HYDRAULIC FLUID DYNAMICS AT HIGH PRESSURE – ACCURATE AND SIMPLE APPROACH

Authors

  • Juho-Pekka Karjalainen Tampere University of Technology (TUT), Department of Intelligent Hydraulics and Automation (IHA). P.O.Box 589, FIN-33101, Tampere, Finland
  • Reijo Karjalainen Tampere University of Technology (TUT), Department of Intelligent Hydraulics and Automation (IHA). P.O.Box 589, FIN-33101, Tampere, Finland
  • Kalevi Huhtala Tampere University of Technology (TUT), Department of Intelligent Hydraulics and Automation (IHA). P.O.Box 589, FIN-33101, Tampere, Finland

Keywords:

adiabatic, bulk modulus, density, dynamics, high-pressure, hydraulic fluid, isothermal, measuring, modelling, second order polynomial, speed of sound

Abstract

Dynamic properties of hydraulic fluids have to be taken into account in ever increasing fluid power applications. The main reasons are increasing accuracy demands in control and modelling, as well as increasing operating pressure and temperature ranges. Moreover, the already wide spectrum of different hydraulic fluids is also expanding all the time. However, information on dynamic hydraulic fluid behavior is still very difficult to be obtained. On the other hand, existing fluid models tend to be either too inaccurate, or at least highly non-generic for most practical applications. This article introduces simple, yet accurate approaches for measuring and predicting the most important dynamic fluid parameters: bulk modulus, density and speed of sound in fluid. The methods are basically applicable to any standard hydraulic fluid, without any extra system-related constraints, at least at the presented conditions. The studied pressure range reaches 1500 bar, and the temperatures cover a normal operating range of industrial applications. Examples of both measured and predicted results for selected commercial hydraulic fluids are given. The results have also been found to be in excellent agreement with existing reference data.

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Author Biographies

Juho-Pekka Karjalainen, Tampere University of Technology (TUT), Department of Intelligent Hydraulics and Automation (IHA). P.O.Box 589, FIN-33101, Tampere, Finland

Juho-Pekka Karjalainen Born in August 1978. Received his Dr. Tech. degree from Tampere University of Technology (Finland) in 2011. He is currently working as a research fellow in the Department of Intelligent Hydraulics and Automation (IHA) of the university. His primary research fields are hydraulic fluid dynamics, different hydraulic fluid types and fluid effects on fluid power applications.

Reijo Karjalainen, Tampere University of Technology (TUT), Department of Intelligent Hydraulics and Automation (IHA). P.O.Box 589, FIN-33101, Tampere, Finland

Reijo Karjalainen Born in February 1952. Received his Lic. Tech. degree from Tampere University of Technology (Finland) in 1996. He is currently working as a laboratory manager in the Department of Intelligent Hydraulics and Automation (IHA) of the university. His primary research fields are testing and analysis of different hydraulic fluid types and different test equipment designs for fluid power applications.

Kalevi Huhtala, Tampere University of Technology (TUT), Department of Intelligent Hydraulics and Automation (IHA). P.O.Box 589, FIN-33101, Tampere, Finland

Kalevi Huhtala Born in August 1957. Received his Dr. Tech. degree from Tampere University of Technology (Finland) in 1996. He is currently working as a professor in the Department of Intelligent Hydraulics and Automation (IHA) of the university. He is also head of department. His primary research fields are intelligent mobile machines and diesel engine hydraulics.

References

ASTM-D6793-02. 2002. Standard Test Method for

Determination of Isothermal Secant and Tangent

Bulk Modulus. USA: ASTM. (5 p.)

ASTM/IP. Petroleum Measurement Table 53.

Beyer, T. 1998. The Measurement of Diesel Fuel

Properties at High Pressure. M.Sc.(Tech.) thesis.

Georgia Institute of Technology. USA. (141 p.)

Borghi, M., Bussi, C., Milani, M. and Paltrinieri, F.

A Numerical Approach to the Hydraulic Fluids

Properties Prediction. Proceedings of SICFP‘03,

pp. 715 - 729. Tampere University of Technology.

