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.

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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

Issue

2012: Vol 13 Iss 2

Section

Original Article