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Repeatability of Impedance and Ripple Tests for Automotive Pumps
Technical Paper
1999-01-1715
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Pumps are usually tested for performance and efficiency as well as other pump characteristics. With the increased awareness of Noise, Vibration and Harshness (NVH) in the automotive industry, new standardized tests have evolved for testing pumps. Two major tests are the impedance and ripple tests. Information collected on these signatures of pumps is vital for the success of any Fluid Born Noise (FBN) analysis of these important components and the system in which they function.
The purpose of this paper is to study the repeatability and reproducibility of such tests for the same pump. Production variability will be found when pumps of the same ‘category’ or part number are tested. The information presented here is important for the generalization of these tests and establishing them as a part of the research, development and design process. A set of pumps commonly used in the vehicle is put to the test. Another objective of these tests is to show how impedance and ripple tests can be used to describe the quality of the tolerancing practice used in designing and manufacturing these pumps from an NVH viewpoint.
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Qatu, M., Dougherty, M., and Llewellyn, D., "Repeatability of Impedance and Ripple Tests for Automotive Pumps," SAE Technical Paper 1999-01-1715, 1999, https://doi.org/10.4271/1999-01-1715.Also In
References
- ISO “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 Ph.D. Thesis 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 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 172 176 1998
- Qatu, M.S. Dougherty, M.L. Smid, G.E. “Measurement of fluid bulk modulus using impedance of hydraulic circuits” SAE paper No. 99PC-380 Detroit 1999