Finland.

Garbacik, A. and Stecki, J. S. 2000. Developments in

Fluid Power Control of Machinery and Manipulators.

Fluid Power Net publication, pp. 227 - 257.

Gholizadeh, H., Burton, R. and Schoenau, G. 2011.

Fluid Bulk Modulus: A Literature Survey. International

Journal of Fluid Power, Vol. 12, No. 3, pp.

- 15.

Hodges, P. 1996. Hydraulic Fluids. London: Arnold.

(167 p.)

ISO 15086-2:2000. 2000. Hydraulic Fluid Power Determination

of the Fluid-borne Noise Characteristics

of Components and Systems -Part 2 (27 p.)

Johnston, D. N. and Edge, K. A. 1991. In-situ Measurement

of the Wavespeed and Bulk Modulus in

Hydraulic Lines. Proc.I.Mech.E., Part 1, Vol. 205,

pp 191 - 197.

Karjalainen, J. - P., Karjalainen, R., Huhtala, K.

and Vilenius, M. 2005. The Dynamics of Hydraulic

Fluids – Significance, Differences and Measuring.

Proceedings of PTMC 2005, pp. 437 - 450. University

of Bath. UK.

Karjalainen, J. - P., Karjalainen, R., Huhtala, K.

and Vilenius, M. 2006. High-pressure Properties of

Hydraulic Fluids – Measuring and Differences.

Proceedings of PTMC 2006, pp. 67 - 79. University

of Bath. UK.

Karjalainen, J. - P., Karjalainen, R., Huhtala, K.

and Vilenius, M. 2007. Fluid Dynamics – Comparison

and Discussion on System-related Differences.

Proceedings of SICFP’07, pp. 371 - 381.

Tampere University of Technology. Finland.

Karjalainen, J. - P., Karjalainen, R., Huhtala, K.

and Vilenius, M. 2009. Second Order Polynomial

Model for Fluid Dynamics in High Pressure. Proceedings

of ASME DSCC 2009. Hollywood, CA.

USA. (7 p.)

Karjalainen, J. - P., Karjalainen, R., Huhtala, K.

and Vilenius, M. 2011a. Comparison of Measured

and Predicted Dynamic Properties of Different

Commercial Hydraulic Fluids. Proceedings of

SICFP ’11, pp. 281 - 295. Tampere University of

Technology. Finland.

Karjalainen, J. - P. 2011b. High-Pressure Properties of

Hydraulic Fluid Dynamics and Second Order Polynomial

Prediction Method. Dr.(Tech.) thesis. Tampere

University of Technology. Finland. (164 p.)

Kojima, E. and Yu, J. 2000. Methods for Measuring

the Speed of Sound in the Fluid in Fluid Transmission

Pipes. SAE Technical Paper 2000-01-2618.

Society of Automotive Engineering, Inc. (10 p.)

Kuss, E. 1976. pVT-Daten bei hohen Drücken.

DGMK- Forschungsbericht, 4510/1975. (69 p. +

appendixes)

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

USA: John Wiley & Sons Inc. (358 p.)

Smith, jr. L. H., Peeler, R. L. and Bernd, L. H. 1960.

Hydraulic Fluid Bulk Modulus – Its Effect on System

Performance and Techniques for Physical

Measurement. NFPA Publication. (19 p.)

Yu, J., Chen, Z. and Lu, Y. 1994. The Variation of Oil

Effective Bulk Modulus with Pressure in Hydraulic

Systems. Transactions ASME, Journal of Dynamic

Systems, Measurement & Control, Vol. 116, pp.

- 150.

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Published

2018-12-30

How to Cite

Karjalainen, J.-P., Karjalainen, R., & Huhtala, K. (2018). MEASURING AND MODELLING HYDRAULIC FLUID DYNAMICS AT HIGH PRESSURE – ACCURATE AND SIMPLE APPROACH. International Journal of Fluid Power, 13(2), 51–59. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/237

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Original Article