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Measurement of Fluid Bulk Modulus Using Impedance of Hydraulic Circuits
Technical Paper
1999-01-0942
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Certain properties of fluid change with pressure, temperature and other operating system conditions. In automotive hydraulic systems driven by pumps, air usually enters the system as dissolved matter or very small bubbles. Such air will change certain properties of the fluid like the density, bulk modulus and viscosity. Measuring these properties for evaluating system performance in real operating conditions is one of the big challenges that face engineers.
In this paper, the bulk modulus of certain power steering fluids is measured using standard impedance and flow ripple tests for pumps. The effects of pressure, temperature and speed on the bulk modulus are studied thoroughly.
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Citation
Qatu, M., Dougherty, M., and Smid, G., "Measurement of Fluid Bulk Modulus Using Impedance of Hydraulic Circuits," SAE Technical Paper 1999-01-0942, 1999, https://doi.org/10.4271/1999-01-0942.Also In
References
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- “Hydraulic Fluid Power - Determination of Pressure Ripple Levels Generated in Systems and Components - Part 1: Precision Method for Pumps.”
- Drew, J.E. The use of flexible hose to reduce pressure ripple in Power Steering University of Bath 1997
- Johnston, D.N. Edge, K.A. “The impedance characteristics of fluid power components: transfer matrix characteristics of two-port hydraulic components.” ASME Winter Annual Meeting Chicago Nov. 1994
- Kojima, E. Edge, K.A. “Experimental determination of hydraulic silencer matrices and assessment of the method for use as a standard test procedure.” 7th Bath International Fluid Power Workshop Bath Sept 1994
- Smid, G.E. Qatu, M.S. Dougherty, M.L. “Optimizing the Power Steering Components to Attenuate Noise and Vibrations,” Proceedings of the 1998 European Conference on Vehicle Noise and Vibration 103 112 U.K.
- Dougherty, M.L. Qatu, M.S. Smid, G.E. “A Novel Process For Attenuating Noise In Hydraulic Circuits,” 4 th Chrysler Quality and Reliability Symposium 1998