Pressure pulsations generated by pumps and motors can often be a major source of noise in hydraulic systems. In this paper two test methods for the determination of the pressure ripple characteristics of pumps are described. The first method enables a pump to be characterized by a frequency spectrum or a single figure or merit, enabling simple comparisons to be drawn between units. Typical results are presented and discussed. The second test method enables pump characteristics to be defined in more detail. This provides useful information for designers. The method also has the ability to provide information on the pressure ripple characteristics of valves. Typical results are again presented.
Get full access to this article
View all access options for this article.
References
1.
Code of practice for reducing the exposure of employed persons to noise. Department of Employment, HMSO, 1972.
2.
Protection of hearing at work: content of proposed regulations and draft approved code of practice and guidance note. HMSO Consultative Document, 1981.
3.
RayleighLordThe theory of sound, Vol. II, Dover Publications, 1945 (1st edition 1877).
4.
ConstaninescoG.Theory of wave transmission, a treatise on transmission of power by vibration, Walter Haddon, 1922.
5.
WallerE.Fundamental analysis of unsteady pressure variations in pipe line systems. Oklahoma Engineering Experimental Station, Pub. No. 92, 1954.
6.
BrownF.Transient response of fluid lines. J. Basic Engng. Paper No. 61-WA-143, 1962.
7.
WillekinsF.Fluid borne noise in hydraulic systems. 1st European Fluid Power Conference, East Kilbride, Scotland, 1973.
8.
D'SouzaA.OldenburgerR.Dynamic response of fluid lines. J. Basic Engng., Sept. 1964.
BS6335: Part 1, 1983. Methods for determining pressure ripple levels generated in hydraulic fluid power systems and components. Part 1: high impedance method for pumps. British Standards Institution, 1983.
15.
HelgestadB.FosterK.BannisterF.Pressure transients in an axial piston hydraulic pump. Proc. Instn. Mech. Engrs, 1974, 188, 189.
