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Abstract

The reduction in source flow ripple in hydraulic systems is the most effective method of reducing pump-generated pressure ripple and system noise. This paper describes reductions in axial-piston pump delivery flow ripple achieved using a novel timing mechanism which is inherently speed, flow and pressure sensing.

Fixed-speed tests have shown that the mechanism can significantly reduce axial-piston pump delivery flow ripple over a wide range of delivery pressures and pump displacements. Furthermore, the reduction in pressure ripple achieved with the mechanism has been shown to contribute towards reductions in overall air-borne noise levels of up to 6 dB in a simple system.

A simulation model has been produced to predict the behaviour of the prototype mechanism. The model has been compared with the measured delivery flow ripple and achieves good agreement.

Keywords

fluid power piston pumps fluid-borne noise air-borne noise

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References

Heron

R. A.

Hansford

Airborne noise due to structure borne vibrations transmitted through pump mountings and along circuits. In Proceedings of the IMechE Seminar on

Quiet Oil Hydraulic Systems, London, November 1977, pp. 41–50 (Mechanical Engineering Publications Limited, London).

Hughes

M. L.

Flexural vibrations in rigid pipework due to liquid borne noise. In Proceedings of the IMechE Seminar on

Quiet Oil Hydraulic Systems, London, November 1977, pp. 51–58 (Mechanical Engineering Publications Limited, London).

Quieter Fluid Power Handbook, 1980 (British Hydro-mechanical Research Association, Cranfield).

Rebel

Active liquid noise-suppressions in oil hydraulics (in German). VDI-Z., 1977, 119, 937–943.

Lipscombe

B. R.

The reduction of gear pump pressure-ripple by source flow modification. PhD thesis, School of Engineering, University of Bath, 1986.

Martin

M. J.

Taylor

Optimised port-plate timing for an axial piston pump. In Proceedings of the Fifth International Fluid Power Symposium, Durham, 1978, pp. 51–66.

Edge

K. A.

Lui

Reduction of piston pump pressure ripple. In Proceedings of the Second International Conference on

Fluid Power Transmission and Control, Zejiang University, People's Republic of China, 1989, pp. 779–784.

Boyer

J.J.

Noise reducing device for swash-plate pump has pressure responsive piston to control trapped volume in delivery ports. Pat. 2408050, France, 1980.

10.

Boltyanski

A. D.

Levontin

A.L.

Axial piston pump distributor system has spool valve springless chambers connected to delivery port and valves with varying area slots to reduce noise and vibration. Pat. 1186823, Soviet Union, 1986.

11.

Grahl

Geräuschminderung an Axialkolbenpumpen durch variable Umsteuersysteme (in German). Olhydraulik Pneumatik, 1989, 33 (5), 437–443.

12.

Pettersson

Design of fluid power piston pumps, with special reference to noise reduction. PhD thesis, Division of Fluid Power Technology, Department of Mechanical Engineering, Linköping University, Sweden, 1995.

13.

Pettersson

Weddfelt

Palmberg

J. O.

Reduction of flow-ripple from fluid power machines by means of a pre-compression filter volume. In Proceedings of the Tenth Aachen Colloquium on

Fluid Power Technology, 1992, pp. 181–197.

14.

Helgestad

B. O.

Foster

Bannister

F. K.

Pressure transients in an axial-piston hydraulic pump. Proc. Instn Mech. Engrs, 1974, 188 (17/74), 189–199.

15.

Weddfelt

Pettersson

Palmberg

J. O.

An investigation of the possibilities of using fluidic components in the fluid power area. In Proceedings of FLUCOME ‘94, The 4th Triennial International Symposium on

Fluid Control, Fluid Measurement and Visualization, Toulouse, France, 29 August-1 September 1994, pp. 137–142.

16.

Richards

C. W.

Tilley

D. G.

Tomlinson

S. P.

Burrows

C. R.

A second generation package for fluid power systems. In Proceedings of the Ninth International Fluid Power Symposium, Oxford, 1990, pp. 315–322.

17.

Harris

R. M.

The CAPPA suite: Bathfp model reference guide for computer aided pump performance analysis. Parts 1 and 2. School of Mechanical Engineering Internal Reports, University of Bath, August 1991, August 1992.

18.

Darling

Piston-cylinder dynamics in oil hydraulic piston pumps. PhD thesis, School of Engineering, University of Bath, 1985.

19.

BS ISO 10767–1: 1996(E)

Hydraulic fluid power—determination of pressure ripple levels generated in systems and components, 1st edition, 1996.

Reduction of axial piston pump pressure ripple

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