Flow characteristics of a trochoidal-gear pump using bond graphs and experimental measurement. Part 1

Abstract

The current paper presents an extensive study aimed at trochoidal-gear pumps. In recent years their important application in the automotive industry, where trochoidal-gear pumps are increasingly in use, has encouraged work to enhance a better understanding of their characteristics and performance. To different extents, geometry and kinematics of trochoidal profiles and volumetric characteristics are considered. The bond graph technique is applied to model a trochoidal-gear pump based upon an ideal representation in order to simulate the instantaneous flow. The frequent intricate aspects of leakage have been deliberately left aside in this part 1 of the present paper. Nevertheless, leakage and interaction of the flow inside the pump will be presented in part 2 of this paper. The experimental determination of the flow ripple of a crankshaft-mounted gerotor pump for IC engine lubrication is also considered. A convenient method of experimentally measuring the so-called ‘secondary source’ method is presented. The method is based on the analysis of the wave propagation characteristics in a circuit which includes the pump under test and an additional source of fluid-borne noise. In addition to allowing investigation of the flow characteristics through simulation and experimental measurement, which obtains interesting results, this study also provides a way of obtaining the dynamic properties of trochoidal-gear pumps under realistic conditions for use in further studies for modelling more complex hydraulic components.

Keywords

trochoidal profiles bond graphs flow ripple

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References

Ansdale

R. F.

Lockley

D. J.

The Wankel RC engine design and performance, 1968 (London Iliffe Books, London).

Colbourne

J. R.

The geometry of trochoid envelopes and their application in rotary pumps

Mechanism Machine Theory, 1974, 9, 421–435.

Robinson

F. J.

Lyon

J. R.

An analysis of epitrochoidal profiles with constant difference modification suitable for rotary expanders and pumps

J. Engng Ind. ASME Trans., 1976, 161–165.

Shung

J. B.

Pennock

G. R.

Geometry for trochoidal-type machines with conjugate envelopes

Mechanism Machine Theory, 1994, 29 (1), 25–42.

Mimmi

Pennacchi

Rotor design and optimization in internal lobe pumps

In the 5th Pan-American Congress of Applied Mechanics, January 1997, 50 (11), pp. 133–141.

Stryczek

Hydraulic machines with cycloidal gearing

Archiwum Budowy Maszyn, 43, 43.

Dasgupta

Mukherjee

Maiti

Theoretical and experimental studies of the steady state performance of an orbital rotor low-speed high-torque hydraulic motor

Proc. Instn Mech. Engrs, Part A: J. Power and Energy, 1996, 210 (A6), 423–429.

Fabiani

Mancò

Nervegna

Rundo

Armenio

Pachetti

Trichilo

Modelling and simulation of gerotor gearing in lubricating oil pumps

SAE Trans, J. Engines, 1999, 108 (3), 989–1003.

Mancò

Nervegna

Rundo

Armenio

Pachetti

Trichilo

Gerotor lubricating oil pump for IC engines. SAE paper 982689, 1998, pp. 1–17.

10.

Mancò

Nervegna

Rundo

A contribution to the design of hydraulic lube pumps

Int. J. Fluid Power, 2002, 3 (1), 1–11.

11.

Davidson

L. C.

The internal impedance of the impedance of positive displacement pumps. In the Conference on Noise and fluids engineering (ASME), Atlanta, 1997, pp. 225–231.

12.

Viersma

T. J.

Analysis synthesis and design of hydraulic servosystems and pipeline, 1980 (Elsevier, Amsterdam).

13.

Edge

K. A.

The theoretical prediction of the impedance of positive displacement pumps

Institution of Mechanical Engineers, London, 1980, Paper C387/80, pp. 95–103.

14.

Edge

K. A.

Tilley

D. G.

The use of plane wave theory in the modelling of pressure ripples in hydraulic systems

Trans. Inst. Measmt Control, 1983, 5 (4), 171–178.

15.

Edge

K. A.

Johnston

D. N.

A new method for evaluating the fluid borne noise characteristics of positive displacement pumps. In the Seventh International Symposium on Fluid power, Bath, 1986, pp. 253–260.

16.

Edge

K. A.

Johnston

D. N.

The ‘secondary source’ method for the measurement of pump pressure ripple characteristics. Part 1: Description of method

Proc. Instn Mech. Engrs, Part A: J. Power and Energy, 1990, 204, 33–40.

17.

Edge

K. A.

Johnston

D. N.

The ‘secondary source’ method for the measurement of pump pressure ripple characteristics. Part 2: Experimental results

Proc. Instn Mech. Engrs, Part A: J. Power and Energy, 1990, 204, 41–46.

18.

BS 6335: 1983 Methods for determining pressure ripple levels generated in hydraulic fluid power systems and components. Part 1 - High impedance method for pumps, 1983 (British Standards Institution, London)

19.

Johnston

D. N.

Edge

K. A.

In-situ measurement of the wavespeed and bulk modulus in hydraulic lines

Proc. Instn Mech. Engrs, Part I: J. Systems and Control Engineering, 1991, 205, 191–197.

20.

Johnston

D. N.

Edge

K. A.

Measurement of positive displacement pump flow ripple and impedance

Proc. Instn Mech. Engrs, Part I: J. Systems and Control Engineering, 1991, 210, 65–74.

21.

Gamez-Montero

P. J.

Caracterizacion fluidodinamica de una bomba oleohidráulica de engranajes internos generados por perfiles trocoidales. PhD thesis, Technical University of Catalonia, 2004.

22.

De las Heras

Codina

Modelización de sistemas fluidos mediante bondgraph, 1997 (Cardellach Copies, Terrassa).