Modelling of the influence of entrained and dissolved air on the performance of an oil-hydraulic capacity

Authors

  • Katharina Schmitz Institute for Fluid Power Drives and Controls, RWTH Aachen University, Steinbachstr. 53, 52074 Aachen, Germany
  • Hubertus Murrenhoff Institute for Fluid Power Drives and Controls, RWTH Aachen University, Steinbachstr. 53, 52074 Aachen, Germany

DOI:

https://doi.org/10.1080/14399776.2015.1110094

Keywords:

entrained air, dissolved air, air mass transfer, lumped parameter simulation, bulk modulus

Abstract

Fluids used in fluid power systems to transmit power and energy seldom consist of pure oil due to a large number of impurity sources. Especially impurities in form of air bubbles highly change the system behaviour with respect to stiffness and efficiency. The aim of this paper is to provide a mathematical model to simulate the effect of air on the pressure build-up and release in an oil-hydraulic capacity. Therefore, first a model to calculate the mass transfer between dissolved and entrained air is presented. In the end, the new developed model is validated with measurements.

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Author Biographies

Katharina Schmitz, Institute for Fluid Power Drives and Controls, RWTH Aachen University, Steinbachstr. 53, 52074 Aachen, Germany

Katharina Schmitz (Nee Schrank) studied Mechanical Engineering at RWTH Aachen University and Carnegie Mellon University from 2005 to 2010. Since September 2010 she is a member of the scientific staff at the Institute for Fluid Power Drives & Controls (IFAS) at RWTH Aachen University.

Hubertus Murrenhoff, Institute for Fluid Power Drives and Controls, RWTH Aachen University, Steinbachstr. 53, 52074 Aachen, Germany

Hubertus Murrenhoff is director of the Institute for Fluid Power Drives & Controls (IFAS) at RWTH Aachen University. Main research interests cover hydraulics and pneumatics including components, systems, controls, simulation programs and the applications of fluid power in mobile and stationary equipment.

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Published

2015-11-01

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